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29CG-SVU02B-E4
Table 6 - Communication Diagnostics
Notes:
1. 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.
2. 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).
Diagnostic Name Effects Severity Persistence Active
Modes
[Inactive
Modes]
Criteria Reset
Level
Excessive Loss of Comm Chiller Immediate Latch All Loss of comm with 20% or more of the llids configured for the
system has been detected. This diagnostic will suppress the
callout of all subsequent comm loss diagnostics. Check power
supply(s) and power disconnects - troubleshoot LLIDS buss
using TechView
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 35-40 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 35-40 second period.
Remote
Comm Loss:
Ext Ice Building Ctrl Input
Chiller Warning Latch All Continual loss of communication between the MP and the
Functional ID has occurred for a 35-40 second period. Chiller
shall revert to normal (non-ice building) mode regardless of last
state.
Remote
Comm Loss:
Outdoor Air Temperature
Chiller Warning Latch All Continual loss of communication between the MP and the
Functional ID has occurred for a 35-40 second period. If
configured as an air-cooled this diagnostic shall turn on all fans
and use a minimum LPC ignore time of 30 seconds.
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 35-40 second period.
Remote
Comm Loss:
Evap Entering Water Temp
Chiller Normal Latch All Continual loss of communication between the MP and the
Functional ID has occurred for a 35-40 second period.
Remote
Comm Loss:
Condenser Leaving Water
Tem p
Chiller Warning Latch All Continual loss of communication between the MP and the
Functional ID has occurred for a 35-40 second period.
Remote
Comm Loss:
Condenser Entering Water
Tem p
Chiller Warning Latch All Continual loss of communication between the MP and the
Functional ID has occurred for a 35-40 second period.
Remote
Comm Loss:
Discharge Pressure
Transducer
Circuit Normal Latch All Continual loss of communication between the MP and the
Functional ID has occurred for a 35-40 second period.
Remote