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Operation l 4-7
4
Operation
Chiller Operation Sequence (continued)
5 The condenser fan can energize anytime the toggle switch is in the “On”
or “I” position. The fan is controlled by the fan cycling (high refrigeration)
pressure switch. This switch maintains the high side refrigeration pressure
under cooler ambient temperatures and lower loads. The fan will turn on when
the high refrigeration pressure reaches 200 PSI {13.8 bar}. It will turn off
when the pressure drops below 125 PSI {8.6 bar}.
6 The high refrigeration safety pressure switch shuts off the compressor
immediately when the high refrigeration pressure reaches 230 PSI
{15.9 bar} without going through pump down during a low pressure cycle.
If the high pressure switch trips, it must be manually reset by pressing the
“Reset” button on the switch. The compressor can start immediately when
this is reset so caution should be exercised. See Operation section entitled,
Resetting the Compressor’s High Pressure Switch.
CAUTION: The compressor can start immediately when the High Pressure “Reset”
button is pressed.