Frick Rotary Screw Compressor RWF II 399

General instructions for replacing compressor unit components

See Publication 070.660-SM for procedures covering replacement motor and compressor mounting.

When replacing or repairing components which are exposed to refrigerant pressure (including suction strainer) proceed as follows:

1. Push [STOP] key on control panel to shut down unit.

2. Open disconnect switches for compressor and pump motor starters.

3. Close suction and discharge service valves, also liquid injection and economizer service valves, if applicable.

4. Slowly vent separator to low-side system pressure using the bypass line on the suction trap.

Capacity linear transmitter – slide valve

The Capacity Linear Transmitter is located on the end of the compressor unload cylinder, see Figure 49.

The linear transmitter with hermetic enclosure is based on the inductive measuring principle. It features removable electronics (from the sensor well) eliminating the need to evacuate the compressor for replacement. This type of transmitter is dedicated to capacity control and is not adjustable.

2. Remove DIN connector plug from transmitter.

5. Install new transmitter unit.

Periodic vibration analysis can be useful in detecting bearing wear and other mechanical failures. If vibration analysis is used as a part of your preventive maintenance program, take the following guidelines into consideration.

1. Always take vibration readings from exactly the same places and at exactly the same percentage of load.

2. Use vibration readings taken from the new unit at start-up as the base line reference.

3. Evaluate vibration readings carefully as the instrument range and function used can vary. Findings can be easily misinterpreted.

4. Vibration readings can be influenced by other equipment operating in the vicinity or connected to the same piping as the unit.

Vibration analysis is recommended every 6 months to ensure that the internal components of the screw compressor are in compliance with expected vibration levels, based on the initial, full spectrum baseline performed at start-up.

If the Frick PhD on-board vibration monitoring system is utilized, the 6 month vibration analysis is not re-quired. Frick PhD provides continuous vibration monitoring that fulfills the maintenance requirement.

If the Frick PhD has an alarm or shut down event, a full spectrum vibration analysis would then be required to specifically identify the cause of the alarm or shut down.

Performing a few preventive maintenance procedures will extend the life of your pump and reduce the cost per gallon pumped.

Packing adjustment - Occasional packing adjustment may be required to keep leakage to a slight weep; if impossible to reduce leakage by gentle tightening, replace packing or use different type.

End clearance adjustment - After long service the running clearance between the end of the rotor teeth and the head may have increased through wear to the point where the pump is losing capacity or pressure. Resetting end clearance will normally improve pump performance.

Sign off on the preventative maintenance

High quality refrigeration oil is necessary to ensure compressor longevity and reliability. Oil quality will rapidly deteriorate in refrigeration systems containing moisture and air or other contaminants. In order to ensure the quality of the refrigeration oil in the compressor unit.

Do not mix oils of different brands, manufacturers, or types. Mixing of oils may cause excessive oil foaming, nuisance oil level cutouts, oil pressure loss, gas or oil leakage and catastrophic compressor failure.

The Frick oil charge shipped with the unit is the best suited lubricant for the conditions specified at the time of purchase. If there is any doubt due to the re-frigerant, operating pressures, or temperatures, refer to Frick Oil publication 160.802-SPC for guidance.

Only use Frick oil filter elements or warranty claim may be denied.

1. Participate in a regular, periodic oil analysis program to maintain oil and system integrity. Oil analysis kit part number: 333Q0001853.

2. Oil samples for analysis should be taken after the oil filter. A 1/4 in. purge valve is provided in the oil filter canister head.