Frick Rotary Screw Compressor RWF II 472 SS

WARNING: This section must be read and understood before attempting to perform any maintenance or service to the unit.

If unit is running, press [stop] key.

Disconnect power from unit before performing any maintenance.

Wear proper safety equipment when compressor unit is opened to atmosphere.

Take necessary safety precautions required for the refrigerant being used.

WARNING: Close all compressor package isolation valves prior to servicing the unit. Failure to do so may result in serious injury.

Keep refrigerant and oil clean and dry, avoid moisture contamination.

Warning: This procedure requires trained personnel with PPE!

EZ-CAL High pressure cut-out check valve test block

Is the EZ-CAL test block installed on the package?

Is the pressure transducer wired to the Quantum HD controller?

Is the tubing run to the compressor discharge connection?

Is the HPCO fully open to the discharge pressure source in the RUN position?

Is the external source connected directly to the HPCO in the TEST position?

Is the HPCO confirmed to trip the compressor at the correct set point?

Warning: This procedure requires trained personnel with PPE!

The Oil Level Transmitter is located on the front of the separator near the bottom/center.

The linear transmitter with hermetic enclosure is based on the capacitive measuring principle.

It features removable electronics (from the sensor well) eliminating the need to evacuate the compressor for replacement. This transmitter is dedicated to oil level control and has no user adjustments.

Remove DIN connector plug from transmitter.

Warning: Follow all safety guidelines and procedures when replacing the pressure transducer.

Applicable transducer isolation valve closed

To change the discharge pressure transducer (PE-3), it will be necessary to depressurize the entire compressor package. Follow 'General Instructions For Replacing Compressor Unit Components' before going to step 3.

Wiring harness connectors identified

Wiring harness connector disconnected from transducer

Transducer unscrewed using a wrench on the metal hex at the base of the transducer

Wiring harness reconnected to the transducer

Shut down the compressor and allow pressures to equalize.

Isolate suction transducer PE-4 from the unit and depressurize.

Measure voltage across the red and black wires of the transducer.

Ensure that the transducer has proper voltage for excitation.

Measure the voltage of PE-4 on connector P6A on the Analog Board.

Check if the voltage reading is within the standard atmospheric pressure range.

Isolate the oil pressure transducer PE-1 from the package and open it to atmosphere.

Measure the voltage of PE-1 on connector P5A on the Analog Board.

Check if the voltage reading is within the standard atmospheric pressure range.