Table 41.1. Troubleshooting

TM 5-4120-356-14

f. Installation

(1) Refer to paragraph 4-14d and install a new dehydrator.

(2) Refer to figure 4-6 and install a new compressor.

(3) Refer to paragraph 4-4c and check the system for refrigerant leaks. If any leaks are found, refer to

paragraph 4-4d and repair leaks.

(4) Reconnect plug P3 to J3 on junction box (see figure 3-12), and install junction box.

(6) Refer to figure 4-4 and evacuate the refrigerant system.

(6) Refer to paragraph 4-10 and charge the system with refrigerant. Leave the pressure gages connected.

(7) With the unit operating in the cooling mode, check pressures. For proper discharge and suction lines

pressure, see Table 4-1.1.

(8) If pressures are satisfatory, close all valves, remove gages and turn the selector switch to the "OFF"

position. If pressures are unsatisfactory, refer to Table 4-1-2.

Table 41.1. Troubleshooting

NORMAL TEMPERATURE-PRESSURE RELATIONSHIPS

95F (36C) dry bulb return air to unit

100F

110F

125F

Outdoor ambient

50F

75F

43.5C

10C

24C

38C

52C

temperature

Gauge Pressures

65-75

70-80

75-90

56-65

Suction (psig)

56-60

(Kg/CM2)

4.92-5.62

4.57-5.27

5.27-6.33

3.93-4.22

3.93-4.57

275-295

400-420

185-205

375-380

Discharge (psig)

135-155

(Kg/CM2)

28.12-29.53

9.50-10.90

13.00-14.41

19.33-20.74

26.36-26.72

80F (27C) dry bulb return air to unit

100F

125F

50F

75F

Outdoor ambient

52C

10C

24C

38C

temperature

Gauge Pressures

Suction (psig)

56 min.

56-65

65-75

(Kg/CM2)

4.27-5.27

3.93 min.

3.93-4.57

Discharge (psig)

130-150

180-200

270-290

290-410

(Kg/CM2)

9.14-10.55

12.65-14.06

18.98-20.39

20.39-28.82

NOTE: Dry bulb temperatures are measured with an ordinary thermometer

Change 3 4-22.1