Carrier Condensing gas furnace Operations Instructions download pdf (Page 23)

portion of return-air duct. Bypass humidifier connections should

be made at ductwork or coil casing sides exterior to furnace.

Step 5—Filter Arrangement

FIRE, CARBON MONOXIDE AND POISONING

HAZARD

Failure to follow this warning could result in fire, personal

injury or death.

Never operate unit without a filter or with filter access door

removed.

The air filter arrangement will vary due to application, furnace

orientation, and filter type. The filter may be installed in an

external Filter/Media cabinet (if provided) or the furnace blower

compartment. Factory supplied washable filters are shipped in the

blower compartment.

If a factory-supplied external Filter/Media cabinet is provided,

instructions for its application, assembly, and installation are

packaged with the cabinet. The Filter/Media cabinet can be used

with the factory-supplied washable filter or a factory-specified

high-efficiency disposable filter (see cabinet instructions).

If installing the filter in the furnace blower compartment, deter-

mine location for filter and relocate filter retaining wire, if

necessary. See Table 4 to determine correct filter size for desired

filter location. Table 4 indicates filter size, location, and quantity

shipped with this furnace. See Fig. 2 for location and size of

bottom and side return-air openings.

CUT HAZARD

Failure to follow this caution may result in minor personal

injury.

Use care when cutting support rods in filters to protect against

flying pieces and sharp rod ends. Wear safety glasses, gloves,

and appropiate protective clothing.

UNIT MAY NOT OPERATE

Failure to follow this caution may result in intermittent unit

operation or performance satisfaction.

For airflow requirements above 1800 CFM, see Air Delivery

table in Product Data literature for specific use of single side

inlets. The use of both side inlets, a combination of 1 side and

the bottom, or the bottom only will ensure adequate return air

openings for airflow requirements above 1800 CFM.

NOTE: Side return-air openings can ONLY be used in UPFLOW

configurations. Install filter(s) as shown in Fig. 27.

For bottom return-air applications, filter may need to be cut to fit

some furnace widths. Install filter as shown in Fig. 28.

NOTE: Remove and discard bottom closure panel when bottom

inlet is used.

Step 6—Bottom Closure Panel

These furnaces are shipped with bottom closure panel installed in

bottom return-air opening. This panel MUST be in place when side

return air is used.

Table 4—Filter Information

AIR FILTER LOCATED IN BLOWER COMPARTMENT

Furnace

Casing

Width (In.)

Filter Size (In.)

Filter Type

Framed

Side Return†* Bottom Return*

17-1/2 (1) 16 X 25 X 1 (1) 16 X 25 X 1 Cleanable

21 (1) 16 X 25 X 1 (1) 20 X 25 X 1 Cleanable

24-1/2 (1 or 2) 16 X 25 X 1 (1) 24 X 25 X 1 Cleanable

* Factory-provided with the furnace. Filters may be field modified by cutting

filter material and support rods (3) in filters. Alternate sizes can be ordered

from your distributor or dealer.

† Upflow only. Alternate sizes and additional filters may be ordered from your

dealer.

Fig. 27—Filter Installed for Side Inlet

A93045

FILTER

RETAINER

WASHABLE

FILTER

Fig. 28—Bottom Filter Arrangement

A00290

WASHABLE

FILTER

SUPPORT

FILTER

RETAINER

⁄2-IN. WIDE

CASINGS ONLY:

INSTALL FIELD-SUPPLIED

FILTER FILLER STRIP

UNDER FILTER.

1″

″

3″

21-IN. WIDE

CASINGS ONLY:

SUPPORT RODS (3)

EXTEND 1/4" ON EACH

SIDE OF FILTER AND

REST ON CASING FLANGE

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 59 60

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Carrier Condensing gas furnace Operations Instructions Page 23

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