Electrical Connection - Compu-aire System 2100 Series Installation And Operation Manual

Note: Glycol and water cooled units are designed for maximum of 150 psig water pressure. Higher
pressure units are available; refer to unit nameplate.

6.2.5 Electrical Connection

The unit is completely factory wired with self-contained controls.
IMPORTANT - Before proceeding with the electrical connections, make certain that the volts, hertz
and phase correspond to that specified on the unit rating plate. Also, check to be sure that service
provided by the utility is sufficient to handle the additional load imposed by this equipment. Refer to
the unit rating plate for equipment electrical requirements. The attached wiring diagram shows the
proper high and low voltage field wiring.
Make all electrical connections in accordance with National Electrical Code and any local code
ordinances that may apply. USE COPPER CONDUCTORS ONLY.
WARNING -- The unit cabinet must have an uninterrupted or unbroken electrical ground to minimize
personal injury if an electrical fault should occur. It is important that an electrical ground wire of
adequate size can be connected to the ground lug provided inside the control box.
Supply voltage at the unit must be within + 10% of the voltage indicated on the nameplate for a dual voltage
rating, supply voltage must be within 5% from the lower nameplate rating and within 10% from the higher
rating. Phase to phase imbalance must not exceed 3%. Contact your local utility company for correction of
improper line voltage. Improper electrical power supply may cause premature failures and void unit
warranties
The system cutout terminals on the terminal strip are for connection to a "panic button" or remote
shut-off if required. This should only be connected to a switch and NO EXTERNAL SOURCE OF
POWER SHOULD BE INTRODUCED AT THIS POINT. The conductors should be sized depending on the
length of run and the number of control transformers used in the unit. Maximum voltage drop must
not exceed 1 volt. Each control transformer draws approximately 3 amps @ 24 V. For long runs
where the conductor size becomes too large, an interlocking relay (field provided) should be used.
A dry contact (24 volts rating) is provided for terminals for a remote alarm connection.
If the control panel includes a condensate probe, make sure it is mounted below the unit against the floor
area where water may collect. To check the operation of the probe, submerse it in a cup of water. The
condensate alarm should energize.
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