AC-SVX003A-EN
109
Table 31. Diagnostics — main processor (continued)
Diagnostic
Name
Affects Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
Low Evaporator
Water Flow
Chiller
Warning
NonLatch
Chiller Auto,
manual water
pump and All
Running Modes
a. The evap. water flow measurement option was installed
and the flow dropped to or below the Evaporator Low Water
Flow Warning Setpoint. This diagnostic shall be Auto Reset
when flow is (0.1 gpm/ton * NTON) above the adjustable
trippoint or when the Evaporator water pump is turned off.
b. See Water_Flow_and_Tons_Sensing.doc specification
for additional information.
Remote
Low Evaporator
Water
Temperature
(Unit Off)
Chiller
Special Action
NonLatch
Unit in Stop
Mode, or in Auto
Mode and No Ckt
(s) Energized
[Any Ckt
Energized]
Either the entering or leaving evaporator water temp fell
below the leaving water temp cutout setting for 30 degree
F-seconds while the Chiller is in the Stop mode, or in Auto
mode with no compressors running. Energize Freeze
Avoidance Request Relay and Evap Water Pump Relay
until diagnostic auto resets, then de-energize the Freeze
Avoidance Request Relay and return to normal evap pump
control. Automatic reset occurs when both temps rise 2°F
(1.1°C) above the cutout setting for 5 minutes, or either
circuit starts. This diagnostic even while active, does not
prevent operation of either circuit.
Remote
Low Evaporator
Water
Temperature
(Unit On)
Chiller
Immediate
Shutdown and
Special Action
NonLatch
Any Ckt[s]
Energized
[No Ckt(s)
Energized]
The evaporator entering or leaving water temperature fell
below the cutout setpoint for 30 degree F Seconds while
the compressor was running. Automatic reset occurs when
both of the temperature rises 2°F(1.1°C) above the cutout
setting for 2 minutes. This diagnostic shall not de-energize
the Evaporator Water Pump Output.
Remote
Low Oil Flow - xy Cprsr
Immediate Latch
Cprsr Energized
and
Delta P above 15
Psid
The intermediate oil pressure sensor for this compressor
was out of the acceptable pressure range for 15 seconds,
while the Delta Pressure was greater than 15 Psid. See Oil
Flow Protection
Local
Low Refrigerant
Temperature
Circuit Immediate Latch
All Ckt Running
Modes
The warmer of either the either the Evaporator Refrigerant
Pool Temperature or Active Rfgt Sat Temp for the
respective circuit dropped below the Low Refrigerant
Temperature Cutout Setpoint for 2250°F-sec (12°F-sec max
rate for early circuit startup period) while the circuit was
running. The minimum LRTC setpoint is -5°F the point at
which oil separates from the refrigerant. The integral is held
nonvolatile though power down, is continuously calculated,
and can decay or build during the circuit off cycle as
conditions warrant.
Remote
Low Suction
Refrigerant
Pressure - xy
Cprsr
Immediate Latch
Cprsr Prestart
and Cprsr
Energized
A. The Suction Pressure dropped below 10 Psia just prior to
compressor start (after EXV preposition). (compressor is
the lead compressor in circuit)
B. During Early Startup Period: the Suction Pressure fell
below a pressure equal to Condenser Pressure ÷ 8 but as
limited to not less than 6 or greater than10 psia.
C. After Early Startup Period expires: The Suction Pressure
fell below 16 Psia.
Local
Mfr Maintenance
Recommended -
xy
Cprsr Warning
Latch
Service
Messages
Enabled
Compressor service recommended as service interval
hours have elapsed.
Remote
Motor Winding
Temperature
Sensor - xA
Cprsr
Warning(default)
or Normal
Latch All
Bad Sensor or LLID. See High Motor Winding Temperature
Protection functional spec for other key details related to
setting and the effects of the setting on the Severity.
Remote
MP: Invalid
Configuration
Platform
Warning
Latch All
MP has an invalid configuration based on the current
software installed. The unit will niot be allowed to run until a
valid configuration is saved.
Remote
Diagnostics
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