ClimaCool IOM AR2 SERIES - Manual (Page 63)

61
www.climacoolcorp.com
®
Sequence of Operation
SEQUENCE OF OPERATION
GENERIC INTERFACE - MANUAL ISOLATION
VALVES
Sequence of Operations
Chiller shall be enabled locally or remotely from enable/ disable
contact by BAS via selector switch on face of the “Master Control
Panel” . Pumps for chilled water supply and condenser water supply
shall be started by others . When proof of flow is established in both
the chilled water and condenser water lines, the ClimaCool chiller
shall start . The “Chilled Water Supply” (CHWS) temp . sensor (TS1),
located in the discharge line of respective chiller shall be used to
cycle compressor stages sequentially to maintain setpoint of 45°F
(adjustable from the LCD Display on the Face of the “Master Control
Panel”, or Remotely via either 0-10 VDC or 4-20 ma signal, as
selected . .)
Chillers will be disabled until “Chilled Water Return” (CHWR)
temperature sensor is below 90°F and when the water entering
temperature is above 60°F .
Each module of the chiller has 2 compressors . Stage 1 compressors
shall be started first on lead week and stage 2 compressors shall be
started first on lag weeks to equalize run hours between compressors
1 and 2 of the modules automatically . Compressors shall be staged
with a single compressor per module as required, until all available
modules of the chiller have one compressor running . The remaining
compressors will stage per module, as load requires . Compressors
shall be energized and de-energized by the program, in an order
which will maintain equal run time .
The compressor with most run time will de-energize as the setpoint
is satisfied, and compressor with least run time will energize, as
additional cooling capacity is required .
If a fault is detected the compressor will be disabled and displayed on
the “Master Control Panel” LCD Screen . (Faults must be manually
reset at the chiller) .
The Chiller Status and Run Time in hours for each Compressor
shall be shown on the LCD Display on the “Master Control Panel” .
Common Alarm contact and Chiller Status contact is provided at the
panel .