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Connecting Ductwork
Refer to the System Design Manual for the recommended
design and layout of ductwork. Figure 17 shows recommended
duct connection to units with 2 fans.
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution could cause equipment damage.
Do not operate unit without ductwork or discharge plenum
unless fan speed has been adjusted for external static pressure
of zero in. wg. Failure to do so may result in motor overload.
DISCHARGE CONNECTIONS
Duct flanges are factory-supplied; they are shipped inside the
unit attached to the hairpin end of the coil tube sheet for field
installation. Using the existing screws, install the duct flanges
on the unit's fan deck. Each fan discharge requires 2 flanges;
each flange must be bent in the middle to conform to the
Fig. 16 — Unit Wiring
discharge opening. (See Fig. 18.) After flanges are installed,
connect them to the supply duct using a canvas connection to
prevent vibration. It is important that this connection be prop-
erly fabricated to prevent high air friction losses and air noise.
RETURN CONNECTIONS
When using return-air ductwork, route return-air duct to the
unit's return air inlet near the filter rack, using a canvas
connection to prevent transmission of unit vibration. If the duct
blocks off the unit's access panel, provide a slip joint in the
ductwork to permit removal for servicing.
OUTDOOR-AIR INLET CONNECTIONS
Connect outdoor-air inlet to field-installed accessory econo-
mizer. Refer to Economizer Installation Instructions.
Return-Air Filters
Type and size of filters are shown in Tables 1-6 and are
factory-supplied and factory-installed. In all units with 2 fans,
a filter replacement tool (hook) is shipped inside the unit for
field use when replacing filters. See the Service section on
page 24 for instructions on filter element replacement.
22
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