Installation Guide
507332-01Page 28 of 35 Issue 1723
For Safety, shut unit off and remove manometer as
soon as an accurate reading has been obtained. Take
care to replace pressure tap plug.
IMPORTANT
Fan Control
The fan on time of 45 seconds is not adjustable. The heat
fan off delay (amount of time that the blower operates after
the heat demand has been satised) may be adjusted by
changing the jumper position across the ve pins on the
integrated control. The unit is shipped with a factory fan
off delay setting of 90 seconds. The fan off delay affects
comfort and is adjustable to satisfy individual applications.
Adjust the fan off delay to achieve a supply air temperature
between 90° and 110° F at the moment that the blower
is de-energized. Longer off delay settings provide lower
return air temperatures; shorter settings provide higher
return air temperatures. See Figure 28.
Figure 28. Heat Fan Off Time in Seconds
Constant Torque Motor
These units are equipped with a permanent magnetic
indoor blower motor that provides constant torque. The
motor has ve speed taps all referenced to the same signal
common. Each tap requires 24 volts to be energize.
Thermostat Heat Anticipation
Set the heat anticipator setting (if adjustable) according to
the amp draw listed on the wiring diagram that is attached
to the unit.
NOTE: Do not secure the electrical conduit directly to the
air ducts or structure.
Electrical
1. Check all wiring for loose connections.
2. Check for the correct voltage at the furnace (furnace
operating). Correct voltage is 120VAC ± 10%.
3. Check amp-draw on the blower motor with inner
blower panel in place.
Unit Nameplate__________ Actual _______________
Blower Speeds
Follow the steps below to change the blower speeds.
1. Turn off electrical power to furnace.
2. Remove blower access panel.
3. Disconnect existing speed tap at integrated control
speed terminal.
NOTE: Termination of any unused motor leads must
be insulated.
4. Place unused blower speed tap on integrated control
“PARK” terminal or insulate.
5. Refer to blower speed selection chart on unit wiring
diagram for desired heating or cooling speed. See
Blower performance data.
6. Connect selected speed tap at integrated control
speed terminal.
7. Resecure blower access panel.
8. Turn on electrical power to furnace.
9. Recheck temperature rise.
Electronic Ignition
The integrated control has an added feature of an internal
control. The feature serves as an automatic reset device
for integrated control lockout caused by ignition failure.
This type of lockout is usually due to low gas line pressure.
After one hour of continuous thermostat demand for heat,
the control will break and remake thermostat demand to
the furnace and automatically reset the integrated control
to begin the ignition sequence.