Air Conditioner User Manual

Page 11
XC21 SERIES
STEP 5 −− ELECTRICAL −− Circuit Sizing and Wire Routing
In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).
Refer to the furnace or air handler installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
24VAC TRANSFORMER
Use the transformer provided with the furnace or air han-
dler for low-voltage control power (24VAC − 40 VA mini-
mum)
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be grounded in
accordance with national and local
codes.
Line voltage is present at all components
when unit is not in operation on units with
single-pole contactors. Disconnect all
remote electric power supplies before
opening access panel. Unit may have
multiple power supplies.
IMPORTANT !
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start−up to pre-
vent compressor damage as a result of slugging.
CAUTION
ELECTROSTATIC
DISCHARGE
(ESD)
Precautions and
Procedures
Electrostatic discharge can affect
electronic components. Take care
during unit installation and service to
protect the unit’s electronic controls.
Precautions will help to avoid control
exposure to electrostatic discharge by
putting the unit, the control and the
technician at the same electrostatic
potential. Touch hand and all tools on an
unpainted unit surface before
performing any service procedure to
neutralize electrostatic charge.
Refer to the unit nameplate for minimum circuit
ampacity, and maximum fuse or circuit breaker size
(HACR per NEC). Install power wiring and properly
sized disconnect switch.
NOTE  Units are approved for use only with copper
conductors. Ground unit at disconnect switch or
connect to an earth ground.
SIZE CIRCUIT AND INSTALL DISCONNECT
SWITCH
1
NOTE  24VAC, Class II circuit connections are made
in the control box.
Install room thermostat (ordered separately) on an
inside wall in the center of the conditioned area and
5 feet (1.5m) from the floor. The thermostat should
not be installed on an outside wall or where it can be
affected by sunlight or drafts.
THERMOSTAT
INSTALL THERMOSTAT
2
SERVICE
DISCONNECT
SWITCH
5 FEET
(1.5M)
FIGURE 12