GE - General Electric NS16A48SA5 4-Ton 16 SEER2 User Manual

31-5000962 Rev. 0 02-25

NS16A

Air Conditioner R-454B

with Aluminum Coil

Service

Manual

READ CAREFULLY.

KEEP THESE INSTRUCTIONS

2 49-5000962 Rev. 0

This NS16A outdoor air conditioner with all-aluminum coil

is designed for use with R-454B refrigerant only. This unit

must be installed with an approved indoor air handler or coil.

These instructions are intended as a general guide and do

not supersede local codes in any way. Consult authorities

having jurisdiction before installation.

This outdoor unit is designed for use in systems that use the

following refrigerant metering device:

• Thermal expansion valve (TXV)

IMPORTANT: Special procedures are required for cleaning

the aluminum coil in this unit. See Page 30 in this manual

for information.

General Information

Improper installation, adjustment, alteration, service or

maintenance can cause property damage, personal injury

or loss of life. Installation and service must be performed

by a licensed professional installer (or equivalent), service

agency or the gas supplier.

WARNING

As with any mechanical equipment, contact with sharp

sheet metal edges can result in personal injury. Take

care while handling this equipment and wear gloves and

protective clothing.

CAUTION

Electric Shock Hazard. Can cause injury or

death. Unit must be properly grounded in

accordance with national and local codes.

Line voltage is present at all components

when unit is not in operation on units with

single-pole contactors. Disconnect all remote

electric power supplies before opening access

panel. Unit may have multiple power supplies.

WARNING

To prevent serious injury or death:

1. Lock-out/tag-out before performing maintenance.

2. If system power is required (e.g., smoke detector

maintenance), disable power to blower, remove fan

belt where applicable, and ensure all controllers

and thermostats are set to the “OFF” position before

performing maintenance.

3. Always keep hands, hair, clothing, jewelry, tools, etc.

away from moving parts.

WARNING

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IMPORTANT

49-5000962 Rev. 0 3

• Do not use means to accelerate the defrosting process

or to clean, other than those recommended by the

manufacturer.

• The appliance shall be stored in a room without

continuously operating ignition sources (for example:

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electric heater).

• Do not pierce or burn.

• Be aware that refrigerants may not contain an odor.

WARNING

Ducts connected to an appliance shall not contain a

potential ignition source

WARNING

PARTIAL UNITS shall only be connected to an appliance

suitable for the same refrigerant.

WARNING

Ensure that the area is in the open or that it is adequately

ventilated before breaking into the system or conducting

any hot work. A degree of ventilation shall continue during

the period that the work is carried out.

IMPORTANT

Verify cabling will not be subject to wear, corrosion,

excessive pressure, vibration, sharp edges or any other

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IMPORTANT

Pipe work, including piping material, pipe routing,

and installation shall include protection from physical

damage in operation and service, and be in compliance

with national and local codes and standards, such as

ASHRAE 15, ASHRAE 15.2, IAPMO Uniform Mechanical

Code, ICC International Mechanical Code, or CSA B52.

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being covered or enclosed.

IMPORTANT

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only be carried out by competent persons. This appliance

is not to be used by persons (including children) with

reduced physical, sensory or mental capabilities, or

lack of experience and knowledge, unless they have

been given supervision or instruction concerning use of

the appliance by a person responsible for their safety.

Children should be supervised to ensure they do not play

with the appliance.

WARNING

Servicing shall be performed only as recommended by

the manufacturer.

CAUTION

Some soaps used for leak detection are corrosive to

certain metals. Carefully rinse piping thoroughly after leak

test has been completed. Do not use matches, candles,

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CAUTION

Under no circumstances shall potential sources of ignition

be used in the searching for or detection of refrigerant

leaks. A halide torch (or any other detector using a naked

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The following leak detection methods are deemed

acceptable for all refrigerant systems.

Electronic leak detectors may be used to detect refrigerant

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sensitivity may not be adequate, or may need recalibration.

(Detection equipment shall be calibrated in a refrigerant-

free area.) Ensure that the detector is not a potential

source of ignition and is suitable for the refrigerant used.

Leak detection equipment shall be set at a percentage of

the LFL of the refrigerant and shall be calibrated to the

refrigerant employed, and the appropriate percentage of

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are also suitable for use with most refrigerants but the use

of detergents containing chlorine shall be avoided as the

chlorine may react with the refrigerant and corrode the

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shall be removed/extinguished. If a leakage of refrigerant

is found which requires brazing, all of the refrigerant shall

be recovered from the system, or isolated (by means of

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leak.

CAUTION

4 49-5000962 Rev. 0

When breaking into the refrigerant circuit to make repairs

– or for any other purpose – conventional procedures

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is important that best practice be followed and, since

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safely remove refrigerant following local and national

regulations, purging the circuit with inert gas, evacuating

(optional for A2L), purging with inert gas (optional for A2L),

or opening the circuit by cutting or brazing be adhered to.

The refrigerant charge shall be recovered into the correct

recovery cylinders if venting is not allowed by local and

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refrigerants, the system shall be purged with oxygen-

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refrigerants.

This process might need to be repeated several times.

Compressed air or oxygen shall not be used for purging

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refrigerants, refrigerants purging shall be achieved by

breaking the vacuum in the system with oxygenfree

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down to a vacuum (optional for A2L). This process shall be

repeated until no refrigerant is within the system (optional

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used, the system shall be vented down to atmospheric

pressure to enable work to take place. Ensure that the

outlet for the vacuum pump is not close to any potential

ignition sources and that ventilation is available.

IMPORTANT

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and then vacuum tested prior to refrigerant charging,

according to the following requirements;

– Field-made refrigerant joints indoors shall be tightness

tested. The test method shall have a sensitivity of .2

oz. per year of refrigerant or better, under pressure. No

leak shall be detected.

IMPORTANT

When removing refrigerant from a system, either for

servicing or decommissioning, it is recommended good

practice that all refrigerants are removed safely.

When transferring refrigerant into cylinders, ensure

that only appropriate refrigerant recovery cylinders are

employed. Ensure that the correct number of cylinders for

holding the total system charge is available. All cylinders

to be used are designated for the recovered refrigerant

and labelled for that refrigerant (i. e. special cylinders for

the recovery of refrigerant). Cylinders shall be complete

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in good working order. Empty recovery cylinders are

evacuated and, if possible, cooled before recovery

occurs.

The recovery equipment shall be in good working order

with a set of instructions concerning the equipment that

is at hand and shall be suitable for the recovery of all

appropriate refrigerants including, when applicable,

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weighing scales shall be available and in good working

order. Hoses shall be complete with leak-free disconnect

couplings and in good condition. Before using the recovery

machine, check that it is in satisfactory working order,

has been properly maintained and that any associated

electrical components are sealed to prevent ignition in the

event of a refrigerant release. Consult manufacturer if in

doubt.

The recovered refrigerant shall be returned to the

refrigerant supplier in the correct recovery cylinder,

and the relevant waste transfer note arranged. Do not

mix refrigerants in recovery units and especially not in

cylinders.

If compressors or compressor oils are to be removed,

ensure that they have been evacuated to an acceptable

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not remain within the lubricant. The evacuation process

shall be carried out prior to returning the compressor

to thesuppliers. Only electric heating to the compressor

body shall be employed to accelerate this process. When

oil is drained from a system, it shall be carried out safely.

IMPORTANT

In addition to conventional charging procedures, the

following requirements shall be followed.

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does not occur when using charging equipment. Hoses

or lines shall be as short as possible to minimize the

amount of refrigerant contained in them.

• Cylinders shall be kept in an appropriate position

according to the instructions.

• Ensure that the REFRIGERATING SYSTEM is earthed

prior to charging the system with refrigerant.

• Label the system when charging is complete (if not

already).

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REFRIGERATING SYSTEM.

Prior to recharging the system, it shall be pressuretested

with the appropriate purging gas. The system shall

be leak tested on completion of charging, but prior to

commissioning. A follow up leak test shall be carried out

prior to leaving the site.

IMPORTANT

49-5000962 Rev. 0 5

Prior to beginning work on systems containing

FLAMMABLE REFRIGERANTS, safety checks are

necessary to ensure that the risk of ignition is minimized.

IMPORTANT

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shall be instructed on the nature of work being carried

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IMPORTANT

If any hot work is to be conducted on the refrigerating

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extinguishing equipment shall be available to hand. Have

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charging area.

IMPORTANT

Sealed electrical components shall be replaced.

IMPORTANT

Intrinsically safe components must be replaced.

IMPORTANT

Work shall be undertaken under a controlled procedure

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being present while the work is being performed.

IMPORTANT

The area shall be checked with an appropriate refrigerant

detector prior to and during work, to ensure the technician

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Ensure that the leak detection equipment being used

is suitable for use with all applicable refrigerants, i.e.

nonsparking, adequately sealed or intrinsically safe.

IMPORTANT

No person carrying out work in relation to a

REFRIGERATING SYSTEM which involves exposing

any pipe work shall use any sources of ignition in such

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All possible ignition sources, including cigarette

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site of installation, repairing, removing and disposal,

during which refrigerant can possibly be released to the

surrounding space. Prior to work taking place, the area

around the equipment is to be surveyed to make sure

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Smoking” signs shall be displayed.

IMPORTANT

Where electrical components are being changed, they

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At all times the manufacturer’s maintenance and service

guidelines shall be followed. If in doubt, consult the

manufacturer’s technical department for assistance.

The following checks shall be applied to installations

using FLAMMABLE REFRIGERANTS:

– the actual REFRIGERANT CHARGE is in accordance

with the room size within which the refrigerant containing

parts are installed;

– the ventilation machinery and outlets are operating

adequately and are not obstructed;

– if an indirect refrigerating circuit is being used, the

secondary circuit shall be checked for the presence of

refrigerant;

– marking to the equipment continues to be visible and

legible. Markings and signs that are illegible shall be

corrected;

– refrigerating pipe or components are installed in a

position where they are unlikely to be exposed to any

substance which may corrode refrigerant containing

components, unless the components are constructed

of materials which are inherently resistant to being

corroded or are suitably protected against being so

corroded.

IMPORTANT

6 49-5000962 Rev. 0

NOTE – R-454B is an A2L refrigerant. The system installation must meet the following parameters based upon total

refrigerant charge (line set included). TAmin (Total minimum conditioned area) is the minimum allowable conditioned area

based upon the total system charge at sea level. Values must be multiplied by altitude adjustment factor at installed altitude.

Qmin table refers to minimum airflow requirements during refrigerant leak mitigation by the refrigerant detection system,

based upon total system charge.

See tables below.

Charge (lb) 10 15 20 25 30

Charge (kg) 4.5 6.8 9.1 11.3 13.6

Minimum Conditioned Area (ft2) 149.9 224.9 299.9 374.8 449.8

Minimum Conditioned Area (m2) 13.9 20.9 27.9 34.8 41.8

TAmin Table

NOTE – Multiply values in TAmin table by the Altitude Adjustment Factors to correct TAmin based on installed altitude.

