Whirlpool AMD 335 Instruction for Use download pdf (Page 25)

Vacuum pump

Indoor unit

Refrigerant flow direction

3-way valve

Service port

(2) Turn

(8) Tighten

(7) Turn to fully

open the valve

Valve cap

(1) Turn

(8) Tighten

2-way valve

(6) Open 1/4 turn

(7) Turn to fully open the valve

(1) Turn

Valve cap

(8) Tighten

Connect to indoor unit

3-way valve diagram

Open position

Spindle

Connect to outdoor unit

Valve core

Needle

Service port cap

AIR PURGING

Air containing moisture remaining in the refrigeration cycle may cause a malfunction on the compressor.

After connecting the indoor and outdoor units, evacuate air and moisture from refrigerant cycle using a

vacuum pump, as shown below.

Note: Because the system pressure is high and also to protect the environment, be sure not to discharge

the refrigerant to the air directly.

How to Purge Air Tubes:

1. Unscrew and remove caps from 2 and 3-way valves.

2. Unscrew and remove cap from service valve.

3. Connect vacuum pump flexible hose to the service valve.

4. Start vacuum pump for 10-15 minutes until it reaches an absolute vacuum of 10 mm Hg.

5. With vacuum pump still running close the low pressure knob on vacuum pump manifold. Then stop

vacuum pump.

6. Open 2-way valve 1/4 turn, then close it after 10 seconds. Check tightness of all joints using liquid soap

or an electronic leak detector.

7. Turn 2 and 3-way valves stem. Disconnect vacuum pump flexible hose.

8. Replace and tighten all valve caps.

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Whirlpool AMD 335 Instruction for Use Page 25

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