Installation manual

Page 40 IM-487
Electrical Installation
Field Power Wiring
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.
Conduits connecting the unit to external panels will be
exposed to relative humidity and air pressure differentials
and should be sealed. Ground the motor using copper or
other corrosion resistant conductor.
Figure 44. Field Power Wiring
With Optional Electrical Power Package
Wiring must comply with all applicable codes and ordi-
nances. The warranty is voided if wiring is not in accordance
with these specifications.
According to the National Electrical Code, a disconnecting
means shall be located within sight of and readily accessible
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 overcurrent
protected at the point of distribution. The maximum allow-
able overcurrent protection is shown on the unit nameplate.
The RAH units may be ordered with internal power wiring
for either single or multiple point power connections. If sin-
gle point power is ordered, a single power block or an
optional disconnect switch is located within the main control
panel. Field power leads are brought into the unit through 3-
inch knockouts in the bottom of the main control panel. Refer
to Figure 45.
Units ordered with dual point power connections are pro-
vided with non-fused, factory mounted disconnect switches.
Disconnect DS1 handles the fan load and controls, and is
mounted within the main control panel. Disconnect DS3 han-
dles the electrical heat load and is located within the electric
heat control panel.
The minimum circuit ampacity (wire sizing amps) is shown
on the unit nameplate. Refer to Table 11 for recommended
number of power wires.
Hinge and
Latch Cap
Access
Panels
To p
Bottom
Must Seal
Access
Panel
Bottom
Base
Frame
DANGER
Hazardous voltage.
May cause severe injury or death.
Lock and tag out all 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.
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.