Sears N9MP2050B12B1 Filter Installation using Optional Filter Rack, Addition Of Air Conditioning

Mounted Filter Rack

25-20-90

Filter Installation using Optional Filter Rack

When installing or removing a bottom mounted filter, slide the two side filter clips to the back of the furnace BEFORE installing or re- moving. This will allow the filter to clear the front raised edge of the furnace. Insert filter into side clips first and push filter back until it is fully engaged into back clip. When filter is in place, slide clips back into place midway on filter as shown in Figure 36.

Bottom Mounted Filter Rack

25-24-18

Slide filter clips towards back before removing

Refer to Figure 37 and for guidelines to install filters. Furnaces

which require larger filter media and have limited clearances on one side of furnace, require a standoff filter rack, see Figure 37, available from your distributor.

Standoff Filter Rack

UsingOptional

Standoff Filter

Rack

25-21-45a

CAUTION

If filters are only suitable for heating application, advise

homeowner that filter size may need to be increased if air

conditioning is added.

Addition Of Air Conditioning

When a refrigeration coil is used in conjunction with this unit, it must be installed on the discharge side of the unit to avoid con- densation on the heat exchanger. The coil installation instructions must be consulted for proper coil location and installation proce-

dures. With a parallel flow arrangement, dampers must be installed to prevent chilled air from entering the furnace. If ma nual- ly operated dampers are used, they must be equipped with a means to prevent operation of either unit unless the damper is in full heat or full cool position.

A 3" clearance is required on the right side ofthe furnace in order to run the condensate drain line. Copper, iron or plastic tubing may be

used for the condensate drain line.

Downflow Furnace Installation

Non- Combustible Floor Installation

Fabricate a plenum to the dimensions given in Table 11, for the fur-

nace outlet. Plenum should be flanged, approximately 3/4" for sup- port.

Note: The three(3) screws in the top panel of the furnace next to

the duct flange MUST be removed to provide serviceability of the primary heat exchangers in the downflow installation

1.Position plenum through the floor and set the furnace over the opening in the floor. If necessary, grout around the base to seal air leaks between the base and the floor.

Combustible Floor Installation

FIRE HAZARD

Failure to install unit on noncombustible subbase

could result in death, personal injury and/or property damage.

Place furnace on noncombustiblesubbase on

downflow applications, unless installing on non-

combustible floorinq.

;ubbase for Combustible Floor

NOTE: The three(3) screws in the top panel of the furnace next to

the duct flange MUST be removed to provide serviceability of the primary heat exchangers in the downflow installation

Note: When using the subbase for combustible floors, the dis- charge air duct flanges on the furnace MUST be broken down to provide proper fit up to the subbase. Use duct pliers to bend the duct flanges flat onto the furnace casing. DO NOT bend the duct

flanges inward (toward the heat exchangers) as air flow restric- tions may occur.

The Subbase for Combustible Floors MUST be used when a

downflow furnace is set on a combustible floor, even when the fur- nace is installed on a coil box.

1.Cut the opening in the floor according to Table 11. The hole in the floor must be cut to the dimensions listed in Table 11

since the base is equipped with locating tabs that center the base over the opening.

The opening in the base is 11/4 ', shorter and 11/8', narrower than

the recommended size of the opening in the floor. This is done to maintain clearance between the floor and the plenum.

2.Fabricate the plenum to the dimensions given in Table 11.

Note that the dimensions given are outside dimensions.

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