Trane 4TTZ0 Installer's Manual page 26

STEP 8 - Record System Information for reference.
Record system pressures and temperatures after
charging is complete.
Outdoor model number = _________________
Measured Outdoor Ambient = __________ º F
Measured Indoor Ambient = __________ º F
Measured Liquid Line Temp = __________ º F
14.6 Subcooling Charging Below 55º F Outdoor Temp. (In Heating Only)
STEP 1 - Check the outdoor temperature. If
the ODT is less than 55º F, follow these charg-
ing instructions for the heating mode of opera-
tion. For temperatures above 55º F, see Sec-
tion 14.1.
NOTE: It is important to return in the spring
or summer to accurately charge the system in
the cooling mode with outdoor ambient above
55ºF.
For best results the indoor temperature should
be kept between 70º F and 80º F. See the
Indoor Temp illustration. Add system heat if
needed.
STEP 2 - Stabilize the system by operating in
the heating mode for a minimum of 20 minutes.
Important: Whenever charge is added or re-
moved, the system must run for a minimum of
20 minutes before accurate measurements can
be made.
26
Measured Suction Line Temp = __________ º F
Liquid Gage Pressure = __________ PSIG
Suction Gage Pressure = __________ PSIG
Dip Switch Selection = _____________
55º F
Outdoor Temp
20 MIN.
80º F
70º F
Indoor Temp
18-BC53D2-6