PARTIAL CHARGE

TM 9-4120-428-14

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d) Continue to charge until the sight glass is clear and bubble-free.

24. Turn the MODE SELECTOR switch is set to OFF.

PARTIAL CHARGE

WARNING

Dangerous Chemical Pressurized Refrigerant is used during the operation of this

equipment.

Use great care to avoid contact with liquid refrigerant or inhaling refrigerant gas being

discharged from any container under pressure. Sudden and irreversible tissue damage can

result from freezing. Wear thermal protective gloves and a face protector or safety glasses

in any situation where skin or eye contact is possible.

Prevent contact of refrigerant gas with open flames or hot surfaces. Heat causes the

refrigerant to break down and form carbonyl chloride (phosgene), a highly toxic and

corrosive gas.

NOTE

The charging operation should be done with all panels in place except for the refrigerant

charging valve access cover. Use recycled refrigerants whenever possible.

1. Connect the 1/4 inch yellow hose (charge) to a cylinder of R-22 set to deliver gas only.

2. Slightly loosen hose connections on the HIGH and LOW pressure charging valves.

3. Ensure the vacuum and charge valves are closed.

4. Open the pressure gauge and compound gauge valves.

5. Open the refrigerant cylinder valve.

6. Slightly open the charge valve to allow a small amount of refrigerant to purge air from the hoses. Tighten all hose

connections on the HIGH and LOW pressure charging valves. Close the charge valves.

CAUTION

Severe damage can affect the compressor. Never introduce liquid refrigerant into the low

pressure (suction) charging valves.

7. Close the compound gauge valve.

8. Connect the power at the power source.

9. Turn the air conditioner on and operate in COOL mode with the temperature selector set at the maximum COOLER

position.

10. With the unit running, observe the sight glass on the back of the condenser section. Be sure that the refrigeration

system is not in BYPASS mode. When the system goes into BYPASS, bubbles will appear in the sight glass.

A green center indicates the refrigerant moisture content is acceptable.

A yellow center indicates there is too much moisture in the system. It must be discharged, evacuated, and

charged again.

A milky- white or bubbly liquid indicates the system has a low charge.

A clean, bubble-free liquid around the center indicates the system is fully charged.

11. If the charge is still low, carefully add refrigerant.

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