Carrier 59MN7A Instruction Manual download pdf (Page 20)

Bypass humidifier connections should be made at ductwork or coil

casing sides exterior to furnace. (See Fig. 24.)

Bottom Return Air Inlet

These furnaces are shipped with bottom closure panel installed in

bottom return--air opening. Remove and discard this panel when

bottom return air is used in downflow applications. To remove

bottom closure panel, perform the following:

1. Tilt or raise furnace and remove 4 screws holding bottom

plate. (See Fig. 21.)

2. Remove bottom plate.

3. Remove bottom closure panel.

4. Reinstall bottom plate and screws.

Horizontal Installation

NOTE: The furnace must be pitched forward as shown in Fig. 22

for proper condensate drainage.

FIRE, EXPLOSION, AND CARBON MONOXIDE

POISONING HAZARD

Failure to follow this warning could result in personal

injury, death, or property damage.

Do not install the furnace on its back or hang furnace with

control compartment facing downward. Safety control

operation will be adversely affected. Never connect

return--air ducts to the back of the furnace.

WARNING

MINOR PROPERTY HAZARD

Failure to follow this caution may result in minor property

damage.

Local codes may require a drain pan under entire furnace and

condensate trap when a condensing furnace is used in an attic

application or over a finished ceiling.

CAUTION

The furnace can be installed horizontally in an attic or crawlspace

on either the left--hand (LH) or right--hand (RH) side. The furnace

can be hung from floor joists, rafters or trusses or installed on a

non--combustible platform, blocks, bricks or pad.

Platform Furnace Support

Construct working platform at location where all required furnace

clearances are met. (See Table 2 and Fig. 26.) For furnaces with

1--in. (25 mm) clearance requirement on side, set furnace on

non--combustible blocks, bricks or angle iron. For crawlspace

installations, if the furnace is not suspended from the floor joists,

the ground underneath furnace must be level and the furnace set on

blocks or bricks.

Suspended Furnace Support

The furnace must be supported under the entire length of the

furnace with threaded rod and angle iron. (See Fig. 27.) Secure

angle iron to bottom of furnace as shown.

Roll--Out Protection

Provide a minimum 12--in. x 22--in. (305 x 559 mm) piece of sheet

metal for flame roll--out protection in front of burner area for

furnaces closer than 12--in. (305 mm) above the combustible deck

or suspended furnaces closer than 12--in. (305 mm) to joists. The

sheet metal MUST extend underneath the furnace casing by 1--in.

(25 mm) with the door removed.

The bottom closure panel on furnaces of widths 17--1/2--in. (445

mm) and larger may be used for flame roll--out protection when

bottom of furnace is used for return air connection. See Fig. 26 for

proper orientation of roll--out shield.

Supply Air Connections

For a furnace not equipped with a cooling coil, the outlet duct shall

be provided with a removable access panel. This opening shall be

accessible when the furnace is installed and shall be of such a size

that the heat exchanger can be viewed for possible openings using

light assistance or a probe can be inserted for sampling the air

stream. The cover attachment shall prevent leaks.

Connect supply--air duct to flanges on furnace supply--air outlet.

Bend flange upward to 90_ with wide duct pliers. (See Fig. 19.)

The supply--air duct must be connected to ONLY the furnace

supply--outlet--air duct flanges or air conditioning coil casing

(when used). DO NOT cut main furnace casing side to attach

supply air duct, humidifier, or other accessories. All accessories

MUST be connected to duct external to furnace main casing.

Return Air Connections

The return--air duct must be connected to bottom of the furnace.

The side of casing that faces downward may also be used for return

air connection. A combination of the bottom and downward

facing side may also be used. Bypass humidifier may be attached

into unused return air side of the furnace casing. (See Fig. 25.)

Bottom Return Air Inlet

These furnaces are shipped with bottom closure panel installed in

bottom return--air opening. Remove this panel when bottom return

air is used. This panel may be used as a roll--out shield or discard.

To remove bottom closure panel, perform the following:

1. Tilt or raise furnace and remove 4 screws holding bottom

plate. (See Fig. 21.)

2. Remove bottom plate.

3. Remove bottom closure panel.

4. Reinstall bottom plate and screws.

Side Return Air Inlet

These furnaces are shipped with bottom closure panel installed in

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

side return air inlet(s) are used without a bottom return air inlet.

Not all horizontal furnaces are approved for side return air

connections (See Fig. 25.)

Filter Arrangement

FIRE, CARBON MONOXIDE AND POISONING

HAZARD

Failure to follow this warning could result in fire, personal

injury or death.

Never operate a furnace without a filter or filtration device

installed. Never operate a furnace with filter or filtration

device access doors removed.

WARNING

There are no provisions for an internal filter rack in these furnaces.

An external filter is required.

The furnace is shipped with a factory-supplied Media Filter

Cabinet. The Media Filter Cabinet uses either a standard 1-inch (25

mm) filter or 4-inch (102 mm) wide Media Filter which can be

purchased separately. A field supplied accessory air cleaner may

also be used in place of the media cabinet.

The Media Cabinet is sized for bottom return applications for use

in upflow, downflow and horizontal applications. A 16--inch (406

mm) Media Cabinet is shipped with the 14--3/16-in. (360 mm)

furnace and includes block-off plates

For upflow side return applications, the Media Cabinet (or field

supplied accessory air cleaner) can be installed on the side of the

furnace or side and bottom when a bottom plenum is used. (See

Fig. 17 and 23.)

59MN7A

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Carrier 59MN7A Instruction Manual Page 20

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