KIRLOSKAR KAC - Standard Controls; High Pressure Control; Low Pressure Control

KIRLOSKAR CHILLERS PRIVATE LIMITED
A Kirloskar Group Company IOM-KAC-ENG - Page 28
3.10. Standard Controls
3.10.1. High Pressure Control:
This is a manual reset type pressure controlled electromechanical device used as safety cutout
against high discharge pressure. When the discharge pressure OR saturated condensing pressure
increases beyond the high-pressure set point, this control opens the compressor motor power
circuit, causing the compressor to stop. Press manual reset button for resetting the controller.
Refer controls, setting and functions section for set point details.
Checking Control Operation - (This test has to be performed only in presence of Kirloskar
Chillers authorized service personal)
a) Observe the discharge pressure on the panel.
b) When the discharge pressure rises above the control cut-out set point, the control should stop
the compressor.
3.10.2. Low Pressure Control
This is an auto reset type pressure controlled electromechanical device used as safety cutout
against low discharge pressure.
When the suction pressure OR saturated evaporation pressure decreases below the low pressure
set point, this control opens the compressor motor power circuit, causing the compressor to stop.
Refer controls, setting and functions section for set point details.
Checking Control Operation - (This test has to be performed only in presence of Kirloskar
Chillers authorized service personal)
a) To check the control, either close the liquid line shut off valve or switch off the pilot solenoid
valve, which in-turn close the electronic expansion valve.
b) Observe the suction pressure on the panel.
c) When the suction pressure drops lower than the control set point, the control should stop the
compressor.
NOTE: ‘DO NOT RESET’ THE CONTROL UNLESS THE CAUSE
FOR TRIPPING DUE TO HIGH PRESSURE IS ASCERTAINED.