KIRLOSKAR KAC - System Accessories; Preparing the System for Start-Up

KIRLOSKAR CHILLERS PRIVATE LIMITED
A Kirloskar Group Company IOM-KAC-ENG - Page 22
3.3.6. System Accessories
a) Compressor Isolation & Liquid Line Valves: Every hermetic type scroll compressor is
provided with ball valves in the liquid line. For easy service access in refrigerant side; service
valves are mounted at each suction, discharge and liquid lines. The Electronic expansion valve is
mounted on liquid line after the filter drier.
b) Liquid Line Filter Drier: The Filter drier assembly is provided on liquid line. This Filter drier
removes moisture as well as foreign particles.
3.4. Preparing the System for Start-Up
a) Crankcase heaters should be operated at least 24 hours prior to start- up.
b) With mains disconnect open, check all electrical connections in control panel and starter
to be sure they are tight and they provide good electrical contact. Although all the
connections are tightened at the factory, they might have loosened enough during
shipment, which may cause system malfunction.
c) Check the actual line voltage to the unit to make sure it is the same as specified in the
compressor nameplate and TDS also phase voltage unbalance does not exceed 2%.
Verify that adequate power supply and capacity is available to meet the required load.
Following is example to calculate phase unbalance tolerance.
% Voltage Imbalance = 100 X max. voltage deviation from average voltage
Average voltage
The maximum voltage deviation is the largest difference between a voltage measurement
across two legs and the average across all three legs. Example:
a) Supply Voltage is 415 V, 3 Ph, 50 Hz Voltage across RY = 410V Voltage across YB =
419V Voltage across BR = 405V Average = 411.33V
b) Maximum deviation from average voltage: RY = 1.33V; YB = 7.67V; BR = 6.33V
Hence, maximum deviation is 7.67V
% Voltage Imbalance = 100 X 7.67 = 1.86 %
411.33
NOTE: DO NOT ATTEMPT TO START THE CHILLER UNTIL THE
FOLLOWING CHECKS HAVE BEEN COMPLETED.