UUC130WCDA User Manual

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14 31-5000485 Rev. 4

Refrigerant Piping

The length of refrigerant lines, and the number of bends,

determine the pressure drop which affects capacity,

efficiency, and oil return to the compressor.

The outdoor unit connections are braze type. Tube size

should always be the same diameter as the connections

provided at the service valves. Installing tubing sizes

other than those shown can result in inadequate oil return

to the compressor and excessive refrigerant charge, and

will void the warranty.

Refrigerant Piping Model Number

12k 18k 24k 30k 36k 48k

Liquid O.D. (inch) 1/4" 1/4" 3/8" 3/8" 3/8" 3/8"

Suction O.D. in ( Std ) 1/2" 1/2" 5/8" 3/4" 3/4" 3/4"

Suction O.D. in ( Opt) 3/8" 5/8" 3/4" 5/8" 5/8" 7/8"

Max.Refrigerant Line

Length (inch)

82 98

Max.Elevation Vertical

Lift (inch)

33 49

*Pipe length must not be less than 10 feet.

** Oil traps are required every 15 ft. when the outdoor

unit is installed above the indoor unit.

Choose a location that places this unit as close to the

indoor unit as possible. Use only clean refrigeration grade

tubing. Always keep the tube ends capped until you are

ready to make the final connections. Remove burrs from

cut ends of tubing. Use tube benders to avoid kinking.

Insulate the suction line with a wall thickness of at least

3/8”. Support the tubing adequately to avoid sags that can

trap oil. Isolate the tubing so as not to transmit noise to

the building structure. Avoid sharp edges that could cut

the insulation or piping.

WARNING

It is illegal to discharge refrigerant into

the atmosphere. Use proper recovery methods and

equipment when working on parts of the unit containing

refrigerant. Service should be performed by a qualified

service agency and certified technician.

Using the appropriate fittings if needed, attach the line

set to the service valve stubs.

Apply heat paste to stub next to the valve and wrap the

valve body with a wet cloth.

At the outdoor service valves, remove the valve cores.

Introduce a purging flow of dry nitrogen through the first

tube, allowing it to flow out of the flared connection stub.

Braze connections with a brazing alloy. 15% braze rod is

recommended.

Repeat the above process for the second tube.

Pairing with A-coils

Manufacture recommend installing AHRI listed matched

indoor and outdoor system. Installing approved matched

indoor and outdoor system will provide optimum

efficiency and best overall system reliability. AHRI

certification for approved matched system can be verified

in the AHRI site, Residential AC and AC coil section.

https://www.ahridirectory.org/Search/SearchHome

Under the warranty, damage caused by a used or

unapproved component is not covered by the Standard

Base Warranty. When installing the Side-discharge

Outdoor Unit with non-AHRI listed 3rd party indoor

equipment, manufacture will presume that any damage to

the outdoor unit was not caused by the indoor equipment

if the following installation guidance is followed.

When installers pair 14 SEER Side-discharge outdoor

with a pre-existing “A coil + gas furnace indoor” system

1) Ensure to change the indoor coil to a new R410a, TXV,

tonnage to tonnage matched A-coil

2) Ensure to install a bi-flow Filter Drier (Field supplied) in

liquid line

3) Ensure the lineset size matches 14 SEER Side-

discharge outdoor as stated in the outdoor unit

installation manual (If existing lineset size is different

new lineset must be installed).

4) Ensure proper airflow

5) Ensure existing linesets are cleaned by flushing if re-

used.

When installers pair 14 SEER Side-discharge outdoor

with a new 3rd party AHU

1) Ensure the 3rd party AHU is a R410a, TXV, tonnage to

tonnage matched AHU

2) Ensure to install a bi-flow Filter Dryer (Field supplied) in