7
AI
R
FLO
W
12
34
56
78
Burner
Assembly
Finish
Flange
Igniter
Roll-Out
Switch
Gas Valve
Furnace
Control Board
Condensate
Pressure
Switches
Transformer
Motor
Control
Board
Blower
Assembly
Motor Choke
(C & D cabinets only)
Blower Door
Switch
Inducer
Assembly
Inducer
Pressure
Switches
Motor
Control Box
Inducer
Limit Switch
Main Air
Limit Switch
Burner
Assembly
Flame
Sensor
Roll-Out
Switch
Finish
Flange
Blower Assembly
(behind blower panel)
Blower
Door Switch
(behind blower panel)
Motor Choke
(C & D cabinets only)
Gas
Manifold
Gas Valve
Igniter
Inducer
Assembly
Inducer Limit
Switch
Main Air
Limit Switch
Furnace
Control
Board
Motor
Control
Board
Pressure
Switches
Transformer
FLOW
AIR
J952V*U
Upflow / Horizontal
Condensing Gas Furnace
J962V*D
Downflow
Condensing Gas Furnace
Flame
Sensor
Gas
Manifold
COMPONENT LOCATIONS FOR TWO-STAGE FURNACES
STARTING THE FURNACE
1. Make sure the filter is clean and in place.
2. Make sure the vent system is properly installed.
3. Set the thermostat to the lowest setting.
4. Close the manual gas valve outside the furnace.
5. Turn off all electric to the furnace.
6. Remove the door from the burner compartment.
7. Set the gas valve switch or knob to the OFF position.
See Figure 1 for gas valve switch or knob location.
8. Wait 5 minutes. If there is any smell of gas, see “WHAT
TO DO IF YOU SMELL GAS” on page 4.
9. Set the gas valve switch or knob to the ON position.
10. Turn on all electric to the furnace.
11. Open the manual gas valve.
12. Turn the thermostat back up to force ignition.
13. Observe operation, including burners. If burners fail to
ignite, call a licensed HVAC technician.
14. Replace the door on the burner compartment.
Figure 1. Gas Valves
SINGLE STAGE VALVE
TWO - STAGE VALVE
STARTUP & SHUTDOWN
SHUTTING DOWN THE FURNACE
IMPORTANT! IF YOU NEED TO SHUT DOWN YOUR
FURNACE FOR SERVICE OR MAINTENANCE, SHUT OFF
THE GAS VALVE TO THE FURNACE BEFORE TURNING
OFF THE ELECTRICAL SERVICE.
NOTE:
Your furnace may be equipped with one of three
types of gas valves. Remove the door panel from the front
of the furnace and determine which valve type matches your
installation in Figure 1. Move the switch to the OFF Position.
If your installation has a manual gas shutoff valve on the
gas supply pipe, shut this off, then shut off the electric to
the furnace.
1. Set the thermostat to the lowest setting.
2. Close the manual gas valve outside the furnace.
3. Turn electric to the furnace off.
4. Open the door to the burner compartment.
5. Set the gas valve switch or knob to the OFF position.
6. Replace the door on the burner Compartment.
