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AC-SVX003A-EN
Table 32. Diagnostics — communication (continued)
Diagnostic
Name
Affects Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
Comm Loss:
Electronic
Expansion Valve
2
Circuit Normal Latch All
Continual loss of communication between the MP and the
EXV Step Status has occurred for a 30 second period, OR
EXV Steps Maximum Position has not been received. If
EXV Steps Maximum Position has not been received, MP
will periodically request EXV Steps Maximum Position,
since it is only transmitted upon request.
Remote
Comm Loss:
Emergency Stop
Feedback Input
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:
Energy Meter X
Chiller
Warning
Latch All
Continual loss of communication between the MP and the
Power Meter has occurred for a 30 second period.
Remote
Comm Loss:
Evaporator
Entering Water
Temperature
Chiller Normal Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period. Note:
Entering Water Temp Sensor is used in EXV pressure
control as well as ice making & CHW reset, so it must cause
a unit shutdown even if Ice or CHW reset is not installed.
Remote
Comm Loss:
Evaporator
Leaving Water
Temperature
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:
Evaporator
Refrigerant Pool
Temperature
Circuit
Warning/
Special Action
Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period.
Invalidate evaporator pool temperature sensor
measurement if this diagnostic is active. If evaporator
isolation valves are installed, revert to Evaporator Shell
Refrigerant Saturated Temperature for freeze protection
functions. If evaporator isolation valves are not installed,
revert to Evaporator Saturated Temperature for freeze
protection functions.
Remote
Comm Loss:
Evaporator
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:
Evaporator
Water Pump
Relay
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: Ext
Noise Reduction
Request
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:
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:
External Chilled
Water Setpoint
Chiller
Warning/
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
Comm Loss:
External Ckt
Lockout
Circuit
Warning/
Special Action
Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period. MP will
nonvolatile hold the lockout state (enabled or disabled) that
was in effect at the time of comm loss.
Remote
Comm Loss:
External Demand
Limit Setpoint
Chiller
Warning/
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 Demand limit setpoint
and revert to the next higher priority for Demand Limit
setpoint arbitration.
Remote
Diagnostics
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