Trane Ascend ACR C Series Installation, Operation And Maintenance Manual page 109

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