Amana ASH13018 Service Manual download pdf (Page 60)

SERVICING

Temp.

°F.

Gauge Pressure

(PSIG) Freon-22

Temp.

°F.

Gauge Pressure

(PSIG) Freon-22

-40

-38

-36

-34

0.61

1.42

2.27

3.15

102.5

106.3

110.2

114.2

-32

-30

-28

-26

4.07

5.02

6.01

7.03

118.3

122.5

126.8

131.2

-24

-22

-20

-18

8.09

9.18

10.31

11.48

135.7

140.5

145.0

149.5

-16

-14

-12

-10

12.61

13.94

15.24

16.59

154.7

159.8

164.9

170.1

-8

-6

-4

-2

17.99

19.44

20.94

22.49

175.4

180.9

186.5

192.1

24.09

25.73

27.44

29.21

100

102

104

106

197.9

203.8

209.9

216.0

31.04

32.93

34.88

36.89

108

110

112

114

222.3

228.7

235.2

241.9

38.96

41.09

43.28

45.53

116

118

120

122

248.7

255.6

262.6

269.7

47.85

50.24

52.70

55.23

124

126

128

130

276.9

284.1

291.4

298.8

57.83

60.51

63.27

66.11

132

134

136

306.3

314.0

321.9

329.9

69.02

71.99

75.04

78.18

140

142

144

146

338.0

346.3

355.0

364.3

81.40

84.70

88.10

91.5

158

150

152

154

374.1

384.3

392.3

401.3

95.1

98.8

156

158

160

411.3

421.8

433.3

S-109 CHECKING SUBCOOLING

Refrigerant liquid is considered subcooled when its tempera-

ture is lower than the saturation temperature corresponding

to its pressure. The degree of subcooling equals the degrees

of temperature decrease below the saturation temperature at

the existing pressure.

1. Attach an accurate thermometer or preferably a thermo-

couple type temperature tester to the liquid line as it leaves

the condensing unit.

2. Install a high side pressure gauge on the high side (liquid)

service valve at the front of the unit.

3. Record the gauge pressure and the temperature of the line.

4. Review the technical information manual or specification

sheet for the model being serviced to obtain the design

subcooling.

5. Obtain the Liquid Line Pressure gauge reading and convert

the liquid line pressure gauge reading to temperature by

finding the gauge reading in Temperature - Pressure Chart

and reading to the left, find the temperature in the °F. Column.

6. The difference between the thermometer reading and

pressure to temperature conversion is the amount of subcool-

ing.

Add charge to raise subcooling. Recover charge to lower

subcooling.

Subcooling Formula = Sat. Liquid Temp. - Liquid Line

Temp.

EXAMPLE:

a. Liquid Line Pressure = 274.5

b. Corresponding Temp. °F. = 120°

c. Thermometer on Liquid line = 109°F.

To obtain the amount of subcooling subtract 109°F from

120°F.

The difference is 11° subcooling. See the specification sheet

or technical information manual for the design subcooling

range for your unit.

S-110 CHECKING EXPANSION VALVE OPERA-

TION

1. Remove the remote bulb of the expansion valve from the

suction line.

2. Start the system and cool the bulb in a container of ice

water, closing the valve. As you cool the bulb, the suction

pressure should fall and the suction temperature will rise.

3. Next warm the bulb in your hand. As you warm the bulb,

the suction pressure should rise and the suction tempera-

ture will fall.

4. If a temperature or pressure change is noticed, the

expansion valve is operating. If no change is noticed, the

valve is restricted, the power element is faulty, or the

equalizer tube is plugged.

5. Capture the charge, replace the valve and drier, evacuate

and recharge.

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 74 75

Comments to this Manuals

No comments

Amana ASH13018 Service Manual Page 60

Comments to this Manuals

Related products and manuals for Heat pumps Amana ASH13018