Unit Wiring; Fan Contactor Coil Data; Connecting Ductwork; Return-Air Filters - Carrier 40RM007-034 Installation, Start-Up And Service Instructions Manual

Table 6 — Fan Contactor Coil Data
UNIT
40RM, 40RMQ
40RMS
007-034
Connecting Ductwork —
Design Manual for the recommended design and layout of
ductwork. Figure 18 shows recommended duct connection to
units with 2 fans.
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.
DISCHARGE CONNECTIONS — Duct
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.
Fig. 17 — Unit Wiring
MAXIMUM
VOLTAGE
HOLDING
(vac)
VA
24 10
Refer to the Carrier System
flanges
Return-Air Filters —
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.
are
Fig. 18 — Typical Fan Discharge Connections
24
LEGEND
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
NOTE: Use copper conductors only.
Type and size of filters are shown
for Multiple Fan Units