AC-SVX002C-EN
77
Table 31.
Main process diagnostics (continued)
Diagnostic
Name
Affects
Target
Severity
Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level
Evaporator
Pump 2 Starts/
Hours Modified
Chiller
Warning
NonLatch
All
A counter for evaporator pump 2 starts or hours has
been manually modified. This diagnostic is
immediately and automatically cleared and thus can
only be seen in the historic diagnostic list.
NA
Evaporator
Water Flow
Lost
Chiller
Immediate and
Special Action
NonLatch
All
After the pump request was activated, water flow
was established and then lost. Special action is to
keep the evap pump request active in a diagnostic
override mode. See Evaporator Water Flow
Protection for more details.
Remote
Evaporator
Water Flow
Lost Lockout
Chiller
Immediate
Latch
All
Four (4) water flow loss events occurred in a moving
4 day time window. Corrective action is needed to
identify and eliminate the cause. See Evaporator
Water Flow Protection for more details.
Local
Evaporator
Water Flow Too
Low
Chiller
Immediate
Latch
Cooling Mode
[Not Cooling
Mode]
Refrigerant side to water side heat balance indicates
that water flow has dropped below allowable
manufacturer limits. See Evaporator Water Flow
Estimation for more details.
Local
Evaporator
Water Flow
Overdue
Chiller
Immediate and
Special Action
NonLatch
All
After the pump request was activated, the
evaporator water flow overdue wait time elapsed
before water flow was established. Special action is
to keep the evap pump request active in a diagnostic
override mode. See Evaporator Water Flow
Protection for more details.
Remote
Evaporator
Water Flow
Lost – Pump 1
Chiller
Warning and
Special Action
NonLatch
All
For dual evaporator pump configurations only.
Evaporator Water Flow Lost diagnostic occurred
while Pump 1 was the selected pump. Specific details
of special action are described in Evaporator_Water_
Pump_Control.
Remote
Evaporator
Water Flow
Lost – Pump 2
Chiller
Warning and
Special Action
NonLatch
All
For dual evaporator pump configurations only.
Evaporator Water Flow Lost diagnostic occurred
while Pump 2 was the selected pump. Specific details
of special action are described in Evaporator_Water_
Pump_Control.
Remote
Evaporator
Water Flow
Overdue –
Pump 1
Chiller
Warning and
Special Action
NonLatch
All
For dual evaporator pump configurations only.
Evaporator Water Flow Overdue diagnostic occurred
while Pump 1 was the selected pump. Specific details
of special action are described in Evaporator_Water_
Pump_Control.
Remote
Evaporator
Water Flow
Overdue –
Pump 2
Chiller
Warning and
Special Action
NonLatch
All
For dual evaporator pump configurations only.
Evaporator Water Flow Overdue diagnostic occurred
while Pump 2 was the selected pump. Specific details
of special action are described in Evaporator_Water_
Pump_Control.
Remote
Evaporator
Pump 1 Fault
Chiller
Immediate or
Warning and
Special Action
NonLatch
All
For systems with no evaporator pump, a single
evaporator pump, or a single inverter driving dual
evaporator pumps, an immediate shutdown shall be
performed. For multiple pump systems, detection of
a pump fault will generally cause pump control to
switch to the redundant pump. For single inverter,
dual pump configuration, switching to the redundant
pump can only happen after the fault is cleared.
Specific details of special action are described in
Evaporator_Water_Pump_Control.
Remote