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Y-UIM, User's Maintenance and Service Info. Manual, Sgl Pkg AC Gas/Elec
USERS, MAINTENANCE and
SERVICE INFORMATION
MANUAL
SINGLE PACKAGE
AIR CONDITIONER
GAS/ELECTRIC
035-18843-004-A-0204
CONTENTS
SAFETY INFORMATION . . . . . . . . . . . . . . . . 2
FOR YOUR SAFETY . . . . . . . . . . . . . . . . . . . . . . . 2
SYSTEM OPERATION . . . . . . . . . . . . . . . . . . 2
THERMOSTATS . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INTERMITTENT IGNITION DEVICE . . . . . . . . . . . 2
INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
OPERATING INSTRUCTIONS. . . . . . . . . . . . . . . . 3
TO SHUT DOWN THE FURNACE: . . . . . . . . . . . . 3
TO LIGHT THE FURNACE: . . . . . . . . . . . . . . . . . . 3
VENT SAFETY SYSTEM: . . . . . . . . . . . . . . . . . . . 3
100% SHUT OFF: . . . . . . . . . . . . . . . . . . . . . . . . . 3
EXPLAIN UNIT FUNCTION . . . . . . . . . . . . . 4
GENERAL MAINTENANCE . . . . . . . . . . . . . . 4
HEATING SYSTEM INSPECTION . . . . . . . . . . . . . 4
BURNER AND PILOT CHECK . . . . . . . . . . . . . . . . 4
CLEANING BURNERS . . . . . . . . . . . . . . . . . . . . . 5
CLEANING FLUE PASSAGES AND
HEATING ELEMENTS . . . . . . . . . . . . . . . . . . . . 5
AIR FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
BLOWER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . 6
MOTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CONDENSER COIL . . . . . . . . . . . . . . . . . . . . . . . . 6
REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . 6
BEFORE CALLING A SERVICE
TECHNICIAN: . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
REPLACEMENT PARTS . . . . . . . . . . . . . . . . 7
The manufacturer recommends that the User read all sections of this
manual and keep the manual for future reference.
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly
could result in serious injury, death, or
property damage.
- Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS: Do not try to light any appliance. Do not touch any electrical switch; do not
use any phone in your building. Leave the building immediately. Immediately call your gas supplier from a
neighbors phone. Follow the gas sup-
pliers instructions. If you cannot reach your gas supplier, call
the fire department.
- Installation and service must be per-
formed by a qualified installer, service
agency or the gas supplier.
® 035-18843-004-A-0204
2
Unitary Products Group
SAFETY INFORMATION
FOR YOUR SAFETY

Make sure that the furnace area is clear and free of
combustible materials, gasoline and other flamma-
ble vapors and liquids. Be sure the furnace is free and clear of insulating
material. Examine the furnace area after installa-
tion of the furnace or the installation of additional
insulation. Some types of insulation are combusti-
ble. For proper operation of this furnace, air for com-
bustion and ventilation is required. Make sure that
these openings are not obstructed. For lighting or shutting down this furnace, refer to
the lighting instructions provided adjacent to the
burners and also located in this manual. A blocked vent roll-out switch is provided in the
burner compartment. This switch is a manual reset.
If the furnace fails to operate, contact a qualified
service technician. Should the gas supply fail to shut off or if overheat-
ing occurs, shut off the gas valve to the furnace
before shutting off the electrical supply. Then call a
qualified service technician. Do not use this furnace if any part has been under
water. A flood-damaged furnace is extremely dan-
gerous. Attempts to use the furnace can result in
fire or explosion. A qualified service technician
should be contacted to inspect the furnace and to
replace all gas controls, control system parts, elec-
trical parts that have been wet or the furnace if
deemed necessary. Determine the integrity of the installation regarding
the flue gas vent, the return and supply air duct.
Confirm the equipment is well supported and there
are no signs of deterioration. The manufacturer
recommends that main burner, ignition device and
controls are inspected by a qualified service techni-
cian before each heating season.

