Operating Instructions; To Turn Off The Appliance; Furnace Maintenance - User Information; External Air Filters - Johnson Controls LP9C User's Information Manual

1010352-UUM-G-0615

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 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.
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.
External Manual
Shutoff Valve
To Gas
Supply
Grounded Joint Union
Drip Leg
may be Installed
Inside or Outside Unit.
FIGURE 8: Gas Piping
Outlet
Pressure
Port
Inlet
Wrench
Boss
Inlet
Pressure
On/Off Switch
Port
(Shown in ON position)
FIGURE 9: Single Stage Gas Valve
4
To Gas
Supply
Vent Port
Outlet
Main Regulator
Adjustment
HIGH STAGE REGULATOR
ADJUSTMENT
OUTLET
PRESSURE
PORT
INLET
WRENCH
BOSS
INLET
PRESSURE
PORT
ON OFF
SWITCH
FIGURE 10: Two-Stage Gas Valve
Main
Regulator
Adjustment
Outlet
Pressure
Tap
FIGURE 11: Modulating Gas Valve
FURNACE MAINTENANCE - USER
INFORMATION
Before proceeding, be sure the area is well ventilated. Turn the ther-
mostat OFF. If the blower is running, wait until it stops automatically.
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 tem-
perature 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.
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.
If during the inspection of your furnace, you find any of the following
conditions:
• Excessive amounts of dust and lint on components.
• Damaged or deteriorated components or surfaces.
• Leaks or blockage in the vent pipe passages.
• Water on any surface inside or outside of the furnace.
VENT
PORT
OUTLET
LOW STAGE REGULATOR
ADJUSTMENT
Inlet
On/Off
Pressure
Switch
Tap
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