Instruction manual

ManualsBrandsAmana ManualsHeating SystemGCCA

XIII. Circulating Air and Filters

DUCTWORK - AIR FLOW

Duct systems and register sizes must be properly de-

signed for the CFM and external static pressure rating of

the furnace. Ductwork should be designed in accordance

with the recommended methods of “Air Conditioning Con-

tractors of America” Manual D.

A duct system must be installed in accordance with Stan-

dards of the National Board of Fire Underwriters for the

Installation of Air Conditioning, Warm Air Heating and

Ventilating Systems. Pamphlets No. 90A and 90B.

A closed return duct system must be used, with the return

duct connected to the furnace. Supply and return con-

nections to the furnace may be made with flexible joints to

reduce noise transmission. To prevent the blower from

interfering with combustion air or draft when a central

return is used, a connecting duct must be installed be-

tween the unit and the utility room wall. A room, closet, or

alcove must not be used as a return air chamber.

When the furnace is used in connection with a cooling unit,

the furnace should be installed in parallel with or on the

upstream side of the cooling unit to avoid condensation in

the heating element. With a parallel flow arrangement, the

dampers or other means used to control the flow of air must

be adequate to prevent chilled air from entering the fur-

nace and, if manually operated, must be equipped with

means to prevent operation of either unit unless the

damper is in the full heat or cool position.

When the furnace is installed without a cooling coil, it is

recommended that a removable access panel be provided

in the outlet air duct. 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 visual light

inspection or such that a sampling probe can be inserted

into the airstream. The access panel must be made to

prevent air leaks when the furnace is in operation.

When the furnace is heating, the temperature of the return

air entering the furnace must be between 55°F and 100°F.

FILTERS - READ THIS SECTION BEFORE

INSTALLING THE RETURN AIR DUCTWORK

Filters must be used with this furnace. Discuss filter main-

tenance with the building owner. Filters do not ship with

this furnace, but must be provided by the installer. Filters

must comply with UL900 or CAN/ULCS111 standards. If

the furnace is installed without filters, the warranty will be

voided.

Guide dimples locate the side and bottom return cutout

locations. Use a straight edge to scribe lines connecting

the dimples. Cut out the opening on these lines. NOTE:

An undersized opening will cause reduced airflow.

For air delivery of less than 1800 CFM, use a one side or

bottom return.

For air delivery of 1800 CFM or higher, use either a two side

return or a one side return with a bottom return.

To ensure proper unit performance follow the filter sizes

given in the Specifications Sheet.

UPRIGHT INSTALLATIONS

Depending on the installation and/or customer preference,

differing filter arrangements can be applied. Filters can be

installed in the central return register, the bottom of the

blower compartment (upflows), a side panel external filter

rack kit (upflows), inside the side panel (upflows), or the

ductwork above a counterflow furnace. As an alternative

a media air filter or electronic air cleaner can be used as the

requested filter. Review and follow the filter sizes given in

the Specifications Sheet to ensure proper unit perfor-

mance. The following figures show possible filter loca-

tions. NOTE: A ductwork access door must be used in

counterflow applications to allow filter removal.

FILTER

AIR FLOW

EXTERNAL

FILTER

RACK KIT

CENTRAL

RETURN

GRILLE

BOTTOM

RETURN

POSSIBLE UPRIGHT UPFLOW

FILTER LOCATIONS

FILTER

AIR FLOW

FILTER

ACCESS

DOOR

CENTRAL

RETURN

GRILLE

RETURN

DUCT

FILTER

SUPPORT

BRACKET

(PROVIDED)

POSSIBLE UPRIGHT COUNTERFLOW

FILTER LOCATIONS