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Filters
T
O PREVENT PROPERTY D AMAGE DUE TO F IRE AND LOSS OF
EQUIPMENT EFFICIENCY O R EQUIPMENT DAMAGE DUE TO DUST AND LINT
BUILD UP O N INTERNAL P ARTS, NEVER OPERATE UNIT W ITHOUT A N AIR
FILTER I NSTALLED I N THE RETURN A IR S YSTEM.
Even though a return air filter is not supplied with this unit,
there must be a means of filtering all return air. All units may
be externally filtered.
Refer to the unit filter size chart in the appendix for filter size
information.
Filters installed external to the unit should be sized in
accordance with their manufacturer recommendations. A
throwaway filter must be sized for a maximum face velocity of
300 feet per minute.
Filter Installation
Important: When installing a filter, the air flow arrows on the
filter must point toward the circulator blower.
VENTING
NOTE: Venting is self-contained. Do not modify or block.
Flue Hood Installation
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 the installation
instructions, included in the flue hood assembly package located
in the blower compartment.
Flue Hood and Bug Screen Installation
CAUTION
CONDENSATE DRAIN
Condensate Drain Connection
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
FLEXIBLE
TUBING-HOSE
OR PIPE
A POSITIVE LIQUID
SEAL IS REQUIRED
Drain Connection
NORMAL SEQUENCE OF OPERATION
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.
2. The induced draft blower energizes for a 15-second pre-
purge.
3. The spark igniter and gas valve energizes for 7 seconds.
NOTE: The igniter produces a very intense electrical spark
that ignites the gas.
4. Main burners light and control detects presence of flame.
5. The 30-second HEAT FAN ON delay time begins after the
main burners light.
6. The unit delivers heat to the conditioned space until the
thermostat is satisfied.
7. The gas valve de-energizes. The induced draft blower
continues operation for a 29-second post-purge.
NOTE: (Single stage models) 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 de-energize. This allows any
additional heat in the heat exchanger to be transferred to
the conditioned space.
Two-Stage Models:
If the call is for low stage heat, the induced draft blower
switches to low speed and the high stage gas valve closes 5
seconds after the main burners light. If call is for high stage
heat, induced draft blower remains at high speed and high
stage gas valve remains open.
NOTE: If a single stage thermostat is used, the control will
step to low stage after the main burners light and remain at
low stage for 5 or 10 minutes, depending on jumper position.
If the call for HEAT remains after the transition delay time
expires, the control will transition from low stage to high
stage.
Two-Stage Models:
Induced draft blower remains at low speed (or switches from
high to low if operating at high stage heat) for the 30-second
post purge.
12
2" MINIMUM
3" MINIMUM
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