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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 NOTE: When installing a filter, the air
flow arrows on the filter must point toward the
circulator blower.
UNIT
2 Ton
Min. Filter Size (1)20 x 20 x 1 (1)20 x 25 x1
Recommended Filter Sizes
VENTING
NOTE: Venting is self-contained. Do not modify or
block.
Installation - Flue Hood Exhaust
1. Locate the flue hood assembly box in the unit.
2. Slide screen over flanges on the lower flue hood.
3. Slide screen and lower flue hood into hood.
4. Using the three screws provided, attach the hood
(with the opening facing down) over the flue exhaust
opening in the utility panel.
HOOD
LOWER
FLUE
HOOD
LIP
Installation - Combustion Air Intake Hood
1. Locate the second hood.
2. Using the three screws provided, attach the hood
(with the opening facing down) to the heat exchanger
access door.
2 1/2 Ton
3 Ton
3 1/2 /4 Ton
(1)25 x 25 x1 (2)20 x 20 x 1
SCREEN
CONDENSATE DRAIN
Condensate Drain Connection
A 3/4" NPT drain connection is supplied for condensate
piping. An external trap must be installed for proper con-
densate drainage.
DRAIN
CONNECTION
UNIT
FLEXIBLE
TUBING-HOSE
OR PIPE
A POSITIVE LIQUID
SEAL IS REQUIRED
NORMAL SEQUENCES OF OPERATION
Heating
This unit is equipped with an ignition control that automat-
ically lights the main burner. DO NOT attempt to light the
main burners by any other method.
1. Thermostat calls for low or high stage heating.
2. Induced draft blower energizes for 15-second pre-
purge.
3. The spark igniter and low and high stage gas valve
are energized for 7 seconds. NOTE: The igniter pro-
duces a very intense electrical spark that ignites the
gas.
4. Main burners light and control detects presence of
flame.
5. If the call is for low stage heat, the induced draft blow-
er 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.
6. The 30-second HEAT FAN ON delay time begins after
the main burners light.
7. The unit delivers heat to the conditioned space until
the
8. Gas valve(s) de-energizes. The induced draft blower
continues operation for a 30-second post-purge.
9. Induced draft blower remains at low speed (or switch-
es from high to low if operating at high stage heat) for
the 30-second post purge.
10. Ignition control begins timing the HEAT FAN OFF
delay. There is an adjustable HEAT FAN OFF delay
of approximately 90/120/150/180 seconds (factory set
at 150). If the unit is operating at high stage when the
call for heat is removed, the blower will operate for 30
seconds at high heat speed then switch to low heat
speed for the remainder of the selected HEAT FAN
OFF delay.
13
2" MINIMUM
3" MINIMUM
Drain Connection
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