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Installer's Guide
Electrical Wiring
L
!
SAFETY HAZARD!
To prevent injury or death due to electrical shock or contact with moving
parts, lock unit disconnect switch in open position before servicing unit.
Note: This unit is factory wired for 230V. See wiring diagram for 208V
conversion.
Electrical Connections
Electrical wiring and grounding must be installed in accordance with local codes
or, in the absence of local codes, with the National Electrical Code ANSI/NFPA
70, Latest Revision (N.E.C.).
Electrical Power
It is important that proper electrical power be available for the unit. Voltage varia-
tion should remain within the limits stamped on the unit nameplate.
Disconnect Switch
Provide an approved weatherproof disconnect within close proximity and within
sight of the unit.
Over Current Protection
The branch circuit feeding the unit must be protected as shown on the unit's
rating plate.
Power Wiring
The power supply lines must be run in weather-tight conduit to the disconnect
and into the bottom of the unit control box. Provide strain relief for all conduit with
suitable connectors.
Provide flexible conduit supports whenever vibration transmission may cause a
noise problem within the building structure.
Ensure all connections are made tight.
1. For branch circuit wiring (main power supply to the unit
disconnect), wire size for the length of run should be deter
mined using the circuit ampacity found on the unit nameplate and the N.E.C.
2. For more than 3 conductors in a raceway or cable, see the N.E.C. for derating
the ampacity of each conductor.
3. Wire size is based on 75 degrees C rated wire insulation.
Grounding: The unit must be electrically grounded in accordance with
local codes or the National Electric Code.
Accessories
All electrical accessories must be installed and wired according to the instructions
packaged with the accessory.
Control Wiring (Class II)
Low voltage control wiring should not be run in the same conduit with the power
wiring unless Class I wire of the proper voltage rating is used. Route the thermostat
cable or equivalent single leads of No. 18 AWG colored wire from the thermostat
subbase terminals through the rubber grommet on the unit. See Figure 1 for the
control entry location. Make connections as shown on the unit wiring diagram
and in Figures 5 and 6.
Do not short thermostat wires since this will damage the control transformer.
Recommended wire sizes and lengths for installing the unit thermostat are provided
in Table 1: Thermostat Wire Size and Maximum Length. The total resistance of
these low voltage wires must not exceed one (1) ohm. Any resistance in excess
of one (1) ohm may cause the control to malfunction because of the excessive
voltage drop.
Page 10
WARNING
IMPORTANT: Upon completion of wiring check all electrical connec-
tions, including factory wiring within the unit. Make sure all connections
are tight. Replace and secure all electrical box covers and access doors
before leaving the unit or turning on the power to the unit.
After all electrical wiring is complete, set the thermostat system switch on the OFF
position so that the compressor will not run and then apply power by closing the
system main disconnect switch. This will activate the compressor sump heat. Do
not change the Thermostat System Switch until power has been applied long enough
to evaporate any liquid R-410A in the compressor. It is recommended that the
sump heat be energized for a minimum of eight (8) hours prior to starting the unit.
Table 1. Thermostat Wire Size and Maximum Length
WIRE SIZE
18
16
14
MAXIMUM LENGTH (Ft)
75
125
200
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