Table of Contents
Advertisement
Ductwork Sizing
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
Contractors 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. 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. To prevent the
blower from interfering with combustion air or draft when a
central return is used, a connecting duct must be installed
between 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 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 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 inspec-
tion 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.
When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space
containing the furnace, the return air shall also be handled
by a duct sealed to the furnace casing and terminating
outside the space containing the furnace.
Filters
R
T
S
B
EAD
HIS
ECTION
EFORE
A
IR
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.
Use a straight edge to scribe lines, connect the guide
dimples located on the side return cutout locations. Cut
out the opening on these lines.
Circulating Air and Filters
"Air Conditioning
I
T
R
NSTALLING
HE
D
UCTWORK
NOTE: An undersized opening will cause reduced
airflow.
Units with an air delivery of less than 1800 CFM should
either use the bottom return or one-side return.
Units with an air delivery of 1800 CFM or higher must either
use a two-side return combination or a one-side return and
one bottom return combination. These combinations pro-
vide proper airflow through the unit.
To ensure proper unit performance follow the filter sizes
given in the Specifications Sheet.
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, a side panel external filter rack kit, or
inside the side panel. 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 Specifica-
tions Sheet to ensure proper unit performance.
following figures show possible filter locations.
CENTRAL
RETURN
GRILLE
Horizontal Installations
Filters must be installed in either the central return register
or in the return air duct work.
Refer to the Specification Sheet for recommended mini-
ETURN
mum filter sizes.
25
25
Upright Installations
AIR FLOW
SIDE RETURN
EXTERNAL FILTER
RACK KIT
(EITHER SIDE)
F I L T E R
Possible Filter Locations
The
SIDE RETURN
INTERNAL FILTER
RETENTION
(EITHER SIDE)
Advertisement
Table of Contents
Troubleshooting
