Operating Procedures
38 ARTC-SVX005A-EN
Compressor Overview Screens
Use the left and right scrolling buttons to scroll through the
overview screens.
The overview menu is comprised of two screens:
Overview 1 and Overview 2. These two screens are
different for the master and slave modules.
Compressor 1 and Compressor 2
Each module is equipped with tandem compressors. The
module overview screen reports conditions in each
compressor individually:
Compressor En/Dis
Pressing this button enables or disables a compressor. It is
used for testing and maintenance purposes.
Comp Status
• Compressor Off - The compressor is off and can’t be
turned on.
• Ready - Compressor is off but can be turned on.
• OFF by Source Flow - The compressor is waiting for
the Source Flow.
• OFF by Cond Flow - The compressor is waiting for
Condenser Flow.
• OFF by Evap Flow - The compressor is waiting for the
Evaporator Flow.
• OFF by Min Off - The compressor is cycling through
safety Minimum Off Time.
• OFF by Switch - The compressor is off by HMI En
button.
• OFF by Alarm - The compressor is off by alarm.
• Running - The compressor is running.
• ON by Min On - The compressor is running and
cycling through safety Minimum On Time.
• Start Delayed - First Compressor - waiting for EXV to
open to preset position (70% by default); Second
Compressor - cycling through Compressor Staging
Delay.
• OFF by SST - The second compressor is off by too low
Saturated Suction Temperature.
• OFF by SDT - The second compressor is off by too
high Saturated Discharge Temperature.
Communication
This LED indicates if PLC is communicating to compressor
control device either protection module or VSD (Variable
Speed Drive).
Local Temp Cntrl
This indicator applies only if module is running in stand-
alone mode:
• Cntrl Temp Hot / Cold - This is the local module’s hot
or chilled water temperature control sensors.
• Temp SP Hot / Cold - This is the local module’s
heating and cooling temperature control set points.
This can only be adjusted by ‘tech’ or ‘admin’ access
levels.
Discharge 3 (D3) Open Open Closed
Discharge 4 (D4) Closed Closed Open
Table 6. D1/D2 and S1/S2 values (continued)
Value Simultaneously Mode Cooling only Mode Heating only Mode
Table 7. The overview screens 2
Master Overview 2 Screen
Slave Overview 2Screen
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