Service manual

129099-UUM-F-0507
2 Unitary Products Group
7. NEVER…Store cleaning materials near your furnace. Materials
such as bleaches, detergents, powdered cleansers, etc., can
cause corrosion of the heat exchangers.
8. NEVER
…Use the area around your furnace as a storage area for
items which could block the normal flow of air. This flow of air is
required for ventilation of the various furnace components.
While you are away
Your furnace is equipped with a safety device which will shut off the
supply of gas to the burner in case of malfunction. For this reason it is
never practical to assume that the furnace will operate unattended for a
long period of time, especially if there is a possibility of damage to your
property because of freezing. So, if you plan to be away from home,
arrange for someone to check your house every day.
SEASONAL SERVICE INFORMATION
During extreme cold weather, ice may form on the furnace roof jack
crown. Small amounts of ice forming on the roof jack will present no
problem to proper furnace operation. However, excessive ice formation
could restrict the combustion air supply to the burner causing inefficient
burner operation.
When the temperature is very cold, near zero or below, it is recom-
mended that the roof jack be inspected every day or more frequently if
required. If ice has started to collect on the roof jack crown, it should be
carefully broken off.
Your Service Technician
Your furnace's best friend is your qualified service technician. If the unit
gives any indication of improper operation, call your service technician.
If the service technician is allowed to perform the normal routine care of
your furnace, he can many times detect potential difficulties and make
corrections before trouble develops. Preventative maintenance of this
type will allow you to operate the unit with a minimum of concern, and at
the same time will pay for itself in added years of comfort.
DESCRIPTION
This furnace shall be installed in the downflow position. Figure 1 shows
a typical model in the downflow position. The furnace is equipped with
an induced-draft vent blower and atmospheric burner. Combustion air is
drawn through the roof jack and pushed into the burner box. Flue gas is
forced from the heat exchanger by the vent blower and discharged
through the flue pipe to the outside atmosphere.
This is a forced air furnace. The furnace circulating air blower draws
cool air from the house, passes it over the hot furnace heat exchanger
and circulates the warmed air through the ductwork to the house.
The furnace is equipped with the controls necessary for proper opera-
tion. The various components referred to in this manual and on the fur-
nace rating plate are identified in Figure 1.
WARRANTY AND RESPONSIBILITIES
It is the sole responsibility of the home owner to make certain that the
gas furnace has been correctly set up and converted to the proper fuel
(Propane or Natural gas) and adjusted to operate properly.
The manufacturer warrants the furnace to be free from defects in mate-
rial or workmanship for the stated time in the warranty agreement (see
warranty certificate packed with the furnace).
However, the manufacturer will not be responsible for any repair costs
to correct problems due to improper set-up, improper installation, fur-
nace adjustments, improper operating procedure by the user, etc.
It is also the sole responsibility of the home owner to make sure that the
home if located above 2,000 ft. altitude be derated.
Some specific examples of service calls which cannot be included in
warranty payments are:
1. Converting the furnace to use another type of fuel.
2. Correcting faulty duct work in the home.
3. Correcting wiring problems in the electrical circuit to the furnace.
4. Resetting circuit breakers or other switches.
5. Adjusting the burner air shutter or service calls made to correct
problems caused by improper air adjustment.
6. Correcting problems caused by improper gas supply pressure to
the furnace.
7. Instructional training on how to light and operate furnace.
8. Furnace problems caused by installation of air conditioner, heat
pump, or other air quality device.
9. Problems caused by improper installation of the furnace flue
assembly (roof jack).
10. Adding a roof jack extension because of unusual wind conditions
or snow conditions.
11. Adjusting thermostats.
12. Problems caused by construction debris which has fallen into the
flue or combustion air openings.
13. Replacement of fuses.
14. Problems caused by plugged or restricted orifices by any means.
You should establish a firm understanding of these responsibilities with
your manufactured housing dealer, service company or gas supplier so
there will be no misunderstanding at a later time.
FIRE OR EXPLOSION HAZARD
This furnace is designed and approved for use with Natu-
ral Gas and (LP) Propane Gas ONLY. DO NOT BURN ANY
LIQUID FUEL OR SOLID FUEL IN THIS FURNACE.
Burning any unapproved fuel will result in damage to the
furnace heat exchanger, which could result in Fire, Per-
sonal Injury, and/or Property Damage.
FIGURE 1: Component Locations
VENT PIPE
PRESSURE
SWITCH
SILICONE
TUBE
GAS VALVE
BOOSTER DRAFT
ASSEMBLY
SAFETY SHUTOFF
SWITCH
CONTROL
BOARD
FLUE
COLLAR
BLOWER
COMBUSTION
AIR PIPE
AIR CONDITIONING
COIL PANELS
BLOWER
MOTOR
BLOWER MOTOR
CAPACITOR
GAS BURNER
ASSEMBLY