2.
3.
4.
5.
Check oil sump by hand touch to see that oil heaters have
been energized during the shutdown. Check position of
all valves to assure valves are open.
Verify that all condenser and chilled water valves are in
proper starting mode.
All safety indicator lights on the control panel should be
out for proper starting mode. If any light is on, consult the
Troubleshooting Guide.
Visually check the oil level in the sightglass. In the
PEH/PHH050 units, this sightglass is in the front end of
the compressor; all larger units have this sightglass as part
of the oil pump.
STARTING THE CHILLER
1. Start the chiller water pump and verify that proper flow
has been established.
2. Position the ON-OFF switch on the control panel to the
ON position. A self-contained light will glow.
3. Assuming that the chilled water temperature is above the
setting of the Load Recycling Thermostat and the unit has
been off more than 20 minutes, the pump will start.
4. After the 60 second prelube operation of the oil pump, the
condenser water pump will be started. As soon as all in-
terlocks verify condenser water flow, the compressor will
be started and the COMP RUN light on the control panel
will glow.
5. The control module will take over load/unload functions
in response to chilled water temperature. Normally, the
compressor will load to full load according to the settings
of the control module ramp-up control.
OPERATING CHECKS
1. While operating under automatic control, the operator
should observe the discharge, suction, and oil pressure
and verify that these pressures are normal. For R12 units,
discharge pressure can range from 90 psig to 150 psig
and suction pressure from 35 psig to 50 psig, depending
on load conditions and system operating characteristics.
Check the operating refrigerant pressures against design
conditions. Oil pressure must be 50 psig above suction
pressure to keep the compressor on line. Normal oil
pressures are: CEO50 - 150 to 175 psig; CE063,079,087,
100 - 120 psig; and CE126 - 100 psig. All pressures
are oil gauge reading minus suction gauge reading.
2. Observe the loading and unloading of the compressor by
the red and green lights on the control module. If short
cycling, refer to the Troubleshooting Guide and take cor-
rective action.
3. Each time the compressor is shut down on control of the
Load Recycle Thermostat, the LOAD RECYCLE light will
FIGURE 10. PEH126 CHILLER
LEGEND
1
CE126 Compressor
7.
Liquid
Line Shutoff Valve 13. Compressor Support
2. Oil Filter 6. Expansion Valve 14. Motor Cooling Liquid Line
3. Discharge Check Valve 9. Oil Coolers 15. Lube Box
4. Control Panel 10. Oil Pump 16. Relief Valves
5. Evaporator 11. Oil Level Sightglass 17. Compressor Motor Terminal Cover
6. Condenser 12. Oil Reservoir
IM 307 / Page 13
