Bryant Air Handling Units 524J - Manual (Page 16)

16
Power Supply and Wiring — Check the unit data
plate to ensure that available power supply matches electrical
characteristics of the unit. Provide a disconnect switch with an
integrated lock-out feature of size required to provide adequate
fan motor starting current. See Tables 4-6 for unit electrical
data.
Fig. 13 — Disconnect Switch and Unit
Install disconnect switch and power wiring in accordance with
all applicable local codes. See Fig. 14-16 and the unit label
diagram. For units with motor sizes less than 5 Hp (3.7 kW),
connect power wiring to unit with no. 10 ring terminal. For
units with motor sizes of 5 Hp (3.7 kW) or more, connect
power wiring with 1 /
4
-in. ring terminal.
Fig. 14 — Wiring and Service Access
(Side Panel Removed)
The 524J size 07-16 units that have motors wired for 460-v,
3-ph, 60 Hz operation can be field-converted to 208/230-v,
3-ph, 60 Hz operation. Rewire the motor according to the
diagram plate on the motor. After reconfiguring the motor,
mark the motor specifying 208-v or 230-v operation replacing
the 460-v sticker information on the units’ corner post.
Fan motors are factory-installed on all units. Indoor-fan
contactors are located in the fan contactor box behind the side
access panel (see Fig. 14 and 15). Wire the thermostat to the
24-v control circuit terminal block located in the side of the fan
contactor control box, according to Fig. 16 or the unit label
diagram. If the air handler is part of a split system, complete the
wiring from the condensing unit to the thermostat shown in
Fig. 16.
Fig. 15 — Fan Contactor Box and Terminal Block
(Cover Removed) (Typical)
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not use gas piping as an electrical ground. Unit cabinet
must have an uninterrupted, unbroken electrical ground to
minimize the possibility of personal injury if an electrical
fault should occur. This ground may consist of electrical
wire connected to unit ground lug in control compartment,
or conduit approved for electrical ground when installed in
accordance with NEC (National Electrical Code); ANSI/
NFPA 70, latest edition (in Canada, Canadian Electrical
Code CSA [Canadian Standards Association] C22.1), and
local electrical codes.
FIRE HAZARD
Failure to follow this warning could result in intermittent
operation or performance satisfaction.
Do not connect aluminum wire between disconnect switch
and condensing unit. Use only copper wire.
(See Fig. 13.)
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
FILTER
ELEMENTS
FILTER
RETAINER
CLIP
FAN SCROLL
CONDENSATE
DRAIN
CONNECTION
(HORIZONTAL)
MOTOR
AND DRIVE
FAN
CONTACTOR
BOX
WIRE
ACCESS
COIL
FAN DRIVE
PULLEY
TXV BULB
ACCESS
REFRIGERANT/
CHILLED WATER
PIPING ACCESS
CONDENSATE
DRAIN
CONNNECTION
(VERTICAL)
LEGEND
TXV — Thermostatic Expansion Valve
2 3 2 2 2 1
1 3 1 2 1 1
1 0 5 ° C
6 00
V
R J
A
W
FAN
CONTACTOR
24V
TERMINAL
BLOCK
POWER
WIRING
KNOCKOUT