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356486-UUM-H-0609
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
Figures 9-11.
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 9-11.
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 9-11.
5. Replace furnace burner access panel/door.
SECTION IV: FURNACE MAINTENANCE -
USER INFORMATION
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.
Every time the external air filters are changed the following items should
be visually inspected:
• Check combustion air and vent pipe for blockage or leakage.
• Check all components to be sure they are in good condition and
that there are no obvious signs of deterioration.
• Check the drain lines to make sure there are no cracks or leaks.
• Check for dirt or lint on any surfaces or on components. Do not try
to clean any of the surfaces or components. Cleaning of the fur-
nace and its components must be done by a qualified service pro-
fessional.
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.
FIGURE 8: Gas Piping
FIGURE 9: Single Stage Gas Valve
External Manual
Shutoff Valve
To Gas
Supply
To Gas
Supply
Grounded Joint Union
may be Installed
Inside or Outside Unit.
Drip Leg
Inlet
Wrench
Boss
Inlet
Pressure
Port
ON
OFF
On/Off Switch
(Shown in ON position)
Main Regulator
Adjustment
Outlet
Outlet
Pressure
Port
Vent Port
FIGURE 10: Two-Stage Gas Valve
FIGURE 11: Modulating Gas Valve
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.
INLET
WRENCH
BOSS
INLET
PRESSURE
PORT
ON OFF
SWITCH
LOW STAGEREGULATOR
ADJUSTMENT
OUTLET
OUTLET
PRESSURE
PORT
VENT
PORT
HIGH STAGEREGULATOR
ADJUSTMENT
Inlet
Pressure
Tap
Outlet
Pressure
Tap
On/Off
Knob
Main
Regulator
Adjustment