Amana AMH8 Operations Instructions download pdf (Page 35)

PRODUCT DESIGN

A return air filter is not supplied with the furnace. The in-

staller must supply a means of filtering all of the return air.

Filter(s) shall comply with UL900 or CAN/ULC-S111 Stan-

dards. If the furnace is installed without filters, the warranty

will be voided.

FURNACE INPUT FILTER SIZE

40M / 45M

320 in

60M / 70M

483 in

80M / 90M

640 in

100M / 115M

800 in

120M

738 in

140M

738 in

DISPOSABLE NOMINAL 300 F.M. FACE VELOCITY

MINIMUM FILTER SIZES for DISPOSABLE FILTERS

Cabinet

Width

(In.)

Nominal

Filter

Size (In.)

Approx.

Flow Area

(In.)

Cabinet

Width

(In.)

Nominal

Filter

Size (In.)

Approx.

Flow Area

(In.)

All 16x25x1 400 14" 14X25X1 350

17-1/2 14X25X1 350

21 16x25x1 400

24-1/2 20X25X1 500

SIDE RETURN BOTTOM RETURN

Refer to Minimum Filter Area tables to determine filter area

requirement. NOTE: Filters can also be installed elsewhere

in the duct system such as a central return.

One inch throwaway filters should be sized for a face ve-

locity of 300 feet per minute or less (14x25x1 throwaway =

730 CFM maximum, 16x25x1 throwaway = 830 CFM maxi-

mum, 18x25x1 throwaway = 940 CFM maximum, 20x25x1

throwaway = 1040 CFM maximum) All other filters should

be sized according to their manufacturer's instructions.

To find the miminum filter requirement (in

) for either per-

manent or disposable filters divide the required airflow (CFM)

by the rated velocity of the filter, either 300ft/min for dis-

posable filter or 600ft/min for permanent filter. Multiply the

number by 144 in.

to obtain the minimum filter requirement

(in

EXAMPLE:

Filter Size (in

) =

1400 CFM x 144 in

600 ft./min. (Permanent)

Filter Size (in

) =

1400 CFM x 144 in

300 (Disposable) ft./min.

Filter Size = 672in

Disposable

Filter Size = 336in

Permanent

Upflow furnaces with air delivery of less than 1800 CFM:

Use one side return or one bottom return ductwork con-

nection.

Upflow furnaces with air delivery of 1800 CFM or higher:

Use two side returns or one side return and one bottom

return connection.

Guide dimples locate the side and bottom return cutout lo-

cations. Use a straight edge to scribe lines connecting the

dimples. Cut out the opening on these lines. An undersized

opening will cause reduced airflow. For bottom return con-

nection, remove the bottom of the cabinet before setting

the furnace on the raised platform or return air duct.

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

duct connected to the furnace.

NOTE: Ductwork must never

be attached to the back of the furnace. Supply and return

connections to the furnace may be made with flexible joints

to reduce noise transmission, if desired. If a central return

s used, a connecting duct must be installed between the

unit and the utility room wall so the blower will not interfere

with combustion air or draft. The 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

furnace 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 heating, the temperature of the return

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

UPRIGHT FILTER INSTALLATIONS

Depending on the installation and/or customer preference,

differing filter arrangements can be applied. Filters can be

installed in the central return register and a side panel ex-

ternal filter rack kit (upflow filter kit # EFR01). As an alter-

native a media air filter or electronic air cleaner can be

used as the requested filter. Refer to the following minimum

filter requirement charts for determination of the minimum

filter area to ensure proper unit performance. The following

figures show possible filter locations. NOTE: A ductwork

access door must be used in counterflow applications to

allow filter removal. If the filter rack is used, the side of the

plenum must be at least as tall as dimension "A" shown in

the following illustration. For dimension of "A" refer to the

following chart.

COUNTERFLOW FILTER INSTALLATION

This furnace has provisions for the installation of return air

filters at the counterflow top return. The furnace will

accommodate the following filter sizes depending on cabinet

size:

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 61 62

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Amana AMH8 Operations Instructions Page 35

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