Altitude (m) 0 200 400 600 800 1000 1200 1400 1600

Altitude (ft) 0 660 1310 1970 2620 3280 3940 4590 5250

Adj. Factor 1 1 1 1 1.02 1.05 1.04 1.1 1.12

Altitude (m) 1600 1800 2000 2200 2400 2600 2800 3000 3200

Altitude (ft) 5250 5910 6560 7220 7870 8530 9190 9840 10500

Adj. Factor 1.12 1.15 1.18 1.21 1.25 1.28 1.32 1.36 1.4

Altitude Adjustment Factor

Qmin Table

Refrigerant Charge lb (kg) CFM Required Refrigerant Charge lb (kg) CFM Required

5 (-2.3) 135 18 (-8.1) 487

6 (-2.7) 162 19 (-8.6) 514

7 (-3.2) 189 20 (-9.1) 541

8 (-3.6) 216 21 (-9.5) 568

9 (-4.1) 244 22 (-10) 595

10 (-4.5) 271 23 (-10.4) 622

11 (-5) 298 24 (-10.9) 649

12 (-5.4) 325 25 (-11.3) 676

13 (-5.9) 352 26 (-11.7) 704

14 (-6.4) 379 27 (-12.2) 731

15 (-6.8) 406 28 (-12.7) 758

16 (-7.3) 433 29 (-13.2) 785

17 (-7.7) 460 30 (-13.6) 812

MAJOR / MINOR

REVISION

REFRIGERANT

5 - R454B

VOLTAGE

A - 208/230 1PH 60HZ

DESIGN VARIANT

S - SPECIFIED

BRAND

N-GE

PRODUCT

S - SPLIT

SEER2

APPLICATION

A - AIR CONDITIONER

COOLING CAPACITY

(1000BTU/HR)

18, 24, 30, 36, 42, 48, 60

N S A – XX

A 24

S 5

Model Number Identification

49-5000962 Rev. 0 7

SPECIFICATIONS

Size 018 024 030 036

Nominal Tonnage 1.522.53

Sound Rating Number dBA 73 75 76

Connections (Sweat)

Liquid line (OD) - in. 3/8

Suction line (OD) - in. 3/4 7/8

Compressor Type 1-Stage Scroll

Refrigerant Type ¹ R-454B charge furnished 4 lbs. 14 oz. 5 lbs. 10 oz. 6 lbs. 13 oz.

Indoor Unit Expansion Valve (TXV) 26Z70

Outdoor Coil

Net face area - ft.²

Outer Coil 16.33 21.00 16.33 21.00

Inner Coil --- 15.75 20.25

Tube diameter - in. 5/16

Rows 1 2

Fins - in 26 22

Outdoor Fan

HP 1/8 1/6

Diameter - in. 22

Blades 2 3

Cfm 2610 2990 2820 3040

Rpm 825

Watts 160 190

Shipping Data - lbs. 155 170 180 200

ELECTRICAL DATA

Line voltage data (Volts-Phase-Hz) 208/230-1-60

² Maximum overcurrent protection (MOCP) amps (unit) 15 20 25 30

³ Minimum circuit ampacity (MCA) (unit) 11.2 13.6 16.6 21.8

Compressor

Rated load amps 8.3 10.3 12.7 16.7

Locked rotor amps 1.65 60.2 75.6 93.5

Fan Motor

Full load amps 0.74 1.0

Locked rotor amps 1.65 1.9

NOTE - Extremes of operating range are plus 10% and minus 5% of line voltage.

¹ Refrigerant charge is sufficient for 15 ft. length of refrigerant lines. For longer line set requirements see the Installation Instructions for information about line set length and additional refrigerant charge

required.

² HACR type breaker or fuse.

³ Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

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OPTIONAL CONTROLS - ORDER SEPARATELY

Accessory Part No. 018 024 030 036

Remote Outdoor Temperature Sensor X2658

OPTIONAL ACCESSORIES - ORDER SEPARATELY

Accessory Part No. 018 024 030 036

Compressor Crankcase Heater

Copeland 27V63

LG 27U16

Compressor Hard Start Kit

Copeland 63W22

Copeland 10J42

LG 10J42

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Compressor Sound Cover 18J42

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Freezestat - 3/8 in. 93G35

,QGRRU%ORZHU2ႇ'HOD\5HOD\ 58M81

Loss of Charge Switch Kit 84M23

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8QLW6WDQG2ႇ.LW 94J45

8 49-5000962 Rev. 0

SPECIFICATIONS

Size 042 048 060

Nominal Tonnage 3.5 4 5

Sound Rating Number dBA767880

Connections (Sweat)

Liquid line (OD) - in. 3/8

Suction line (OD) - in. 7/8 1-1/8

Compressor Type 1-Stage Scroll

Refrigerant Type ¹ R-454B charge furnished 7 lbs. 2 oz. 8 lbs. 14 oz.

Indoor Unit Expansion Valve (TXV) 26Z71 26Z72

Outdoor Coil

Net face area - ft.²

Outer coil 22.17 24.93 29.09

Inner coil 21.33 24.13 28.16

Tube diameter - in. 5/16

Rows 2

Fins - in 22

Outdoor Fan

HP 1/4

Diameter - in. 26 22 26

Blades 3 4

Cfm 4060 3700 4180

Rpm 825

Watts 260 290

Shipping Data - lbs. 225 235 260

ELECTRICAL DATA

Line voltage data (Volts-Phase-Hz) 208/230-1-60

² Maximum overcurrent protection (MOCP) amps (unit) 35 45 50

³ Minimum circuit ampacity (MCA) (unit) 23.2 29.7 31.2

Compressor

Rated load amps 17.3 22.4 23.7

Locked rotor amps 123 126 157

Fan Motor

Full load amps 1.56 1.7 1.56

Locked rotor amps 3.2

NOTE - Extremes of operating range are plus 10% and minus 5% of line voltage.

required.

² HACR type breaker or fuse.

³ Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

຾&UDQNFDVH+HDWHUDQG)UHH]HVWDWDUHUHFRPPHQGHGZLWK/RZ$PELHQW.LW

OPTIONAL CONTROLS - ORDER SEPARATELY

Accessory Part No. 042 048 060

Remote Outdoor Temperature Sensor X2658

OPTIONAL ACCESSORIES - ORDER SEPARATELY

Accessory Part No. 042 048 060

Compressor Hard Start Kit

Copeland 10J42

LG 10J42

LG 88M91

&RPSUHVVRU/RZ$PELHQW&XW2ႇ6ZLWFK 48F08

Compressor Sound Cover 18J42

&RPSUHVVRU7LPHG2ႇ&RQWURO 47J27

Freezestat - 3/8 in. 93G35

,QGRRU%ORZHU2ႇ'HOD\5HOD\ 58M81

Loss of Charge Switch Kit 84M23

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8QLW6WDQG2ႇ.LW 94J45

49-5000962 Rev. 0 9

Unit Dimensions – Inches (mm)

SUCTION AND

SIDE VIEW

DISCHARGE AIR

SIDE VIEW

LIQUID LINE

CONNECTION

OUTDOOR

COIL FAN

COMPRESSOR

OPTIONAL UNIT

STANDOFF KIT (4)

(FIELD INSTALLED)

4-3/8

INLET

AIR

INLET

AIR

TOP VIEW

INLET AIR

SUCTION LINE

CONNECTION

LIQUID LINE

CONNECTION

6-3/8

(162)

TOP VIEW BASE SECTION

COMPRESSOR

COIL DRAIN OUTLETS

(Around perimeter of base)

OPTIONAL UNIT

STAND-OFF KIT (4)

(Field Installed)

(111)

4-3/8

6-3/8

(162)

(111)

(111

()111)

4-3/8

(111)

2 (51)

3/4 (19)

2-3/4 (70)

ELECTRICAL

INLETS

Size A B C

In. mm in. mm in. mm

018 28-1/4 718 29-1/4 743 28-1/2 724

024 28-1/4 718 37-1/4 946 36-1/2 927

030 28-1/4 718 29-1/4 743 28-1/2 724

036 28-1/4 718 37-1/4 946 36-1/2 927

042 32-1/4 819 33-1/4 845 32-1/2 826

048 28-1/4 718 43-1/4 1099 42-1/2 1080

060 32-1/4 819 43-1/4 1099 42-1/2 1080

10 49-5000962 Rev. 0

Typical Unit Parts Arrangement

FIELD CONNECTION

FOR LIQUID LINE SET

LIQUID LINE

SERVICE VALVE

LIQUID LINE

SERVICE VALVE

PORT

SUCTION LINE

SERVICE VALVE

PORT

SUCTION LINE

SERVICE VALVE

FIELD CONNECTION

FOR SUCTION LINE

HIGH PRESSURE

SWITCH (S4)

COMPRESSOR

HARNESS

GROUND LUG

CONTACTOR 1-POLE (K1-1)

CAPACITOR (C12)

CONTROL BOX

TYPICAL PLUMBING

(COPELAND COMPRESSOR)

TYPICAL PLUMBING

(LG COMPRESSOR)

HIGH PRESSURE

SWITCH (S4)

FIELD CONNECTION

FOR LIQUID LINE SET

LIQUID LINE

SERVICE VALVE

LIQUID LINE

SERVICE VALVE

PORT

FIELD CONNECTION

FOR SUCTION LINE

SUCTION LINE

SERVICE VALVE

SUCTION LINE

SERVICE VALVE

PORT

COMPRESSOR

HARNESS

LOW PRESSURE

SWITCH

LOW PRESSURE

SWITCH

FIGURE 1.

49-5000962 Rev. 0 11

Component Specifications

Refrigerant Metering Device – Indoor Coil

Operating Gauge Set and Service Valves

TABLE 1. Service Valve Sizes and Refrigerant Line Set Recommendations

Model

Service Valve Sizes Recommended Line Set

Liquid Line Suction Line Liquid Line Suction Line

-018, -024, -030

3/8 in. (10 mm)

3/4 in. (19 mm)

3/8 in. (10 mm)

3/4 in. (19 mm)

-036, -042, -048 7/8 in. (22 mm) 7/8 in. (22 mm)

-059, -060 1-1/8 in. (22 mm) 1-1/8 in. (22 mm)

NOTE — Some applications may require a field provided 7/8” to 1-1/8” adapter

EXPANSION VALVE (TXV) METERING

This unit is compatible with systems that use an expansion

valve. Refer to any of the publications listed below to obtain

the required catalog number for a specific expansion valve.

• NS16A Product Specifications

TORQUE REQUIREMENTS

When servicing or repairing heating, ventilating, and

air conditioning components, ensure the fasteners are

appropriately tightened. TABLE 2 lists torque values for

fasteners.

USING MANIFOLD GAUGE SET

When checking the system charge, only use a manifold

gauge set that features low loss anti-blow back fittings.

Manifold gauge set used with R-454B refrigerant systems

must be capable of handling the higher system operating

pressures. The gauges should be rated for use with

pressures of 0 - 800 psig on the high side and a low side of

30” vacuum to 250 psig with dampened speed to 500 psi.

Gauge hoses must be rated for use at up to 800 psig of

pressure with a 4000 psig burst rating.

OPERATING SERVICE VALVES

The liquid and vapor line service valves are used for

removing refrigerant, flushing, leak testing, evacuating,

checking charge and charging. Each valve is equipped

with a service port which has a factory-installed valve stem.

FIGURE 2 provides information on access and operation of

both angle and ball service valves.

The Clean Air Act of 1990 bans the intentional venting of

refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.

Approved methods of recovery, recycling or reclaiming

must be followed. Fines and/or incarceration may be

levied for noncompliance.

IMPORTANT

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- Rockwell Harness Scale minimum). Fully insert the

wrench into the valve stem recess.

Service valve stems are factory-torqued (from 9 ft-lbs

for small valves, to 25 ft-lbs for large valves) to prevent

refrigerant loss during shipping and handling. Using an

Allen wrench rated at less than 50Rc risks rounding

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recess.

IMPORTANT

To prevent stripping of the various caps used, the

DSSURSULDWHO\ VL]HG ZUHQFK VKRXOG EH XVHG DQG ¿WWHG

snugly over the cap before tightening.

