Step 8—Install Electrical Connection
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
The unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. This ground may
consist of an electrical wire connected to the unit ground
screw in the control compartment, or conduit approved for
electrical ground when installed in accordance with NEC
(National Electrical Code) ANSI/NFPA (latest edition) and
local electrical codes. In Canada, follow Canadian Electrical
Code CSA (Canadian Standards Association) C22.1 and local
electrical codes.
INSTALLATION REQUIREMENTS
Failure to follow these precautions may result in damage to
the unit being installed:
1. Make all electrical connections in accordance with NEC
ANSI/NFPA (latest edition) and local electrical codes
governing such wiring. In Canada, all electrical connec-
tions 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.
HIGH-VOLTAGE CONNECTIONS
The unit must have a separate electrical service with a field-
supplied, waterproof, disconnect switch mounted at, or within
sight from, the unit. Refer to the unit rating plate for maximum
fuse/circuit breaker size and minimum circuit amps (ampacity) for
wire sizing. See Table 3 for electrical data.
The field-supplied disconnect switch box may be mounted on the
unit over the high-voltage inlet hole when the standard power and
low-voltage entry points are used. See Fig. 2 & 3 for acceptable
location.
See unit wiring label and Fig. 10 for reference when making high
voltage connections. Proceed as follows to complete the high-
voltage connections to the unit.
Single phase units:
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.
SPECIAL PROCEDURES FOR 208-V OPERATION
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Make sure that the power supply to the unit is switched OFF
and lockout tag installed before making any wiring changes.
CONTROL VOLTAGE CONNECTIONS
NOTE:
Do not use any type of power-stealing thermostat. Unit
control problems may result.
Use no. 18 American Wire Gage (AWG) color-coded, insulated
(35 C minimum) wires to make the control voltage connections
Table 2—Minimum Airflow for Safe Electric Heater
Operation (Cfm)
SIZE
024
030
036
042
048
060
Cfm
800
1000
1200
1400
1600
1750
Fig. 9—Vertical Duct Cover Removed
C99012
DUCT COVERS REMOVED
9
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