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Enhanced EXV Control
ArcticCool Chiller has 2 options for controlling the EXV(s):
1. Disabled – Indicates that the EXV is controlled
externally without any visibility at the HMI.
Table 11. EXV control options
As demonstrated below, all special and optional function control screens are
almost identical.
ARTC-SVX007A-EN
Screen
2. ArcticCool – ArcticCool T3C Companion Controller.
Preferred control option. See below.
The following table displays the varied EXV control screens
with their options and limitations.
Controls
Common Controls:
•
Setpoint. Process Value and Control value particular to the signal
measured.
•
Auto/Manual control.
•
Trend with Y-axis zoom.
ArcticCool EXV Control.
•
This option requires ArcticCool T3C Companion Controller. The T3C
Companion works with the ArcticCool Main Controller; they share
information including Inputs and Outputs. The Companion cannot work as
a stand-alone controller because it does not have the inputs and outputs
to sustain the functionalities built in. It is designed as a companion relying
on the Main Controller.
•
5 control modes:
–
Liquid Level High Pressure side –requires Level sensor on the
condenser.
–
Liquid Level Low Pressure side –requires level sensor on the
Evaporator.
–
Suction Superheat.
–
Discharge Superheat.
–
Sub-Cooling – Requires liquid line temperature sensor.
•
Setpoint adjusts automatically based on chiller capacity.
•
Capable of controlling up to 4 refrigeration circuits.
•
Access: Main Menu > Devices Menu > EXV button.
Operating Procedures
35
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