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Table 6 — Fan Contactor Coil Data
Connecting Ductwork — Refer to the Carrier System
Design Manual for the recommended design and layout of
ductwork. Figure 18 shows recommended duct connection to
units with 2 fans.
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. Us-
ing 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 im-
portant that this connection be properly fabricated to prevent
high air friction losses and air noise.
RETURN CONNECTION — When using return-air duct-
work, 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 CONNECTION — 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-1F 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.
UNIT
40RM, 40RMQ
40RMS
VOLTAGE
(vac)
MAXIMUM
HOLDING
VA
007-034 24 10
Do not operate unit without ductwork or discharge plenum
unless fan speed has been adjusted for external static pres-
sure of zero in. wg. Failure to do so may result in motor
overload.
Fig. 17 — Unit Wiring
LEGEND
NOTE: Use copper conductors only.
EQUIP — Equipment
GND — Ground
HC — Heating Contactor
HTR — Electric Heater
IFC — Indoor-Fan Contactor
IFM — Indoor-Fan Motor
TB — Terminal Block
T’STAT — Thermostat
Factory Wiring
Field Control Wiring
Fig. 18 — Typical Fan Discharge Connections
for Multiple Fan Units