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STEP 4 -- 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 handler
for low‐voltage control power (24VAC - 40 VA minimum)
WARNING
Electric Shock Hazard. Can cause injury or
death.
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.
SIZE CIRCUIT AND INSTALL SERVICE
DISCONNECT SWITCH
Refer to the unit nameplate for minimum circuit ampacity,
and maximum fuse or circuit breaker (HACR per NEC).
Install power wiring and properly sized disconnect switch.
MAIN FUSE BOX/
BREAKER PANEL
SERVICE
DISCONNECT
SWITCH
NOTE — Units are approved for use only with copper
conductors. Ground unit at disconnect switch or
connect to an earth ground.
Unit
must
be
grounded
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start-up to prevent
compressor damage as a result of slugging.
Electrostatic
electronic components. Take care during
unit installation and service to protect the
unit's electronic controls. Precautions will
ELECTROSTATIC
help to avoid control exposure to
DISCHARGE
electrostatic discharge by putting the unit,
(ESD)
in
Precautions and
the control and the technician at the same
Procedures
electrostatic potential. Touch hand and all
tools on an unpainted unit surface before
performing any service procedure to
neutralize electrostatic charge.
INSTALL THERMOSTAT
Install room thermostat (ordered separately) on an inside
wall approximately in the center of the conditioned area
and 5 feet (1.5m) from the floor. It should not be installed
on an outside wall or where it can be affected by sunlight
or drafts.
THERMOSTAT
5 FEET
NOTE — 24VAC, Class II circuit connections are made
in the control panel.
FIGURE 13
Page 11
IMPORTANT !
CAUTION
discharge
(1.5M)
can
affect
13ACX SERIES
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