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Section 14. System Charge Adjustment
14.1 Temperature Measurements (Systems can be rated with TXV, EEV or Piston. Ensure charging method
is correct).
STEP 1 - Check the outdoor temperatures.
Subcooling (in cooling mode) is the only recommended*
method of charging above 55º F ambient outdoor tem-
perature.
Note: For Superheat (In Cooling Mode), refer to the
Superheat Charging Table on pg 18.
*Weigh-In Method can be used for initial installation,
or system replacement when power is not available or
when the desired temperatures for the standard charging
method are outside normal bounds. See Section 14.3.
For best results the indoor temperature should be kept
between 70º F to 80º F.
Note: It is important to return in the spring or summer to
accurately charge the system in the cooling mode when
outdoor ambient temperature is above 55º F.
14.2 Subcooling Charging in Cooling (Above 55º F Outdoor Temp.)
STEP 1 - Use the refrigerant line total length
and lift measurements from Section 5.3.
Total Line Length = __________ Ft.
Vertical Change (Lift) = __________ Ft.
12
120º F
55º F
Outdoor Temp
80º F
70º F
Indoor Temp
LIFT
18-AC123D1-1C-EN
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