13
SCREEN
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.
Flue Hood and Bug Screen Installation
CONDENSATE DRAIN
Condensate Drain Connection
A 3/4” NPT drain connection is supplied for condensate pip
-
ing. 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
OR PIPE
3" MINIMUM
A POSITIVE LIQUID
SEAL IS REQUIRED
Drain Connection
NORMAL SEQUENCE OF OPERATION
Heating
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.
Single Stage Models:
NOTE:
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.
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.
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.
Two-Stage Models:
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.
