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Fan Control
Fan On Delay
The heat fan on time of 30 seconds is not adjustable. The
cool fan on delay is 2 seconds and not adjustable.
Fan Off Delay
Ignition Control 103217-03
The heat fan off delay (amount of time that the blower
operates after the heat demand has been satisfied) may
be adjusted by changing the jumper position across the
five pins on the integrated control. The unit is shipped with
a factory fan off setting of 90 seconds. The fan off delay
affects comfort and is adjustable to satisfy individual ap-
plications. 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 pro-
vide lower return air temperatures; shorter settings pro-
vide higher return air temperatures. See FIGURE 64. The
cool fan off delay (amount of time that the blower operates
after the cool demand has been satisfied) is 45 seconds
and not adjustable.
HEAT FAN OFF TIME IN SECONDS
NO JUMPER
To adjust fan-off timing, reposition jumper across pins to
achieve desired setting.
60 Second
90 Second
off Time
off Time
FIGURE 64
Ignition Control 107163-01
The heat fan-on time of 30 seconds is not adjustable The
heat fan-off delay (amount of time that the blower oper-
ates after the heat demand has been satisfied) may be
adjusted by changing the two position dip switch on the
integerated control, to one of four slections. Blower off de-
lay is factory set at 90 seconds. For other blower off delay
settings, please refer to the following chart:
Blower Delay Select
60
90
120
180
Factory Setting is 90
120 Second
180 Second
off Time
off Time
SW2-1
SW2-2
OFF
ON
OFF
OFF
ON
OFF
ON
ON
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 Product Specifications Bulletin for blower
performance data. See TABLE 15 on page 54 for
allowable heating speeds.
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
Watchguard control. The feature serves as an automat-
ic 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 Watchguard will break and remake
thermostat demand to the furnace and automatically reset
the integrated control to begin the ignition sequence.
Service
ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly could result in
dangerous operation, serious injury, death or property
damage.
Improper servicing could result in dangerous operation,
serious injury, death, or property damage. Before
servicing, disconnect all electrical power to furnace.
When servicing controls, label all wires prior to
disconnecting. Take care to reconnect wires correctly.
Verify proper operation after servicing.
The blower access panel must be securely in place when
the blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into living
space resulting in personal injury or death.
Page 48
WARNING
WARNING
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