23
Note: All field installed wiring must conform to NEC
guidelines as well as State and Local codes.
Verify that the power supply available is compatible with the
unit’s nameplate ratings. The available supply power must
be within 10% of the rated voltage stamped on the name-
plate. Use only copper conductors to connect the power
supply to the unit.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to accept other types of
conductors. Failure to use copper conductors may result
in equipment damage.
Failure to do so may cause damage to the equipment.
Note: If the unit is not equipped with an optional
factory installed nonfused disconnect switch or
circuit breaker, a field supplied disconnect switch
must be installed at or near the unit in accordance
with the National Electrical Code (NEC latest edition).
Main Unit Power
Standard Wiring
1. Location of the applicable electrical service entrance is il-
lustrated in Figure 2. Complete the unit’s power wiring
connections at Compressor Contactor # 1 (CC1) inside
the unit control panel. Refer to the customer connection
diagram that is shipped with the unit for specific termina-
tion points
2. Provide proper grounding for the unit in accordance with
local and national codes.
Main Unit Power
Optional TBUE Wiring
(Through the Base Electrical Option)
1. Location of the applicable electrical service is illustrated
below. Refer to the customer connection diagram that is
shipped with the unit for specific termination points. The
termination points, depending on the customer option se-
lected would be a factory mounted nonfused disconnect
switch (UDC) or circuit breaker (UCB). If neither a factory
mounted nonfused disconnect switch (UDC) or circuit
breaker (UCB) was factory mounted, field wiring connec-
tions should be terminated in the control box at Com-
pressor Contactor # 1 (CC1).
2. Provide proper grounding for the unit in accordance with
local and national codes.
Note: Black Gasket is shipped from the factory and
is located in the literature Ship With bag in the control
box. Apply Black Gasket around conduit plate on all
4 sides after installation to prevent air leakage from
the building entering the electrical enclosures.
Installation
Note: Seal between wiring and conduit with Black
Gasket or weather proof sealer to prevent air
leakage from the building entering the electrical
enclosures. Also seal around conduit and wiring at
all roof and curb penetrations.
Field Installed Control Wiring
An overall layout of the various control options available
with the required number of conductors for each control de-
vice is illustrated in Figure 6.
Note: All field wiring must conform to NEC guidelines
as well as state and local codes.
Control Power Transformer
The 24 volt control power transformers are to be used only
with the accessories called out in this manual. Transformers
rated greater than 50 VA are equipped with internal circuit
breakers. If a circuit breaker trips, turn “Off” all power to the
unit before attempting to reset it.