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SECTION 3
REMOTE COOLING MODULE STARTERS
Connection of remote cooling module starters to ES+ control systems
The majority of our rotary screw compressor packages feature starters completely wired and tested at the
factory. Some applications and large units, however, will have the air cooled cooling module mounted
remotely from the compressor package. Standard practice is to provide a combination starter (with fused
disconnect) for the cooling module. The following information describes connection requirements for
these applications.
Starter
Regardless of starter type or brand, the following are required:
•
The starter must have an isolated 120 volt coil.
•
The starter must have an isolated (dry contact) normally closed overload relay contact.
•
The starter must have an isolated (dry contact) normally-open auxiliary contact.
Standard starters are generally provided by the manufacturer with interconnecting wires between the coil,
overload relay contact, and auxiliary contact. Remove all of these to isolate the three control
components.
Installation and wiring
The starter should be mounted and wired in accordance with the National Electrical Code and the
manufacturers instructions. Wiring from the load terminals of the starter to the motor should include
flexible conduit to the motor junction box to allow for normal movement of the motor in the package. Use
time-delay fuses in the disconnect, to allow for motor starting. Follow instructions in the starter for proper
sizing and application of overload heaters.
Install a separate conduit from the starter to the package control box for control wiring. Label five control
wires: 9 , 10 , 18 , 22 , 23 ; pull through this conduit.
Controls connections
Disconnect and remove any manual starter controls or other control wires which may be mounted on the
starter or elsewhere. The starter must be controller by the compressor controls for proper operation. The
following is general information; refer to the unit wiring diagram for detailed connection.
Connect the five control wires to terminals 9 , 10 , 18 , 22 , 23 in the compressor control box.
At the cooling module starter, connect wire 10 to one terminal of the starter coil, wire 18 to the other coil
terminal. Connect wire 9 to one terminal of the aux contact and to one terminal of the overload relay
contact terminal. Connect wire 23 to the other aux relay contact. Connect wire 22 to the other overload
relay contact terminal.
Summary of Contents for AUTO SENTRY-ES+
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