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035-19699-001-B-0804

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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.

Summary of Contents for Thermostat

Page 1: ...FORE CALLING A SERVICE PERSON 7 REPLACEMENT PARTS 8 The manufacturer recommends that the User read all sections of this manual and keep the manual for future reference FIRE OR EXPLOSION HAZARD Failure...

Page 2: ...pply 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 ser...

Page 3: ...his 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 clos...

Page 4: ...s or other debris If any soot is found it is rec ommended a qualified service technician be called immediately If any blockage is found it must be cleared immediately Check for obvious signs of deteri...

Page 5: ...s 7 Brush out the inside of the flue collector box and the flue baffles 8 Run the wire brush down the vent hoods from the flue collector end 9 If soot build up is particularly bad remove the vent moto...

Page 6: ...RS Outdoor fan motors are permanently lubricated and require no maintenance Ventor motor is factory lubricated for an estimated 10 year life Indoor Blower Motor and Drive The indoor blower motor featu...

Page 7: ...ly dirty a hose can be used to wash the coil from the inside out while brushing a soapy solution on the outside REGISTERS Supply and return air registers must be open when the unit is in operation Obs...

Page 8: ...19036 000 DM180 035 19697 000 DH180 035 19413 000 DR180 SINGLE PACKAGE AIR CONDITIONER GAS ELECTRIC 20 TON REPLACEMENT PARTS FORM No RESPECTIVE MODEL No 035 18898 000 DJ240 1 035 19799 000 DJ240 2 03...

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