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Whirlpool WHP44 Installation Instructions Manual page 10

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Saturated Suction Pressure Temperature
Suction Pressure
PSIG
50
52
54
56
58
60
62
64
66
68
70
72
74
76
Charge by System Subcooling—TXV Metering
Single Stage Application
1. Purge the gauge lines.
2. Connect the service gauge manifold to the base-valve service
ports.
3. Run the system at least 10 minutes to allow the pressure to
stabilize.
4. Temporarily install a thermometer on the liquid (small) line
near the liquid line service valve with adequate contact.
Insulate the thermometer for the best possible reading.
5. Check the subcooling and superheat. Systems with TXV
application should have a subcooling of 7± 2ºF (1ºC) and
superheat of 7ºF to 9ºF (-13.9ºC to -12.8ºC).
If the subcooling and superheat are low, adjust TXV to 7ºF
to 9ºF (-13.9ºC to -12.8ºC) superheat. Check subcooling.
NOTE: To adjust the superheat, turn the valve stem
clockwise to increase and counterclockwise to decrease.
If the subcooling is low and the superheat is high, add
charge to raise the subcooling to 7 ± 2ºF (1ºC). Check
superheat.
If subcooling and superheat are high, adjust TXV valve to
7ºF to 9ºF (-13.9ºC to -12.8ºC) superheat. Check
subcooling.
If subcooling is high and superheat is low, adjust TXV
valve to 7ºF to 9ºF (-13.9ºC to -12.8ºC) superheat and
remove charge to lower the subcooling to 7 ± 2ºF (1ºC).
NOTE: Do not adjust the charge based on the suction
pressure unless there is a gross undercharge.
6. Disconnect the manifold set. Installation is now complete.
10
Saturated Suction
Temperature ºF (ºC)
R-410A
1 (-17.2)
3 (-16.1)
4 (-15.6)
6 (-14.4)
7 (-13.9)
8 (-13.3)
10 (-12.2)
11 (-11.7)
13 (-10.6)
14 (-10)
15 (-9.4)
16 (-8.9)
17 (-8.3)
19 (-7.2)
Suction Pressure
PSIG
78
80
85
90
95
100
110
120
130
140
150
160
170
2-Stage Application
Run the remote on low-stage cooling for 10 minutes until
refrigerant pressures stabilize. Follow the guidelines and methods
below to check the unit operation and ensure that the refrigerant
charge is within limits. Charge the unit on low stage.
1. Purge the gauge lines.
2. Connect the service gauge manifold to the base-valve service
ports.
3. Run the system at least 10 minutes to allow the pressure to
stabilize.
4. Temporarily install a thermometer on the liquid (small) line
near the liquid line service valve with adequate contact.
Insulate the thermometer for the best possible reading.
5. Check the subcooling and superheat. Systems with TXV
application should have a subcooling of 5ºF to 7ºF (-15ºC
to -13.9ºC) and superheat of 7ºF to 9ºF (-13.9ºC to -12.8ºC).
If the subcooling and superheat are low, adjust TXV to 7ºF
to 9ºF (-13.9ºC to -12.8ºC) superheat. Check subcooling.
NOTE: To adjust the superheat, turn the valve stem
clockwise to increase and counterclockwise to decrease.
If the subcooling is low and the superheat is high, add
charge to raise the subcooling to 5ºF to 7ºF (-15ºC
to -13.9ºC). Check superheat.
If subcooling and superheat are high, adjust TXV valve to
7ºF to 9ºF (-13.9ºC to -12.8ºC) superheat. Check
subcooling.
Saturated Suction
Temperature ºF (ºC)
R-410A
20 (-6.7)
21 (-6.1)
24 (-4.4)
26 (-3.3)
29 (-1.7)
31 (-0.6)
36 (2.2)
41 (5)
45 (7.2)
49 (9.4)
53 (11.7)
56 (13.3)
60 (15.6)

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