356486-UUM-J-1211
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.
,AWARNING
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.
External Manual
Shutoff Valve
To Gas To Gas
Supply Supply
Drip Leg
\ /
Grounded Joint Union
may be Installed
Inside or Outside Unit.
FIGURE 8: Gas Piping
Outlet ._:L_ _
Pressure .... [-__ _-_'_ _ Vent Port
Port I I
Inlet L-- *-°u"et
Wrench _
Boss / _ '
Inlet / _[Q_.Z____.J Main Regulator
Pressure Adjustment
Port On/Off ;witch
(Shown in ON position)
FIGURE 9: Single Stage Gas Valve
OUTLET
PRESSURE
PORT
INLET--_
HIGH STAGE REGULATOR
ADJUSTMENT
VENT
PORT
OUTLET
BOSS
INLET
PRESSURE
PORT
ON OFF
SWITCH
LOW STAGE REGULATOR
ADJUSTMENT
FIGURE 10: Two-Stage (PSC & ECM) Gas Valve
Inlet --
Pressure
Tap
Main
j Regulator
Adjustment
_ Outlet
Pressure
Tap
FIGURE 11: Modulating (PSC)Gas Valve
Main Inlet
Pressure
Adjustment Tap
Outlet
Pressure
Tap
]
FIGURE 12: Modulating (ECM) Gas Valve
SECTION IV: FURNACE MAINTENANCE -
USER INFORMATION
AWARNING
Before proceeding, be sure the area is well ventilated. Turn the
thermostat OFF. If the blower is running, waft 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
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