Check Refrigerant Pressure Using Manifold Gauge

(a) This is a method to identify trouble areas by using a manifold gauge set. Read the manifold gauge pressure under the following conditions. Test conditions:

• Blower speed control switch at HI.

• Air inlet mode damper set at recirculation.

• Temperature control lever in MAX. COLD position.

• Air temperature at air inlet 30 to 35°C (86 to 95°F).

Manifold Gauge Readings

Item

Symptom

Amount of Refrigerant

Corrective Procedures

1

Bubbles visible

Insufficient*

(1) Check for gas leakage and repair if necessary

(2) Add refrigerant until bubbles disappear

2

No bubbles visible

Empty, insufficient or too much

Refer to items 3 and 4

3

No temperature difference between compressor inlet and outlet

Empty or nearly empty

(1) Check for gas leakage with gas leak detector and repair if necessary

(2) Add refrigerant until bubbles disappear

4

Considerable temperature difference between compressor inlet and outlet

Correct or too much

Refer to items 5 and 6

5

Immediately after A/C turned OFF, refrigerant becomes clear

Too much

(1) Drain or discharge refrigerant

(2) Bleed air and supply proper amount of purified refrigerant

6

Immediately after A/C turned OFF, refrigerant foams and then becomes clear

Correct

-

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