Diagnostics
RTHD-SVX01K-EN 77
Evap Water Flow
(Entering Water
Temp)
Chiller Warning NonLatch
Any Ckt(s)
Energized [No
Ckt(s) Energized]
The entering evaporator water temp fell below the leaving
evaporator water temp. by more than 2°F for 100 °F-sec.
For falling film evaporators this diagnostic cannot reliably
indicate loss of flow, but can warn of improper flow
direction through the evaporator, mis-bound temperature
sensors, or other system problems
Remote
Evaporator Diff
Water Pressure
Xdcr
Chiller Warning Latching All
Defective Sensor or LLID
a. Display invalid value
b. Flow calculation shall be disabled.
c. See Water Flow and Tons Sensing specification for
additional information.
Remote
Evaporator
Entering Water
Temp Sensor
Chiller
Warning
and Special
Action
Latch
Bad Sensor or LLID Normal operation unless CHW Reset is
enabled. If CHW Reset is enabled and either Return or
Constant Return Chilled Water Reset is selected, its effect
will be removed b ut s le w rates on th e c han ge wi ll b e limit ed
per the Chilled Water Reset spec.
Remote
Evaporator
Leaving Water
Temp Sensor
Chiller Normal Latch All Bad Sensor or LLID Remote
Evaporator
Liquid Level
Sensor
Chiller Normal Latch All Bad Sensor or LLID Remote
Evaporator Rfgt
Pressure
Transducer
Chiller Normal Latch All Bad Sensor or LLID Remote
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
Excessive
Condenser
Pressure
Chiller Immediate Latch All
The condenser pressure transducer of this chiller has
detected a pressure in excess of the safe high side pressure
as limited by the particular compressor type or the
evaporator distributor present on this particular chiller.
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-
R
ange 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
External Heat
Recovery Tank
Water
Temperature
Setpoint Input
Heat
Recovery
Warning NonLatch All Bad Sensor or LLID. Remote
Table 26. Main processor diagnostics (continued)
Diagnostic
Name and
Source
Affects
Target Severity Persistence
Active Modes
[Inactive
Modes] Criteria
Reset
Level
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