Challenger Terra Gator 3244 Chassis. Manual - part 113

627333-A  

5-45

HVAC Testing and Adjusting

Relationship Between Temperature and Pressure 

(R-134a Refrigerant)

Temperature Degrees C 

(degrees F)

Pressure kPa (PSI)

−18 C (0.0 F)

44 kPa (6.4 PSI)

−17 C (2.0 F)

51 kPa (7.4 PSI)

−16 C (4.0 F)

59 kPa (8.5 PSI)

−14 C (6.0 F)

66 kPa (9.6 PSI)

−13 C (8.0 F)

74 kPa (10.7 PSI)

−12 C (10.0 F)

82 kPa (11.9 PSI)

−11 C (12.0 F)

90 kPa (13.1 PSI)

−10 C (14.0 F)

99 kPa (14.3 PSI)

−9 C (16.0 F)

108 kPa (15.6 PSI)

−8 C (18.0 F)

117 kPa (17.0 PSI)

−7 C (20.0 F)

127 kPa (18.4 PSI)

−6 C (21.0 F)

132 kPa (19.1 PSI)

−6 C (22.0 F)

137 kPa (19.8 PSI)

−5 C (23.0 F)

141 kPa (20.5 PSI)

−4 C (24.0 F)

147 kPa (21.3 PSI)

−4 C (25.0 F)

152 kPa (22.0 PSI)

−3 C (26.0 F)

157 kPa (22.8 PSI)

−3 C (27.0 F)

163 kPa (23.6 PSI)

−2 C (28.0 F)

168 kPa (24.4 PSI)

−2 C (29.0 F)

174 kPa (25.2 PSI)

−1 C (30.0 F)

179 kPa (26.0 PSI)

−1 C (31.0 F)

185 kPa (26.8 PSI)

0 C (32.0 F)

191 kPa (27.7 PSI)

1 C (33.0 F)

197 kPa (28.5 PSI)

1 C (34.0 F)

203 kPa (29.4 PSI)

2 C (35.0 F)

209 kPa (30.3 PSI)

2 C (36.0 F)

215 kPa (31.2 PSI)

3 C (37.0 F)

221 kPa (32.1 PSI)

3 C (38.0 F)

228 kPa (33.0 PSI)

4 C (39.0 F)

234 kPa (34.0 PSI)

4 C (40.0 F)

241 kPa (34.9 PSI)

5 C (41.0 F)

248 kPa (35.9 PSI)

6 C (42.0 F)

254 kPa (36.9 PSI)

Relationship Between Temperature and Pressure 

(R-134a Refrigerant) 

Temperature Degrees C 

(degrees F)

Pressure kPa (PSI)

6 C (43.0 F)

261 kPa (37.9 PSI)

7 C (44.0 F)

263 kPa (38.9 PSI)

7 C (45.0 F)

275 kPa (39.9 PSI)

8 C (46.0 F)

283 kPa (41.0 PSI)

8 C (47.0 F)

290 kPa (42.0 PSI)

9 C (48.0 F)

297 kPa (43.1 PSI)

9 C (49.0 F)

305 kPa (44.2 PSI)

10 C (50.0 F)

312 kPa (45.3 PSI)

11 C (51.0 F)

320 kPa (46.4 PSI)

11 C (52.0 F)

328 kPa (47.5 PSI)

12 C (53.0 F)

336 kPa (48.7 PSI)

12 C (54.0 F)

344 kPa (49.9 PSI)

13 C (55.0 F)

352 kPa (51.0 PSI)

13 C (56.0 F)

360 kPa (52.2 PSI)

14 C (57.0 F)

369 kPa (53.5 PSI)

14 C (58.0 F)

377 kPa (54.7 PSI)

15 C (59.0 F)

385 kPa (55.9 PSI)

16 C (60.0 F)

394 kPa (57.2 PSI)

16 C (61.0 F)

403 kPa (58.2 PSI)

17 C (62.0 F)

412 kPa (59.8 PSI)

17 C (63.0 F)

421 kPa (61.1 PSI)

