6. ELECTRICAL WIRING
ELECTRICAL SHOCK HAZARD.
Failure to follow this warning could result in personal
injury, death, and/or property damage.
The unit cabinet must have an uninterrupted,
unbroken electrical ground to minimize the possibility
of serious injury if an electrical fault should occur.
This ground may consist of an electrical wire
connected to the unit ground lug in the control
compartment, or conduit approved for electrical
ground when installed in accordance with National
Electric Code (NEC) NFPA 70, National Fuel Gas Code
NFPA 54-2005/ANSI Z223.1-2005 and local electrical
codes. In Canada, follow Canadian Electrical Code
CSA (Canadian Standards Association) C22.1 and
local electrical codes.
REDUCED EQUIPMENT LIFE HAZARD
Failure to follow these cautions could result in damage
to the unit being installed.
1) Make all electrical connections in accordance with
National Electric code (NEC) NFPA 70, National Fuel Gas
Code NFPA 54-2005/ANSI Z223.1-2005 and local
electrical codes governing such wiring. In Canada, all
electrical connections must be in accordance with CSA
standard C22.1, Canadian Electrical Code Part 1, and
applicable local codes. Refer to unit wiring diagram.
2) Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit. DO
NOT USE ALUMINUM WIRE.
3) Be sure that high-voltage power to unit is within
operating voltage range indicated on unit rating plate.
4) Do not damage internal components when drilling
through any panel to mount electrical hardware,
conduit, etc. Consult local power company for
correction of improper voltage and/or phase imbalance.
For access, remove the burner access panel. See Figure 1
for access panel location. Wiring MUST be protected from
possible mechanical damage.
Disconnect Switch
The unit must have separate electrical service with a
field-supplied, waterproof, disconnect switch mounted at,
orwithin sight from, the unit. Refer tothe unit rating plate for
maximum fuse/circuit breaker size and minimum circuit
amps (ampacity) for wire sizing.
Ground Connections
Do NOT complete line voltage connections until unit is
permanently grounded. All line voltage connections and the
ground connection MUST be made with copper wire.
A ground lug is installed in the control box area for the
ground connection. Use a copper conductor of the
appropriate size from the unit to a grounded connection in
the electrical service panel or a properly driven and
electrically grounded ground rod. See warning above.
11ol
Line Voltage Wiring
Connections for line voltage are made in the unit control box
area. Refer to wiring diagram located on the Burner Access
panel. For access, remove the burner access panel.
1. Run the high voltage (L1, L2) and ground leads into the
control box.
2. Connect ground lead to chassis ground connection.
3. Connect L1 to pressure lug connection 11 of the
compressor contactor.
4. Connect L2 to pressure lug connection 23 of the
compressor contactor.
Thermostat / Low Voltage Wiring
Location of the thermostat has an important effect on home
comfort. FOLLOW THE THERMOSTAT INSTRUCTION
MANUAL FOR CORRECT LOCATION, MOUNTING, AND
WIRING.
Atwo-stage dual fuel-compatible thermostat is required for
proper operation. Thermostat should have the following
terminals: "R', "W2", "YI", "Y2", "G'. and "O". Some
electronic thermostats use low voltage from the unit for
power for temperature display and programming. These
electronic thermostats will have a"C" terminal. The outdoor
unit has color-coded wires for easy connection. Using wire
nuts, follow figure 9 for proper connections:
FIGURE 9 Thermostat Connections
_ ..1_- Red
White
Yellow
Pink
@..1_ Green
_ ..IP- Orange
Typical
Mechanical
Thermostat
Subbase
=1_ Red
White
Y_ _ Yellow
Pink
_ ..1_- Green
_ ..1_- Brown
_ ..IP,- Orange
Typical
Electronic
Thermostat
Subbase
THERMOSTAT HEAT ANTICIPATOR
Some thermostats have an adjustable heat anticipator. The
heat anticipator prevents temperature overshoot in heating
mode. If the heat doesn't turn off until the set point
temperature on the thermostat is exceeded, then the
anticipator setting is too low. If the heat turns off before the
thermostat reaches the set point temperature on the
thermostat, then the anticipator setting is too high. Follow
the thermostat instruction manual for proper adjustment of
the heat anticipator.
BALANCE POINT TEMPERATURES
The dual fuel models require a dual fuel thermostat for
proper operation. A dual fuel thermostat allows a balance
point temperature to be programmed into the thermostat
and has an outdoor temperature sensor that must be
installed outside. Follow the thermostat installation
instructions for proper location of outdoor sensor. The dual
fuel unit operates either in heat pump mode or gas heat
mode, but NEVER both modes at the same time.
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