Section 14. System Charge Adjustment (Systems Can Be Rated With Txv, Eev Or Piston) - Trane A5AC5018A Installation And Operation Manual

Section 14. System Charge Adjustment
NOTE: For systems using a indoor piston metering device, refer to the Superheat charging method and chart.
For systems using a TXV or EEV indoor metering device, refer to Subcool charging method and charts.
14.1 Temperature Measurements
STEP 1 - Check the outdoor temperatures.
Subcooling (in cooling mode) is the only recom-
mended method of charging above 55º F ambi-
ent outdoor temperature.
Note: For Superheat (In Cooling Mode), refer to
the Superheat Charging Table
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 tempera-
ture 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 and use
line length adders as shown in Section 5.2 if
required.
Total Line Length = __________ Ft.
Vertical Change (Lift) = __________ Ft.
Note: Use this method when matched with a
TXV or EEV indoor unit.
88-A5AC5001-1A-EN
(Systems can be rated with TXV, EEV or Piston)
120º F
55º F
Outdoor Temp
80º F
70º F
Indoor Temp
LIFT
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