10
The filters should be inspected and cleaned or changed
every two months or as required. In some installations, the
filters can be inspected and cleaned or changed after
disconnecting the electrical power and removing the op-
tional access door in the return air plenum. If the installation
does not have an access door proceed as follows:
1. Disconnect the electrical power.
2. Remove the louvered door from the furnace by turning
the door latches 1/4 turn.
3. Remove the left filter first by reaching to the left side of
the blower, pushing the filter up slightly to remove it
from the filter rack. Then carefully pull the filter down
past the left side of the blower housing. Be careful not
to dislodge any trapped dirt or debris from the filter.
(Figure 14)
4. Remove the right filter by reaching to the left side of the
blower. Lift filter up slightly to remove it from the filter
rack. Move the filter to the left side of the return air
plenum, and down past the left side of the blower
housing. Be careful not to dislodge any trapped dirt or
debris from the filter. (Figure 14)
a. Some installations will have two throwaway filters. If
dirty, these filters must be thrown away and re-
placed with two new similar size throwaway filters.
b. Other installations will have two permanent filters.
Wash, rinse and dry dirty permanent filters. After
cleaning, both sides should be sprayed with a filter
adhesive (available in hardware stores) as instructed
on the adhesive container.
When badly torn or uncleanable, permanent filters
must be replaced with permanent filters of the same
type and size.
5. To reinstall the filters, first MAKE CERTAIN THE
AIRFLOW DIRECTION ARROW POINTS TOWARDS
THE FURNACE. Then insert the filters from the left side
of the blower. Starting with the right filter, push the filter
into the plenum so that the bottom of the filter rests in
the filter rack and the upper edge rests against the side
of the plenum. Repeat with the left filter. (Figure 14)
6. Replace the blower door, then reconnect the electrical
power.
HORIZONTAL FILTERS (GDC)
For horizontally installed furnaces, filters must be installed
external to the furnace casing. A central return with filters
installed in the duct behind the return grille may be used.
Clean or replace filters every two months or sooner as
required (replace with the same size and type filter). Dirty
filters are the most common cause of inadequate heating or
cooling performance.
CONDENSATE COLLECTION AND DISPOSAL
(QUALIFIED SERVICER ONLY)
If the drain tubes or condensate collection standpipe as-
sembly become blocked, the components may be re-
moved, cleaned and reinstalled.
INDUCED DRAFT MOTOR LUBRICATION
The induced draft motor bearings are permanently lubri-
cated. No further lubrication is required.
AIR CIRCULATING BLOWER MOTOR LUBRICATION
The air circulation blower motor bearings are permanently
lubricated. No further lubrication is required.
IV. Inspection of Furnace (Qualified
Servicer Only)
WARNING
To avoid death or personal injury due to
shock or burns, the following procedures
must be followed exactly, in sequence,
before inspecting this furnace.
1. Close gas shut-off valve.
2. Disconnect electrical power to furnace.
3. To allow the furnace to cool, wait 15
minutes before proceeding.
INSPECTION PROCEDURES
•
Vacuum the burner vestibule annually.
•
Burners, mounting brackets and all other parts in the
vestibule area for signs of deterioration.
•
PVC flue pipe for leaks and holes (the PVC flue pipe
must slope upward away from the furnace).
•
PVC flue outlet and air inlet (some models) for restric-
tion (wasp nests, etc.) and general condition.
•
Return air connection to the furnace for soundness,
proper sealing to the furnace casing and terminating
outside the space containing the furnace.
•
Physical support of the furnace for proper seal between
the support and the base, without any sagging, cracks
or gaps, etc.
•
Burner operation. After reconnecting electrical power
and gas to the furnace, set room thermostat to maxi-
mum setting to operate the furnace. Inspect the main
burner flames. Natural gas flames should be stable,
soft and blue. Propane gas flames may appear slightly
yellow. Dust may cause orange tips. Flame must ex-
tend directly outward from the burner without curling,
floating, or lifting off. On the GUD and GCD furnaces
only, the flames can be inspected through the sight
glass on the front cover.
Only a qualified servicer
should ever remove the cover. (Figure 15)
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.
Figure 15
Burner Inspection
