RTHD-SVX01L-EN
81
Communication Diagnostics
Notes:
• The following communication loss diagnostics
will not occur unless that input or output is
required to be present by the particular
configuration and installed options for the chiller.
• Communication diagnostics (with the exception
of “Excessive Loss of Comm” are named by the
Functional Name of the input or output that is
no longer being heard from by the Main
Processor. Many LLIDs, such as the Quad
Relay LLID, have more than one functional
output associated with it. A comm loss with
such a multiple function board, will generate
multiple diagnostics. Refer to the Chiller's
wiring diagrams to relate the occurrence of
multiple communication diagnostics back to the
physical LLID boards that they have been
assigned to (bound).
Table 24. Communication diagnostics
Diagnostic Name
Affects
Severity
Persistence
Active Modes
[Inactive Modes]
Criteria
Reset
Level
Comm Loss: Slide
Valve Unload
Chiller Normal Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period.
Remote
Comm Loss: Slide
Valve Load
Chiller Normal Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period.
Remote
Comm Loss:
External Auto/Stop
Chiller Normal Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period.
Remote
Comm Loss:
Emergency Stop
Chiller Normal Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period.
Remote
Comm Loss:
External Ice Building
Command
Ice
Building
Normal Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period. Chiller
shall revert to normal (non-ice building) mode regardless of
last state.
Remote
Comm Loss: Ice
Building Status
Relay
Ice
Building
Normal Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period. Chiller
shall revert to normal (non-ice building) mode regardless of
last state.
Remote
Comm Loss:
Outdoor Air
Temperature
Chiller
Warning
and Special
Action
Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period. Note
that if this diagnostic occurs, Chiller shall remove any OA
Chilled Water Reset, if it was in effect and if Tracer OA was
unavailable. Apply slew rates per Chilled Water Reset spec
Remote
Comm Loss: Evap
Leaving Water Temp
Chiller Normal Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period.
Remote
Comm Loss: Evap
Entering Water
Temp
Chiller
Warning
and Special
Action
Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period. Chiller
shall remove any Return or Constant Return Chilled Water
Reset, if it was in effect. Apply slew rates per Chilled Water
Reset spec.
Remote
Comm Loss:
Condenser Leaving
Water Temp
Chiller Info Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period.
Remote
Comm Loss:
Condenser Entering
Water Temp
Chiller
Warning
and Special
Action
Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period. If chiller
running, and condenser water regulating valve option
installed, force valve to 100% flow.
Remote
Comm Loss: Cprsr
Discharge Rfgt
Temp
Chiller Immediate Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period.
Remote
Comm Loss: Ext
Chilled/Hot Water
Setpoint
Chiller
Warning
and Special
Action
Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period. Chiller
shall discontinue use of the External Chilled Water Setpoint
source and revert to the next higher priority for setpoint
arbitration
Remote
Diagnostics
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