90
AC-SVX001A-EN
Table 27. Diagnostics — main processor (continued)
Diagnostic
Name
Affects
Target
Severity
Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level
Evaporator
Water Flow
Overdue
Chiller Normal NonLatch
Estab. Evap.
Water Flow on
going from
STOP to AUTO
or Evap Pump
Override.
Evaporator water flow was not proven within 20
minutes of the Evaporator water pump relay being
energized in normal “Stop” to “Auto” transition. If the
pump is overridden to “On” for certain diagnostics,
the delay on diagnostic callout shall be only 255
seconds. The pump command status will not be
affected by this diagnostic in either case
Remote
Excessive
Condenser
Pressure –
Ckt1
Circuit Immediate Latch All
The condenser pressure transducer of this circuit has
detected a condensing pressure in excess of the
design high side pressure as limited by the particular
compressor type
Remote
Excessive
Condenser
Pressure –
Ckt2
Circuit Immediate Latch All
The condenser pressure transducer of this circuit has
detected a condensing pressure in excess of the
design high side pressure as limited by the particular
compressor type
Remote
External
Chilled/Hot
Water Setpoint
None Info Latch All
a. Function Not "Enabled": no diagnostics. b.
"Enabled ": Out-Of-Range Low or Hi or bad LLID, set
diagnostic, default CWS to next level of priority (e.g.
Front Panel SetPoint)
Remote
External
Demand Limit
Setpoint
None Info Latch All
a. Not "Enabled": no diagnostics. b. "Enabled ": Out-
Of-Range Low or Hi or bad LLID, set diagnostic,
default CLS to next level of priority (e.g. Front Panel
SetPoint
Remote
Failure to Arm
or Hold - AFD
1A
Circuit Info Nonlatch All
AFD 1A (controlling Compressor 1A) failed to
respond in an appropriate time with its status of
Armed to Hold or Hold within the allotted time of 1
minute of the sent command. (Arm to Hold command
sent; armed to Hold status received; Hold command
sent; Hold status received)
Local
Failure to Arm
or Hold - AFD
2A
Circuit Info Nonlatch All
AFD 2A (controlling Compressor 2A) failed to
respond in an appropriate time with its status of
Armed to Hold or Hold within the allotted time of 1
minute of the sent command. (Arm to Hold command
sent; armed to Hold status received; Hold command
sent; Hold status received)
Local
Failure to Arm
or Start - AFD
1A
Circuit Immediate Latch All
AFD 1A (controlling Compressor 1A) failed to arm or
start within the allotted time of 1 minute. (Arm to
Start command sent; armed to Start status received;
Start command sent; Started status received)
Local
Failure to Arm
or Start - AFD
2A
Circuit Immediate Latch All
AFD 2A (controlling Compressor 2A) failed to arm or
start within the allotted time of 1 minute. (Arm to
Start command sent; armed to Start status received;
Start command sent; Started status received)
Local
High
Differential
Rfgt Pressure -
Ckt1
Circuit Normal Latch
Cprsr
Energized
[Service/Op
Pumpdown]
The differential pressure for the respective circuit
was above 275 Psid (1890 kPa) for 2 consecutive
samples 5 seconds apart
Remote
High
Differential
Rfgt Pressure -
Ckt2
Circuit Normal Latch
Cprsr
Energized
[Service/Op
Pumpdown]
The differential pressure for the respective circuit
was above 275 Psid (1890 kPa) for 2 consecutive
samples 5 seconds apart
Remote
DDiiaaggnnoossttiiccss
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