INDICATORS. - TM-5-4120-383-140033

TM5-4120-383-14

2-3.

INDICATORS.

(See fig. 2-2.)

The refrigerant sight glass is the only visual indicator

incorporated in the Model F9000H-3S air conditioner. The

refrigerant sight glass has a small chamber with a glass window

It is

through which the refrigerant condition can be observed.

installed in the liquid refrigerant line downstream from the

condenser coil. Liquid refrigerant actually flows through the

sight glass chamber only during cooling cycles when the air

conditioner is in operation in the COOL mode. The unit must be

operated approximately 15 minutes at maximum cooling prior to

checking condition of refrigerant at sight glass. The sight glass

is equipped with a center indicator that is moisture sensitive.

Dry refrigerant is indicated by green, it turns to chartreuse when

the moisture content becomes undesirable, and to yellow when the

level becomes unacceptable. Excessive moisture in the refrigerant

may damage or possibly destroy the compressor.

If the liquid

refrigerant observed in the sight glass has a milky appearance or

frequent bubbles appear, the volume of refrigerant is low and the

system should be charged. Either moisture or low charge

indications should be reported to direct support maintenance for

appropriate refrigeration system action.

Do not operate the air conditioner in the COOL mode

if the refrigerant color has reached the yellow band

or if numerous bubbles appear in the sight glass.

COOL mode operation may be continued with the

refrigerant color in the chartreuse band or with only

an occasional bubble appearing in the window, but the

sight glass should be rechecked after each four hours

of operation to insure that the condition has not

become worse.

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