Diagnostics
162 RTAC-SVX01J-EN
Communication Diagnostics
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).
Very Low Evaporator
Refrigerant Pressure
- Circuit 2
Chiller Immediate Latch
All
[compressor or
circuit in manual
lockout]
The evaporator pressure dropped below 8 psia (or 5 psia in sftw
prior to Oct '02) regardless of whether or not compressors are
running on that circuit. This diagnostic was created to prevent
compressor failures due to crossbinding by forcing an entire
chiller shutdown. If a given compressor or circuit is locked out,
the suction pressure transducer(s) associated with it, will be
excluded from causing this diagnostic.
Local
Table 67. Main processor diagnostics (continued)
Diagnostic Name
Affects
Target Severity
Persist-
ence
Active Modes
[Inactive
Modes] Criteria
Reset
Level
Table 68. Communication diagnostics
Diagnostic Name
Affects
Target Severity
Persist-
ence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level
Comm Loss: Chilled
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: Cond Rfgt
Pressure, Circuit #1
Circuit 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, Circuit #2
Circuit Immediate Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period.
Remote
Comm Loss: Electronic
Expansion Valve, Circuit
#1
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: Electronic
Expansion Valve, Circuit
#2
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: 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 Oil
Return Valve, Cprsr 1A
Cprsr 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 Oil
Return Valve, Cprsr 1B
Cprsr 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 Oil
Return Valve, Cprsr 2A
Cprsr 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 Oil
Return Valve, Cprsr 2B
Cprsr 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
Entering Water
Temperature
Chilled
Water
Reset
Special
Mode
Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period. Chiller shall
remove any Return or Constant Return Chilled Water Reset, if it
was in effect. Apply slew rates per Chilled Water Reset spec.
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 Drain Valve - Ckt 1
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 Drain Valve - Ckt 2
Circuit 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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