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Blower Mode
1. On a call for fan operation, the thermostat applies 24
VAC directly to the G terminal and the blower contactor.
2. The circulating blower is energized immediately.
Heat Pump Heating Mode
1. Set the thermostat system switch to Heat and the
thermostat fan switch to Auto. On a call for heating,
the thermostat closes, applying 24 VAC to Y1, G, & Y2
if Stage 2 heating is required.
2. G applies 24VAC to the main circulating blower circuit.
3. Y1 & Y2 apply 24VAC through all safety switches before
energizing their respective contactors.
4. Outdoor fan contactor is energized through auxiliary
contacts on either of the compressor contactors once
energized.
5. As the thermostat is satisfied the contactors are de-
energized in sequence.
6. The circulating blower motor is de-energized immediately.
Heat Pump Heating Mode + Optional
Electric Heat
(Stage 3 Heat or Emergency Heat)
• If optional electric heat is added, a 3 Stage Heat / 2
Stage Cool 24VAC heat pump thermostat must be used.
• This heating system energizes the fan on a call for heat.
Select the GAS setting for fan mode of operation during
thermostat configuration.
• Several options are available for a room thermostat
depending on the accessories installed with the unit.
Consult the instructions for the specific type of thermostat
being used for proper unit operation.
On a call for heating the thermostat closes, applying 24
VAC to Y1, G, & Y2 if Stage 2 heating is required. If the
desired room temperature is not maintained, Stage 3 heat
will call applying 24 VAC to W2, energizing the electric
heat kits. NOTE: If Stage 3 Electric Heat is energized,
Stage 2 compressor will cycle off.
As the thermostat is satisfied the contactors are de-
energized in sequence.
Emergency Heat Mode
Set the thermostat system switch to Emer.Heat and
the thermostat fan switch to Auto. On a call for heating
the thermostat closes, applying 24 VAC to W2 only.
Compressors and outdoor fans will not operate when
Emergency Heat mode is selected. Sustained use of
electric resistance heat in place of the heat pump will
result in an increase in electric utility costs.
Unit Fails to Operate
If the unit does not operate properly in either the heating
or cooling mode, be certain to check the following:
1. The thermostat is operating properly.
2. Electrical power to the unit is turned on.
3. All safety switches are closed.
4. The service doors are in place.
5. Transformer circuit breaker is reset.
12
UNIT MAINTENANCE
WARNING:
To avoid risk of electrical shock, personal injury,
or death, disconnect all electrical power to the unit
before performing any maintenance or service.
The unit may have more than one electrical supply.
CAUTION:
Use care when removing parts from this unit.
Personal injury can result from sharp metal edges
in equipment of sheet metal construction.
Routine Maintenance
Proper maintenance is important to achieve optimum
performance from the unit The ability to properly
perform maintenance on this equipment requires certain
mechanical skills and tools. If you do not possess these
skills, contact your dealer for maintenance. Consult your
local dealer about the availability of maintenance contracts.
At a minimum, routine maintenance should include the
following:
Air Filters
WARNING:
Never operate the unit without a filter in place.
Dust and lint in the return air can build up
on internal components, resulting in loss of
efficiency, equipment damage, and possible fire
risk.
It is recommended that you inspect and clean or replace
the air filters every 3 to 4 weeks. Units are equipped with
2" pleated disposable filters. Filter rack is adjustable for 1"
permanent type filters. Do not use 1" disposable filters.
Replace with filters of like size and kind rated for at least
500 feet per minute.
Blower Compartment
Make sure to verify proper operation after servicing. The
blower compartment should be cleaned monthly during
the heating and cooling seasons to remove any dirt and
lint that may have accumulated in the compartment or
on the blower and motor. Buildup of dirt and lint on the
blower and motor can create excessive loads on the motor
resulting in higher than normal operating temperatures
and possible shortened service life.
Condensate Drain & Outdoor Coil
Inspect the condensate drain and outdoor coil at the
beginning of each cooling season. Remove any debris.
Clean the outdoor coil and hail guard louvers (optional)
as necessary using a mild detergent and water. Rinse
thoroughly with water.
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