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MAINTAINING YOUR UNIT
All maintenance should be handled by skilled, experienced per-
sonnel. Your dealer can help you establish a standard procedure.
For your safety, keep the gas heating area clear and free of
combustible materials, gasoline, and other flammable liquids
and vapors.
To ensure proper functioning of the unit, flow of combustion and
ventilating air must not be obstructed from reaching the gas heat-
ing area. Clearance of at least 4 ft on all sides is required.
ROUTINE MAINTENANCE AND CARE
FOR THE EQUIPMENT OWNER
Before proceeding with those things you might want to main-
tain yourself, please carefully consider the following:
WARNING
1.
TURN OFF GAS SUPPLY AND THEN ELECTRI-
CAL POWER TO YOUR UNIT BEFORE SERVIC-
ING OR PERFORMING MAINTENANCE.
2.
Do not turn off electrical power to this unit without
first turning off the gas supply.
3.
When removing access panels or performing mainte-
nance functions inside your unit, be aware of sharp
sheet metal parts and screws. Although special care has
been taken to reduce sharp edges inside the unit, be
extremely careful when handling parts or reaching into
the unit.
Failure to follow these procedures can result in serious fire
or personal injury.
48N BASE UNIT
NOMINAL CAPACITY (tons)
MIXED AIR FILTERS
MERV 7 Pleated Filters
Quantity
Size (in.)
MERV 8 Pleated Filters
Quantity
Size (in.)
MERV 14 Pleated Filters
Quantity
Size (in.)
MERV 14 Cartridge Filters, 2 or 4-in. in Pre-Filters
Quantity
Size (in.)
MERV 14 Bag, 2 or 4-in. in Pre-Filters
Quantity
Size (in.)
MERV 15 Bag, 2 or 4-in. in Pre-Filters
Quantity
Size (in.)
FINAL FILTERS
MERV 14 Cartridge Filters, 2 or 4-in. in Pre-Filters
Quantity
Size (in.)
MERV 15 Bag, 2 or 4-in. in Pre-Filters
Quantity
Size (in.)
MERV 17 HEPA, 2 or 4-in. in Pre-Filters
Quantity
Size (in.)
NOTES:
1. See base unit Installation Instructions if field-supplied or optional
factory-supplied filters are used. When replacing filters, always use
the same type and size originally supplied.
Air Filters
Air filters should be checked at least every 3 or 4 weeks and
changed or cleaned whenever they become dirty. Table 1
indicates the correct filter size for your unit. Open the hinged
filter access door to replace or inspect the filters. All units have
filter tracks into which the filters slide. Remove the filters by
pulling outward from the track. See Fig. 4.
If you have difficulty in locating your air filter in the return-air
duct system, or if you have questions concerning proper filter
maintenance, contact your dealer for instructions.
When replacing your unit filters, always use the same size and
type of filter that was originally supplied by the installer.
Units with outdoor air capability have a cleanable filter for the
outdoor air. This filter should be checked annually and cleaned
as necessary. Remove by removing screws in outdoor-air filter
retainer and sliding filters out of the unit.
Never operate your unit without filters in place. Failure to
heed this warning may result in damage to the blower mo-
tor and/or compressor. An accumulation of dust and lint on
internal parts of your unit can cause loss of efficiency and,
in some cases, fire.
Heat Exchanger
To ensure dependable and efficient heating operation, the heat
exchanger should be checked by a qualified maintenance per-
son before each heating season, and cleaned when necessary.
This checkout should not be attempted by anyone not having
the required expertise and equipment to do the job properly.
Checking and/or cleaning the heat exchanger involves remov-
ing the gas controls assembly and the flue collector box cover
and, when completed, reinstalling the gas controls assembly
for proper operation. Also, the flue collector box cover must be
replaced correctly so that a proper seal is maintained. Contact
your dealer for the required periodic maintenance.
Table 1 — Air Filter Data
N
P
75
90
2 inch, MERV 7
28
20x24x2
4 inch, MERV 8
28
20x24x4
4 inch, MERV 14
28
20x24x4
12 inch, MERV 14 Cartridge Filters
20
(15) 20x24x12, (5) 24x24x12
12 inch, MERV 14 Bag Filters
20
(15) 20x24x12, (5) 24x24x12
19 inch, MERV 15 Bag Filters
20
(15) 20x24x19, (5) 24x24x19
12 inch, MERV 14 Cartridge Filters
19
(14) 20x24x12, (5) 24x24x12
19 inch, MERV 15 Bag Filters
19
(14) 20x24x19, (5) 24x24x19
12 inch, MERV 17 HEPA Filters, 99.99%
19
(14) 24x12x12, (5) 24x24x12
2. When using pre-filters with bag filters, the pre-filters will be the
same number and dimensions as the bag filters.
6
WARNING
Q
R
105
120
2 inch, MERV 7
20x25x2
4 inch, MERV 8
20x25x4
4 inch, MERV 14
20x25x4
12 inch, MERV 14 Cartridge Filters
24x24x12
12 inch, MERV 14 Bag Filters
24x24x12
19 inch, MERV 15 Bag Filters
24x24x19
12 inch, MERV 14 Cartridge Filters
24x24x12
19 inch, MERV 15 Bag Filters
24x24x19
12 inch, MERV 17 HEPA Filters, 99.99%
24x24x12
S
T
130
150
28
28
28
20
20
20
19
19
19
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