AC-SVX001A-EN
101
Table 28. Diagnostics — communication (continued)
Diagnostic
Name
Affects
Target
Severity
Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level
Comm Loss:
Drive Cooling
Sply Temp Ckt2
Circuit Norma Latch All
Continual loss of communication between the MP and
the Functional ID has occurred for a 30 second
period. While this diagnostic is active, the associated
Drive Cooling ByPass Valve shall be commanded fully
closed
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:
Evap Rfgt Pool
Temp Ckt1
Circuit and
Chiller
Special Action
and Info
Latch All
Continual loss of communication between the MP and
the Functional ID has occurred for a 30 second period
Note: The Evap Pool Temp Sensors are used for both
On and Off -cycle freeze protection. Substitute
Suction Pressure to Temperature conversion for
freeze protection functions
Remote
Comm Loss:
Evap Rfgt Pool
Temp Ckt2
Circuit and
Chiller
Special Action
and Info
Latch All
Continual loss of communication between the MP and
the Functional ID has occurred for a 30 second period
Note: The Evap Pool Temp Sensors are used for both
On and Off -cycle freeze protection. Substitute
Suction Pressure to Temperature conversion for
freeze protection functions
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
Rfgt Liquid
Level Ckt1
Circuit 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
Rfgt Liquid
Level Ckt2
Circuit 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
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:
Expansion
Valve Ckt1
Circuit Normal Latch All
Continual loss of communication between the MP and
the Functional ID has occurred for a 30 second period
Remote
Comm Loss:
Expansion
Valve Ckt2
Circuit 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
Command
None Info Latch All
Continual loss of communication between the MP and
the Functional ID has occurred for a 30 second period
Remote
DDiiaaggnnoossttiiccss
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