269425-UUM-A-0407
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Unitary Products Group
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 to be sure you install
the right size filter for your furnace. Never operate your furnace without
a suitable air filter.
Removing Filters
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.
NOTES:
1. Air velocity through throwaway type filters may not exceed 300 feet per minute (91.4 m/min). All velocities over this require the use of high velocity filters.
2. Air flows above 1800 CFM require either return from two sides or one side plus bottom.
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.
Motor Lubrication
The motors in these furnaces are permanently lubricated, and do not
require periodic oiling.
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.
TABLE 1:
Recommended Filter Sizes
CFM
(m³/min)
Cabinet
Size
Side
(in)
Side
(cm)
Bottom
(in)
Bottom
(cm)
1200 (33.98)
A
16 x 25
40.6 x 6.35
14 x 25
35.6 x 6.35
1200 (33.98)
B
16 x 25
40.6 x 6.35
16 x 25
40.6 x 6.35
1600 (45.31)
B
16 x 25
40.6 x 6.35
16 x 25
40.6 x 6.35
1600 (45.31)
C
16 x 25
40.6 x 6.35
20 x 25
50.8 x 6.35
2000 (56.63)
C
(2) 16 x 25
(2) 40.6 x 6.35
20 x 25
50.8 x 6.35
2200 (62.30)
C
(2) 16 x 25
(2) 40.6 x 6.35
20 x 25
50.8 x 6.35
2000 (56.63)
D
(2) 16 x 25
(2) 40.6 x 6.35
22 x 25
55.9 x 6.35
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.
