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506244-01G / 49-5000677Issue 2205Page 4 of 7
12. If the appliance will not operate, follow the section
“Turning O󰀨 Gas to the Unit” and call your licensed
professional service technician (or equivalent.).
Turning O󰀨 Gas to the Unit
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 heating compartment access panel.
4. Move switch on gas valve to the OFF position.
5. Replace the heating compartment access panel.
Negative Air
Pressure
Sensing Port
Positive Air
Pressure
Sensing Port
Figure 1. Gas Valve
Filters
All lters are installed external to the unit. Filters should
be inspected monthly. Clean or replace the lters when
necessary to ensure proper furnace operation.
Replacement lters must be rated for high velocity airow.
Table 1 lists recommended lter sizes. A lter must be in
place when the unit is operating.
Furnace Cabinet
Width
Filter Size
Side Return Bottom Return
14-1/2”
16 x 25 x 1 (1)
14 x 25 x 1 (1)
17-1/2” 16 x 25 x 1 (1)
21” 20 x 25 x 1 (1)
24-1/2” 16 x 25 x 1 (2) 24 x 25 x 1 (1)
Table 1.
Maintenance
A licensed professional service technician (or equivalent)
should inspect the complete system each season (heating
and cooling). The following maintenance procedures
should only be conducted by a licensed professional
service technician (or equivalent). Do not attempt to
service the unit in any way.
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 controls, 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.
WARNING
Annually (before heating season) inspect furnace venting
system, vent cap, heat exchanger, and burners for
corrosion, deterioration, or deposits of debris. Remove any
obstructions.
During a seasonal check the service technician will conduct
a combustion analysis. The technician will also inspect the
indoor blower, burner ames, electrical connections and
the venting system.
Venting System
ASPHYXIATION HAZARD
The exhaust vent for this furnace must be leak-free and
must be securely connected to the furnace ue collar at
all times.
For your safety and to fulll the terms of the limited
warranty, a licensed professional service technician (or
equivalent) must annually inspect this furnace and its
vent system.
WARNING
Inspect the furnace for obvious signs of deterioration.
Inspect the furnace venting system to make sure it is in
place, physically sound, and without holes, corrosion, or
blockage.