IMPORTANT

TABLE 2. Torque Requirements

Parts Recommended Torque

Service valve cap 8 ft.- lb. 11 NM

Sheet metal screws 16 ft.- lb. 2 NM

Machine screws #10 28 ft.- lb. 3 NM

Compressor bolts 90 in.- lb. 10 NM

Gauge port seal cap 8 ft.- lb. 11 NM

12 49-5000962 Rev. 0

SERVICE VALVES ANGLE AND BALL

FIGURE 2. Angle and Ball Service Valves

Operating Angle Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

2. Use a service wrench with a hex-head extension (3/16” for liquid line valve sizes and 5/16” for vapor line valve sizes) to back the stem out

counterclockwise as far as it will go.

Operating Ball Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

2. Use an appropriately sized wrenched to open.

– To open valve, roate stem counterclockwise 90°.

– To close valve, rotate stem clockwise 90°.

To Access Service Port:

1. Remove service port cap with an appropriately sized wrench.

2. Connect gauge set to service port.

3. When testing is completed, replace service

port cap and tighten as follows:

• With torque wrench: Finger tighten and

torque cap per Table 2.

• Without torque wrench: Finger tighten and

use an appropriately sized wrench to turn an

additional 1/6 turn clockwise.

Reinstall Stem Cap:

Stem cap protects the valve stem from

damage and serves as the primary seal.

Replace the stem cap and tighten as follows:

• With Torque Wrench: Finger tighten and

then torque cap per Table 2.

• Without Torque Wrench: Finger tighten

and use an appropriately sized wrench to

turn an additional 1/12 turn clockwise.

ANGLE-TYPE SERVICE VALVE

(BACK-SEATED OPENED)

When service valve is OPEN, the service port

is open to linE set, indoor and outdoor unit.

ANGLE-TYPE SERVICE VALVE

(FRONT-SEATED CLOSED)

When service valve is CLOSED, the service

port is open to the linE set and indoor unit.

Service Port Core

To Outdoor Unit

Stem Cap

Service Port Cap

To Indoor Unit

(Valve Stem Shown Open)

Insert Hex Wrench Here

(Valve Stem Shown Closed)

Insert Hex Wrench Here

1/6 TURN

Ball (Shown

Closed)

Service Port Core

To Indoor Unit

To Outdoor Unit

To OPEN, rotate stem

counterclockwise 90°.

To CLOSE, rotate stem

clockwise 90°.

Service Port

Service Port Cap

Stem Cap

Valve

Stem

1/12 TURN

NOTE — A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.

49-5000962 Rev. 0 13

Installation

Unit Placement

See Unit Dimensions on Page 9 for sizing mounting slab,

platforms or supports.

POSITIONING CONSIDERATIONS

Consider the following when positioning the unit:

• Some localities are adopting sound ordinances based on

the unit’s sound level registered from the adjacent property,

not from the installation property. Install the unit as far as

possible from the property line.

• When possible, do not install the unit directly outside a

window. Glass has a very high level of sound transmission.

For proper placement of unit in relation to a window see the

provided illustration in FIGURE 4, detail A.

PLACING UNIT ON SLAB

When installing unit at grade level, the top of the slab

should be high enough above grade so that water from

higher ground will not collect around the unit.

The slab should have a slope tolerance as described in

FIGURE 4, detail B.

NOTE – If necessary for stability, anchor unit to slab.

ROOF MOUNTING

Install the unit a minimum of 6 inches (152 mm) above the

roof surface to avoid ice build-up around the unit. Locate the

unit above a load bearing wall or area of the roof that can

adequately support the unit. Consult local codes for rooftop

applications. If unit coil cannot be mounted away from

prevailing winter winds, a wind barrier should be constructed.

Size barrier at least the same height and width as outdoor

unit. Mount barrier 24 inches (610 mm) from the sides of the

unit in the direction of prevailing winds.

In order to avoid injury, take proper precaution when

lifting heavy objects.

CAUTION

Roof Damage!

This system contains both refrigerant and oil. Some

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cause leaks. Protect the roof surface to avoid exposure to

refrigerant and oil during service and installation. Failure

to follow this notice could result in damage to roof surface.

NOTICE

NOTES -

• Service clearance of 30 in. (762 mm) must be maintained on one of the sides

adjacent to the control box.

• Clearance to one of the other three sides must be 36 in. (914 mm).

• Clearance to one of the remaining two sides may be 12 in. (305 mm) and the final

side may be 6 in. (152 mm).

• A clearance of 24 in. must be maintained between two units.

• 48 in. (1219 mm) clearance required on top of unit.

NOTICE: Specific applications may require adjustment of the listed installation clearances to provide protection for

the unit from physical damage or to avoid conditions which limit operating efficiency. (Example: Clearances may have

to be increased to prevent snow or ice from falling on the top of the unit. Additional clearances may also be required

to prevent air recirculation when the unit is installed under a deck or in another tight space.)

See

NOTES

See NOTES

See

NOTES

Control

Box

FIGURE 3. Installation Clearances

14 49-5000962 Rev. 0

FIGURE 4. Placement and Slab Mounting

DETAIL A DETAIL B

Install unit level or, if on a slope, maintain slope tolerance

of 2 degrees (or 2 inches per 5 feet [50 mm per 1.5 m])

away from building structure.

Ground Level

Mounting Slab

Building

Structure

Discharge Air

Install unit away

from windows

Two 90º elbows installed in line set

will reduce line set vibration.

49-5000962 Rev. 0 15

Removing and Installing Louvered Panels

To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following:

While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause

injury to personnel, nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g.,

being bent or scratched). While handling or stowing the panels, consider any weather conditions, especially windy

conditions, that may cause panels to be blown around and battered.

WARNING

Line Set Joints – Furnace Application

Evaporator primary line set joints in all applications shall

have a line set joint sleeve.

Evaporator primary line sets should not have additional

joints not covered by line set joint sleeve.

If additional joints are present, the system installation

shall comply with one of the options below:

Option 1 - Furnace is installed as a direct vent appliance;

Option 2 - Furnace/Evaporator installation is in a space

greater than the minimum conditioned area (Amin);

Option 3 - Furnace/Evaporator installation is connected to

a space greater than the minimum conditioned area (Amin)

through an opening of at least 15 in² (4-inch diameter hole

equivalent) located below the level of the furnace burners;

Option 4 - Have a second refrigerant detection sensor

installed below the level of the burners (see Secondary

Sensor Installation section).

Multiple Systems Installed in Same Space

For any A2L refrigerant system with additional joints not

covered by line set joint sleeves, each system in the same

space must have refrigerant detection sensor installed below

the level of the burners (see Secondary Sensor Installation

section). If all the systems in the same space are installed

with direct vent application, then additional refrigerant

detection sensor is not needed

FIGURE 5. Removing and Installing Panels

WARNING

PANEL A

PANEL B

PANEL C

PANEL D

When removing the unit panels. Remove panel A first, then B, C and

finally D. When reinstalling panels, reverse that order starting with panel

D, C, B and finally A.

REMOVAL

Repeat steps 1, 2 and 3

to remove panels B, C

and D.

STEP 1

Starting with panel D. Insert

panel unit unit top cap lip and

lift slightly to clear side lip of

panel from base.

PANEL A

STEP 2

INSTALLATION

Repeat steps 1 and 2 when

installing panels C, B and A.

To remove panel,

remove mounting

screws securing panel

to the unit.

Slightly lift panel A in order

to clear side lips of panel

from base of unit.

STEP 3

Tilt panel out slightly and

pull downward to remove.

STEP 1

STEP 2

Move panel in towards unit. Align

left / right side lips of panel with

groove inserts along left / right

side of unit.

PANEL D

TOP CAP

BASE

SIDE

GROOVE

STEP 3

Secure panel with mounting screws.

16 49-5000962 Rev. 0

Secondary Sensor Installation

If secondary refrigerant sensor is required, it shall be

mounted as follows:

Upflow Applications: Mounted on an unused side furnace

return air connection at least 9 inches above the floor and

within 9 inches from front of furnace.

Downflow Applications: Mounted on one side of the

evaporator coil 9 inches above the floor and within 9 inches

from front of coil.

Horizontal Applications: Mounted on the bottom side

return furnace air connection within 9 inches of both the

blower deck and front of furnace.

Connect the refrigerant sensor to the second sensor input on

the RDS Control. Refer to the instructions provided with the

sensor or the RDS controller to enable the second sensor.

New or Replacement Line Set

This section provides information on new installation or

replacement of existing line set. If a new or replacement line

set is not required, then proceed to Brazing Connections on

Page 19.

Field refrigerant piping consists of liquid and suction lines

from the outdoor unit (braze connections) to the indoor

unit coil (flare or braze connections). Use readily available

(braze, non-flare) series line set, or use field-fabricated

refrigerant lines as listed in TABLE 3.

To obtain the correct information from GE Appliances, be

sure to communicate the following points:

• Model (NS16A) and size of unit (e.g. -060).

• Line set diameters for the unit being installed as listed in

TABLE 1 and total length of installation.

• Number of elbows and if there is a rise or drop of the piping.

If refrigerant lines are routed through a wall, seal and isolate

the opening so vibration is not transmitted to the building.

Pay close attention to line set isolation during installation

of any HVAC system. When properly isolated from building

structures (walls, ceilings. floors), the refrigerant lines will

not create unnecessary vibration and subsequent sounds.

The compressor is charged with sufficient Polyol ester oil

for line set lengths up to 50 feet. Recommend adding oil

to system based on the amount of refrigerant charge in the

system. No need to add oil in a system with 20 pounds of

refrigerant or less. For systems over 20 pounds - add one

ounce for every five pounds of refrigerant over 20 pounds.

Recommended topping-off POE oils are Mobil EAL ARCTIC

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REFRIGERANT LINE SET – INCHES (MM)

Model

Valve Field Connections Recommended Line Set

Liquid Line Vapor Line Liquid Line Vapor Line

-036

3/8 in.

(10 mm)

7/8 in.

(22 mm)

3/8 in.

(10 mm)

7/8 in.

(22 mm)

-042

-048

-060

3/8 in.

(10 mm)

1-1/8 in.

(28 mm)

3/8 in.

(10 mm)

1-1/8 in.

(28 mm)

NOTE - Some applications may require a field-provided 7/8” to 1-1/8”

adapter.

NOTE - When installing refrigerant lines longer than 50

feet, refer to the Refrigerant Piping Design and Fabrication

Guidelines manual available on GEApliances.com,

or contact the Technical Support Department Product

Application group for assistance.

Refrigerant can be harmful if it is inhaled. Refrigerant

must be used and recovered responsibly. Failure to follow

this warning may result in personal injury or death.

WARNING

When using a high pressure gas such as

nitrogen to pressurize a refrigeration or air

conditioning system, use a regulator that can

control the pressure down to 1 or 2 psig (6.9

to 13.8 kPa).

WARNING

Fire, Explosion and Personal Safety hazard.

Failure to follow this warning could result in

damage, personal injury or death.

Never use oxygen to pressurize or purge

refrigeration lines. Oxygen, when exposed

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or an explosion, that could result in property

damage, personal injury or death.

WARNING

TABLE 3

49-5000962 Rev. 0 17

LIQUID LINE FILTER DRIER INSTALLATION

The provided filter drier must be field installed outdoors in

the liquid line between the units liquid line service valve

and before the liquid line enters the structure. It is not

recommended to install the liquid line filter drier indoors due

to additional braze joints required. This filter drier must be

installed to ensure a clean, moisture-free system. Failure to

install the filter drier will void the warranty. A replacement

filter drier is available from GE Appliances. See Brazing

Connections on Page 19 for special procedures on brazing

filter drier connections to the liquid line.

