268893-UUM-A-0407
4
Unitary Products Group
NOTE:
The spring-loaded safety cut-off switch, mounted under the
blower deck will automatically cut off the electrical power supply
to the furnace when the blower panel is removed. As a safety
precaution, all electrical power and the gas supply to the furnace
should be turned off before servicing.
FURNACE USER MAINTENANCE
Every time the filters are changed the following items should be visually
inspected:
•
Check combustion air and vent pipe for blockage or leakage.
•
Check all components to be sure they are in good condition and
that there are no obvious signs of deterioration.
•
Check the drain lines to make sure there are no cracks or leaks.
•
Check for dirt or lint on any surfaces or on components. Do not try
to clean any of the surfaces or components. Cleaning of the fur-
nace and its components must be done by a qualified service pro-
fessional.
If during the inspection of your furnace, you find any of the following
conditions:
•
Excessive amounts of dust and lint on components.
•
Damaged or deteriorated components or surfaces.
•
Leaks or blockage in the vent pipe passages.
•
Water on any surface inside or outside of the furnace.
Do not operate the furnace, call a certified dealer / servicing contractor
to check and / or clean your furnace, or for more information if you have
questions about the operation of your furnace.
If all components appear to be in good operating condition, replace the
front panels. Turn ON the gas and electrical power supplies to the fur-
nace, and set thermostat to the desired temperature.
Air Filters
Dirty filters greatly restrict the flow of air and may cause damage to the
moving parts of the furnace. If the filters become clogged the heat
exchangers and blower motor could overheat resulting in a potentially
dangerous situation. The filters should be checked every 3 months. On
new construction, check the filters every week for the first four weeks
and every three weeks after that, especially if the indoor fan is running
continuously. When replacing the filter(s) you must use filters that are
the same size as those recommended in Table 1. Never operate your
furnace without a suitable air filter.
Removing Filters
Internally Mounted Air Filters
Some upflow furnaces may have their filters located on the side or bot-
tom of the furnace in a filter wire retainer located inside the blower com-
partment. To check filters located in the blower compartment:
1.
Remove the upper furnace door by lifting up. Pull out bottom of
door and lower from furnace.
2.
Remove the blower compartment panel by lifting up.
3.
The filters will be located on the bottom or on one of the sides. To
remove bottom-mounted or side mounted filter (s) on all furnaces,
push the looped end of the filter retainer rod in, and then move the
retainer rod away from the filter.
4.
Reverse the procedure to reinstall filters.
Externally Mounted Air Filters
The air filter should be located in a rack attached to the casing of the
furnace or placed in the return air duct. You can gain access to the filter
by pulling on the door or unscrewing the retaining screw, then slide the
filter(s) out of its channel. Replace throw away filter(s) with the same
size new filter(s). Throw away filter(s) may be replaced with cleanable
filter(s) at this time. Cleanable filter(s) may be cleaned as described in
the manufacturer instructions or as described below and then re-
installed.
To replace the filter after cleaning you must do the following:
1.
Slide filter into place.
2.
Snap the door on or place the door in position and tighten the
retaining screws, if provided.
3.
Make sure the door is secure to the end of the filter rack.
How to Clean your Filter
High-velocity filters may be cleaned with a vacuum cleaner or washed
with a garden hose. Be sure to shake off excess water and allow filter to
completely dry before re-installing the filter.
FIGURE 7:
Horizontal Gas Piping
Before proceeding, be sure the area is well ventilated. Turn
the thermostat OFF. If the blower is running, wait until it
stops automatically. Turn OFF the gas and electrical power
supplies to the furnace. Check all metal parts and surfaces
to be sure they have cooled to room temperature before
you begin.
MANUAL
SHUT-OFF
VALVE
GAS
PIPE
GAS
PIPE
DRIP
LEG
MANUAL
SHUT-OFF VALVE
GAS VALVE
GAS BURNERS
DRIP
LEG
FIGURE 8:
Internal Filter Retainer
TABLE 1:
Filter Sizes
Cabinet Size
Side (in)
Side (cm)
Bottom (in)
Bottom (cm)
A
16 x 25
40.6 x 63.5
14 x 25
35.6 x 63.5
A
16 x 25
40.6 x 63.5
14 x 25
35.6 x 63.5
A
16 x 25
40.6 x 63.5
14 x 25
35.6 x 63.5
B
16 x 25
40.6 x 63.5
16 x 25
40.6 x 63.5
C
(2) 16 x 25 (2) 40.6 x 63.5
20 x 25
50.8 x 63.5
B
16 x 25
40.6 x 63.5
16 x 25
40.6 x 63.5
B
16 x 25
40.6 x 63.5
16 x 25
40.6 x 63.5
C
(2) 16 x 25 (2) 40.6 x 63.5
20 x 25
50.8 x 63.5
C
16 x 25
40.6 x 63.5
20 x 25
50.8 x 63.5
C
(2) 16 x 25 (2) 40.6 x 63.5
20 x 25
50.8 x 63.5
D
(2) 16 x 25 (2) 40.6 x 63.5
22 x 25
55.9 x 63.5
POSITION WIRE RETAINER
PROVIDED UNDER FLANGE
CLIPS
RIGHT SIDE
INSTALLATION
SHOWN
FURNACE
FRONT
