WLCG/WLHG
High-Wall Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
36
P/N 240008111, Rev. G [06/18/10]
Troubleshooting
WARNING
Service should be performed by a
quali-
fied service agency
and an annual system
check is recommended.
Electrical shock hazard
— Before re-
moving access panels or control covers to
expose moving parts of non-insulated live
electrical components for service, discon-
nect all high volt power supplies to both
the indoor unit and outdoor unit. Failure
to do so could result in physical injury and/
or electrical shock.
Wiring diagram
When trouble-shooting the indoor unit,
please refer to the wiring diagram that is sup-
plied with the equipment.
The wiring diagram is located on the
•
inside surface of the left end cap.
Access the wiring diagram and wiring fol-
•
lowing the procedure on page 9.
If you are unable to locate the wiring
•
diagram, please call the factory technical
service line at (800) 228-9364, and one
can be faxed, mailed or e-mailed. Please
have the full model and serial number
available prior to calling.
Wiring requirements
EMI Series air handlers are designed to oper-
ate with EMI Series condensers.
The air handler (indoor unit) and con-
•
denser (outdoor unit) must be indepen-
dently connected to the electrical service
panel and protected by separate time
delay fuse or HACR breakers. (See the
unit name plate for the correct breaker
type and size).
The indoor and outdoor units are also
•
connected to each other via a 24V inter-
connect wiring.
A transformer provides the low volt power
•
source for the controls. The number of low
volt interconnect conductors will be two
to six depending on heating options and
or thermostat selection.
Wiring connections — straight
Figure 36
cool applications
Wiring connections — heat
Figure 37
pump applications
Wiring connections — straight
Figure 38
cool applications with wall
thermostat
