GAMA Gas-Fired Furnace User's Information Manual | Page 7
In all direct vent (two pipe) instances, the vent
outlet shall be installed so as to be in the same
atmospheric pressure zone as the combustion air
intake.
2. This furnace is not designed for use with a vent
damper. Use of such a device will not improve the
efficiency of this furnace and can cause an unsafe
condition which may result in death or permanent
injury.
The vent-air intake system from your furnace may rise
vertically and terminate above the roof or horizontally
through the outside wall.
Make sure all air intake and flue product carrying areas
external to the furnace (i.e., vent terminal) are clear and
free of obstructions. The vent-air intake system and
condensate drain system is in place, is physically sound
without holes or excessive deterioration, and is installed
in accordances with the installation instructions.
Check to see that the furnace cabinet is sound and firmly
supported, without sagging. There should be no cracks
or gaps between the furnace and the base or floor, which
would permit entry of unfiltered air.
It is important that the outside area where the vent
terminates is kept clear of any obstructions which might
block or impede the venting of the furnace. Should
venting become blocked at anytime, your furnace is
equipped with a special safety control to prevent
operation of the furnace until the condition has been
corrected. Contact your dealer if you desire more
information about this safety feature.
Should any unusual conditions be observed during your
inspections, call an authorized service dealer immediately.
For proper venting terminations, see the Installation
Instructions furnished with the furnace.
Return Air
Ascertain that all return air duct connections are tight and
sealed to the furnace cabinet and that all return air grilles
or registers are located outside the space containing the
furnace.
Cleaning/Replacing the Filter
It is very important to clean or replace the air filter
regularly. Dirty filters are the most common cause of
inadequate heating or cooling performance and can
sharply increase the operational costs of your unit. In
some cases, they can double the cost. The air filter
should be inspected at least every 6 weeks and
cleaned or replaced as required.
Your furnace may use either a disposable filter,
permanent filter, electronic or high efficiency media air
cleaner. Consult filter/cleaner manufacturer for
maintenance service and static pressure drop for air
moving requirements.
Permanent filters may be replaced with disposable filters.
Refer to Table 1 when selecting the proper size and
quantity of disposable filter.
If your air distribution system has a central return air filter-
grille, you do not need a filter in your furnace.
Table 1 EXTERNAL FILTER RACK SIZE
* SIDE RETURN
BOTTOM/END RETURN
15 ½ X 25
12 X 25
15 ½ X 25
15 ½ X 25
15 ½ X 25
19 X 25
*NOT FOR USE WITH COUNTER (DOWN) FLOW MODELS
Safety Interlock Switch
The blower compartment door on your high efficiency gas
furnace is equipped with a safety interlock switch that will
automatically shut off your complete system (including
blower) once the door is removed. This is for your
personal safety. Be sure to check your furnace for proper
operation once the door or panel has been replaced.
If the system does not operate once the panel has been
replaced, try removing and replacing it once again. If the
furnace still does not operate, call your dealer for service.
Rollout Switch
This unit is equipped with a manual reset high
temperature sensor or rollout switch. In the unlikely event
of a sustained main burner flame rollout, the rollout switch
will shut off the flow of gas by closing the main gas valve.
The switch is located inside the gas burner area. Flame
rollout can be caused by blockage of the power vent
system, a blocked heat exchanger, or improper gas
pressure or adjustment. If this event occurs, the unit will
not operate properly. The gas supply to the unit should
be shut off and no attempt should be made to place it
in operation.
The system should be inspected by a
qualified service technician.
Lubrication
Lubrication of the bearings in the circulating air blower
motor and the combustion blower motor is not
recommended.
Burner Flame
While the furnace is in operation, observe the main
burner flames. Compare these observations to Figure 3
to determine if proper flame adjustment is present. If
your observations indicate improper flame adjustment, call
your authorized service dealer for service.
20558901
Issue 0442
Page 5 of 6
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