Specifications

6
Charge Using Sub-cooling Method (Fixed Orifice/Thermal Expansion Valve Systems)—Outdoor Temperatures 65°F
(18ºC) or Above
Use this method if charging a fixed orifice or Thermal Expansion
Valve system when the outdoor ambient temperature is 65°F
(18ºC) or above.
1. Attach the manifold gauge hose to the liquid service port.
2. If the condensing unit pressures are stable, use a digital
thermometer to record the liquid line temperature.
3. Record the liquid line pressure reading.
4. Use a temperature/pressure chart for refrigerant (R-22) to
determine the saturation temperature for the liquid line
pressure reading.
5. Subtract the liquid line temperature from the saturation
temperature to determine sub-cooling. See Sub-cooling
Values for Fixed Orifice or Thermal Expansion Valve Systems
chart.
_____ ° (Saturation Temperature °F) - _____ ° (Liquid Line
Temperature °F) = _____ ° (Sub-cooling Value °F)
6. Compare the sub-cooling value with those shown in Sub-
cooling Values for Fixed Orifice or Thermal Expansion Valve
Systems chart.
■ If sub-cooling is greater than shown, recover some
refrigerant.
■ If sub-cooling is less than shown, add some refrigerant.
Charge Using Superheat Method (Fixed Orifice Systems)—Outdoor Temperatures 65°F (18ºC) or Above
Use this method if charging a fixed orifice system when the
outdoor ambient temperature is 65ºF (18ºC) or above.
1. Attach the manifold gauge hose to the suction service port.
2. If the condensing unit pressures are stable, use a digital
thermometer to record the suction line temperature.
3. Record the suction line pressure reading.
4. Use a temperature/pressure chart for refrigerant (R-22) to
determine the saturation temperature for the suction line
pressure reading.
5. Subtract the saturation temperature from the suction line
temperature to determine the superheat. See Superheat
Values for Fixed Orifice Systems chart.
_____ ° (Suction Line Temperature °F) - _____ ° (Saturation
Temperature °F) = _____ ° (Superheat Value °F)
6. Compare the superheat value with those shown in Superheat
Values for Fixed Orifice Systems chart.
■ If superheat is greater than shown, add some refrigerant.
■ If superheat is less than shown, recover some refrigerant.
Sub-cooling Values for Fixed Orifice or Thermal Expansion Valve Systems
Outdoor
Temperature
ºF (ºC)
Liquid Sub-cooling—
ƼF
W2GH318A W2GH324A W2GH330A W2GH336A W2GH342A W2GH348A W2GH360A
65 (18) 13 15 14 13 13 15 14
75 (23.9) 10 13 12 10 10 13 12
85 (29.4) 8 11 11 8 8 11 11
95 (35)791077910
105 (40.6)6896689
115 (46.1)3563356
Superheat Values for Fixed Orifice Systems
(80° DB/67° WB Return Air)
Outdoor Ambient Temperature ºF (ºC) Superheat ºF
60 (15.6) 38
65 (18.3) 35
70 (21.1) 30
75 (23.9) 26
80 (26.7) 22
85 (29.4) 18
90 (32.2) 12
95 (35) 8
100 (37.8) 5
105 (40.6) 0