Section 14. System Charge Adjustment - Trane 4TTR4018-060 Installation And Operation Manual

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 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.
18-AC51D1-10E-EN
120º F
55º F
Outdoor Temp
80º F
70º F
Indoor Temp
LIFT
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