18 C (64.0 F)

430 kPa (62.4 PSI)

18 C (65.0 F)

440 kPa (63.8 PSI)

19 C (66.0 F)

450 kPa (65.2 PSI)

19 C (67.0 F)

459 kPa (66.8 PSI)

20 C (68.0 F)

469 kPa (68.0 PSI)

21 C (69.0 F)

478 kPa (69.4 PSI)

21 C (70.0 F)

488 kPa (70.8 PSI)

22 C (71.0 F)

498 kPa (72.3 PSI)

22 C (72.0 F)

509 kPa (73.8 PSI)

23 C (73.0 F)

519 kPa (75.3 PSI)

23 C (74.0 F)

530 kPa (76.8 PSI)

24 C (75.0 F)

540 kPa (78.3 PSI)

24 C (76.0 F)

551 kPa (79.9 PSI)

25 C (77.0 F)

562 kPa (81.5 PSI)

26 C (78.0 F)

573 kPa (83.1 PSI)

26 C (79.0 F)

584 kPa (84.7 PSI)

5-46

627333-A  

HVAC Testing and Adjusting

27 C (80.0 F)

595 kPa (86.3 PSI)

27 C (81.0 F)

607 kPa (88.0 PSI)

28 C (82.0 F)

618 kPa (89.7 PSI)

28 C (83.0 F)

630 kPa (91.4 PSI)

29 C (84.0 F)

642 kPa (93.1 PSI)

29 C (85.0 F)

654 kPa (94.8 PSI)

30 C (86.0 F)

666 kPa (96.6 PSI)

31 C (87.0 F)

678 kPa (98.4 PSI)

31 C (88.0 F)

691 kPa (100.2 PSI)

32 C (89.0 F)

703 kPa (102.0 PSI)

32 C (90.0 F)

716 kPa (103.8 PSI)

33 C (91.0 F)

729 kPa (105.7 PSI)

33 C (92.0 F)

742 kPa (107.6 PSI)

34 C (93.0 F)

755 kPa (109.5 PSI)

34 C (94.0 F)

768 kPa (111.4 PSI)

35 C (95.0 F)

782 kPa (113.4 PSI)

36 C (96.0 F)

796 kPa (115.4 PSI)

36 C (97.0 F)

809 kPa (117.4 PSI)

37 C (98.0 F)

823 kPa (119.4 PSI)

37 C (99.0 F)

838 kPa (121.5 PSI)

38 C (100.0

°F)

852 kPa (123.5 PSI)

38 C (101.0 F)

866 kPa (125.6 PSI)

39 C (102.0 F)

881 kPa (127.8 PSI)

39 C (103.0 F)

896 kPa (129.9 PSI)

40 C (104.0 F)

911 kPa (132.1 PSI)

41 C (105.0 F)

926 kPa (134.3 PSI)

41 C (106.0 F)

941 kPa (136.5 PSI)

42 C (107.0 F)

956 kPa (138.7 PSI)

42 C (108.0 F)

972 kPa (141.0 PSI)

43 C (109.0 F)

988 kPa (143.3 PSI)

43 C (110.0 F)

1004 kPa (145.6 PSI)

44 C (111.0 F)

1020 kPa (147.9 PSI)

44 C (112.0 F)

1036 kPa (150.3 PSI)

45 C (113.0 F)

1053 kPa (152.7 PSI)

46 C (114.0 F)

1069 kPa (155.1 PSI)

46 C (115.0 F)

1087 kPa (157.6 PSI)

47 C (116.0 F)

1103 kPa (160.0 PSI)

Relationship Between Temperature and Pressure 

(R-134a Refrigerant) 

Temperature Degrees C 

(degrees F)

Pressure kPa (PSI)

47 C (117.0 F)

1120 kPa (162.5 PSI)

48 C (118.0

°F)

1138 kPa (165.1 PSI)

48 C (119.0 F)

1156 kPa (167.6 PSI)

49 C (120.0 F)

1173 kPa (170.2 PSI)

