Duct Installation - Modine Manufacturing DBP Installation And Service Manual

duct installation

duct installation
furnace discharge duct connection
1. The furnace discharge is designed to accept straight
ductwork. (See Figure 5.1.) 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 removable access panels on the downstream side
of the ductwork. (See Figure 5.1.) 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 5.1 - furnace discharge duct connection
3. Provide uniform air distribution over the heat exchanger. Use
turning vanes where required to obtain uniform air distribution.
(See Figure 5.2).
figure 5.2 - recommended field installed discharge
duct configurations for Blower Package units
PROVIDE LEAK TIGHT ACCESS PANELS
IN SIDE OF DISCHARGE DUCT FOR
TURNING VANES
HEAT EXCHANGER INSPECTION
3" MINIMUM
3" MAXIMUM
A
AIR
FLOW
12" MINIMUM
B*
*DIMENSION "B" SHOULD NEVER BE
LESS THAN 1/2 OF DIMENSION "A".
PROVIDE LEAK TIGHT ACCESS PANELS
IN SIDE OF DISCHARGE DUCT FOR
HEAT EXCHANGER INSPECTION
TURNING VANES
3" MINIMUM
3" MAXIMUM
A
AIR
FLOW
12" MINIMUM
B* *DIMENSION "B" SHOULD NEVER BE
LESS THAN 1/2 OF DIMENSION "A".
SIDE VIEW
TOP VIEW
5-565.1
Blower section and cooling cabinet discharge duct
connections
The blower section back and bottom and cooling cabinet
section discharge are designed to accept 90° flanged ductwork.
(See Figure 5.3.) Provide an airtight seal between the ductwork
and the unit. 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.
figure 5.3 - Blower section and cooling cabinet
discharge duct connections
1/2"
DUCTWORK
WITH 90°
1/2" FLANGE
BLOWER OR
COOLING COIL
SECTION
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