OUTDOOR

UNIT

LIQUID LINE

SERVICE VALVE

LIQUID LINE

FILTER DRIER

LINE

LIQUID

LINE

BRAZE CONNECTION POINTS

FIGURE 6. Typical Liquid Line Filter Drier Installation

18 49-5000962 Rev. 0

FIGURE 7. Line Set Installation

ANCHORED HEAVY NYLON

WIRE TIE OR AUTOMOTIVE

MUFFLER‐TYPE HANGER

STRAP LIQUID LINE TO

VAPOR LINE

WALL

STUD

LIQUID LINE

NON-CORROSIVE

METAL SLEEVE

VAPOR LINE - WRAPPED

IN ARMAFLEX

AUTOMOTIVE

MUFFLER‐TYPE HANGER

REFRIGERANT LINE SET — TRANSITION

FROM VERTICAL TO HORIZONTAL

Line Set Isolation — The following illustrations are

examples of proper refrigerant line set isolation:

STRAPPING

MATERIAL (AROUND

VAPOR LINE ONLY)

TAPE OR

WIRE TIE

WIRE TIE (AROUND

VAPOR LINE ONLY)

FLOOR JOIST OR

ROOF RAFTER

TAPE OR

WIRE TIE

To hang line set from joist or rafter, use either metal strapping material

or anchored heavy nylon wire ties.

8 FEET (2.43 METERS)

STRAP THE VAPOR LINE TO THE JOIST

OR RAFTER AT 8 FEET (2.43 METERS)

INTERVALS THEN STRAP THE LIQUID

LINE TO THE VAPOR LINE.

FLOOR JOIST OR

ROOF RAFTER

REFRIGERANT LINE SET — INSTALLING

HORIZONTAL RUNS

NOTE — Similar installation practices should be used if line set is

to be installed on exterior of outside wall.

PVC

PIPE

FIBERGLASS

INSULATION

CAULK

OUTSIDE

WALL

VAPOR LINE WRAPPED

WITH ARMAFLEX

LIQUID

LINE

OUTSIDE WALL

LIQUID LINE

VAPOR LINE

WOOD BLOCK

BETWEEN STUDS

STRAP

WOOD BLOCK

STRAP

SLEEVE

WIRE TIE

INSIDE WALL

REFRIGERANT LINE SET — INSTALLING

VERTICAL RUNS (NEW CONSTRUCTION SHOWN)

INSTALLATION

LINE SET

NOTE — Insulate liquid line when it is routed through areas where the

surrounding ambient temperature could become higher than the

temperature of the liquid line or when pressure drop is equal to or greater

than 20 psig.

NON-CORROSIVE

METAL SLEEVE

IMPORTANT — Refrigerant lines must not contact structure.

NON-CORROSIVE

METAL SLEEVE

8 FEET (2.43 METERS)

IMPORTANT — Refrigerant lines must not contact wall

WARNING — Polyol ester (POE) oils used with R-454B

refrigerant absorb moisture very quickly. It is very important that the

refrigerant system be kept closed as much as possible. DO NOT

remove line set caps or service valve stub caps until you are ready

to make connections.

49-5000962 Rev. 0 19

Brazing Connections

Use the procedures outlined in FIGURE 8 and FIGURE 9 for

brazing line set connections to service valves.

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hazardous to your health.

Avoid breathing vapors or fumes from brazing operations.

Perform operations only in well-ventilated areas.

Wear gloves and protective goggles or face shield to

protect against burns.

Wash hands with soap and water after handling brazing

DOOR\VDQGÀX[

CAUTION

If this unit is being matched with an approved line set, it

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all existing traps. Polyol ester (POE) oils are used in

GE Appliances units charged with R-454B refrigerant.

Residual mineral oil can act as an insulator, preventing

proper heat transfer. It can also clog the expansion device

and reduce system performance and capacity.

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and the detailed Installation and Service Procedures

manual will void the warranty.

IMPORTANT

Allow braze joint to cool before removing the wet rag

from the service valve. Temperatures above 250ºF can

damage valve seals.

IMPORTANT

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14903 (latest edition).

IMPORTANT

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charge from only the high side may result

in pressurization of the low side shell and

suction tubing. Application of a brazing torch

to a pressurized system may result in ignition

of the refrigerant and oil mixture. Check the

high and low pressures before applying heat.

WARNING

Use silver alloy brazing rods with 5% minimum silver alloy

for copper-to-copper brazing. Use 45% minimum alloy for

copper-to-brass and copper-to-steel brazing.

IMPORTANT

20 49-5000962 Rev. 0

FIGURE 8. Brazing Procedures

ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE

VALVES

OUTDOOR

UNIT

LIQUID LINE

VAPOR LINE

LIQUID LINE SERVICE

VALVE

SUCTION /

VAPOR LINE

SERVICE

VALVE

ATTACH

GAUGES

INDOOR

UNIT

SUCTION / VAPOR SERVICE PORT MUST BE

OPEN TO ALLOW EXIT POINT FOR NITROGEN

A Connect gauge set low pressure side to

liquid line service valve (service port).

B Connect gauge set center port to bottle of

nitrogen with regulator.

C Remove core from valve in suction / vapor

line service port to allow nitrogen to escape.

NITROGEN

HIGHLOW

USE REGULATOR TO FLOW

NITROGEN AT 1 TO 2 PSIG.

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

Flow regulated nitrogen (at 1 to 2 psig) through the low-side refrigeration gauge set into the liquid line service port valve, and out of the suction /

vapor line service port valve.

CUT AND DEBUR

CAP AND CORE REMOVAL

Cut ends of the refrigerant lines square (free from nicks or dents)

and debur the ends. The pipe must remain round. Do not crimp end

of the line.

Remove service cap and core from

both the suction / vapor and liquid line

service ports.

LIQUID LINE SERVICE

VALVE

SERVICE

PORT

CORE

SERVICE PORT

CAP

SERVICE

PORT

CORE

SERVICE

PORT CAP

CUT AND DEBUR

LINE SET SIZE MATCHES

SERVICE VALVE CONNECTION

COPPER TUBE

STUB

SERVICE VALVE

CONNECTION

REFRIGERANT LINE

DO NOT CRIMP SERVICE VALVE

CONNECTOR WHEN PIPE IS

SMALLER THAN CONNECTION

REDUCER

SUCTION / VAPOR LINE

SERVICE VALVE

LINE SET SIZE IS SMALLER

THAN CONNECTION

49-5000962 Rev. 0 21

FIGURE 9. Brazing Procedures (Cont’d)

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

LIQUID LINE SERVICE VALVE

LIQUID LINE

BRAZE LINE SET

Wrap both service valves with water-saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Cloths

must remain water-saturated throughout the brazing and cool-down process.

WATER-SATURATED

CLOTH

IMPORTANT - Allow braze joint to cool. Apply additional

water-saturated cloths to help cool brazed joint. Do not

remove water-saturated cloths until piping has cooled.

Temperatures above 250ºF will damage valve seals.

SUCTION LINE

WATER-SATURATED

CLOTH

SUCTION LINE SERVICE

VALVE

Disconnect manifold gauge set from service ports after all connections have been brazed. Apply additional water-saturated cloths to both

service valves to cool piping. Once piping is cool, remove all water-saturated cloths.

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

PREPARATION FOR NEXT STEP

WRAP SERVICE VALVES

To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use

additional water-saturated cloths underneath the valve body to protect the base paint.

FLOW NITROGEN

Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve

and out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections.

WARNING

FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE

may result if you do not wrap a water-saturated cloth

around both liquid and suction line service valve bodies

and copper tube stub while brazing the line set! The braze,

when complete, must be quenched with water to absorb

any residual heat.

Do not open service valves until refrigerant lines and

indoor coil have been leak-tested and evacuated.

Refer to Installation manual.

22 49-5000962 Rev. 0

Flushing Line Set and Indoor Coil

FIGURE 10. Removing Metering Device and Flushing

LOW HIGH

EXISTING

INDOOR

UNIT

GAUGE

MANIFOLD

INVERTED CYLINDER

CONTAINS CLEAN

HCFC22* TO BE USED

FOR FLUSHING.

LIQUID LINE SERVICE

VALVE

INLET

DISCHARGE

TANK

RETURN

CLOSED

OPENED

RECOVERY CYLINDER

RECOVERY MACHINE

NEW

OUTDOOR

UNIT

VAPOR LINE

SERVICE VALVE

VAPOR

LIQUID

A Inverted HCFC-22 cylinder with clean refrigerant* to the vapor service

valve.

B HCFC-22 gauge set (low side) to the liquid line valve.

C HCFC-22 gauge set center port to inlet on the recovery machine with an

empty recovery tank to the gauge set.

D Connect recovery tank to recovery machines per machine instructions.

CONNECT GAUGES AND EQUIPMENT FOR

FLUSHING PROCEDURE

FLUSHING LINE SET

A Set the recovery machine for liquid recovery and start the

recovery machine. Open the gauge set valves to allow the

recovery machine to pull a vacuum on the existing system line

set and indoor unit coil.

B Invert the cylinder of clean HCFC-22* and open its valve to allow

liquid refrigerant to flow into the system through the vapor line

valve. Allow the refrigerant to pass from the cylinder and through

the line set and the indoor unit coil before it enters the recovery

machine.

C After all of the liquid refrigerant has been recovered, switch the

recovery machine to vapor recovery so that all of the HCFC-22

vapor is recovered. Allow the recovery machine to pull the

system down to 0.

D Close the valve on the inverted HCFC-22 drum and the gauge

set valves. Pump the remaining refrigerant out of the recovery

machine and turn the machine off.

The line set and indoor unit coil must be flushed with at least the

same amount of clean refrigerant* that previously charged the

system. Check the charge in the flushing cylinder before

proceeding.

SENSING

LINE

TYPICAL EXISTING EXPANSION VALVE REMOVAL

PROCEDURE (UNCASED COIL SHOWN)

TWO PIECE PATCH PLATE

(UNCASED COIL ONLY)

VAPOR

LINE

DISTRIBUTOR

ASSEMBLY

DISTRIBUTOR

TUBES

LIQUID

LINE

MALE EQUALIZER

LINE FITTING

EQUALIZER

LINE

CHECK

EXPANSION

VALVE

TEFLON

RING

STUB END

TEFLON

RING

SENSING BULB

LIQUID LINE

ORIFICE

HOUSING

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

A On fully cased coils, remove the coil access and plumbing panels.

B Remove any shipping clamps holding the liquid line and distributor

assembly.

C Disconnect the equalizer line from the check expansion valve

equalizer line fitting on the vapor line.

D Remove the vapor line sensing bulb.

E Disconnect the liquid line from the check expansion valve at the liquid

line assembly.

F Disconnect the check expansion valve from the liquid line orifice

housing. Take care not to twist or damage distributor tubes during this

process.

G Remove and discard check expansion valve and the two Teflon

rings.

H Use a field-provided fitting to temporary reconnect the liquid line to the

indoor unit's liquid line orifice housing.

*IMPORTANT - Clean refrigerant is any refrigerant in a system that has not had compressor burn out. If the system

has experienced burn out, it is recommended that the existing line set and indoor coil be replaced.

49-5000962 Rev. 0 23

Installing Indoor Metering Device

This outdoor unit is designed for use in systems that use an

expansion valve metering device (purchased separately) at

the indoor coil. See the NS16A Product Specifications for

approved expansion valve kit match ups.

