74
AC-SVX002C-EN
Table 31.
Main process diagnostics (continued)
Diagnostic
Name
Affects
Target
Severity
Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level
BAS
Communica-
tion Lost
Chiller
Special
NonLatch
All
The BAS was setup as "installed" at the MP and the
Lontalk LCIC lost communications with the BAS for
15 contiguous minutes after it had been established.
Refer to Section on Setpoint Arbitration to determine
how setpoints and operating modes may be affected
by the comm loss. The chiller follows the value of the
Tracer Default Run Command which can be
previously written by Tracer and stored nonvolatile
by the MP (either use local or shutdown). Note that
this diagnostic is never operational for BacNet
Communication interface (BCIC) and only
operational with a LonTalk Communication interface
(LCIC) if so configured by the BAS or Tracer system.
Remote
LCI-C Software
Mismatch: Use
BAS Tool
Chiller
Warning
NonLatch
All
The neuron software in the LCI-C module does not
match the chiller type. Download the proper software
into the LCI-C neuron. To do this, use the Rover
service tool, or a LonTalk® tool capable of
downloading software to a Neuron 3150®.
Remote
External
Chilled/Hot
Water Setpoint
Chiller
Warning
NonLatch
All
a. Function Not “Enabled”: no diagnostics. b.
“Enabled “: Out-Of-Range Low or Hi or bad LLID, set
diagnostic, default CWS/HWS to next level of priority
(e.g. Front Panel SetPoint). This Warning diagnostic
will automatically reset if the input returns to the
normal range.
Remote
External
Demand Limit
Setpoint
Chiller
Warning
NonLatch
All
a. Function Not “Enabled”: no diagnostics. B.
“Enabled “: Out-Of-Range Low or Hi or bad LLID, set
diagnostic, default DLS to next level of priority (e.g.
Front Panel SetPoint). This Warning diagnostic will
automatically reset if the input returns to the normal
range.
Remote
Pumpdown
Terminated By
Time
Circuit
Warning
Latching
Operational/
Service
Pumpdown [All
Except
Operational
and Service
Pumpdown]
Operational Pumpdown or Service Pumpdown
procedure did not terminate normally by reaching
the termination pressure within the allotted time.
Remote
Inverted
Evaporator
Water
Temperature
Chiller
Warning/
Normal
NonLatch/
Latch
Any Ckt(s)
Energized [No
Ckt(s)
Energized]
Not Enabled (Default): diagnostic is Non-Latching
and Warning. Enabled: diagnostic is Latching and
Normal Shutdown. The entering evaporator water
temp fell below the leaving evaporator water
temperature by more than 3°F for 100°F-sec while at
least one compressor was running. Diagnostic will
auto clear if the leaving water temp – entering water
temp < 3F. It can warn of improper flow direction
through the evaporator, misbound water
temperature sensors, improper sensor installation,
partially failed sensors, or other system problems.
Note that either entering or leaving water temp
sensor or the water system could be at fault.
Remote
