1. Mounting:
Fix the compressor rigidly with horizontal position and also provide vibration dampers for absorb vibration during running time and compressor should be move to other place by using fork lift only.
2. Capacity control of reciprocating compressor:
Normal operation: In normal operation the compressor works with on all cylinders. The solenoid valve is de-energized; the gas ports in the valve plate and cylinder head are opened.
Part load operation: In part load operation the pistons of this cylinder row run idle without gas pressure. The remaining performance totals approx. 50%with 4 cylinder compressors and approx. 33% resp. 66% with 6 cylinder compressors. The solenoid valve is energized; the suction port in the corresponding cylinder head is shut off by means of a servo valve.
3. Application Range:
The compressor should be designed for particular refrigerants, lubricating oil and also the operating conditions. According to the operating envelope, it can be used separate applications.
4. Installation procedure:
· Check the selected location for the Unit to ensure that rack, flooring foundation etc. are adequate to support the weight of the unit.
· Pressurize and leak test the entire system including the condensing unit, Evaporator and all connected tubing, fitting and brazed joints properly using the nitrogen for leak testing.
· The unit must be securely installed on a stable and rigid support, and fix from the beginning.
· It is recommended to install the Unit on rubber grommets or vibration dampers.
· Connect the Unit to the system as soon as possible to avoid oil contamination from ambient moisture.
· Avoid material entering into the system while cutting tubes. Never drill holes where burrs cannot be removed.
· Braze with great care using state-of-the-art techniques and vent piping with nitrogen gas flow.
5. Piping connections:
In order to make the connections, suction, discharge and liquid line piping with the correct diameters as the connections fitted on the machine must be provided.
6. Electrical connections:
· Ensure that power supply cannot be switched on during installation.
· All electrical components must be selected as per local standards and unit requirements.
· Refer to wiring diagram for electrical connections details.
· Ensure that the power supply corresponds to the unit characteristics and that the power supply is stable (nominal voltage ±10 % and nominal frequency ±2.5 Hz).
· Dimension the power supply cables according to unit data for voltage and current.
· Protect the power supply and ensure correct earth connection.
· Make the power supply according to local standards and legal requirements.
· Connect line phases L1, L2 and L3 to main switch terminals T1, T2 and T3, respectively.
7. Checks during Startup:
· Never start the Unit when no refrigerant is charged.
· All service valves must be in the open position.
· Check compliance between Unit and power supply.
· Check that the crankcase heater is working.
· Check the oil level in the compressor.
· Balance the HP/LP pressure.
· Energize the Unit, it must start promptly. If the compressor does not start, check wiring conformity, voltage on terminals and sequence phase.
8. Check list with running unit:
· Check current draw and voltage of compressor.
· Check suction super-heat to reduce risk of slugging.
· When a sight glass is provided, observe the oil level at start and during operation to confirm that the oil level remains visible.
· Check the operating limits of the compressor.
· Check all tubes for abnormal vibration. Movements in excess of 0.06 inch require corrective measures, such as tube brackets.
· Check the crankcase heater working properly.
· Check the pressure of suction and discharge side of the compressor.
9. Maintenance
· In the event when machine parts need replacing, use manufacturer’s original parts only.
· Regularly check the oil level in the compressor using oil sight glass.
· Check that all electric terminals, both on electrical panels and terminal boards are properly connected and also check carefully that all fuse elements are correctly clamped.
· Check the noise level of the compressor. This check must be performed with caution, as it has to be carried out while the system is operating.
· Check for ticking or vibrations that result from breakdowns or excessive mechanical friction between moving parts.
· Check the crank case heater and pressure transmitter properly.
· Ensure that periodic service inspections to ensure system reliability and as required by local regulations are performed.
