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UNIT SUSPENSION / INSTALLATION
UNIT SUSPENSION
Be sure the means of suspension is adequate to support the
weight of the unit (see Dimensional Data for unit weights). For
proper operation, the unit must be installed in a level horizontal
position. Combustible material and service clearances as
specified in Figure 3.1 and Tables 3.2 and 3.3 must be strictly
maintained.
1. Four 1/2" - 13NC tapped holes in top of furnace are provided
to accept ceiling hangers. To assure that flames are directed
into the center of the heat exchanger tubes, the furnace must
be supported in a vertical position. Use a spirit level to ensure
that unit is suspended correctly.
2. NOTE: A pipe hanger adapter kit, shown in Figure 4.1, is
available as an accessory. One kit consists of two drilled
3/4" IPS pipe caps and two 1/2 - 13 x 1-3/4" capscrews to
facilitate threaded pipe suspension. Two kits are required for
mounting all duct furnace models.
Figure 4.1 - Suspension Methods
(Threaded Rod)
INSTALLATION
Direction of Airflow
Select proper direction of airflow. The air baffle must face the
air inlet direction as shown in Figure 4.2. If it is necessary to
reverse the airflow direction, remove the four screws securing
the air distribution baffle, reverse the air distribution baffle to the
air inlet side and replace the screws. See Airflow Reversal Note.
Figure 4.2 - Air Distribution Baffle Location
Baffle location shown on entering air side of duct furnace.
AIR
DISTRIBUTION
BAFFLE
Airflow Reversal Note: If factory installed discharge air options
(thermostat, freeze protection, etc.) were provided, these
options would have to be relocated to the discharge air side of
the duct furnace. The orientation of the unit will be 180 degrees,
rotated right to left impacting control access and vent connector
locations.
4
C
(Pipe Adapter Kit)
Air Distribution Baffle Removal
The duct furnaces are supplied with a factory installed air baffle.
For applications where an air temperature rise less than 60°F
is desired, it is recommended to remove this baffle to reduce
system pressure drop. Refer to Figures 15.2 and 15.3.
Duct Installation
1. The furnace is designed to accept straight ductwork. See
Figure 4.3. Provide an airtight seal between the ductwork
and the furnace. Seams with cracks in ductwork should be
caulked and/or taped and be of permanent type. All duct
connections MUST be airtight to prevent air leakage.
2. Provide removable access panels on both the upstream and
downstream sides of the ductwork; see Figure 4.3. These
openings should be large enough to view smoke or reflect
light inside the casing to indicate leaks in the heat exchanger
and to check for hot spots on heat exchangers due to poor air
distribution or lack of sufficient air (CFM)
Figure 4.3 - Duct Connections
Airflow Distribution
IMPORTANT
To prevent premature heat exchanger failure, observe heat
exchanger tubes by looking at the heat exchanger through
field installed access openings in connecting ductwork. If
the bottom of the tubes become red while blower and duct
furnace are in operation, additional baffles must be inserted
between blower and duct furnace to assure uniform air flow
across the heat exchanger.
1. Provide uniform air distribution over the heat exchanger.
Use turning vanes where required (see Figure 5.1) to obtain
uniform air distribution. Avoid installing as in "G", "H" & "J" of
Figure 5.1.
2. A bottom, horizontal discharge type blower should be
installed at least 12" from the furnace (See "A", Figure 5.1).
3. A top, horizontal discharge type blower should be installed at
least 24" from the furnace (See "B", Figure 5.1). Provide air
baffle at top of duct to deflect air down to the bottom of heat
exchanger.
5-564.4
(MODEL DIGIT 3=P SHOWN)
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