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Operating Procedures
Chiller Setpoint Control
Multiple chiller setpoint control modes are available. These
are:
•
User Setpoint
•
Digital Offset
•
Remote Setpoint
•
Remote Offset
The chiller ultimately works with one value for setpoint, this
value is always displayed on the Main screen in the
Evaporator section, labeled SET POINT:
Figure 13. Main screen
User Setpoint
To Access the Chiller Setpoint control screen, select the
setpoint indicator from the Main screen or the Chiller
Control screen. See the following figure.
Figure 14. Chiller setpoint control
To change the setpoint:
1. Touch User Setpoint.
2. Enter a new value in the keyboard that appears.
36
In user setpoint mode, Actual Setpoint equals to User
Setpoint.
Digital Offset
This feature requires a parameter and a digital input. The
parameter, Digital Offset is exposed to the HMI on the
Chiller Control Setpoint screen:
The chiller control setpoint screen allows you to enter a
value (0 to 10) in °C or °F depending on the HMI
configuration. Digital Input #4 enables the digital offset
functionality. When this input is on, the digital offset display
turns blue and the accompanying pilot lights up.
Remote Setpoint
When enabled it ignores the user setpoint and reads
analog input #1. This function requires:
•
Inputs:
–
Remote Setpoint – Analog Input #1 – range: 0-100°
C or 32-212°F.
–
Remote Setpoint Enable – Digital Input #3.
•
Parameter:
–
Remote Set Enable – set to Absolute.
Figure 15. Chiller setpoint control - Remote setpoint
ARTC-SVX013A-EN
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