Initial start-up of equipments.
Central air handling unit
  Turn all circuit breakers to the "ON" position. Turn the selector switch to either the heat or cool
  position. The fan motor are started by depressing the appropriate start pushbutton.
 
  Cooling - Refrigerant solenoid valve is controlled by remote thermostat
    Upon a rise in temperature, the thermostat opens the solenoid valve.
    Upon a drop in temperature, the thermostat closes the solenoid valve, shutting off the
    refrigerant flow to the evaporator coil.
  Heating - Upon a drop in temperature, the thermostat drives the SCR to supply the current to elec. heater.
    Upon a rise above specified temperature, the thermostat drives the SCR to be closed
    and shuts off the current to elec. heater.
Depressing the stop pushbutton shuts the units off.
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 compressors 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
12.5
.
Low Press. switch
1.8
2.3
.
Oil Press. switch
Manual reset
2.5
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 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.