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Electrical Data
ELECTRICAL CONNECTION
CLIV units can be ordered with standard multi-point power
connections or with optional single-point connections and various
disconnect and circuit breaker options. Wiring inside the unit is
sized in accordance with the NEC®.
The required field wiring varies depending on the configuration
of the unit.
Voltage limitations are:
1. Within 10 percent of nameplate rating.
2. Voltage unbalance must not exceed 2 percent. Since a volt-
age unbalance of 2 percent can cause a current unbalance of
6 to 10 times the voltage unbalance per NEMA MG-1, it is im-
portant that phase-to-phase unbalance be kept to a minimum.
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DANGER
Qualified and licensed electricians must perform wiring.
There is an electrical shock hazard that can cause serious
injury or death.
!
DANGER
LOCK OUT / DISCONNECT all power sources before
starting, pressurizing, depressurizing or shutting down
the chiller. Disconnect electrical power before servicing
equipment, including condenser fan motors or compressors.
More than one disconnect may be required to deenergize
the unit. Failure to comply with this warning can result in
serious injury or death. Be sure to read and understand
the installation, operating and service instructions in this
manual.
Chiller electrical wiring connections may be made with copper
wiring, provided the size and number of wires match the chiller
terminals. All wiring must be in accordance with applicable
local and national codes, including NECA/AA 10402012 for
installation of aluminum wiring in buildings (ANSI).
1. The control transformer is supplied and no separate 115V
power is required. For single and multipoint power connec-
tions, the control transformer is on circuit #1 with control pow-
er wired from there to circuit #2. For multipoint power, discon-
necting power from circuit #1 disconnects the control power
from the unit.
2. The size of the wiring supplied to the control panel shall be in
accordance with the field wiring diagram.
3. The single point power supply requires a single disconnect
to supply electrical power to the unit. This power supply must
have a fuse or use a circuit breaker.
4. All field wiring terminal range values listed in the unit selection
report apply to 75°C cable per NEC.
5. It must be grounded per national and local electrical codes.
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CAUTION
Static discharge during handling of the circuit boards can
cause damage to the components. Use an antistatic strap
before performing any maintenance work. Never unplug
cables, circuit board terminal blocks or plugs while the panel
is powered.
USE WITH ON-SITE GENERATORS
Switching from site mains to generator power and vice versa
requires the chiller to be off or the power to be disconnected for
more than five seconds to avoid sending out-of-phase voltage to
the chiller. A properly installed and fully synchronized automatic
transfer switch must be used to transfer power if the chiller is
operating under load.
Generator sizing
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WARNING
The generator should be sized by an electrical engineer
familiar with generator applications.
Transfer Back To The Grid
Proper transfer of power from the standby generator to the grid
is essential to prevent damage to the chiller and must be used to
ensure proper operation of the unit.
!
WARNING
Stop the chiller before transferring power from the generator
to the mains. Transferring power while the chiller is running
can cause serious damage to the chiller.
The procedure required to reconnect generator power to the grid
is as follows:
1. Set the generator to always run five minutes longer than the
unit start timer, which can be set from two to sixty minutes,
while keeping the chiller powered by the generator until the
fully synchronized Automatic Transfer Switch properly deliv-
ers chiller power from the site.
2. Set the transfer switch supplied with the generator to automat-
ically shut down the chiller before the transfer is made. The
automatic shutdown function can be accomplished through a
BAS interface or with the "remote on/off" wiring connection
shown in the field wiring diagrams.
A start signal can be given at any time after the stop signal, as the
three-minute start timer will be in effect.
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