Section 13. Start Up; Section 14. System Charge Adjustment - Trane 4TWR4 Installation And Operation Manual

12.2 High Voltage Disconnect Switch
Install a separate disconnect switch at the outdoor unit.
For high voltage connections, flexible electrical conduit is recommended whenever vibration transmission may
create a noise problem within the structure.
12.3 High Voltage Ground
Ground the outdoor unit per national, state, and local code requirements.

Section 13. Start Up

13.1 System Start Up
STEP 1 - Ensure Sections 7 through 12 have been completed.
STEP 2 - Set System Thermostat to OFF.
STEP 3 - Turn on disconnect(s) to apply power to the indoor and outdoor units.
STEP 4 - Wait one (1) hour before starting the unit if compressor crankcase heater accessory is used and the
Outdoor Ambient is below 70ºF.
STEP 5 - Set system thermostat to ON.

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
Section 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.
12
See Section 14.2 for
Outdoor
Temperatures
Above 55º F
See Section 14.3 for
Outdoor
Temperatures
Below 55º F
120º F
55º F
Outdoor Temp 1
55º F
Outdoor Temp 2
80º F
70º F
Indoor Temp
18-BC95D1-5E-EN