Mitsubishi MXZ-2B20NA-1 INSTALLATION INSTRUCTIONS

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4. PURGINGPROCEDURES,LEAKTEST,ANDTESTRUN

4-2.GASCHARGE

Perform gas charge to unit.

1)Connectgascylindertotheserviceportofstopvalve.

2)Perform airpurge ofthe pipe(or hose) coming fromrefrigerant gas

cylinder.

3)

Replenishspeciedamountofthe refrigerant,whileoperatingtheair

conditioner for cooling.

Note:

caseofaddingrefrigerant,complywiththequantityspeciedforthe

refrigeratingcycle.

CAUTION:

When

chargingtherefrigerantsystemwithadditionalrefrigerant,besure

touseliquidrefrigerant.Addinggasrefrigerantmaychangethecomposi-

tion

oftherefrigerantinthesystemandaffectnormaloperationoftheair

conditioner.Also,chargethesystemslowly,otherwisethecompressor

will be locked.

Tomaintainthehighpressureofthegascylinder,warmthegascylinder

withwarmwater[under140°F(40°C)]duringcoldseason.Butneveruse

nakedreorsteam.

Union

Stop valve

Liquid pipe

Union

Indoor

unit

Stop valve with

service port

Gas pipe

Refrigerant gas

cylinder

operating

valve

(forR410A)

Gauge manifold

valve(forR410A)

Chargehose(forR410A)

Refrigerantgascylinder

for R410A with siphon

Electronic scale for

refrigerant charging

Refrigerant(liquid)

Outdoor

unit

4-1.PURGINGPROCEDURESANDLEAK

TEST

1)Remove service port caps fromstop valves on both sides

of refrigerant lines. (The stop valves are fully closed when

shipped.)Leaveclosed.

2)Connectgaugemanifoldtoportsofstopvalves.

3)Evacuate thesystemto 4000 microns from both service

valves.Systemmanifoldgaugesmustnotbeusedtomeasure

vacuum. A micron gauge must be used at all times. Break the

vacuumwithNitrogen(N2)intothedischargeservicevalveto0

PSIG.

4)

Evacuatethesystemto1500microns.Breakthevacuumwith

Nitrogen(N2)intothedischargeservicevalveto0PSIG.

5)Evacuatethesystemto500microns.

6)Close gaugemanifold valves, stopthe pump,and conducta

30 minute rise test.

7)Systemshouldhold500micronsforaminimumof1hour.

8)Fullyopenallstopvalvesonbothsidesofgaspipeandliquid

pipe.Operating withoutfullyopening lowerstheperformance

and this causes trouble.

9)Refer to1-3 andcharge theprescribedamountof additional

refrigerantifneeded.Besuretochargeslowlywithliquidrefrig

erant.

Otherwise compositionof therefrigerantin thesystem

maybechangedandaffectperformanceoftheairconditioner.

10)Removegaugemanifoldsandreplaceserviceportcapsand

tighten.

11)

Leaktest

Stop valve

for GAS

Gauge manifold

valve(forR410A)

Compound pressure

gauge(forR410A)

Handle

Low

Handle

High

*Close

*Open

Hexagonal

wrench

*4 to 5 turns

Stop valve

for LIQUID

Pressure gauge

(forR410A)

Precautions when using

the control valve

When attaching the control valve to

theserviceport,valvecoremayde-

form or loosen if excess pressure is

applied.Thismaycausegasleak.

Service port

Charge hose

(forR410A)

Body

Open

Control

valve

When attaching the control valve to

the service port, make sure that the

valve core is in closed position, and

then tighten part A. Do not tighten

partAorturnthebodywhenvalve

core is in open position.

Charge hose

(forR410A)

–14.7 psi

[Gauge]

(–0.101

MPa)

Service port cap

(Torque 10 to 13 ft

-Ib, 13.7 to 17.7 N•m,

140 to 180 kgf

•cm)

Stop

valve cap

(Torque 15 to 22 ft-lb,

19.6 to 29.4 N•m, 200

to300kgf▪cm)

Vacuum pump

(forR410A)

Adapter for

preventing

thebackow

JG79A253H04_en.indd 7 2014/03/10 14:12:58

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Mitsubishi MXZ-2B20NA-1 20k BTU - M-Series Outdoor Condenser - For 2 Zones

INSTALLATION INSTRUCTIONS - Page 7