ClimaCool UCA Manual - Manual (Page 19)

19
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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 circuit
breaker or fused disconnect power supply within the main
panel. The electrical service enters the individual units
through the control panel enclosure. Proper grounding of
the module is mandatory. A typical power wiring is located
on page 39 – Power Distribution Drawing.
CoolLogic Control System Wiring
A separate 115 volt power supply is required to power the
CoolLogic Master Control Panel. Communication between
the Master Controller and chiller modules requires 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 39 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.
Proper Voltage Balance
Occasionally, in three phase circuits, a voltage imbalance
occurs between phases. It is not recommended to operate
equipment when an imbalance greater that 2% occurs. This
causes motors to run at high temperatures and may aff ect
their longevity. The following example describes how to
calculate the average voltage of the three phases to see if
the imbalance is greater than 2%.
Example: Line 1 = 226v Line 2 = 230v Line 3 = 228v
The average is: (226+230+228)/3 = 228v
Next, [100(228-226)]/228 = 0.9%
The voltage imbalance of the three phase circuit is 0.9%. This
is well under the 2% range.
Voltage/Phase Monitor
Voltage/phase monitors are factory supplied, one required
per bank, for fi eld installation with the CoolLogic Master
Control Panel. The voltage/phase monitor helps guard the
chiller bank against voltage fl uctuations, phase failure or
phase reversal conditions. The voltage/phase monitor has
three wires that connect to the main three phase power
chiller bank input. Two low voltage control wires are
connected to the CoolLogic Master Control Panel and must
be run together with the power wiring. Do not install control
wiring in the same conduit as line voltage wiring or with
wires that switch highly inductive loads such as contactor
and relay coils.
Install one (1) monitor per bank at main power fi eld to
monitor the module.
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REFRIGERANT
WARNING!
WARNING! To avoid possible injury or death due to electrical
shock, open the power supply disconnect switch and secure it
in an open position during installation.
CAUTION!
CAUTION! Use only copper conductors for field installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.
ATTENTION INSTALLER
3 Phase Scroll Compressor Units
•If this unit uses a 3 Phase Scroll Compressor, the following
instructions MUST BE followed:
- Unit power supply MUST BE wired in the proper sequence
to avoid damage to the 3 Phase Scroll Compressor.
- Scroll Compressors with INCORRECT rotation show the
following characteristics:
1.) High sound level;
2.) High suction pressure and low discharge pressure;
3.) Low current draw.
- If any of the three above characteristics exist, swap two
of the three supply wires at the discount and recheck
compressor for incorrect rotation.