ClimaCool IOM FLEX SERIES - Manual (Page 10)

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®
8
Connecting the Water Piping to Modules
Water piping must be installed in accordance with
applicable codes and standards. Flexible connections and
supports should be installed to prevent load or stress on the
module's flange connections (see page 10 - Water Piping
Configurations).
ELECTRICAL CONNECTION
The compliance of the installation to relevant codes is
the responsibility of the installer. Before carrying out any
electrical work, confirm that the main supply is isolated.
The installer must ensure that the correct electrical drawing is
available.
Inter-Module Power Wiring
The power for all modules is taken from a fused supply
within the main panel. A typical power wiring is located on
page 43 - Power Distribution.
Inter-Module Control Wiring
After the power wiring has been run, the control wires can
then be connected. The wires should be carefully marked
and installed in the terminals shown on the wiring diagram.
External control wires should be connected to the relevant
terminals and devices. Wiring to the sensors should not be run
with the power wiring.
Control Wiring Sizes and Lengths
When running control wires, proper gauged wires should
be used. With 14 AWG the maximum distance allowed is
250 feet. With 16 AWG, 100 feet is acceptable. You should
not exceed 50 feet when using 18 AWG. These lengths and
gauges are for the use of 24 volt control circuits.
Incoming Power Wiring
Incoming power should be supplied from a suitable
disconnect switch. Proper grounding of the module is
mandatory.
Electrical Phase Sequencing
Proper clockwise rotation for scroll compressor motors is
important to prevent damaging the compressors. If you
have access to a phase sequence indicating instrument it
is recommended to use this following the manufactures
directions. If not, you may “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 significantly.
If the discharge pressure does not increase, proper rotation
is reversed. You can quickly reverse compressor rotation 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 than 2% occurs. This
causes motors to run at high temperatures and may affect
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 one = 226v Line two = 230v Line three = 228v
The average is: 226+230+228 = 228v
3
Next, 100(228-226) = 0.9%
228
The voltage imbalance of the three phase circuit is 0.9%.
This is well under the 2% range.
Checking
Before power is applied to the system, the wiring should be
visually inspected for loose connections or frayed terminal
connections. All control wiring should follow wiring
instructions supplied in the project submittal package.
Electrical Connection
DANGER
!
• Electric shock hazard!
• May result in injury or death!
• Disconnect power supply(ies)
before servicing!
• Refer servicing to qualified
service personnel.
• Risque de choc électrique!
• Résultat de mai dans dommages
ou la mort!
• Debrancher avant d’entreprendre
le dépannage de l’appareil!
• Consulter un réparateur qualifie
pour le dépannage.
DANGER
!