Section 14. System Charge Adjustment - Trane 4TTR7 Series Installer's Manual

Section 14. System Charge Adjustment

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. See Section 14.2.
For outdoor temperatures below 55º F, see Sec-
tion 14.3.
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.
For best results the indoor temperature should
be kept between 70º F to 80º 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.
18-AC94D1-4C-EN
See Section 14.2 for
Outdoor
Temperatures
Above 55º F
See Section 14.3 for
Outdoor
Temperatures
Below 55º F
LIFT
120º F
55º F
Outdoor Temp 1
55º F
Outdoor Temp 2
80º F
70º F
Indoor Temp
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