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Upflow Installations
A ground joint union, drip leg, and manual shutoff valve must
also be supplied by the installer. In some cases, the installer
may also need to supply a transition piece from 1/2" to another
pipe size.
When the gas piping enters through the side of the furnace,
the installer must supply the following fittings (starting from
the gas valve nipple elbow):
•
Straight pipe to reach the exterior of the furnace.
•
A ground joint union, drip leg, and manual shutoff
valve must also be supplied by the installer.
Gas Piping Checks
Before placing unit in operation, leak test the unit and gas
connections.
T
O AVOID THE POSSIBILITY OF EXPLOSION OR FIRE
OR OPEN FLAME TO TEST FOR LEAKS
Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector, or
other approved testing methods.
T
O PREVENT PROPERTY DAMAGE OR PERSONAL INJURY DUE TO FIRE
THE FOLLOWING INSTRUCTIONS MUST BE PERFORMED REGARDING GAS
,
CONNECTIONS
PRESSURE TESTING
INSTALLATION OF GAS PIPING
NOTE: Never exceed specified pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overfiring, resulting in heat exchanger failure.
Disconnect this unit and shutoff valve from the gas supply
piping system before pressure testing the supply piping system
with pressures in excess of 1/2 psig (3.48 kPa).
This unit must be isolated from the gas supply system by
closing its manual shutoff valve before pressure testing of
gas supply piping system with test pressures equal to or less
than 1/2 psig (3.48 kPa).
I
F THE GAS FURNACE IS INSTALLED IN A BASEMENT
,
AREA OR CONFINED SPACE
IT IS STRONGLY RECOMMENDED TO
CONTACT A CERTIFIED CONTRACTOR TO INSTALL A GAS DETECTING
WARNING DEVICE IN CASE OF A GAS LEAK
WARNING
,
NEVER USE A MATCH
.
CAUTION
,
LOCATION OF SHUTOFF VALVE AND
.
WARNING
,
AN EXCAVATED
.
Circulating Air and Filters
Ductwork - Air Flow
N
EVER ALLOW THE PRODUCTS OF COMBUSTION
,
MONOXIDE
TO ENTER THE RETURN DUCT WORK OR CIRCULATION AIR
.
SUPPLY
Duct systems and register sizes must be properly designed
for the CFM and external static pressure rat ing of the
furnace. Ductwork should be designed in accor dance with
the recommended methods of "Air Conditioning Contractors
of America" Manual D.
A duct system must be installed in accordance with Standards
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. For installations requiring
more than 1800 CFM, use a bottom return or two sided return.
Supply and return con nections to the furnace may be made
with flexible joints to reduce noise transmission. To prevent
the blower from inter fering 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. Furnace is shipped
with the top flanges in the flat position. Before installing a coil
or ducts, the flanges must be bent 90°. 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 condensa tion in
the heating element. With a parallel flow arrange ment, 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.
Damper must be in open position when appliance main burner
is operating.
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 inspection 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.
NOTE: In a horizontal installation the air conditioning coil
must be adequately supported by proper brackets and
supports. Inadequate coil support can result in furnace
cabinet distortion and air leakage.
When the furnace is heating, the temperature of the return
air entering the furnace must be between 55°F and 100°F.
18
WARNING
,
INCLUDING CARBON
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