Intertek ACVC96 Service Instructions Manual page 38

INSTALLATION CONSIDERATIONS
SIDE RETURN
Cabinet Nominal Approx.
Width Filter Flow Area
(In.) Size (In.) (In.)
All 16x25x1 400
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.
Filter Sizing Chart
Model
*MVC960403BN**
*MVC960603BN**
*MVC960803BN**
*MVC960804CN**
*MVC961005CN**
*MVC961205DN**
*CVC960403BN**
*CVC960603BN**
*CVC960804CN**
*CVC961005CN**
*CVC961205DN**
One inch throwaway filters should be sized for a face veloc-
ity of 300 feet per minute or less (14x25x1 throwaway = 730
CFM maximum, 16x25x1 throwaway = 830 CFM maximum,
18x25x1 throwaway = 940 CFM maximum, 20x25x1 throw-
away = 1040 CFM maximum) All other filters should be sized
according to their manufacturer's instructions.
To find the miminum filter requirement (in
nent or disposable filters divide the required airflow (CFM)
by the rated velocity of the filter, either 300ft/min for dispos-
able filter or 600ft/min for permanent filter. Multiply the num-
2
ber by 144 in. to obtain the minimum filter requirement (in
EXAMPLE:
2
Filter Size (in ) =
2
Filter Size (in ) =
Filter Size
Filter Size
38
BOTTOM RETURN
Cabinet Nominal Approx.
Width Filter Flow Area
(In.) Size (In.) (In.)
14" 14X25X1 350
17-1/2 14X25X1 350
21 16x25x1 400
24-1/2 20X25X1 500
Minimum Filter Size
20 X 24
20 X 25
18 X 36
24 x 30
24 X 36
2 (20 X 25)
20 X 24
20 X 25
18 X 36
24 x 30
2 (20 X 25)
2
) for either perma-
2
1400 CFM x 144 in
600 ft./min. (Permanent)
2
1400 CFM x 144 in
300 (Disposable) ft./min.
2
= 672in Disposable
2
= 336in Permanent
Upflow furnaces with air delivery of less than 1800 CFM:
Use one side return or one bottom return ductwork connec-
tion.
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 is
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 up-
stream side of the cooling unit to avoid condensation in the
heating element. With a parallel flow arrangement, the damp-
ers 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 pre-
vent 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 exter-
nal filter rack kit (upflow filter kit # EFR01). As an alternative
a media air filter or electronic air cleaner can be used as the
requested filter. Refer to the following minimum filter require-
ment charts for determination of the minimum filter area to
ensure proper unit performance. The following figures show
2
).
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 illustra-
tion. For dimension of "A" refer to the following chart.