49 C (121.0 F)

1191 kPa (172.8 PSI)

50 C (122.0 F)

1209 kPa (175.4 PSI)

51 C (123.0 F)

1228 kPa (178.1 PSI)

51 C (124.0 F)

1247 kPa (180.8 PSI)

52 C (125.0 F)

1265 kPa (183.5 PSI)

52 C (126.0 F)

1285 kPa (186.3 PSI)

53 C (127.0 F)

1304 kPa (189.1 PSI)

53 C (128.0 F)

1323 kPa (191.9 PSI)

54 C (129.0 F)

1342 kPa (194.7 PSI)

54 C (130.0 F)

1362 kPa (197.6 PSI)

55 C (131.0 F)

1382 kPa (200.5 PSI)

56 C (132.0 F)

1402 kPa (203.4 PSI)

56 C (133.0 F)

1422 kPa (206.3 PSI)

57 C (134.0 F)

1443 kPa (209.3 PSI)

Relationship Between Temperature and Pressure 

(R-134a Refrigerant) 

Temperature Degrees C 

(degrees F)

Pressure kPa (PSI)

627333-A  

5-47

HVAC Testing and Adjusting

Labeling Procedure

Attach a cable strapped label to air conditioning system

indicating system charge.

Charging System

NOTE: An accurate refrigerant charge is only

determined by weight or temperature of

evaporator core. Pressures can not be used to

determine if air conditioning system is correctly

charged. Do not add or remove part of

refrigerant.

NOTE: Never charge liquid or gas through discharge

side (high) of system when engine is in

operation.

IMPORTANT: In an expansion valve system which uses

poly alkaline glycol (PAG), sight glass is not a

reliable way to determine system charge.

NOTE: For expansion valve systems containing PAG

oil, sight glass can not be used to charge

system. for a full system charge, refrigerant

must be recovered and evacuated. After

recovery and evacuation, charge system with

correct amount of refrigerant. This is the only

procedure recommended.

NOTE: If engine is running, charge system with

refrigerant gas through low pressure side.

Never charge liquid refrigerant through suction

side (low) of air conditioning system. If engine is

not running, charge with liquid or gas through

high pressure side.

NOTE: Before charging system, check the following

important items:

1. Condenser and evaporator

•

Inspect condenser and evaporator for foreign

material such as dirt, insects, plastic bags, etc.

These things can will inhibit airflow.

•

With roof-mounted condensers, verify both fan

motors are running. Check for restrictions as a

clean condenser will increase compressor life.

2. Check for a loose belt on compressor.

3. Clean fresh and recirculation filters.

4. Check moisture indicator on the receiver-dryer or

in-line dryer, replace if indicator is pink or white. A

blue moisture indicator is normal.

5. Check condensation tube on evaporator to ensure it

is not plugged and is in place.

NOTE: Before an accurate moisture reading, a new

receiver-dryer requires two to three hours of

operation.

NOTE: Preferred method for charging air conditioning

system is below:

•

Recover refrigerant.

•

Evacuate system.

•

Charge system with correct amount of

refrigerant, measured by weight.

NOTE: After system has been recovered and

evacuated, charge with correct amount of

refrigerant measured by weight.

5-48

627333-A  

HVAC Testing and Adjusting

COMPLETE CHARGE OF SYSTEM FROM 
A REFRIGERANT TANK WITH A SCALE

Use of a refrigerant tank and scale is necessary to

charge system using the following procedure.

NOTE: Engine can not be running when charging

system with a liquid.

FIG. 2: Charging System Components

(1)

Low Pressure Valve

(2)

High Pressure Valve

(3)

Charging Hose

(4)

Low Pressure Hose

(5)

High Pressure Hose

(6)

Manifold Gauge Set

(7)

Service Valve (Discharge)

(8)

Service Valve (Suction)

(9)

Refrigerant Tank

(10) Valve on Top of Refrigerant Tank

(11) Scale

(E) Vapor

(F)

Liquid

FIG. 2

g00669264

1

6

2

4

5

3

10

9

11

E

F

7

8