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DUCT CONNECTIONS / UTILITY CONNECTIONS / UNIT INSTALLATION
DUCT CONNECTION TO UNIT
1. The furnace discharge (units with Model Digit 2=B) is
designed to accept straight ductwork (see Figure 6.1.).
The blower section end and bottom openings (all units) and
cooling cabinet section discharge (units with Model Digit 2=C)
are designed to accept 90° flanged ductwork (see Figure 6.2).
Provide an airtight seal between the ductwork and the
furnace. Seams with cracks in the ductwork should be
caulked and/or taped and be of permanent type. All duct
connections MUST be airtight to prevent air leakage.
2. Provide uniform air distribution over the heat exchanger.
Use turning vanes where required to obtain uniform air
distribution. (See Figure 6.3).
3. Provide removable access panels on the downstream side
of the ductwork. (See Figure 6.1.) This opening 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 6.1 - Furnace Discharge Duct Connection
STRAIGHT
DUCTWORK
Figure 6.2 - Blower Section Inlet and Cooling Coil
Section Discharge Duct Connections
1/2"
90°
FLANGED
DUCTWORK
6
Figure 6.3 - Recommended Field Installed Discharge
Duct Configurations for Blower Package Units
Utility Connections
ACCESS
PANEL
Utility and control connections can be made to the unit from the
bottom or through the fixed side panels for floor mounted units.
Holes can be made in fixed side panels to accommodate utility
connections for any model or as specified according to the unit
dimensional drawings. Sealing of holes cut in the unit casing for
utility connections should be done with care to prevent air leaks.
Unit Installation
Refer to the applicable sections to make Venting, Gas Connec-
BLOWER AND/OR
tions, Electrical Connections, and Cooling Coil Connections.
COOLING COIL
Make final unit connections to the electric power supply and
CABINET
remote control circuits. Caulk all utility line clearance holes on
the unit after connections are completed.
5-594.10
DIMENSION "B" SHOULD NEVER
BE LESS THAN 1/2 OF DIMENSION "A"
TURNING
PROVIDE LEAK TIGHT ACCESS
VANES
PANELS IN DISCHARGE DUCT
(3" MAX)
FOR HEAT EXCHANGER INSPECTION.
TURNING
PROVIDE LEAK TIGHT ACCESS
VANES
PANELS IN DISCHARGE DUCT
(3" MAX)
FOR HEAT EXCHANGER INSPECTION.
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