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 Figures 8, 7 or 8.
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 Figures 8, 7 or 8.
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
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 8, 7 or 8.
5.Replace furnace burner access panel/door.
Should overheating occur, or the gas valve fail to shut off, turn the external manual gas valve in the gas supply line to the fur- nace to the “off” position and let the furnace cool off before shutting off the electrical power supply.
Outlet
Pressure 
Vent Port
Port
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Wrench | OFF |
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Boss | ON |
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FIGURE 8: Single Stage Gas Valve
HIGH STAGE REGULATOR
ADJUSTMENT
OUTLET PRESSURE
PORT
VENT PORT
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WRENCH
BOSS
INLET
PRESSURE
PORT
ON OFF | LOW STAGE REGULATOR |
SWITCH | ADJUSTMENT |
FIGURE 9:
On/Off |
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FIGURE 10: Modulating Gas Valve |
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Grounded Joint Union 
Drip Leg may be Installed
Inside or Outside Unit.
FIGURE 11: Gas Piping
SECTION IV: FURNACE MAINTENANCE - USER INFORMATION
Before proceeding, be sure the area is well ventilated. Turn the thermostat OFF. If the blower is running, wait until it stops auto- matically. Turn OFF the gas and electrical power supplies to the furnace. Check all metal parts and surfaces to be sure they have cooled to room temperature before you begin.
EXTERNAL AIR FILTERS
Filters used with this furnace must be installed external to the furnace casing. DO NOT attempt to install filters inside the furnace cabinet.
Some installations may have the air filter in a rack attached to the cas- ing of the furnace or placed in the return air duct. If the filter location or replacement process is not obvious, contact your installer or service technician for assistance.
4 | Johnson Controls Unitary Products |
