1. After releasing the pressure, remove the suction and discharge connection blanking plates from the
new compressor.
2. Attach the suction, discharge, and economizer (if applicable) connections. Solder all joints according to
approved practice ensuring that dry nitrogen is used at all times.
3. Ensure flange surfaces are clean and free from debris. Install new O-rings.
• • • CAUTION • • •
Ensure the discharge line is fitted with a non-return valve. During a surge condition or shutdown, the non-return valve prevents reverse
flow into the discharge port, which can cause damage to compressor components. Dry-fit the pipework to the valves and verify the
connections are aligned and there is no strain on the joints.
4. Attach the motor-cooling connection at the rear of the compressor. This connection is a 1/2 inch O-ring
face seal connection ( Figure 20-5 Motor-Cooling Connection and Access Port).
5. Perform a leak test, evacuation, and charge according to industry standards.
Figure 20-5 Motor-Cooling Connection and Access Port
20.6 Control Wiring
The compressor I/O board enables communication of control and status signals between the compressor controller
and external equipment. These signals include, among others, cooling demand, input, stepper motor control inputs
and outputs, alarm and interlock contacts, and Modbus protocol communications.
20.6.1 Control Wiring Connections
Figure 4-1 Typical Control Wiring shows the control wiring connections to the compressor I/O board. Table 4-1
Control Wiring Details provides details for the module terminal connections.
• • • CAUTION • • •
Incorrect wiring of the terminals can severely damage the module and other components.
Page 118 of 136 - M-AP-001-EN Rev. S 9/8/2021
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