The expansion valve unit must be installed inside the

cabinet. In applications where an uncased coil is being

installed in a field-provided plenum, install the expansion

valve in a manner that will provide access for field servicing

of the expansion valve. Refer to below illustration for

reference during installation of expansion valve unit.

FIGURE 11.

A Attach the vapor line sensing bulb in the proper

orientation as illustrated to the right using the clamp and

screws provided.

NOTE — Confirm proper thermal contact between vapor line

and expansion bulb before insulating the sensing bulb once

installed.

B Connect the equalizer line from the expansion valve to

the equalizer vapor port on the vapor line. Finger tighten

the flare nut plus 1/8 turn (7 ft-lbs) as illustrated below.

TWO PIECE

PATCH PLATE

(UNCASED

COIL ONLY)

VAPOR

LINE

LIQUID LINE

ORIFICE

HOUSING

DISTRIBUTOR

TUBES

LIQUID LINE

MALE EQUALIZER LINE

FITTING (SEE

EQUALIZER LINE

INSTALLATION FOR

FURTHER DETAILS)

SENSING

LINE

EQUALIZER

LINE

EXPANSION

VALVE

TEFLON

RING

(Uncased Coil Shown)

Sensing bulb insulation is required if

mounted external to the coil casing. See

sensing bulb installation for bulb positioning.

STUB

END

TEFLON

RING

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

DISTRIBUTOR

ASSEMBLY

A Remove the field-provided fitting that temporary

reconnected the liquid line to the indoor unit's distributor

assembly.

B Install one of the provided Teflon

rings around the

stubbed end of the expansion valve and lightly lubricate

the connector threads and expose surface of the Teflon

ring with refrigerant oil.

C Attach the stubbed end of the expansion valve to the

liquid line orifice housing. Finger tighten and use an

appropriately sized wrench to turn an additional 1/2 turn

clockwise as illustrated in the figure above, or 20 ft-lb.

D Place the remaining Teflon

washer around the other

end of the expansion valve. Lightly lubricate connector

threads and expose surface of the Teflon

ring with

refrigerant oil.

E Attach the liquid line assembly to the expansion valve.

Finger tighten and use an appropriately sized wrench to

turn an additional 1/2 turn clockwise as illustrated in the

figure above or 20 ft-lb.

ON 7/8” AND LARGER LINES,

MOUNT SENSING BULB AT

EITHER THE 4 OR 8 O'CLOCK

POSITION. NEVER MOUNT ON

BOTTOM OF LINE.

ON LINES SMALLER THAN

7/8”, MOUNT SENSING

BULB BETWEEN THE 3 AND

9 O'CLOCK POSITIONS.

BULB

VAPOR LINE

NOTE — NEVER MOUNT ON BOTTOM OF LINE.

BULB

VAPOR LINE

FLARE NUT

COPPER FLARE

SEAL BONNET

MALE BRASS EQUALIZER

LINE FITTING

FLARE SEAL CAP

1/2 Turn

SENSING BULB INSTALLATION

EQUALIZER LINE INSTALLATION

1/8 Turn

A Remove and discard either the flare seal cap or flare nut

with copper flare seal bonnet from the equalizer line port

on the vapor line as illustrated in the figure to the right.

B Remove and discard either the flare seal cap or flare nut

with copper flare seal bonnet from the equalizer line port on

the vapor line as illustrated in the figure to the right.

INDOOR EXPANSION VALVE INSTALLATION

9 O'CLOCK TO

3 O'CLOCK

24 49-5000962 Rev. 0

Leak Testing the System

Leak detector must be capable of sensing A2L refrigerant.

IMPORTANT

The Environmental Protection Agency (EPA) prohibits

the intentional venting of HFC refrigerants during

maintenance, service, repair and disposal of appliance.

Approved methods of recovery, recycling or reclaiming

must be followed.

IMPORTANT

FIGURE 12. System Leak Test

TO VAPOR

SERVICE VALVE

R-454B

MANIFOLD GAUGE SET

OUTDOOR UNIT

HIGH

LOW

NITROGEN

NOTE - Position

canister to deliver

liquid refrigerant.

A - With both manifold valves closed, connect the cylinder of R-454B refrigerant to the center port of the

manifold gauge set. Open the valve on the R-454B cylinder (vapor only).

B -Open the high pressure side of the manifold to allow R-454B into the line set and indoor unit. Weigh in

a trace amount of R-454B. [A trace amount is a maximum of two ounces (57 g) refrigerant or three

pounds (31 kPa) pressure.] Close the valve on the R-454B cylinder and the valve on the high

pressure side of the manifold gauge set. Disconnect the R-454B cylinder.

C -Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gauge

set.

D -Adjust nitrogen pressure to 160 psig (1103 kPa). Open the valve on the high side of the manifold gauge set

in order to pressurize the line set and the indoor unit.

E - After a few minutes, open one of the service valve ports and verify that the refrigerant added to the

system earlier is measurable with a leak detector. Once leak detector is confirmed operational, leak

check the entire system (field joints and line set included) to a sensitivity of 5 grams per year of

refrigerant.

F - After leak testing, disconnect gauges from service ports.

After the line set has been connected to the indoor and outdoor units, check the line set connections and

indoor unit for leaks. Use the following procedure to test for leaks:

A - Connect the high pressure hose of an R-454B manifold gauge set to the vapor valve service port.

NOTE - Normally, the high pressure hose is connected to the liquid line port. However, connecting it

to the vapor port better protects the manifold gauge set from high pressure damage.

B -With both manifold valves closed, connect the cylinder of R-454B refrigerant to the center port of

the manifold gauge set.

CONNECT GAUGE SET

TEST FOR LEAKS

NOTE - Later in the procedure, the R-454B container will be replaced by the nitrogen container.

LEAK TEST

49-5000962 Rev. 0 25

Evacuating Line Set and Indoor Coil

FIGURE 13. Evacuating the System

A - Open both manifold valves and start the vacuum pump.

B - Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).

NOTE - During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure

indicates a relatively large leak. If this occurs, repeat the leak testing procedure.

NOTE - The term absolute pressure means the total actual pressure above absolute zero within a given volume or system. Absolute

pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.

C - When the absolute pressure reaches 23,000 microns (29.01 inches of

mercury), perform the following:

Close manifold gauge valves.

Close valve on vacuum pump.

Turn off vacuum pump.

Disconnect manifold gauge center port hose from vacuum pump.

Attach manifold center port hose to a nitrogen cylinder with pressure

regulator set to 160 psig (1103 kPa) and purge the hose.

Open manifold gauge valves to break the vacuum in the line set and indoor

unit.

Close manifold gauge valves.

D - Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the

nitrogen from the line set and indoor unit.

E - Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the

absolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20-minute period after shutting off the vacuum pump

and closing the manifold gauge valves.

F - When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to a

cylinder of R-454B positioned to deliver liquid refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the

line set and indoor unit.

G - Perform the following:

Close manifold gauge valves.

Shut off R-454B cylinder.

Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core

tool while maintaining a positive system pressure.

Replace stem caps and finger tighten them, then tighten an additional one-sixth (1/6) of a turn as illustrated.

OUTDOOR

UNIT

TO VAPOR

SERVICE VALVE

TO LIQUID LINE

SERVICE VALVE

MICRON

GAUGE

VACUUM PUMP

1/4 SAE TEE WITH SWIVEL

COUPLER

500

MANIFOLD

GAUGE SET

R-454B

RECOMMEND

MINIMUM 3/8” HOSE

A - Connect low side of manifold gauge set with

1/4 SAE in-line tee to vapor line service valve

B - Connect high side of manifold gauge set to

liquid line service valve

C - Connect available micron gauge connector

on the 1/4 SAE in-line tee.

D - Connect the vacuum pump (with vacuum

gauge) to the center port of the manifold

gauge set. The center port line will be used

later for both the R-454B and nitrogen

containers.

HIGH

LOW

1/6 TURN

NITROGEN

CONNECT GAUGE SET

EVACUATE THE SYSTEM

NOTE - Remove cores from service valves (if not already done).

Possible equipment damage.

Avoid deep vacuum operation. Do not use

compressors to evacuate a system.

Extremely low vacuum can cause internal

arcing and compressor failure. Damage

caused by deep vacuum operation will

void warranty.

WARNING !

NOTE -

ister to deliver liquid

refrigerant.

EVACUATION

26 49-5000962 Rev. 0

Electrical – Circuit Sizing and Wire Routing

Use a thermocouple or thermistor electronic vacuum

gauge that is calibrated in microns. Use an instrument

capable of accurately measuring down to 50 microns.

IMPORTANT

Fire Hazard. Use of aluminum wire with this product may

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death. Use copper wire only with this product.

WARNING

Failure to use properly sized wiring and circuit breaker

may result in property damage. Size wiring and circuit

EUHDNHUVSHU3URGXFW6SHFL¿FDWLRQVEXOOHWLQ(+%DQG

unit rating plate.

WARNING

Possible equipment damage.

Avoid deep vacuum operation. Do not use compressors

to evacuate a system. Extremely low vacuum can cause

internal arcing and compressor failure. Damage caused

by deep vacuum operation will void warranty.

WARNING

In the U.S.A., wiring must conform with current local codes

and the current National Electric Code (NEC). In Canada,

wiring must conform with current local codes and the current

Canadian Electrical Code (CEC).

Refer to the furnace or air handler installation instructions

for additional wiring application diagrams and refer to unit

nameplate for minimum circuit ampacity and maximum

overcurrent protection size.

24VAC TRANSFORMER

Use the transformer provided with the furnace or air handler

for low-voltage control power (24VAC - 40 VA minimum).

Evacuating the system of non-condensables is critical for

proper operation of the unit. Non-condensables are defined

as any gas that will not condense under temperatures and

pressures present during operation of an air conditioning

system. Non-condensables and water suction combine with

refrigerant to produce substances that corrode copper piping

and compressor parts.

Unit must be installed with GE Appliances approved

refrigerant detection system (RDS) and sensor.

Do not operate system until refrigerant detection system is

verified to be in good working order.

Refer to the unit nameplate for minimum circuit ampacity, and maximum

fuse or circuit breaker (HACR per NEC). Install power wiring and properly

sized disconnect switch.

NOTE — Units are approved for use only with copper conductors.

Ground unit at disconnect switch or to an earth ground.

SIZE CIRCUIT AND INSTALL SERVICE

DISCONNECT SWITCH

NOTE — 24VAC, Class II circuit connections are made in the control

panel.

Install room thermostat (ordered separately) on an inside wall

approximately in the center of the conditioned area and 5 feet (1.5m) from

the floor. It should not be installed on an outside wall or where it can be

affected by sunlight or drafts.

THERMOSTAT

5 FEET

(1.5M)

INSTALL THERMOSTAT

SERVICE

DISCONNECT

SWITCH

MAIN FUSE BOX/

BREAKER PANEL

49-5000962 Rev. 0 27

ROUTING HIGH VOLTAGE, GROUND AND CONTROL WIRING

HIGH VOLTAGE / GROUND WIRES

Any excess high voltage field wiring should be trimmed

and secured away from any low voltage field wiring. To

facilitate a conduit, a cutout is located in the bottom of the

control panel. Connect conduit to the control panel using

a proper conduit fitting.

NOTE - Wire tie provides low voltage control wire strain

relief and maintains separation of field-installed low and

high voltage circuits.

NOTE - For proper voltages, select thermostat wire

(control wires) gauge per table at right.

NOTE - Do not bundle any excess 24VAC control wires

inside control panel.

Install low voltage wiring from outdoor to indoor unit

and from thermostat to indoor unit as illustrated.

