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TABLE 10—SETUP SWITCH DESCRIPTION
SETUP
SWITCH NO.
NORMAL
POSITION
DESCRIPTION OF USE
SW-1
(FLT)
OFF
Turn switch to ON for fault history display. No thermostat signal can be
present for fault history display.
SW-2
(LOW)
OFF Turn switch to ON to lock furnace in low-heat mode only.
SW-3
(BPH)
OFF
Turn switch to ON when a bypass humidifier is used. This compensates
for higher return-air temperature and provides 5 percent more airflow in
low-heat mode only.
SW-4
(EMER HEAT)
OFF
Turn switch to ON to bypass microprocessor control. Furnace will oper-
ate at high heat only with main blower and inducer motor operating at
maximum RPM. NO safeties are bypassed.
SW-5
(MZ)
OFF
Turn switch to ON when modulating dampers are used. In this mode,
main blower speed is recalculated once every minute while furnace is in
low-heat or continuous fan mode.
SW-6
(COMP TEST)
OFF
Turn switch to ON to initiate component test. Furnace will operate in-
ducer motor for 20 sec at low speed, operate inducer motor for 20 sec at
high speed, energize HSI for 15 sec, operate blower for 20 sec at low
speed, and operate blower for 20 sec at high speed. SW-1 must be in
OFF position. No thermostat signal can be present for component test to
be initiated.
SW-7 and -8
(Blower Off Delay)
See Table 11
Adjust switches to provide desired heating mode blower off delay time,
90, 135, 180, or 225 sec.
TABLE 11—BLOWER OFF DELAY SETUP SWITCH
POSITION
DESIRED HEATING
MODE BLOWER
OFF DELAY (SEC)
SETUP SWITCH (SW-7 AND -8) POSITION
SW-7 SW-8
90 OFF OFF
135 ON OFF
180 OFF ON
225 ON ON
Fig. 46—Inducer Housing Drain Tube
A94208
Fig. 47—Filling Condensate Trap
A94209
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