Electrical connection, Attention installer, Incoming module power wiring – ClimaCool UCR 30, 50 and 70 tons Manual User Manual
Page 21: Coollogic control system wiring, Electrical phase sequencing, Danger, 3 phase scroll compressor units
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Electrical Connection
The compliance of the installation to relevant local and
national codes is the responsibility of the installer. Before
carrying out any electrical work, confi rm that the main
supply is isolated. The installer must ensure that the correct
electrical drawing is available. Before power is applied to
the system, the wiring should be visually inspected for loose
connections or grayed terminal connections. All control
wiring should follow wiring instructions supplied in the
project submittal package.
Incoming Module Power Wiring
The power for all modules is taken from a suitable fused
disconnect power supply within the main panel and the
electrical service enters the individual units through the top
into the units control panel enclosure. Proper grounding of
the module is mandatory. A typical power wiring is located
on page 65 – Power Distribution Drawing. The power for all
individual modules shall be in compliance with all local and
national codes.
CoolLogic Control System Wiring
A separate 115 volt power supply is required to power the
CoolLogic Master Control Panel. Communication between
Master Control Panel and chiller modules require a simple
two-conductor, 16 gauge shielded cable rated at 60°C
minimum, daisy chain connection. Control wiring cannot be
installed in the same conduit as line voltage wiring or with
wires that switch highly inductive loads such as contactor
and relay coils. Refer to the Power Distribution schematic on
page 65 of this manual for more information. All wiring shall
be in compliance with all local and national codes.
Electrical Phase Sequencing
Proper clockwise rotation for scroll compressor motors is
important to prevent damaging the compressors. ClimaCool
recommends the use of a phase sequence indicating
instrument following the manufactures directions. Another
alternative would be to “bump test” the compressors one
at a time with pressure gauges attached to the high and
low gauge ports of the compressors to check for proper
rotation. Energize the compressor for a few seconds to
ensure the discharge pressure gauge increases signifi cantly.
If the discharge pressure does not increase, proper
rotation is reversed. Compressor rotation can be reversed
by opening the main electrical disconnect and switching
any two of the main power supply leads feeding that
compressor’s contactor.
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