010-200002-000
Page 9
HB IOM 1.1 2-13-2014
INSTALLATION-ELECTRICAL
Typical wiring diagrams are shown on the fol-
lowing pages FOR REFERENCE. Always re-
fer to the wiring diagram on the air handling unit
for actual wiring.
Connect electrical service to unit. Refer to unit
wiring diagram
. NOTE:
CHECK MOTOR RAT-
ING PLATE FOR CORRECT LINE VOLTAGE.
For power supply connection, route field power
wiring to Motor Start/Stop Station (MSS) dis-
connect switch (if provided) or motor leads in
the junction box (j-box).
Refer to nameplate FLA, maximum overcurrent
protection device (MOPD) and minimum circuit
ampacity (MCA). Also refer to wiring diagram
affixed to unit to make control and power wiring
connections.
Installer is responsible for power wiring, branch
circuit over current protection,
NOTE
: Motor
provided
may or may not
have internal thermal
overload protection. Units ordered with Motor
Start/Stop (MSS) option or Factory Electric
Heat include motor starter with overload if re-
quired for the factory-provided motor.
WARNING!
Units ordered “j-box only” may
need additional field-provided motor overload
protection (all 3-phase motors and some single
phase motors).
NOTE: Units with Junction Box option have
4x4 J-box mounted on outside of unit. Refer to
dimensional drawings.
NOTE: Units with factory installed electric heat-
ers have fan starter and overload (if required)
located inside the electric heat control box.
DANGER
NEVER enter an enclosed fan cabinet or reach into
a unit while the fan is running.
LOCK OPEN AND TAG the fan motor power dis-
connect switch before working on a fan. Take fuses
with you and note removal on tag. Electric shock
can cause personal injury or death.
LOCK OPEN AND TAG the electric heat coil power
disconnect switch before working on or near heat-
ers.
Failure to follow these warnings could lead to per-
sonal injury or death.
DANGER
WARNING: Hazardous voltage.
Only qualified
personnel must install the electrical service. Dis-
connect and Lock Out all incoming power sources
before connecting to electrical service.
WARNING:
This appliance must be permanently
grounded in accordance with the National Electrical
Code and local code requirements.
WARNING
: For use with copper conductors only.
NOTE: When installing the AEH auxiliary elec-
tric heat accessory, the heater control box con-
tains the motor starter and allows for single-
point line connection (one power circuit for both
electric heater and fan motor). Motor overload
is provided, when required, with the motor start-
er.
WARNING: CHECK FACTORY OR FIELD
PROVIDED OVERLOAD DEVICE SETTING—
MAKE SURE IT IS EQUAL TO THE MOTOR
FLA AT RATED VOLTAGE. Improper setting
may result in equipment malfunction, equip-
ment failure, or fire or other hazardous con-
dition leading to property damage or per-
sonal injury or death.