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a. Primary 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.
b. Primary Online (Applies to secondary PLC only).
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
heat pump.
Local Temp Cntrl
Applies only if module is running in Stand-alone Mode.
Displays Load inlet and outlet temperatures and an
opening status of Load Isolation Valves as well as Ambient
Temperature.
Temp Heat/Cool
Local module hot or chilled water temperature control
sensor.
Temp SP Heat/Cool
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.
•
Temp Diff +. Temperature control differential above
setpoint or positive dead band (DB).
•
Temp Diff -. Temperature control differential below
setpoint or negative DB.
•
Both of them define the temperature control DB.
•
Temp Stage-Up Delay. When next compressor has
been staged up, this delay has to elapse before next
compressor is allowed to stage up.
•
Temp Stage-Down Delay. When next compressor has
been staged down, this delay has to elapse before next
compressor is allowed to stage down.
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.
Liq Line Solenoid
Status of the solenoid valve installed on the liquid line pipe.
ARTC-SVX006A-EN
EX Valve
Indicates the position of electronic expansion valve, if
installed.
Rvrs Valve
Reversing Valve position. Cool – module / circuit running in
cooling mode or defrost cycle or compressor is off (default
Reversing Valve position); Heat – module / circuit running
in heating mode.
LLB Valve
Liquid Line Bypass solenoid valve state: OFF / ON.
Comp (X) En/Dis
Compressor enable / disable button.
Comp (X) Status
1. Comp OFF. Compressor is off and can't be turned on.
2. Ready. Compressor is off but can be turned on.
3. N/A
4. OFF by Evap Flow. Compressor has been called to run
but waiting for Load Flow proof.
5. OFF by Min Off. Compressor is cycling through safety
Minimum Off Time.
6. OFF by Switch. Compressor is off by En/Dis Switch.
7. OFF by Alarm. Compressor is off by Alarm.
8. Running. Compressor is running.
9. ON by Min On. Compressor has been called off
although it keeps running due to safety Minimum On
Time.
10. ON by Pumpdown. Compressor has been called off but
keeps running due to Pump-down sequence.
11. Start Delayed. Compressor startup is delayed by EVX
opening or staging delay.
12. OFF by Restriction. Module capacity limited by low
Load Leaving Water Temperature.
13. N/A
14. OFF by Src Appch. Compressor is off by high Source
Approach.
15. N/A
16. OFF by Min DP. Compressor is off as it can not build up
Minimum Differential Pressure to operate Reversing
Valve in a timely fashion.
Fan Bank (X)
Two controls components can be displayed.
LEDs. Green - corresponding fan in the fan bank is
commanded on; Grey - corresponding fan is commanded
off.
Module I/O Screens
Operating Procedures
31
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