Manual MundoClima MUCSR-H6 - Model 24 to 60 (page 15 of 40) (English)

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3.3 Purging air and checking gas leakage

When piping work is completed, it is necessary to purge the

air and check for gas leakage.

WARNING

Do not mix any substance other than the specified refrigerant

into the refrigeration cycle.

When refrigerant gas leaks occur, ventilate the room as soon as

possible.

The specified refrigerant should always be recovered and never

be released directly into the environment.

Use a vacuum pump for the specified refrigerant. Using the

same vacuum pump for different refrigerants may damage the

vacuum pump or the unit.

If using additional refrigerant, perform air purging from the

refrigerant pipes and indoor unit using a vacuum pump, than

charge additional refrigerant.

Use a hexagonal wrench(4mm) to operate the stop valve rod.

All refrigerant pipe joints should be tightened with a torque

wrench at the specified tightening torque.

1) Connect projection side of charging hose (which comes from

gauge manifold) to gas stop valve's service port.

2) Full open gauge manifold's low-pressure valve (Lo) and

completely close its high-pressure valve (Hi)

(High-pressure valve subsequently requires no operation.)

3) Do vacuum pumping and make sure that the compound

pressure gauge reads -0.1MPa (-76cmHg).*1

4) Close gauge manifold's low-pressure valve (Lo) and sop

vacuum pump.

(Keep this state for a few minutes to make sure that the

compound pressure gauge pointer does not swing back.)*2

5) Remove caps from liquid stop valve and gas stop valve.

6) Turn the liquid stop valve's rod 90 degrees counterclockwise

with a hexagonal wrench to open valve.

Close it after 5 seconds, and check for gas leakage.

Using soapy water, check for gas leakage from indoor unit's

flare and outdoor unit's flare and valve rods.

After the check is complete, wipe all soapy water off.

7) Disconnect charging hose from gas stop valve's service port

then fully open liquid and gas stop valves.

(Do not attempt to turn valve rod byond its stop.)

8) Tighten valve caps and service port caps for the liquid and

gas stop valves with a torque wrench at the specified torques.

*1. Pipe length vs. Vacuum pump run time

3.5 Refrigerant pipig work

Pipe length and refrigerant amount:

Connective

pipe length

3.4 Additional refrigerant charge

CAUTION

Refrigerant may only be charged after performing the leak

test and the vacuum pumping.

Check the type of refrigerant to be used on the machine

nameplate. Charging with an unsuitable refrigerant may

cause explosions and accidents, so always ensure that the

appropriate refrigerant is charged.

Refrigerant containers shall be opened slowly.

The outdoor unit is factory charged with refrigerant. Calculate the

added refrigerant according to the diameter and the length of the

liquid pipe of the outdoor unit/indoor unit connection.

1) Caution on the pipe handling

Protect the open end of the pipe against dust and moisture.

All pipe bends should be as gentle as possible. Use a pipe

bender for bending.

Be sure to add the proper amount of additional refrigerant.

Failure to do so may result in reduced performance.

Pipe length Up to 15m More than 15m

Not less than 15minNot less than 10 minRun time

*2. If the compound pressure gauge pointer swings back,

refrigerant may have water content or a loose pipe joint may

exists. Check all pipe joints and retighten nuts as needed,

then repeat steps 2) through 4).

Be sure to

place a cap.

If no flare cap is

available, cover the

flare mouth with

tape to keep dirt or

water out.

Wall

Rain

Less

than 5m

Air purging

method

Use vacuum

pump.

Use vacuum

pump.

Additional amount of refrigerant to be charged

R410A: (L-5)x15g/m R410A: (L-5)x30g/m

Liquid side:

INSTALLATION MANUAL

9.52mm (3/8")

Liquid side:

6.35mm (1/4")

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MundoClima MUCSR-H6 - Model 24 to 60 Manual

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