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•
Temperature Enable Threshold – When either the
inverter or cavity temperature exceeds this value and
the pressure ratio permissive is satisfied, the pump is
started. Confirm this value matches the settings in the
compressor.
•
Temperature Disable Threshold – When both the
inverter and cavity temperature drop below this value
then the pump stops. Confirm this value matches the
settings in the compressor.
•
Anti-Cycle Time – This value keeps the pump from
cycling too often.
Outputs
Pump Command
Refrigerant Pump for Split Systems
The refrigerant pump operates differently in a split system
compared to straight motor cooling mode. In the split
system mode, the pressure ratio is the keep signal - the
pump runs whenever the pressure threshold is met. This
mode also works in conjunction with a bypass valve which
is open when the pump is off and closed when the pump is
on.
Barrel Isolation
The chiller system can also manage multiple fluid circuits.
A four-compressor/ four-circuit air-cooled chiller generally
has two evaporator barrels. To optimize the system, the
controller only opens the barrel where compressors are
running, and the other barrel(s) are closed. This revision of
software can manage four separate fluid circuits.
Barrel isolation valves are controlled at an admin-user level
from the HMI configuration page.
Following options are available.
•
Disabled – No control of isolation from the controller.
•
Compressor – Any compressor that is assigned to a
circuit and is running, opens the isolation valve for that
circuit.
ARTC-SVX013A-EN
•
Cooling EN – All isolation valves are open when chiller
is enabled.
When either Compressor or Cooling EN selected, the
Settings button is available. Click Settings to display the
following.
•
HOA Control – Same as any other HOA control except
only one for the whole system. Manual opens all
isolation valves. In auto, valves operate independently.
•
Circuit Configuration – This will generate an error if
the number of compressors on each circuit is not equal.
•
Valve Close Delay – Keeps valve open for the time
Setting after fluid no longer required.
•
Status of each Valve
Security Configuration
The TCAA Chiller control system has following 3 levels of
security:
•
User:
–
Automatic Logon.
–
View all main pages.
–
Can turn chiller on / off.
–
Can change user chilled water setpoint.
–
No access to Settings and Devices screens.
•
Tech:
–
User is responsible for day-to-day maintenance of
the chiller.
–
Has full access to Devices screens but no access to
Settings screens.
•
Admin:
–
Full Access.
Note: Both Admin and Tech users must log on
using the button on the main screen and
provide their username and password in the
user login screen.
Operating Procedures
63
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