Trane TEM6A0B24H21SC, Installer'S Manual, Page: 8 / 32

8 18-GF74D1-1R-EN
the compressor contactor of the outdoor unit. The
contactor will close and start the compressor and
condenser fan motor.
C Co oo olliin ng g ((h he ea att p pu um mp p))
When the thermostat calls for cooling, the circuit
from R to G is completed. The blower motor is
energized directly by the ECM fan control, which
receives the 24VAC signal from the thermostat.
The circuit from R to Y is also complete energizing
the compressor contactor of the outdoor unit. The
contactor will close and start the compressor and
condenser fan motor.
Circuit R to O energizes the reversing valve to the
cooling position.
H He ea attiin ng g ((h he ea att p pu um mp p))
When the thermostat calls for heating, the circuit
from R to G is completed and the blower motor is
energized directly by the ECM fan control, which
receives the 24VAC signal from the thermostat.
The circuit from R to Y is also complete energizing
the compressor contactor of the outdoor unit. The
contactor will close and start the compressor and
condenser fan motor.
In the heating mode, the reversing valve of the
outdoor unit is not energized.
If the indoor temperature continues to fall, the R to
W circuit is completed energizing the electric heat
contactor(s).
H He ea attiin ng g ((e elle eccttrriicc h he ea att o on nlly y))
N No otte e:: The thermostat must be setup to bring the
blower on when the electric heat is energized.
When the thermostat calls for heating, the circuit
from R to G is completed and the blower motor is
energized directly by the ECM fan control, which
receives the 24VAC signal from the thermostat. The
circuit from R to W is completed energizing the
heating contactor(s).
D De effrro osstt
Supplemental heat during defrost can be provided
by connecting the X2 (black) wire from the outdoor
unit to W1 or W2 at the indoor unit. This will
prevent cold air from being discharged from the
indoor unit during defrost.
13. O Op pe erra attiio on na all a an nd d C Ch he ecckko ou utt P Prro occe ed du urre ess
To obtain proper performance, all units must be
operated and charge adjustments made in
accordance with procedures found in the Service
Facts document of the outdoor unit. After
installation has been completed, it is recommended
that the entire system be checked against the
checkout list located at the back of this document.
See
“Checkout Procedures,” p. 31
14. M Ma aiin ntte en na an ncce e
The system air filter(s) should be inspected, cleaned
or replaced at least monthly. Make certain that the
access panels are replaced and secured properly
before placing the unit back in operation. This
product is designed for dependable service;
however, periodic maintenance should be
scheduled and conducted by trained professional
service personnel. This service should be
conducted at least annually, and should include
testing and inspection of electrical and refrigerant
components. The heat transfer surface should be
cleaned. The blower motor is permanently
lubricated for normal operating conditions.
F Fe ea attu urre ess