A - Run 24VAC control wires through hole with grommet

and secure with provided wire tie.

B - Make 24VAC thermostat wire connections. Locate the

two wires from the contactor and make connection

using field-provided wire nuts:

• Yellow to Y1

• Black to C (common)

Wire Run Length AWG# Insulation Type

Less than 100’ (30 meters) 18 Temperature Rating

More than 100’ (30 meters) 16 35ºC Minimum

Single-Stage Outdoor Unit with Single-Stage Indoor Unit

TSTAT

INDOOR

NO COM NC

ZONING

ALARM

O/B

SENSOR #1

SW1

SW2

LED

Thermostat

IndoorUnit

Outdoor Unit

Thermostat / Outdoor Unit Terminal Block (BLACK)

Indoor Unit Terminal Block (BLUE)

Class II Voltage Field Wiring

Black

Yellow

RDS Sensor

Single-Stage Furnace/

Single-Stage Air Handler

RDS Blower Control Board - 24 Volt

Cat # (27A05)

OPTIONAL

N.C. CONDENSATE

FLOAT SWITCH

FIGURE 15

FIGURE 14. Route Wiring

28 49-5000962 Rev. 0

FIGURE 16. Typical Factory Wiring Diagram – -018, -024, -030, -036, -048, and -060 Units Only

49-5000962 Rev. 0 29

FIGURE 17. Typical Factory Wiring – -041, -047 and -059 Units Only

System Operation

Some scroll compressors have an internal vacuum

protector that will unload scrolls when suction pressure

goes below 20 psig. A hissing sound will be heard when

the compressor is running unloaded. Protector will reset

when low pressure in system rises above 40 psig.

DO NOT REPLACE COMPRESSOR.

IMPORTANT

The outdoor unit and indoor blower will cycle on and off as

dictated by demands from the room thermostat. When the

thermostat’s blower switch is in the ON position, the indoor

blower will operate continuously.

HIGH PRESSURE SWITCH (S4)

NS16A units are equipped with a high-pressure switch that

is factory-wired and located in the liquid line.

The switch is a single pole, single throw (SPST), auto-reset

switch which is normally closed and removes power from the

compressor when discharge pressure rises above factory

setting at 590 ± 10 psig; resets at 418 ± 5 psig.

LOW PRESSURE SWITCH (S87)

This unit is equipped with a low pressure switch which is

located on the suction line. The SPST, normally closed

pressure switch opens when the suction pressure drops

below the factory setting of 40 psig ± 5 psig and automatically

resets at 90 psig ± 5 psig.

CRANKCASE HEATER (HR1) AND THERMOSTAT (S40)

Compressors in some models are equipped with a 40

watt or 70 watt, belly band type crankcase heater. HR1

prevents liquid from accumulating in the compressor. HR1

is controlled by a single pole, single throw thermostat switch

(S40) located on the belly band.

When compressor shell temperature drops below 50° F the

thermostat closes energizing HR1. The thermostat will open,

de-energizing HR1 once compressor shell temperature

reaches 70° F.

30 49-5000962 Rev. 0

Your heating and air conditioning system should be

inspected and maintained yearly (before the start of the

cooling and heating seasons) by a licensed professional

HVAC technician. You can expect the technician to check

the following items. These checks may only be conducted by

a licensed professional HVAC technician.

Outdoor Unit

1. Inspect component wiring for loose, worn or damaged

connections. Also check for any rubbing or pinching of

wires. Confirm proper voltage plus amperage of outdoor

unit. Mount fan blade to end of motor shaft.

2. Check the cleanliness of outdoor fan and blade assemblies.

Check condition of fan blades (cracks). Clean or replace

them, if necessary.

3. Inspect base pan drains for debris and clean as necessary.

4. Inspect the condition of refrigerant piping and confirm that

pipes are not rubbing copper-to-copper. Also, check the

condition of the insulation on the refrigerant lines. Repair,

correct, or replace as necessary.

5. Test capacitor. Replace as necessary.

6. Inspect contactor contacts for pitting or burn marks.

Replace as necessary.

7. Check outdoor fan motor for worn bearings/bushings.

Replace as necessary.

8. Inspect and clean outdoor coils, if necessary and note any

damage to coils or signs of leakage.

Indoor Unit (Air Handler or Furnace)

1. Inspect component wiring for loose, worn or damaged

connections. Confirm proper voltage plus amperage

indoor unit.

2. Inspect and clean or replace air filters in indoor unit.

3. Check the cleanliness of indoor blower and clean blower,

if necessary.

4. Inspect the evaporator coil (Indoor) drain pans and

condensate drains for rust, debris, obstructions, leaks or

cracks. Pour water in pans to confirm proper drainage

from the pan through to the outlet of the pipe. Clean or

replace as necessary.

5. Inspect and clean evaporator (indoor) coil, if necessary.

6. Inspect the condition of the refrigerant lines and confirm

that pipes are not rubbing copper-to-copper. Also, ensure

that refrigerant pipes are not being affected by indoor

air contamination. Check condition of insulation on the

refrigerant lines. Repair, correct, or replace as necessary.

7. Inspect the duct system for leaks or other problems.

Repair or replace as necessary.

8. Check for bearing/bushing wear on indoor blower motor.

Replace as necessary.

9. Indoor unit inspections of gas- or oil-fired furnaces will

also include inspection and cleaning of the burners, and

a full inspection of the gas valve, heat exchanger and flue

(exhaust) system.

10. Check functionality of refrigerant detection system.

11. Inspect refrigerant detection sensor.

General System Test with System Operating

1. Your technician should perform a general system test. He

will turn on the air conditioner to check operating functions

such as the startup and shutoff operation. He will also

check for unusual noises or odors, and measure indoor/

outdoor temperatures and system pressures as needed.

2. The technician will check the refrigerant charge per the

charging sticker information on the outdoor unit.

3. Verify that system total static pressure and airflow settings

are within specific operating parameters.

4. Verify correct temperature drop across indoor coil.

Maintenance

Failure to follow instructions will cause damage to

the unit.

This unit is equipped with an aluminum coil. Aluminum

coils may be damaged by exposure to solutions with

a pH below 5 or above 9. The aluminum coil should be

cleaned using potable water at a moderate pressure

(less than 50psi). If the coil cannot be cleaned using

water alone, GE Appliances recommends use of a

coil cleaner with a pH in the range of 5 to 9. The coil

must be rinsed thoroughly after cleaning.

In coastal areas, the coil should be cleaned with

potable water several times per year to avoid

corrosive buildup (salt).

NOTICE

49-5000962 Rev. 0 31

Start-Up and Performance Checklist

Job Name Job no. Date

Job Location City State

Installer City State

Unit Model No. Serial No. Service Technician

Nameplate Voltage

Rated Load Ampacity Compressor Outdoor Fan

Maximum Fuse or Circuit Breaker

Electrical Connections Tight? Indoor Filter clean? Supply Voltage (Unit Off)

Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.

Discharge Pressure Suction Pressure Refrigerant Charge Checked?

Refrigerant Lines: Leak Checked? Properly Insulated? Outdoor Fan Checked?

Service Valves: Fully Opened? Caps Tight? Thermostat

Voltage With Compressor Operating Calibrated? Properly Set? Level?

32 49-5000962 Rev. 0

Typical Field Wiring

FIGURE 18. Typical Field Wiring – All Units Except -041, -047 and -059

Supersedes

Litho U.S.A.

GROUND

LUG

HIGH

PRESSURE

SWITCH

NOTE-

FOR USE WITH COPPER CONDUCTORS

ONLY. REFER TO UNIT RATING PLATE

FOR MINIMUM CIRCUIT AMPACITY AND

MAXIMUM OVERCURRENT PROTECTION SIZE

PURPLE

BLACK

ORANGE

RED

YELLOW

OUTDOOR

FAN

BLACK

DUAL

CAPACITOR

GROUND

TO 24 VAC POWER

SOURCE

20 VA MINIMUM

NEC CLASS 2

TIMED OFF

CONTROL

COMPRESSOR

CONTACTOR

COMPRESSOR

CRANKCASE

HEATER

K1-1

208-230/ 60/

BLACK

YELLOW

RED

ORANGE

RED

BLACK

C12

CONTROL-TIMED OFF

KEY

COMPONENT

DESCRIPTION

C12

HR1

K1,-1

S24

S40

S87

COMPRESSOR

MOTOR-OUTDOOR FAN

CAPACITOR-DUAL

HEATER-COMPRESSOR

CONTACTOR-COMPRESSOR

SWITCH-HIGH PRESSURE

SWITCH-LOSS OF CHARGE

TERMOSTAT-CRANKCASE

SWITCH-LOW PRESS, COMP 1

RED

2011

TO 24 VAC

POWER SOURCE

20 VA MINIMUM

NEC CLASS 2

SINGLE SPEED COOLING MODELS

S87

YELLOW

BLACK

IF USING A4: CONNECT S4 TO TERMINAL 3 ON A4,

CONNECT Y1 TO TERMINAL 2 ON A4

S87

S40

BLACK

208-230/ 60/1

NOTE-

IF ANY WIRE IN THIS APPLIANCE IS REPLACED, IT

MUST BE REPLACED WITH WIRE OF LIKE SIZE,

RATING, INSULATION THICKNESS, AND TERMINATION.

LINE VOLTAGE FIELD INSTALLED

CLASS II VOLTAGE FIELD WIRING

DENOTES OPTIONAL COMPONENTS

S40

CRANKCASE

HEATER

BLK

HR1

49-5000962 Rev. 0 33

FIGURE 19. Typical Field Wiring – -041, -047, -059 Units Only

Supersedes

Litho U.S.A.

GROUND

LUG

HIGH

PRESSURE

SWITCH

NOTE-

FOR USE WITH COPPER CONDUCTORS

ONLY. REFER TO UNIT RATING PLATE

FOR MINIMUM CIRCUIT AMPACITY AND

MAXIMUM OVERCURRENT PROTECTION SIZE

GREEN

RED

YELLOW

OUTDOOR

FAN

BLACK

DUAL

CAPACITOR

GROUND

TO 24 VAC POWER

SOURCE

20 VA MINIMUM

NEC CLASS 2

TIMED OFF

CONTROL

COMPRESSOR

CONTACTOR

COMPRESSOR

CRANKCASE

HEATER

K1-1

208-230/ 60/

BLACK

YELLOW

RED

ORANGE

RED

BLACK

C12

CONTROL-TIMED OFF

KEY

COMPONENT

DESCRIPTION

C12

HR1

K1,-1

S24

S40

S87

COMPRESSOR

MOTOR-OUTDOOR FAN

CAPACITOR-DUAL

HEATER-COMPRESSOR

CONTACTOR-COMPRESSOR

SWITCH-HIGH PRESSURE

SWITCH-LOSS OF CHARGE

TERMOSTAT-CRANKCASE

SWITCH-LOW PRESS, COMP 1

RED

2011

TO 24 VAC

POWER SOURCE

20 VA MINIMUM

NEC CLASS 2

SINGLE SPEED COOLING MODELS

S87

YELLOW

BLACK

IF USING A4: CONNECT S4 TO TERMINAL 3 ON A4,

CONNECT Y1 TO TERMINAL 2 ON A4

S87

S40

BLACK

208-230/ 60/1

NOTE-

IF ANY WIRE IN THIS APPLIANCE IS REPLACED, IT

MUST BE REPLACED WITH WIRE OF LIKE SIZE,

RATING, INSULATION THICKNESS, AND TERMINATION.

