Use and Care Manual

1010352-UUM-J-0818
4 Johnson Controls Unitary Products
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above for your protection.
2. Set the thermostat to the lowest setting in the heat mode.
3. Turn off all electric power to the appliance.
4. Remove furnace burner access panel/door.
5. Move gas control switch to the OFF position. Do not force. See Fig-
ures 7-9.
6. Wait five (5) minutes to clear out any gas. If you then smell gas,
STOP! Follow “B” in the safety information above. If you don’t smell
gas, go to next step.
7. Move gas control switch to the ON position. Do not force. See Fig-
ures 7-9.
8. Replace furnace burner access panel/door.
9. Turn on all electric power to the appliance.
10. Set thermostat to the desired setting. Burner will light, which may
take 30-60 seconds.
11. After three (3) trials for ignition, if the appliance will not operate fol-
low the instructions, “TO TURN OFF THE APPLIANCE” and call
your service technician or gas supplier.
TO TURN OFF THE APPLIANCE
1. Set the thermostat to lowest setting in heating mode.
2. Turn off all electric power to the appliance if service is to be per-
formed.
3. Remove furnace burner access panel/door.
4. Move gas control switch to the “OFF” position. See Figures 7-9.
5. Replace furnace burner access panel/door.
WARNING
Should overheating occur, or the gas valve fail to shut off, turn the
external manual gas valve in the gas supply line to the furnace to the
“off” position and let the furnace cool off before shutting off the electri-
cal power supply.
FIGURE 6: Gas Piping
!
External Manual
Shutoff Valve
To Gas
Supply
To Gas
Supply
Grounded Joint Union
may be Installed
Inside or Outside Unit.
Drip Leg
FIGURE 7: Single Stage Gas Valve
FIGURE 8: Two-Stage Gas Valve
FIGURE 9: Modulating Gas Valve
Inlet
Wrench
Boss
Inlet
Pressure
Port
ON
OFF
On/Off Switch
(Shown in ON position)
Main Regulator
Adjustment
Outlet
Outlet
Pressure
Port
Vent Port
INLET
WRENCH
BOSS
INLET
PRESSURE
PORT
ON OFF
SWITCH
LOW STAGE REGULATOR
ADJUSTMENT
OUTLET
OUTLET
PRESSURE
PORT
VENT
PORT
HIGH STAGE REGULATOR
ADJUSTMENT
Inlet
Pressure
Tap
Outlet
Pressure
Tap
On/Off
Switch
Main
Regulator
Adjustment