Table 1. Normal Temperature - Pressure Relationships

TM 9-4120-425-14&P

REFRIGERATION SYSTEM SERVICING (PRESSURE TESTING) - Continued

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SERVICE PRESSURE TESTING - Continued

Refrigeration System Pressure Testing Continued

Start air conditioner. With the unit operating, allow gauges to stabilize. Take reading of the two gauges.

Compare gauge readings with the normal range of system pressure as shown on the Table of Normal Temperature

Pressure Relationships.

Disconnect gauges.

Install service valve access cover with screws.

Table 1. Normal Temperature - Pressure Relationships

Temperatures

Pressure Range (PSIG)

Outdoor Ambient

50F

75F

l00F

120F

Evaporator Intake

(10C)

(24C)

(38C)

(52C)

90F (32C)

55-65 Suction 150-

66-76 Suction 200-

76-86 Suction 280-

95-100 Suction 390-

Air to Unit (Dry

180 Discharge

240 Discharge

325 Discharge

428 Discharge

Bulb)

80F (27C)

50-60 Suction 140-

61-71 Suction 190-

71-81 Suction 270-

80-90 Suction 360-

Air to Unit (Dry

170 Discharge

230 Discharge

315 Discharge

410 Discharge

Bulb)

END OF TASK

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