RTHD-SVX01L-EN
77
Table 23. Main processor diagnostics (continued)
Diagnostic Name
Affects
Target
Severity
Persistence
Active Modes
[Inactive Modes]
Criteria
Reset
Level
Evaporator Water
Flow Lost
Chiller Immediate NonLatch
Evap pump
commanded “on”
except for [All Stop
modes]
The Evaporator water flow proof input was open for more
than 6-10 contiguous seconds after flow had been proven.
The pump command status will not be effected. Even
though the pump may be commanded to run in the STOP
modes (pump off delay time), this diagnostic shall not be
called out in the STOP modes. This diagnostic will auto-
clear on proof of flow (6-10 seconds of continuous flow), or
if chiller is returned to Stop mode.
Remote
Evaporator Water
Flow Overdue
Chiller Normal NonLatch
Estab. Evap. Water
Flow on going from
STOP to AUTO.
Evaporator water flow was not proven within 20 minutes of
the Evaporator water pump relay being energized. The
Evap pump command status will not be effected. This
diagnostic will auto-clear on proof of flow (6-10 seconds of
continuous flow), or if chiller is returned to Stop mode.
Remote
External Base
Loading Setpoint
Chiller
Info and
Special
Action
NonLatch All
a. Not "Enabled": no diagnostics. b. "Enabled ": Out-Of-
Range Low or Hi or bad LLID, set diagnostic, default BLS to
next level of priority (e.g. Front Panel SetPoint. This Info
diagnostic will automatically reset if the input returns to the
normal range.
Remote
External Chilled/Hot
Water Setpoint
Chiller
Warning
NonLatch 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).
This Info diagnostic will automatically reset if the input
returns to the normal range.
Remote
External Demand
Limit Setpoint
Chiller
Warning
NonLatch All
a. Not "Enabled": no diagnostics. b. "Enabled ": Out-Of-
Range Low or Hi or bad LLID, set diagnostic, default DLS to
next level of priority (e.g. Front Panel SetPoint. This Info
diagnostic will automatically reset if the input returns to the
normal range.
Remote
High Cprsr
Refrigerant
Discharge
Temperature
Chiller Immediate Latch
All
[compressor not
running or during
compressor run
unload]
The compressor discharge temperature exceeded 190°F.
This diagnostic will be suppressed if it occurs during the
compressor run-unload period or after the compressor has
stopped, but a run unload will be terminated early as a
result. Note: As part of the Compressor High Temperature
Limit Mode (aka Minimum Capacity Limit), the compressor
shall be forced loaded as the filtered discharge temperature
nears this trip-point.
Remote
High Differential
Refrigerant Pressure
Chiller Normal Latch
Chiller Energized
a. The system differential pressure was above 160 Psid-
trip immediately (normal shutdown)
b. The diff pressure was above 152 Psid - trip in 1 hour
Remote
High Evaporator
Liquid Level
Chiller Normal Latch
Starter Contactor
Energized [all Stop
modes]
The liquid level sensor is seen to be at or near its high end
of range for 80 contiguous minutes while the compressor is
running. (The diagnostic timer will hold, but not clear when
the circuit is off). Design: 80% or more of bit count
corresponding to +21.2 mm or more liquid level for 80
minutes)
Remote
High Evaporator
Refrigerant Pressure
Chiller
Immediate
and Special
Action
NonLatch All
The evaporator refrigerant pressure has risen above 190
psig. The evaporator water pump relay will be de-energized
to stop the pump regardless of why the pump is running.
The diagnostic will auto reset and the pump will return to
normal control when the evaporator pressures falls below
185 psig. This diagnostic must shutdown the chiller if it is
running.
Local
Diagnostics
To Next Page
Loading...
