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17
C10695
Fig. 17 -- Unit Wiring
Table 6 – Fan Contactor Coil Data
UNIT
524J*
VOLTAGE
(vac)
MAXIMUM
HOLDING VA
25A, 25H, 28A, 30A 24 10
Connecting Ductwork -- Refer to the System Design
Manual for the recommended design and layout of
ductwork. Fig. 18 shows recommended duct connection to
units with 2 fans.
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.
CAUTION
!
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 discharge opening. See Fig. 19. After
flanges are installed, connect them to the supply duct
using a canvas connection to prevent vibration. It is
important that this connection be properly 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 economizer.
Refer to Economizer Installation Instructions.
Return--Air Filters -- Type and size of filters are shown
in Tables 1A – 1D 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 for
instructions on filter element replacement.
524J