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035-19643-001 Rev. B (0204)
FURNACE USER MAINTENANCE
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.
Air Filters
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), refer to Table 1 to be sure you install the
right size filter for your furnace. 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.
Never operate your furnace without a suitable air filter.
Removing Filters
Internally Mounted Air Filters
Most upflow furnaces have their filters located on the side or bottom of
the furnace in a filter wire retainer located inside the blower compart-
ment. 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 the 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
away from the filter.
4.
Reverse the procedure to reinstall filters.
TABLE 1: Filter Sizes
Input BTU/H
Output BTU/H
High / Low (kW)
High / Low (kW)
80/52 (23.4/15.2)
75/48 (22/14.1)
100/65 (29.2/19.1)
95/60 (27.9/17.6)
120/78 (35.1/22.9)
112/72 (32.8/21.1)
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.
Blower Care
Even with good filters properly in place, blower wheels and motors will
become dust laden after long months of operation. The entire blower
assembly should be inspected annually. If the motor and wheel are
heavily coated with dust, they can be brushed and cleaned with a vac-
uum cleaner. If the blower cannot be properly cleaned without removing
it from the furnace, then this service must be performed by a qualified
service agency.
4
Cabinet
3
CFM (m
/min)
Size
1200 (34)
B
2000 (56.7)
C
2000 (56.7)
D
FILTER RACK
(FACTORY SUPPLIED)
A
A
NOTE: FILTER ACCESS THRU
DUCTWORK MUST BE PROVIDED
FOR REMOVAL AND CLEANING
DUCTWORK
CROSS SECTION A-A (WITH PLENUM AND FILTERS)
FIGURE 6: Upflow Internal Filter Retainer
Externally Mounted Air Filters
Some installations may have the air filter in a rack attached to the cas-
ing 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.
Filter Sizes
Horizontal (in) Horizontal (cm)
16 x 25
41 x 64
20 x 25
51 x 64
20 x 25
51 x 64
Make sure you DO NOT move the clip on weight on the
indoor fan wheel when cleaning the wheel. This weight is
used to balance the wheel. Moving the weight will cause
the fan wheel to vibrate.
RACK AND FILTERS SECURED
INSIDE BLOWER SECTION
FOR SHIPMENT
CASING SIZE
DIMENSION FH
16-1/4
12-3/4
22-1/4
11
26-1/4
8-1/4
BRANCH
DUCTS
FILTERS
FILTER
RACK
FH
Downflow (in)
Downflow (cm)
14 x 20
36 x 51
14 x 20
36 x 51
14 x 20
36 x 51
Unitary Products Group
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