Manual
61
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®
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 ow 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 rst on lead week and stage 2 compressors shall be
started rst 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 satised, 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