MRCOOL CASSETTE12HP-230 Installation Manual download pdf (Page 12)

3.3 Installation of the throttle. (For some models)

Precautions

- For ensuring throttled efficiency, please mount the throttle

as horizontally as possible.

- Wrap the supplied anti-shock rubber at external of the

throttle for denoise.

1 Anti-shock rubber

2 Throttle

Indoor

Outdoor

3.4 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(0.2in / 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

1 Throttle

2 Liquid pipe

3 Gas pipe

500mm/19.7in

For more info visit www.mrcool.com

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MRCOOL CASSETTE12HP-230 Installation Manual Page 12

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