Carrier UPFLOW 58BTA - Manual (Page 4)

opening are also illustrated in Figure 7. If the bottom
return is not used, a field-supplied galvanized steel filler
plate should be used to block off the opening.
The following recommendations should be followed when
installing the ductwork:
1. Install locking type dampers in ail branches of the
individual ducts to balance out the system.
Dampers should be adjusted to impose the
proper static at the outlet of the furnace.
2. A flexible duct connector of noncombustible
material should be installed at the unit on both
the supply and return air system. In applications
where extremely quiet operation is necessary, the
first 10 feet (if possible) of supply and return
ducts should be internally lined with acoustical
material.
3. In cases where the return air grille is located
close to the fan inlet, there should be at least one
90° air turn between fan inlet and grille. Further
reduction in sound level can be accomplished by
installing acoustical air turning vanes or lining
duct as described in item 2 above.
4. When a single air grille is used, the duct between
grille and furnace must be the same size as
return opening in furnace.
WARNING
The coil MUST be installed on the air discharge side
of the furnace. Under no circumstances should the air
flow be such that cooled, conditioned air can pass
over the furnace heat exchanger. This will cause
condensation in the heat exchanger and possible
failure of the heat exchanger which could lead to a fire
hazard and/or a hazardous condition which may lead
to bodily harm. Heat exchanger failure due to
improper installation may not be covered by warranty.
2. In parallel flow installation, dampers must be
provided to direct air over the furnace heat
exchanger when heat is desired and over the
cooling coil when cooling is desired.
IMPORTANT: The dampers should be adequate to
prevent cooled air from entering the
furnace, and if manually operated,
must be equipped with the means to
prevent operation of either the
cooling unit or furnace unless the
damper is in the full cool or heat
position.
CAUTION
Return air grilles and warm air registers must not be
obstructed.
Venting Instructions:
Venting of the furnace should be to the outside and in
accordance with local codes or requirements of the local
utility.
WARNING
When supply ducts carry air circulated by the furnace
to areas outside the spaces 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. Incorrect ductwork termination
and sealing will create a hazardous condition which
could lead to bodily harm.
OIL FIRED APPLIANCES SHALL BE CONNECTED TO
FLUES HAVING SUFFICIENT DRAFT AT ALL TIMES
TO ENSURE SAFE AND PROPER OPERATION OF
APPLIANCE.
For additional venting information refer to ANSI/NFPA 211
Chimney. Fireplaces. Vents and Solid Fuel Burning
Appliances and/or CSA B139 Installation Code.
This furnace is certified for use with Type "L" vent
(maximum flue gas temperature 575°F).
When installing the furnace with cooling equipment for
year round operation, the following recommendations
must be followed for series or parallel air flow:
1. In series air flow applications, the coil is mounted
after the furnace in an enclosure in the supply air
stream. The furnace blower is used for both
heating and cooling air flow.
ISSUE 9413
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