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VENTING
NOTE: Venting is self-contained. Do not modify or block.
F
H
I
LUE
OOD
NSTALLATION
Install the exhaust flue hood and combustion air intake hood
prior to operation of the unit.
To install the flue hood cover, please refer to IO-653*, included
in the flue hood assembly box located in the blower
compartment.
Flue Hood and Bug Screen Installation
CONDENSATE DRAIN
C
D
C
ONDENSATE
RAIN
ONNECTION
A 3/4” NPT drain connection is supplied for condensate piping. An
external trap must be installed for proper condensate drainage.
NOTE: Maximum torque is 10 in-lbs.
DRAIN
CONNECTION
UNIT
2" MINIMUM
FLEXIBLE
TUBING-HOSE
3" MINIMUM
OR PIPE
A POSITIVE LIQUID
SEAL IS REQUIRED
Drain Connection
NORMAL SEQUENCES OF OPERATION
H
EATING
This unit is equipped with an ignition control that automatically
lights the main burner. DO NOT attempt to light the main
burners by any other method.
1. Thermostat calls for heat. The induced draft blower
energizes for a 15-second pre-purge.
2. The spark igniter and gas valve energizes for 7 seconds.
NOTE: The igniter produces a very intense electrical spark
that ignites the gas.
3. The 30-second HEAT FAN ON delay time begins.
4. The unit delivers heat to the conditioned space until the
thermostat is satisfied.
5. The gas valve deenergizes. The induced draft blower
continues operation for a 29-second post-purge.
6. Ignition control begins timing the HEAT FAN OFF delay.
There is an adjustable HEAT FAN OFF delay of
approximately 120/135/150 seconds (factory set at 150).
After the HEAT FAN OFF delay time has elapsed, the blower
will deenergize. This allows any additional heat in the
heat exchanger to be transferred to the conditioned space.
C
OOLING
1. Thermostat calls for cooling. The compressor and outdoor
fan are energized.
2. Approximately seven seconds later, the indoor fan starts.
3. The unit will deliver cooling to the conditioned space until
the thermostat is satisfied.
4. The compressor and outdoor fan will be de-energized
when the thermostat opens.
5. The indoor fan continues to run for approximately 60
seconds after the thermostat is satisfied. This allows
additional cooling from the indoor coil to be transferred to
the conditioned space. Then, the indoor fan stops.
NOTE: A 180-second anti-short cycle is integral to the control and
prevents recycling of the compressor.
F
O
AN
NLY
1. Thermostat calls for FAN ONLY by energizing “G”.
2. Approximately seven seconds later, the indoor fan starts.
3. The indoor fan continues to run for approximately 60
seconds after “G” is de-energized.
STARTUP, ADJUSTMENTS, AND CHECKS
H
S
EATING
TARTUP
This unit is equipped with an electronic ignition device to
automatically light the main burners. It also has a power vent
blower to exhaust combustion products.
On new installations, or if a major component has been
replaced, the operation of the unit must be checked.
Check unit operation as outlined in the following instructions.
If any sparking, odors, or unusual sounds are encountered,
shut off electrical power and recheck for wiring errors, or
obstructions in or near the blower motors. Duct covers must
be removed before operating unit.
Heat Anticipator Setting
Set the heat anticipator on the room thermostat to 0.4 amps
to obtain the proper number of heating cycles per hour and to
prevent the room temperature from overshooting the room
thermostat setting.
Rollout Protection Control
The rollout protection device opens, cutting power to the gas
valve, if the flames from the burners are not properly drawn
into the heat exchanger. The rollout protection device is located
on the burner bracket. The reason for elevated temperatures
at the control should be determined and repaired prior to
resetting this manual reset control.
Page 11
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