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!
Should overheating occur or the gas supply fail to shut off,
shut off the manual gas valve to the unit before shutting off
the electrical supply. Failure to do so can result in an
explosion or fire causing property damage, severe personal
injury or death!
Burners
Burners for these units have been designed so that field
adjustment is not required. Burners are tray-mounted and
accessible for easy cleaning when required.
Manual Reset Overtemperature Control
Two manual reset overtemperature controls are located on the
burner shield. These devices senses blockage in the heat
exchanger or insufficient combustion air. This shuts off the
main burners if excessive temperatures occur in the burner
compartment.
Operation of this control indicates an abnormal condition.
Therefore, the unit should be examined by a qualified installer,
service agency, or the gas supplier before being placed back
into operation.
▲ ▲
!
DO NOT JUMPER THIS DEVICE! DO NOT reset the
overtemperature control without taking corrective action to
assure that an adequate supply of combustion air is
maintained under all conditions of operation. Failure to do
so can result in carbon monoxide poisoning or death.
Replace this control only with the identical replacement part.
Pressure Switch
This furnace has a pressure switch for sensing a blocked
exhaust or a failed induced draft blower. It is normally open
and closes when the induced draft blower starts, indicating air
flow through the combustion chamber.
Limit Control
The supply air high temperature limit cut-off is set at the
factory and cannot be adjusted. It is calibrated to prevent the
air temperature leaving the furnace from exceeding the
maximum outlet air temperature.
IMPORTANT: Replace this control only with the identical
replacement part.
▲ ▲
!
Do not jumper this device! Doing so can cause a fire or
explosion resulting in property damage, personal injury or
death.
IM 861
DANGER
DANGER
DANGER
System Operating Information
Advise The Customer
1 Change the air filters regularly. The heating system
operates better, more efficiently and more economically.
2 Except for the mounting platform, keep all combustible
articles three feet from the unit and exhaust system.
3 IMPORTANT: Replace all blower doors and
compartment cover after servicing the unit. Do not operate
the unit without all panels and doors securely in place.
4 Do not allow snow or other debris to accumulate in the
vicinity of the unit.
Furnace Section
Maintenance
The unit's furnace should operate for many years without
excessive scale build-up in flue passageways; however, it is
recommended that a qualified installer, service agency, or the
gas supplier annually inspect the flue passageways, the
exhaust system and the burners for continued safe operation,
paying particular attention to deterioration from corrosion or
other sources.
If during inspection the flue passageways and exhaust system
are determined to require cleaning, the following procedures
should be followed (by a qualified installer, service agency,
or gas supplier):
1 Turn off the electrical power to the unit and set the
thermostat to the lowest temperature.
2 Shut off the gas supply to the unit either at the meter
or at manual valve in the supply piping.
▲ ▲
!
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation resulting in fire, electrical shock, property
damage, personal injury or death.
3 Remove the furnace controls access panel and the control
box cover.
4 Disconnect the gas supply piping from the gas valve.
5 Disconnect the wiring to the induced draft blower motor,
gas valve, flame sensor, and flame roll-out control, and
ignitor cable. Mark all wires disconnected for proper
reconnection.
6 Remove the screws (4) connecting the burner tray to the
heat exchanger mounting panel.
7 Remove the burner tray and the manifold assembly from
the unit.
8 Remove the screws (5) connecting the induced draft
blower to the collector box and screws (18) connecting the
collector box to the heat exchanger center panel. Remove
the induced draft blower and the collector box from the
unit.
DANGER
17
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