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3.11 Sequence of Operation
Cooling (cooling only)
When the thermostat calls for cooling, the circuit from R to G is
completed. The blower motor is energized directly by 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.
Heating (electric heat only)
Note: 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 24VAC
signal from the thermostat. The circuit from R to W is completed
energizing the heating contactor(s).
3.12 Operational And Checkout Procedures
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 following list:
[ ] 1. Be sure unit suspension (if used) is secure and there are no
tools or loose debris in, around or on top of the unit.
[ ] 2. Properly insulate suction lines and fittings.
[ ] 3. Properly secure and isolate all refrigerant lines.
[ ] 4. Verify that all electrical connections are tight.
[ ] 5. Check all duct outlets; they must be open and unrestricted.
[ ] 6. Check drain lines and be sure all joints are tight.
[ ] 7. Be sure the return air filter is installed.
[
] 8. Operate complete system in each mode to verify proper
performance. Verify operation of supplementary electric heater.
3.13 Maintenance
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.
6
Section 4. Wiring
AC SYSTEMS
Thermostat
R
24 V AC HO T
G
FA N
24 V AC
B/C
Common
COOLING
Y
HEA T
W
Outdoor
Air Handler
Unit
R
G
C
B
Blue
Y
W1
White
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