McQuay WSC Operating Manual page 19

Table 10, UNIT STATUS Combinations
Note: Shutdown is the state of shutting down; vane close, postlube, etc.
• COMPRESSOR STATUS is MODE followed by STATE followed by the SOURCE that is the
device or signal that created the STATE. The possible combinations are in the following table
Table 11, COMPRESSOR STATUS Possibilities
OFF Manual Switch
OFF Compressor Alarm
OFF Unit State
OFF Evap Flow/Re-circulate
OFF Low Oil Sump Temp
OFF Start to Start Timer=xxx
OFF Stop to Start Timer=xxx
OFF Staging (Next ON)
OFF Awaiting Load
PRELUBE Vanes Open
PRELUBE Timer=xxx
PRELUBE Condenser Flow
RUN Unload Vanes-Max Amps
RUN Hold Vanes-Max Amps
RUN Manual Vanes & Speed
RUN Load Vanes-Manual Speed
RUN Hold Vanes-Manual Speed
RUN Unload Vanes-Manual Speed
RUN Load Speed-Manual Vanes
RUN Hold Speed-Manual Vanes
RUN Unload Speed-Manual Vanes
RUN Unload Vanes-Lag Start
RUN Hold Vanes-Evap Press
RUN Unload Vanes-Evap Press
RUN Unload Vanes-Soft Load
RUN Hold Vanes-Soft Load
RUN Load Vanes-Disch Temp
RUN Hold Vanes-Pull-down Rate
RUN Unload Vanes-Demand Limit
RUN Hold Vanes-Min Amps
RUN Load Vanes
RUN Hold Vanes
RUN Unload Vanes
SHUTDOWN Unload
POSTLUBE Timer=xxx
POSTLUBE Motor Current High
NOTES:
1.
Timer countdown values will be shown where "(xxx)" is shown below.
2. For a VFD equipped compressor, "Vanes" or "Speed" is shown in the RUN state to indicate if the capacity is
controlled by speed from the VFD or by vane control.
3.
When the compressor is in the START state (oil pump started but still waiting for oil pressure), "PRELUBE –
Vanes Open" or "PRELUBE – Timer=(xxx)" is shown as appropriate.
OM Centrif Micro ΙΙ-5
MODE
COOL
ICE SHUTDOWN (Note 1)
HEAT
TEST
Complete STATUS Text
(in priority sequence)
STATE
OFF Manual Switch
Remote Switch
AUTO
BAS Network
Reason for the compressor being off.
Current state of the Prelube sequence
Overrides water temperature command
Used for service purposes. "T" password required. Operated from
compressor controller
Overrides water temperature command
Unloading during the shutdown sequence
Compressor motor running during the shutdown mode. It should be off.
SOURCE
Local
Notes
Normal operation
Postlube timer on
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