Initial start-up of condensing unit.
Before compressor can start, all safety control contacts must be closed, cooling water flow to the
condenser closes the cooling water pressure switch contact. High pressure, oil failure and high
pressure switch must be in close position.
   
1.
Crank case heater should be energized a minimum of 24 hours before starting compressor.
2.
Check to see that proper oil level appears in compressor sight glass.
3.
Open water supply valve to condenser and allow water to reach condenser.
4.
Open compressor suction and discharge shut-off valves.
Be sure all valves in refrigerant line are opened.
5.
If compressor is shut-off by safety control, do not permit control to reset more than once
before determining cause of shutdown.
6.
Check the high pressure safety switch by throttling condenser water allowing head pressure to
gradually rise. Check compressor discharge pressure constantly through this procedure.
  Compressor should shut-off within 1kg/cm2 of values shown on table below.
Instruments
Control Press (kg/cm2)
Remarks
Comp start (cut in)
Comp stop (cut out)
High Press. Switch
Manual reset
19.0
`
Low Press. Swich
0.6
1.6
`
Oil Press. switch
Manual reset
0.4
Time delay 60 sec.
7.
Check low pressure safety switch by slowly closing suction shut-off valve.
A decrease of suction pressure will follow. Check compressor suction pressure gauge
throughout this procedure
(compressor should shut-off within 0.3kg/cm2 of the value shown on the table above 6).
8.
The oil failure switch may be checked by removing contact arm forward.
Compressor should stop in approximately 45-60 seconds.
After completing test, press start button on front of safety switch and restart compressor.
Allow 3 minutes before attempting to reset switch.