Operating instructions
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To Begin Component Self-Test:
Blower access panel door switch opens 115-v power to
control. No component operation can occnr. Caution must be
taken when manually closing this switch for smwice purposes.
Failure to follow this warning could result in electrical shock,
personal iniury, or death.
i. Remove blower access door.
2. Disconnect the thermostat R lead from furnace control.
3. Manually close blower door switch.
4. For approximately 2 sec, short (iumper) the COM-24V terminal
on control to the TEST/TWIN 3/16-inch quick-connect termi-
nal on control until the LED goes of£ Remover jumper from
terminals. (See Fig. 31.)
NOTE: If TEST/TWIN and COM-24V terminals are jumpered
longer than 2 sec, LED will flash rapidly and ignore component
test request.
Component test sequence is as follows:
a. LED will display previous stares code 4 times.
b. Inducer motor starts and continues to run until Step g of
component test sequence.
c. After 7 seconds the hot suri_ace igniter is energized for 15
sec., then of£
d. Blower motor operates on Continuous-FAN speed for I0
sec.
e. Blower motor operates on HEAT speed for 10 sec.
f. Blower motor operates on COOL speed for I0 sec.
g. Inducer motor stops.
5. Reconnect R lead to furuace control, remove tape l'rom blower
door switch, and re-install blower door.
6. Operate furuace per instruction on outer door.
7. Verify furuace shut down by lowering thermostat setting
below room temperature.
8. Verify that furuace restarts by raising thermostat setting above
roolI1 temperature.
START-UP PROCEDURES
Step 1--General
i. Furnace must have a 115-v power supply properly connected
and grounded.
NOTE: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control LED status indicator will flash rapidly
and furnace will not operate.
2. Thermostat wire connections at terminals R, W, G, and Y/Y2
nmst be made at 24-v terminal block on furnace control.
3. Natural gas selwice pressure must not exceed 0.5 psig (14-in.
wc), and be no less than 0.16 psig (4.5-in. wc).
4. Blower access panel must be in place to complete l15-v
electrical circuit to furuace.
These furnaces are equipped with a manual reset limit switch
in burner box. This switch will open and shut offpower to gas
valve if an overheat condition (flame rollout) occurs in buruer
enclosure. Correct inadequate combustion-air supply or im-
proper venting condition and reset switch. DO NOT jumper
this switch.
Before operating furnace, check flame roll-out manual reset switch
for continuity. If necessary, press button to reset switch.
Step 2--Prime Condensate Trap With Water
Condensate trap must be PRIMED or proper draining may not
occur. The condensate trap has 2 intemal chambers which can
ONLY be primed by pouring water into the inducer drain side
of condensate trap.
i. Remove upper inducer housing drain connection cap. (See
Fig. 55.)
\
A99118
Fig. 55--Inducer Housing Drain Tube Cap
2. Connect field-supplied ii2-in. ID robe to upper inducer
housing drain connection.
3. Insert field-supplied funnel into robe.
4. Pour 1 quart of water into l'unnelimbe. Water should run
through inducer housing, overfill condensate trap, and flow
into open field drain. (See Fig. 56.)
5. Remove funnel and robe from inducer housing and replace
drain connection cap and clamp.
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