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Operating Procedures
Table 14. Fan state map (continued)
Fan State Definition
4
5
Compressor Staging Valve Control
All compressors Staging Valves controls can be accessed
from compressors screen Main Menu →Comp button →
Staging button. Controls are available for Tech level HMI
users and above.
Each Staging Valve controls consist of 2 components:
1. Mode selector
2. Valve status light
Figure 34. Staging valves control screen
Table 15. Chiller control system Optional Functionalities list
Function
Brief
Free Cooling with
Module can operate with extremely low head pressure to provide near free cooling.
ArcticBoost
Pump and Plant controls
Monitor and Control evaporator and condenser pumps functions
Data Logging
Displays chillers / compressors key data logged to CSV files
Primary/Secondary
Monitor and Control multiple chillers Primary/Secondary functions
Monitor and Control compressors economizers functions
Economizer
Hot Gas Bypass Valve
Monitor and Control compressors Hot Gas Bypass functions
Free Cooling
ArcticBoost (Low Lift Refrigerant Pump)
ArcticBoost provides free cooling without additional coils or
external coolers. The ArcticBoost function allows
compressors to operate at very low pressure ratios by
providing a refrigerant pump to aid in motor cooling.
As condensing temperature reduce and become close to
chiller side temperatures, pressure ratio (PR) reduces.
When the PR drops below the Enable threshold (User-
Settable – default is 1.3), the ArcticBoost function is
Enabled and stays enabled until the PR rises above the
Disable threshold (Enable Threshold plus 0.3).
48
Start
Cooling
As per control options, each Staging Valve can be in one of
the modes:
1. Off – staging valve is always off regardless of other
conditions.
2. On – staging valve is forced on. Used mostly for
troubleshooting or maintenance purposes.
3. Auto – staging valve is controlled automatically as
compressor cycles through its states.
Optional Functionalities
The following table lists the Optional Functionalities of this
control system:
While ArcticBoost function is Enabled, the control monitors
both the Inverter and Cavity temperatures of the
compressors. If either temp rises above the cooling
required threshold (Default based on compressor solenoid
valves but user-settable is 113.0°F), pump is enabled.
When both temperatures drop below cooling no longer
required threshold (Default, Settable – 108.0°F), pump is
turned off and remains off for the Anti-Cycle period
(Default, Settable – 30 seconds).
Access Level
Tech
Tech
Admin
Tech
Tech
Tech
ARTC-SVX007A-EN
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