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Operating Procedures
Primary Status
Applies to primary PLC only. Possible options:
•
Primary ON - All primary modules conditions are
satisfied by module.
•
Waiting - All primary modules conditions are satisfied
and module is counting down a delay before acquiring
primary ON status.
•
OFF by Sensor - System cooling or heating
temperature sensor failed.
•
OFF by no secondary - Primary PLC communicates
with no secondary modules.
Note: Master Status states 3 or 4 will cause all the modules
to run in Stand-alone mode. These failing conditions
are false at normal primary/secondary operation.
Primary Online
Applies to secondary PLC only. Possible options:
•
LED is green - secondary PLC is communicating with
primary PLC.
•
LED is gray - secondary PLC is not communicating with
primary PLC.
Lead Module
Indicates which module is currently a lead module in the
bank.
Evap/Cond Circuits
Displays Evaporator inlet and outlet temperatures and an
opening status of Evaporator Isolation Valves as well as
Ambient Temperature.
Local Temp Cntrl
Applies only if module is running in stand-alone mode.
•
Temp Cool/Heat - Local module hot or chilled water
temperature control sensor.
•
Temp SP Cool/Heat - Local module heating or cooling
temperature control setpoint. Can be adjusted by tech
user only.
•
Cool/Heat Comps Demand - Cooling or Heating
Demand value in number of requested compressors.
Temp Cntrl Settings
Viewable/adjustable for 'tech' user only.
•
Cool Temp Diff +/- – Temperature control differential
above/below setpoint or positive/negative dead band
(DB) in Cooling Mode.
•
Heat Temp Diff +/- – Temperature control differential
below/above setpoint or positive/negative dead band
(DB) in Heating Mode.
Note: Both of them define the temperature control DB.
•
Cool St Up/Dwn Dly – When next compressor has been
staged up/down, this delay has to elapse before next
compressor is allowed to stage up/down in Cooling
Mode.
40
•
Heat St Up/Dwn Dly – When next compressor has been
staged up/down, this delay has to elapse before next
compressor is allowed to stage up/down in Heating
Mode.
On/Off Button
Used to turn secondary PLC module on/off in Stand-alone
Mode. For primary PLC module, On/Off Button on the
Home Screen serves the same purpose.
Overview Circuits
Refrigerant temperatures/pressures are displayed: suction
pressure; discharge pressure; suction temperature; suction
super heat temperature.
Suct/Disch Pres and Suct/SH Temp
Refrigerant temperatures and pressures are displayed:
suction pressure, discharge pressure, suction temperature,
and suction super heat temperature.
Liq Line Solenoid
Status of the solenoid valve installed on the liquid line pipe.
EX Valve
Indicates the position of electronic expansion valve, if
installed.
Comp (X) En/Dis
Compressor enable/disable button.
Evac Cycle (MWC)
Enable/disable evacuation cycle for the circuit – Available
for 'tech' user only.
Comp (X) Status
•
Comp OFF - Compressor is off and cannott be turned
on.
•
Ready - Compressor is off but can be turned on.
•
OFF by Cond/Source Flow - Compressor has been
called to run but waiting for Condenser Flow proof
•
OFF by Evap/Load Flow - Compressor has been called
to run but waiting for Evaporator Flow proof.
•
OFF by Min Off - Compressor is cycling through safety
Minimum Off Time.
•
OFF by Switch - Compressor is off by En/Dis Switch.
•
OFF by Alarm - Compressor is off by Alarm.
•
Running - Compressor is running.
•
ON by Min On - Compressor has been called off
although it keeps running due to safety Minimum On
Time.
•
Start Delayed - Waiting for EXV positioning (if
applicable) or going through second compressor start-
up delay.
•
Capacity Restricted - Module capacity restricted to a
single running compressor only due to Low Chilled
Leaving Water Temperature.
ARTC-SVX010A-EN
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