Installation guide

Electrical Connections
llSV. 60Hz.
-- BOX
Ground
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Low Voltage
Terminal Board
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NOTE: 115 VAC/6OHz/single-phase 25-25-13
Operating voltage range*: 127 VAC max, 104 VAC min.
* Permissible limits of voltage at which unit will operate satisfactorily
Control Connections
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24 VAC
HUM_4 P
FUSE
DiagnosticLight
HUM
25-24-98
Furnace Control Fuse
The 24V circuit contains a 5-amp, automotive-type fuse located
on furnace control. (See Figure 12) Any electrical shorts of 24V
wiring during installation, service, or maintenance may cause fuse
to blow. If fuse replacement is required, use only a fuse of identical
size (5 amp.).
Furnace Control
The furnace control is preset at the factory with ON delay of 30 sec-
onds in the heating mode. The blower OFF timing is preset at 140
seconds. If desired, the fan OFF delay can be reset to obtain the
longest delay times while still maintaining comfort levels. See
"Furnace Wiring Diagram".
9. Ductwork and Filter
CARBON MONOXIDE POISONING HAZARD.
nace is NOT permitted. Supply duct connection is permitted to
ONLY the bottom of the furnace.
Failure to properly seal duct could result in death or
personal injury.
Do NOT draw return air from inside a closet or
utility room where furnace is located. Return air duct
MUST be sealed to furnace casing.
FIRE HAZARD.
Duct Design
Design and install the air distribution system to comply with Air
Conditioning Contractors of America manuals or other approved
methods that conform to local codes and good trade practices.
When the furnace is located in an area near or adjacent to the living
area, the system should be carefully designed with returns to mini-
mize noise transmission through the supply and return air grilles.
Any blower moving a high volume of air will produce audible noise
which could be objectionable when the unit is located very close to
a living area. It is often advisable to route the supply air ducts un-
der the floor and return air ducts through the attic.
Failure to install furnace on noncombustible
subbase could result in death, personal injury
and/or property damage.
Place furnace on noncombustible subbase on
downflow applications, unless installing on
Refer to furnace Technical Support Manual (BlowerData) for
airflow information.
Size ductwork to handle airflow for heating and air conditioning
if used.
non-combustible flooring.
Duct Installation Requirements
Duct Connections
This furnace may be installed in only a top return-air application.
Return air duct connection through the side(s) or back of the fur-
441 01 231402
When a furnace is installed so that supply ducts carry air circu-
lated by the furnace to areas outside of the space containing
the furnace, the return air shall also be handled by duct(s)
sealed to the furnace casing and terminating outside the space
containing the furnace.
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