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Start-Up & Operation Information
NOTE -
When the furnace begins heating mode, the di
agnostic LED on the furnace control will display "H1"
for heating operation in 1st stage, or "H2" for heating
operation in 2nd stage. The LED can be seen through
the viewport on the lower access panel. See figure 2.
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
BEFORE PLACING THE UNIT INTO OPERATION, smell
all around the appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than air and will
settle on the floor.
The gas valve on the SL297UHNV will be equipped with a
gas control switch. Use only your hand to move the
switch. Never use tools. If the switch will not move by
hand, do not try to repair it. Call a licensed professional
service technician (or equivalent). Force or attempted re
pair may result in a fire or explosion.
Furnace Integrated Control
HUM
FLAME
SENSE
S1
12345
6
7
8
ON
91
1
13
15
10
12
14
ON
R
CR
C
I+ I−
I+ I−
W1W2
OUTDOOR EQUIPMENT
INDOOR EQUIPMENT
FIGURE 2
Placing the SL297UHNV furnace into operation:
SL297UHNV units are equipped with an ignition system.
Do not attempt to manually light burners on this furnace.
Each time the thermostat calls for heat, the burners will
automatically light. The ignitor does not get hot when
there is no call for heat on units with this ignition system.
HSI/CAI
ACC
15
L1
DIAGNOSTIC
LED
14
SureLight
®
3
6
11
4
7
0
3
12
CUT FOR
OPTION
SELECTION
W915
2 STAGE
COMPR
W951
HEAT
PUMP
W914
DEHUM
HARMONY
G
Y1 CC
R
DH LODS
Y2
Operating the Gas Valve (Figure 3)
1 - STOP! Read the safety information at the beginning of
this section.
2 - Set the thermostat to the lowest setting.
3 - Turn off all electrical power to the unit.
4 - This furnace is equipped with an ignition device which
automatically lights the burners. Do not try to light the
burners by hand.
5 - Remove the upper access panel.
6 - Move switch on gas valve to OFF. See figure 3.
7 - Wait five minutes to clear out any gas. If you then smell
gas, STOP! Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's instruc
tions. If you do not smell gas go to next step.
8 - Move switch on gas valve to ON. See figure 3.
GAS VALVE SHOWN IN THE ON POSITION
9 - Replace the upper access panel.
10 - Turn on all electrical power to to the unit.
11 - Set the thermostat to desired setting.
NOTE - When unit is initially started, steps 1 through 11
may need to be repeated to purge air from gas line.
12 - If the appliance will not operate, follow the section
"Turning Off Gas to the Unit" and call your licensed
professional service technician (or equivalent).
Turning Off Gas to the Unit
If overheating occurs or if gas supply fails to shut off,
shut off the manual gas valve to the furnace before
shutting off electrical supply.
1 - Set the thermostat to the lowest setting.
2 - Turn off all electrical power to the unit if service is to be
performed.
3 - Remove the upper access panel.
4 - Move switch on gas valve OFF.
5 - Replace the upper access panel.
Do not set thermostat below 60°F (16°C) in heating
mode. Setting thermostat below 60°F (16°C) reduces
the number of heating cycles. Damage to the unit
may occur that is not covered by the warranty.
Page 4
FIGURE 3
WARNING
CAUTION
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