Installation manual

Page 26 / IM 178
Electrical Installation
Field Power Wiring
Wiring must comply with all applicable codes and ordi-
nances. The warranty is voided if wiring is not in accordance
with these specifications. An open fuse indicates a short,
ground, or overload. Before replacing a fuse or restarting a
fan motor, the trouble must be found and corrected.
According to the National Electrical Code, a disconnect-
ing means shall be located within sight of and readily acces-
sible from the air conditioning equipment. The unit may be
ordered with an optional factory mounted disconnect switch.
This switch is not fused. Power leads must be over-current
protected at the point of distribution. The maximum allow-
able overcurrent protection is shown on the unit nameplate.
Without optional electrical power package
All of the unit side panels are hinged. Disconnect switches
and/or motor starters must not be mounted on panels which
provide access to internal components. Wiring conduits can
penetrate the cabinet bottom, base frame or through the hinge
and latch cap without interfering with the access panels.
Note: All holes cut into the unit must be sealed to prevent
water leakage.
Hazardous voltage. May cause severe injury or death.
Disconnect electric power before servicing equipment.
More than one disconnect may be required to de-
energize the unit.
If the unit has a factory mounted disconnect switch,
the switch must generally be turned off to open the main
control panel door. However, the door can be opened
without disconnecting power by turning the screw at the
bottom of disconnect switch clockwise while pulling the
door open. If this is done, however, caution must be
used since power is not removed from the unit or the
controller.
Figure 21.
Must Seal
Base
Frame
Access Panel
Bottom
Hinge &
Latch
Cap
Access
Panels
!
WARNING
Conduits connecting the unit to external panels will be
subjected to relative humidity and air pressure differentials
and therefore should be sealed. Motor should be grounded
using copper or other corrosion resistant conductor.