Diagnostics
82 RTHD-SVX01K-EN
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 27. Communication diagnostics
Diagnostic Name Affects Severity Persistence
Active
Modes
[Inactive
Modes] Criteria
Reset
Level
Comm Loss: Adaptive
Frequency Drive
Chiller Immediate NonLatching All
Continual loss of communication between the MP and
the Functional ID has occurred for a 35-40 second
period. Flow calculation shall be disabled.
Remote
Comm Loss: AFD Output
Power Input
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: AFD Speed
Signal Output
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: Compressor %
RLA Output
Chiller Warning Latch All
Continual loss of communication between the MP and
the Functional ID has occurred for a 30 second
period.
Remote
Comm Loss: Cond Diff
Water Pressure
Chiller Warning Latching All
Continual loss of communication between the MP and
the Functional ID has occurred for a 35-40 second
period. Flow calculation shall be disabled.
Remote
Comm Loss: Cond Head
Press Cntrl Output
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: Cond Rfgt
Pressure Output
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: 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: 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
Rfgt Pressure
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: Condenser
Water Flow Switch
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: Condenser
Water Pump Relay
Chiller Warning Latch All
Continual loss of communication between the MP and
the Functional ID has occurred for a 30 second
period.
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: Economizer
Bypass Valve
Chiller Normal Latch All
Continual loss of communication between the MP and
the Functional ID has occurred for a 30 second period
Remote
Co
mm Loss: Economizer
Pressure
Chiller Normal Latch All
Continual loss of communication between the MP and
the Functional ID has occurred for a 30 second
period.
Remote
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