LINE VOLTAGE FIELD INSTALLED

CLASS II VOLTAGE FIELD WIRING

DENOTES OPTIONAL COMPONENTS

S40

CRANKCASE

HEATER

BLK

HR1

34 49-5000962 Rev. 0

NOTE – The thermostat used may be electromechanical or

electronic.

NOTE – Transformer in indoor unit supplies power (24 VAC)

to the thermostat and outdoor unit controls.

COOLING:

1. Cooling demand initiates at Y1 in the thermostat.

2. 24VAC from indoor unit (Y1) energizes the TOC timed off

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S4 high pressure switch is closed).

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outdoor fan motor (B4).

4. Compressor (B1) and outdoor fan motor (B4) begin

immediate operation.

END OF COOLING DEMAND:

5. Cooling demand is satisfied. Terminal Y1 is de-energized.

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(B4) are de-energized and stop immediately.

If the outdoor unit is void of refrigerant, clean the system

using the procedure described below.

1 - Leak test the system using the procedure outlined on

Page 24.

2 - Evacuate the system using procedure outlined on Page

25.

3 - Use nitrogen to break the vacuum and install a new filter

drier in the system.

4 - Evacuate the system again using procedure outlined on

Page 25.

5 - Weigh in refrigerant.

Servicing Units Delivered Void of Charge

49-5000962 Rev. 0 35

Unit Start-Up

System Refrigerant

If unit is equipped with a crankcase heater, it should

be energized 24 hours before unit start-up to prevent

compressor damage as a result of slugging.

IMPORTANT

1 - Rotate fan to check for binding.

2 - Inspect all factory- and field-installed wiring for loose

connections.

3 - After evacuation is complete, open both the liquid and

vapor line service valves to release the refrigerant charge

(contained in outdoor unit) into the system.

4 - Replace the stem caps and tighten to the value listed in

TABLE 2.

5 - Check voltage supply at the disconnect switch. The

voltage must be within the range listed on the unit’s

nameplate. If not, do not start the equipment until you

have consulted with the power company and the voltage

condition has been corrected.

6 - Connect manifold gauge set for testing and charging.

This section outlines procedures for:

1 - Connecting gauge set for testing and charging;

2 - Checking and adjusting indoor airflow;

3 - Adding or removing refrigerant.

NOTE - System fault and lockout codes take precedence

over system status codes (cooling, heating operating

percentages or defrost/dehumidification).

R-454B is a zeotropic blend; will need to use saturated liquid

temperature to calculate liquid subcooling . Charge unit with

liquid only.

7 - Set the thermostat for a cooling demand. Turn on power

to the indoor unit and close the outdoor unit disconnect

switch to start the unit.

8 - Recheck voltage while the unit is running. Power must be

within range shown on the nameplate.

9 - Check system for sufficient refrigerant by using the

procedures that follow.

10 - Test functionality of refrigerant detection system. See

page 39.

FIGURE 20. Gauge Set Setup and Connections

TO LIQUID

LINE SERVICE

PORT

TEMPERATURE

SENSOR

DIGITAL SCALE

REFRIGERANT TANK

TEMPERATURE SENSOR

(LIQUID LINE)

MANIFOLD GAUGE SET

A. CLOSE MANIFOLD GAUGE SET VALVES AND CONNECT THE CENTER HOSE TO A CYLINDER OF R-454B SET FOR LIQUID PHASE CHARGING.

B. CONNECT THE MANIFOLD GAUGE SET'S LOW PRESSURE SIDE TO THE SUCTION LINE SERVICE PORT.

C. CONNECT THE MANIFOLD GAUGE SET'S HIGH PRESSURE SIDE TO THE LIQUID LINE SERVICE PORT.

D. POSITION TEMPERATURE SENSOR ON LIQUID LINE NEAR LIQUID LINE SERVICE PORT.

OUTDOOR UNIT

CHARGE IN

LIQUID PHASE

CONNECTIONS FOR TESTING AND CHARGING

GAUGE SET

LOW

HIGH

SUCTION LINE

36 49-5000962 Rev. 0

ADDING OR REMOVING REFRIGERANT

This system uses R-454B which operates at slightly lower pressures than HFC-410A. The field-installed liquid line filter drier

is approved for use with R-454B. Do not replace any components designed for use with HCFC-22. Check airflow using the

Delta-T (DT) process using the illustration in FIGURE 21.

FIGURE 21. Checking Indoor Airflow over Evaporator Coil using Delta-T Chart

Cº T

DROP

–DT=ºFACTION

53º 19 – 15 = 4 INCREASE THE AIRFLOW

58º 14 – 15 = -1 (WITHIN +3º RANGE) NO CHANGE

62º 10 – 15 = -5 DECREASE THE AIRFLOW

80 24 24 24 23 23 22 22 22 20 19 18 17 16 15

78 23 23 23 22 22 21 21 20 19 18 17 16 15 14

76 22 22 22 21 21 20 19 19 18 17 16 15 14 13

74 21 21 21 20 19 19 18 17 16 16 15 14 13 12

72 20 20 19 18 17 17 16 15 15 14 13 12 11 10

70 19 19 18 18 17 17 16 15 15 14 13 12 11 10

57 58 59 60 61 62 63 64 65 66 67 68 69 70

TEMPERATURE OF AIR

ENTERING INDOOR COIL ºF

INDOOR

COIL

DRY BULB

DRY

BULB

WET

BULB

DROP

19º

DRY-BULB

WET-BULB ºF

72º

64º

53º

AIR

FLOW

AIR

FLOW

ALL TEMPERATURES ARE

EXPRESSED IN ºF

1. DETERMINE THE DESIRED DT — MEASURE ENTERING AIR

TEMPERATURE USING DRY BULB (A) AND WET BULB (B).

DT IS THE INTERSECTING VALUE OF A AND B IN THE

TABLE (SEE TRIANGLE).

2. FIND TEMPERATURE DROP ACROSS COIL — MEASURE

ING THE COIL (A AND C). TEMPERATURE DROP FORMULA:

DROP

) = A MINUS C.

FERENCE BETWEEN THE MEASURED T

DROP

SIRED DT (T

DROP

–DT) IS WITHIN +3º, NO ADJUSTMENT IS

NEEDED. SEE EXAMPLE AT LEFT:

4. ADJUST THE FAN SPEED

TIONS TO INCREASE/DECREASE FAN SPEED.

ASSUME DT = 15 AND A TEMP. = 72º, BELOW C TEMPERATURES REQUIRE ACTION:

AIRFLOW

INDOOR COIL

TURES; RECHECK TEMPERATURES TO CONFIRM THAT THE

TEMPERATURE DROP AND DT ARE WITHIN +

3º.

Verify the unit is electrically grounded before charging

the system. Extreme care shall be taken not to overfill the

refrigerating system.

Charge should be checked and adjusted using information

outlined in this section and in the tables provided on the

charging label on the unit’s control access panel.

R-454B is a zeotropic blend of two refrigerants. At any

given refrigerant pressure, R-454B will have two saturation

temperatures, a saturated liquid temperature and a saturated

vapor temperature. See R-454B Refrigerant Pressure

Temperature Chart in the installation and service manual

for saturation temperatures.

R-454B Units must be charged with liquid refrigerant. Follow

conventional charging procedures when charging the

system. The technician is required to mark the total charge

of the installed system on the unit nameplate, which includes

the nameplate charge (factory charge) and additional charge

that is added to the system at the time of installation.

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be required. Connect manifold gauges and hoses following

conventional charging procedures. Position the R-454B

refrigerant cylinder to deliver liquid refrigerant.

NS16A unit is factory-charged with enough R-454B

refrigerant to accommodate a 15-foot length of refrigerant

piping. For line lengths over 15 feet, add 3 oz of refrigerant

for every 5 feet of piping beyond 15 feet.

Initiate a call for cooling and allow the refrigerant pressures

and temperatures to stabilize. Adjust the charge using the

subcooling method. The unit charging label provides the

target Subcooling Values. Record the liquid line temperature.

Measure the liquid line pressure and use the value to

determine the Saturated Liquid Temperature. Calculate

subcooling by subtracting the liquid line temperature from

the Saturated liquid temperature.

Subcooling = Saturated Liquid Temperature – Liquid

Line Temperature

Compare the results with the unit charging label.

Once system charging has been completed, the additional

charge and total charge must be marked on the unit

nameplate. Total Charge = Factory Charge + Additional

charge. The total charge is marked on the space adjacent to

“Total Charge”. See nameplate on Page 37.

Charging

49-5000962 Rev. 0 37

NOTE - The nameplate is shown for illustration purposes only. Go to actual nameplate on outdoor unit for charge

information.

Before carrying out this procedure, it is essential that the

technician is completely familiar with the equipment and all its

detail. It is recommended good practice that all refrigerants

are recovered safely.

Prior to the task being carried out, an oil and refrigerant

sample shall be taken in case analysis is required prior to

re-use of recovered refrigerant. It is essential that electrical

power is available before starting decommissioning.

a) Become familiar with the equipment and its operation.

b) Isolate system electrically.

c) Before attempting the procedure, ensure that:

• mechanical handling equipment is available, if required,

for handling refrigerant cylinders;

• all personal protective equipment is available and being

used correctly;

• the recovery process is supervised at all times by a

competent person;

• recovery equipment and cylinders conform to the

appropriate standards.

d) Pump down refrigerant system, if possible.

e) If a vacuum is not possible, make a manifold so that

refrigerant can be removed from various parts of the

system.

f) Make sure that cylinder is situated on the scales before

recovery takes place.

g) Start the recovery machine and operate in accordance

with instructions.

h) Do not overfill cylinders (no more than 80% volume liquid

charge).

i) Do not exceed the maximum working pressure of the

cylinder, even temporarily.

j) When the cylinders have been filled correctly and the

process completed, make sure that the cylinders and the

equipment are removed from site promptly and all isolation

valves on the equipment are closed off.

k) Recovered refrigerant shall not be charged into another

REFRIGERATING SYSTEM unless it has been cleaned

and checked.

Decommissioning

Equipment shall be labelled stating that it has been

decommissioned and emptied of refrigerant. The label

shall be signed and dated. Ensure that there are labels on

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used.

