Emerson COPELAND H Series User Manual page 18

Ensure that all service valves are open during the leak test process. It is important
to recheck all joints within the unit as well as the external joints.
- The unit is shipped with a holding charge of dry nitrogen and should be leak
free.
- Ensure that the test pressure do not exceed the system design pressures.
- Do not expose system pressure control LP to test pressures above the design
pressure. This can damage the pressure controls.
- Using an approved, calibrated electronic gas leak detector, leak test the entire
system paying attention to all joints (you might have to charge small quantity
of refrigerant before charging the Nitrogen to enable this procedure).
- Periodically check functionality of the electronic leak detector during this
process.
- To further check system integrity, spray a soapy water solution over joins then
visually inspect for bubbles.
- Leave the system under pressure for a designated period (24 Hours).
- Check and record the ambient temperatures and the system pressure with
calibrated approved instruments. This process is to be carried out every 8-12
hours during the pressure testing process.
- If the test pressures cannot be maintained, repeat the leak testing process
employing the isolation of sections of the system to determine the source of
leaks. Repair the leak and repeat the leak testing process until system can be
signed off as leak free and approved by authorized personnel.
- Record findings and confirm pressure testing process completion.
Evacuation
- After the system is leak checked, connect approved dual stage vacuum pump
sized to application with preferably fresh oil to evacuate the system.
- Ensure all inline system shut-off valves and solenoid valves are fully open.
- Evacuate the system to 300 microns.
- A triple evacuation is recommended in case of using analog gauges as we
might not know the exact vacuum level being achieved
Charging and commissioning
Reminder:
- The scroll compressor design requires system charging with liquid refrigerant
into the liquid line.
- Do not vapor charge the H-Series Scroll unit. After ensuring all valves are
opened and system is evacuated properly, only then start the refrigerant
charging process. Also ensure that LP cutout is not by-passed during the
charging process.
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