176 CG-SVX17D-EN
Diagnostics
Communication Diagnostics
Note: 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).
Outdoor Air Temp Sensor
Outdoor Air Temp Sensor
Outdoor Air Temp Sensor
Chiller Normal Latch All Bad Sensor or LLID. Remote
Discharge Pressure Transducer
Discharge Pressure Transducer
Discharge Pressure Xdcr
Circuit Immediate Latch All Bad Sensor or LLID Remote
Suction Pressure Transducer
Suction Pressure Transducer
Suction Pressure Xdcr
Circuit Immediate Latch All Bad Sensor or LLID Remote
Suction Temperature Sensor
Suction Temperature Sensor
Suction Temperature Sensor
Circuit Immediate Latch All Bad Sensor or LLID Remote
Discharge Temperature Sensor
Discharge Temperature Sensor
Discharge Temperature Sensor
Circuit Immediate Latch All Bad Sensor or LLID Remote
Heat Recovery Entering Water Temp Sensor
Heat Recovery Entering Water Temp Sensor
HR Entering Wtr Temp Sensor
Chiller Warning Latch All Bad Sensor or LLID Remote
Heat Recovery Leaving Water Temp Sensor
Heat Recovery Leaving Water Temp Sensor
HR Leaving Wtr Temp Sensor
Chiller Warning Latch All Bad Sensor or LLID Remote
Diagnostic Name Affects Severity Persistence
Active Modes
[Inactive
Modes] Criteria
Reset
Level
Excessive Loss of Comm
Excessive Loss of Comm
Excessive Loss of Comm
Chiller Immediate Latch All
Loss of comm with 10 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 LLID bus using TechView.
Remote
Comm Loss: External Auto/Stop
Comm Loss: External Auto/Stop
Comm: 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
Comm Loss: Emergency Stop
Comm: 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
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