IMPORTANT

38 49-5000962 Rev. 0

Pressure

(psig)

Saturated

Liquid

Temp (°F)

Saturated

Vapor

Temp (°F)

Pressure

(psig)

Saturated

Liquid

Temp (°F)

Saturated

Vapor

Temp (°F)

Pressure

(psig)

Saturated

Liquid

Temp (°F)

Saturated

Vapor

Temp (°F)

Pressure

(psig)

Saturated

Liquid

Temp (°F)

Saturated

Vapor

Temp (°F)

0 -58.9 -57.1 158 58.9 61.3 272 93 95.4 362 113.4 115.6

25 -19.2 -17.2 160 59.6 62 274 93.5 95.9 364 113.8 116

30 -13.9 -11.8 165 61.4 63.8 276 94 96.4 366 114.2 116.4

35 -9.0 -6.9 170 63.1 65.5 278 94.5 96.9 368 114.6 116.8

40 -4.4 -2.3 175 64.9 67.3 280 95 97.4 370 115 117.2

45 -0.2 1.9 180 66.6 69 282 95.5 97.9 372 115.4 117.6

50 3.7 5.9 185 68.2 70.6 284 96 98.4 374 115.8 118

55 7.5 9.7 190 69.8 72.2 286 96.5 98.8 376 116.2 118.4

60 11 13.2 195 71.4 73.8

288 97 99.3 378 116.6 118.8

65 14.4 16.6 200 73 75.4 290 97.5 99.8 380 117 119.2

70 17.6 19.8 202 73.6 76 292 97.9 100.3 382 117.4 119.6

75 20.6 22.9 204 74.2 76.6 294 98.4 100.7 384 117.7 119.9

80 23.6 25.9 206 74.9 77.3 296 98.9 101.2 386 118.1 120.3

85 26.4 28.7 208 75.5 77.9 298 99.4 101.7 388 118.5 120.7

90 29.1 31.4 210 76.1 78.5 300 99.8 102.2 390 118.9 121.1

95 31.7 34 212 76.7 79.1 302 100.3 102.6 392 119.3 121.5

100 34.3 36.6 214 77.3 79.7 304 100.8 103.1 394 119.7 121.9

102 35.3 37.6 216 77.9 80.2 306 101.2 103.5 396 120.1 122.2

104 36.2 38.6 218 78.4 80.8 308 101.7 104 398 120.5 122.6

106 37.2 39.5 220 79 81.4 310 102.1

104.4 400 120.8 123

108 38.1 40.5 222 79.6 82 312 102.6 104.9 405 121.8 123.9

110 39.1 41.4 224 80.2 82.6 314 103 105.4 410 122.7 124.9

112 40 42.4 226 80.8 83.1 316 103.5 105.8 415 123.6 125.8

114 40.9 43.3 228 81.3 83.7 318 103.9 106.2 420 124.6 126.7

116 41.8 44.2 230 81.9 84.3 320 104.4 106.7 425 125.5 127.6

118 42.7 45.1 232 82.4 84.8 322 104.8 107.1 430 126.4 128.5

120 43.6 46 234 83 85.4 324 105.3 107.6 435 127.3 129.4

122 44.5 46.9 236 83.6 86 326 105.7 108 440 128.2 130.2

124 45.4 47.7 238 84.1 86.5 328 106.2 108.5 445 129 131.1

126 46.2 48.6 240 84.7 87.1 330 106.6 108.9 450 129.9 132

128 47.1 49.4 242 85.2 87.6 332 107 109.3 460

131.6 133.7

130 47.9 50.3 244 85.8 88.1 334 107.5 109.7 470 133.3 135.3

132 48.8 51.1 246 86.3 88.7 336 107.9 110.2 480 135 137

134 49.6 51.9 248 86.8 89.2 338 108.3 110.6 490 136.7 138.6

136 50.4 52.8 250 87.4 89.7 340 108.8 111 500 138.3 140.2

138 51.2 53.6 252 87.9 90.3 342 109.2 111.5 510 139.9 141.8

140 52 54.4 254 88.4 90.8 344 109.6 111.9 520 141.5 143.3

142 52.8 55.2 256 88.9 91.3 346 110 112.3 530 143 144.8

144 53.6 56 258 89.5 91.8 348 110.5 112.7 540 144.5 146.3

146 54.3 56.7 260 90 92.4 350 110.9 113.1 550 146.1 147.8

148 55.1 57.5 262 90.5 92.9 352 111.3 113.5 560 147.5 149.2

150 55.9 58.3 264 91 93.4 354 111.7 114 570 149 150.7

152 56.6 59 266 91.5 93.9 356 112.1 114.4 580 150.5 152.1

154 57.4 59.8 268 92 94.4 358 112.5 114.8 590 151.9 153.5

156 58.1 60.5 270 92.5 94.9 360 112.9 115.2 600 153.3 154.8

TABLE 4. R-454B Temperature – Pressure (Psig)

R-454B Refrigerant Pressure-Temperature Chart

Notes:

1. R-454B is a zeotropic blend and must be charged with liquid refrigerant only.

2. Saturated liquid temperature is used to calculate liquid subcooling.

3. Saturated vapor temperature is used to to calculate suction superheat.

4. See unit charging label for subcooling values and additional charging information.

49-5000962 Rev. 0 39

The RDS Blower Control Board is equipped with a Test/

Reset button. After the RDS Blower Control Board has been

mounted and wired, restore power to the HVAC system. The

system will then run through a purge sequence for five (5)

minutes. After the purge sequence is complete, proceed to

testing cooling demand and heating demand.

Cooling Demand

1 - Prompt a cooling demand at the thermostat.

2 - Press the Test button on the RDS Blower Control Board.

The system then executes a leak detection response.

3 - Observe the following sequence:

a. The LED indicator flashes the sequence for leak

detection (flashing blue).

b. The blower powers up.

c. The outdoor compressor powers down.

4 - Press the Test button to terminate the simulated Leak

Detected mode upon test completion.

Heating Demand

1 - Prompt a heating demand at the thermostat.

2 - Press the Test button on the RDS Blower Control Board.

The system then executes a leak detection response.

3 - Observe the following sequence:

a. The LED indicator flashes the sequence for leak

detection (flashing blue).

b. The blower powers up.

c. The gas burners power down.

d. The outdoor compressor powers down.

4 - Press the Test button to terminate the simulated Leak

Detected mode upon test completion.

The installation of the RDS Blower Control Board is complete

after both sequences are successfully completed

Start-Up Test Procedure

Charging Procedures

AIR CONDITIONER CHARGING INFORMATION

For complete charging procedures, refer to the applicable installation manual available online

Capacity -18 -24 -30 -36 -42 -48 -60

Normal Operating Pressures¹

°F(°C)² TXV System – Liquid Line ( ± 10 psig) / Suction Line ( ± 5 psig)

65 (18) 211 / 131 213 / 127 210 / 123 217 / 116 214 / 124 221 / 113 211 / 120

75 (24) 243 / 133 246 / 130 242 / 127 251 / 124 247 / 131 257 / 122 244 / 123

85 (29) 283 / 135 286 / 132 283 / 129 292 / 128 287 / 133 296 / 126 286 / 125

95 (35) 326 / 138 331 / 134 326 / 131 336 / 133 330 / 135 341 / 130 332 / 126

105 (41) 374 / 139 381 / 136 375 / 133 384 / 136 378 / 137 390 / 132 381 / 128

115 (45) 426 / 141 435 / 138 427 / 135 436 / 138 431 / 139 444 / 133 434 / 130

Approach (APP) Values³ – ºF(ºC) ± 1ºF (0.5ºC)

65 (18) 3 (-16.1) 3 (-16.1) 1 (-17.2) 1 (-17.2) 2 (-16.7) 3 (-16.1) 2 (-16.7)

75 (24) 4 (-15.6) 4 (-15.6) 3 (-16.1) 2 (-16.7) 5 (-15.0) 4 (-15.6) 4 (-15.6)

85 (29) 4 (-15.6) 4 (-15.6) 4 (-15.6) 3 (-16.1) 5 (-15.0) 5 (-15.0) 4 (-15.6)

95 (35) 5 (-15.0) 4 (-15.6) 4 (-15.6) 4 (-15.6) 5 (-15.0) 6 (-14.4) 4 (-15.6)

105 (41) 4 (-15.6) 4 (-15.6) 4 (-15.6) 5 (-15.0) 5 (-15.0) 6 (-14.4) 4 (-15.6)

115 (45) 3 (-16.1) 4 (-15.6) 4 (-15.6) 6 (-14.4) 5 (-15.0) 6 (-14.4) 4 (-15.6)

6XEFRROLQJ6&9DOXHV຾7;96\VWHP)&)&

65 (18) 9 (-12.8) 9 (-12.8) 10 (-12.2) 12 (-11.1) 10 (-12.2) 12 (-11.1) 11 (-11.7)

75 (24) 6 (-14.4) 7 (-13.9) 7 (-13.9) 10 (-12.2) 7 (-13.9) 10 (-12.2) 8 (-13.3)

85 (29) 7 (-13.9) 7 (-13.9) 7 (-13.9) 10 (-12.2) 6 (-14.4) 9 (-12.8) 8 (-13.3)

95 (35) 6 (-14.4) 7 (-13.9) 7 (-13.9) 9 (-12.8) 7 (-13.9) 8 (-13.3) 8 (-13.3)

105 (41) 7 (-13.9) 8 (-13.3) 7 (-13.9) 8 (-13.3) 7 (-13.9) 8 (-13.3) 9 (-12.8)

115 (45) 7 (-13.9) 8 (-13.3) 6 (-14.4) 7 (-13.9) 6 (-14.4) 8 (-13.3) 8 (-13.3)

¹ Typical pressures; indoor evaporator match-up, indoor air quantity and evaporator load will cause

the pressures to vary.

² Temperature of air entering outside coil.

³ Approach = Liquid Line Temperature minus Outdoor Ambient Temperature.

຾6XEFRROLQJ 6DWXUDWHG/LTXLG7HPSHUDWXUHPLQXV/LTXLG/LQH7HPSHUDWXUH

40 49-5000962 Rev. 0

R-454B is a zeotropic blend. Use saturated liquid

temperature to calculate liquid subcooling. Charge unit

with liquid only.

IMPORTANT

AIRFLOW CHECK - Both airflow and refrigerant charge

must be monitored for proper system set-up. It may be

necessary to alternately check and adjust the airflow and

the refrigerant charge.

NOTE – Be sure that filters and indoor and outdoor coils are

clean before testing.

To determine temperature drop across indoor coil (Delta-T),

measure the entering air dry bulb (DB) and wet bulb (WB)

temperatures at the indoor coil. Find Delta-T in table 4.

Measure coil’s leaving air DB and subtract that value from

entering air DB. The measured difference should be within

±3°F (±1.8°C) of table value: if too low, decrease the indoor

fan speed (refer to indoor unit for information). If the Delta-T

is too high, increase the indoor fan speed. Repeat charging

procedure and Delta-T (air flow adjustment) procedure until

both are correct.

Example: Assume entering air DB - 72, WB - 64, leaving

DB - 53. Therefore, Delta-T should be 15 (per table); delta

across coil is 72 - 53 or 19 (which is 4ºF higher than table

value). Action necessary: increase fan speed.

80 24 24 24 23 23 22 22 22 20 19 18 17 16 15

78 23 23 23 22 22 21 21 20 19 18 17 16 15 14

76 22 22 22 21 21 20 19 19 18 17 16 15 14 13

74 21 21 21 20 19 19 18 17 16 16 15 14 13 12

72 20 20 19 18 17 17 16 15 15 14 13 12 11 10

70 19 19 18 18 17 17 16 15 15 14 13 12 11 10

ºF 57 58 59 60 61 62 63 64 65 66 67 68 69 70

Table 4. Evaporator Coil Delta-T

Dry bulb temperature of air entering indoor coil (°F)

[ Wet bulb temperature of air entering indoor coil ]

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Unit Model Number Compressor C-S C-R

NS16A18 <3+.$$ 1.68 1.21

NS16A24 <3+.$$ 1.41 1.59

NS16A30 <3+.$$ 1.06 1.63

NS16A36 <3+.$$ 0.87 1.3

NS16A42 <3+.$$ 0.75 1.75

NS16A48 <%+.$$ 0.58 0.71

NS16A60 <%+.$$ 0.47 0.78

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Unit Model Number Compressor C-S C-R

NS16A18 <$.(3)9$6( 1.54 1.37

NS16A24 <$.(3)9$6( 1.26 1.37

NS16A30 <$.(3)9$6( 0.89 1.57

NS16A36 <$.(3)9$6( 0.72 1.43

NS16A42 <$.(3)9$6& 0.52 1.6

NS16A48 <$.(3)9$6& 0.46 1.3

NS16A60 <$.(3)9$6& 0.39 0.78

GE - General Electric NS16A48SA5 4-Ton 16 SEER2 Single-Stage Air Conditioner

Product's Documents

Service Manual

Specifications

GE - General Electric NS16A48SA5 Questions and Answers