SYSTEM OPERATION
THERMOSTATS
Set your thermostat for either heating or cooling then
set it for the desired temperature. DO NOT MOVE THE
THERMOSTAT RAPIDLY ON AND OFF, OR BACK
AND FORTH FROM HEAT TO COOL. THIS COULD
DAMAGE YOUR EQUIPMENT.
Always allow at least 5 minutes between changes. Find
the temperature that is most comfortable to you, and
then LEAVE YOUR THERMOSTAT ALONE. (Excep-
tion is for night or vacation set back to conserve
energy).
Manually moving the thermostat up or down will not
speed up temperature changes in your rooms. This
only causes the thermostat switch to function at your
command rather than responding to room temperature.
Heat generated by devices other than the furnace may
interfere with thermostat performance. Therefore,
lamps, radios, television sets, etc. should not be placed
near the thermostat.
INTERMITTENT IGNITION DEVICE
Your unit is equipped with a cycling pilot burner. It has a
Pilot Relight control designed to automatically light the
pilot burner each time the thermostat calls for heat.
When the thermostat calls for heat, pilot gas is supplied
and at the same time, sparking occurs to light the pilot
gas. With the pilot lit, the flame sensor rod closes a cir-
cuit to the ignitor control which then opens the gas
valve to admit main burner gas.
FIGURE 1 - TYPICAL THERMOSTAT
This furnace is equipped with an intermittent pilot and
automatic re-ignition system.
Do Not
attempt to man-
ually relight the pilot. Personal injury could result. 035-18843-004-A-0204
Unitary Products Group
3
When the room thermostat is satisfied, the electrical
circuit to the gas valve is opened, closing off both main
burner and pilot gas simultaneously. If the pilot burner
should fail to light, contact your heating contractor or
gas utility for service to insure that proper operating
conditions are restored.
INPUT
The correct heat capacity of the furnace is regulated by
the burner orifices and the gas pressure. The proper
orifices are furnished but the gas pressure regulator
must be adjusted by the installer or gas utility service
technician.
OPERATING INSTRUCTIONS
TO SHUT DOWN THE FURNACE:
1. Close the main gas shutoff valve(s).
2. Turn off the electric power supply.
TO LIGHT THE FURNACE:
1. Do not attempt to light manually.
2. Open the main gas shutoff valve(s).
3. Adjust the set point of the room thermostat above
the temperature in the space.
4. Turn on the electric power supply.
5. The draft fan will operate. After an adequate purge
time, the electric spark igniter will light the burners.
6. The burners will extinguish and relight automati-
cally upon the demand of the room thermostat.
VENT SAFETY SYSTEM:
This gas furnace is equipped with an automatic reset
high temperature sensor or rollout switch which in the
unlikely event of a sustained main burner flame rollout
will shut off the flow of gas by closing the main gas
valve. The ignition modules will also be disabled, pre-
venting the flow of gas to the valves. The switch is
located inside the gas heat access panel above the
burner inlet. Flame rollout can be caused by blockage
of the power vent system, improper gas pressure or
adjustment. If this event occurs the furnace will not
operate properly, gas supply to the furnace should be
shut off and no attempt should be made to place the
furnace in operation. The system should be inspected
by a qualified service technician. Refer to Figure 2 for a
typical installation.
100% SHUT OFF:
The ignition modules are designed for 100% shut-off. If
the furnace fails to ignite within 85 seconds after a call
for heat, the flow of gas (including pilot) will be shut off
and the ignition module will lock out. The module can
be reset by:
A. Turning the system switch on the room thermostat
to the OFF position and back to the HEAT posi-
tion.
B. Decreasing the set point of the room thermostat
below the temperature in the conditioned space
and returning it to its original setting.
C. Opening and closing the unit's main disconnect
switch.
FIGURE 2 - TYPICAL INSTALLATION 035-18843-004-A-0204
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Unitary Products Group
If the furnace continues to lock out, a qualified service
technician should be called to determine the cause of
the problem.

EXPLAIN UNIT FUNCTION
When the system is functioning properly, show the
owner the location of all disconnect switches and the
thermostat. Explain how to start and stop the unit a