Installation and Maintenance Manual

Diagnostics
82 RTAE-SVX001B-EN
Low Evaporator
Water Temp
(Unit Off)
Evap Pump
and Freeze
Avoidance
Request
Relay
Info and
Special
Action
NonLatch
Unit in Stop
Mode, or in Auto
Mode and No
Ckt(s) Energzd
[Any Ckt
Energzd]
Either the entering or leaving evaporator water temp fell below
the leaving water temp cutout setting for 30°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 Temp:
Unit On
Chiller
Immediate
Shutdown
and Special
Action
NonLatch
Any Ckt[s]
Energzd [No
Ckt(s) Energzd]
The evaporator entering or leaving water temp fell below the
cutout setpoint for 30°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 -
Cprsr2A
Circuit Immediate Latch
Cprsr Energized
and Delta P
above 15 Psid
The oil pressure transducer for this compressor was indicating
an unacceptable oil pressure drop as a % of the available oil
pressure to move oil, suggesting significantly reduced oil flow
to the compressor. Possible root causes include oil line service
valve closed or restricted, dirty or restricted oil filter, or
compressor oil line kepner valve malfunction.
Local
Low Oil Flow -
Cpsr 1A
Circuit Immediate Latch
Cprsr Energized
and Delta P
above 15 Psid
The oil pressure transducer for this compressor was indicating
an unacceptable oil pressure drop as a % of the available oil
pressure to move oil, suggesting significantly reduced oil flow
to the compressor. Possible root causes include oil line service
valve closed or restricted, dirty or restricted oil filter, or
compressor oil line kepner valve malfunction.
Local
Low Oil Return
or AFD Cooling
– Ckt1
Circuit Info NonLatch
All Ckt Running
Modes
The evaporator’s spillover tank refrigerant liquid level, which
feeds the oil return and drive cooling heat exchanger, is seen
to be less than 90% of its min level for 20 continuous minutes
– reset when level gets to 88% of min level. The occurrence of
this warning in conjunction with the “Loss of Oil (Running)” or
any of the” AFD Over Temp” shutdown diagnostics, suggests
either EXV problems or loss of charge is a contributing factor.
Low Oil Return
or AFD Cooling
– Ckt2
Circuit Info NonLatch
All Ckt Running
Modes
The evaporator’s spillover tank refrigerant liquid level, which
feeds the oil return and drive cooling heat exchanger, is seen
to be less than 90% of its min level for 20 continuous minutes
– reset when level gets to 88% of min level. The occurrence of
this warning in conjunction with the “Loss of Oil (Running)” or
any of the” AFD Over Temperature” shutdown diagnostics,
suggests either EXV problems or loss of charge is a contributing
factor.
Motor Winding
Temp Sensor -
Cprsr1A
Circuit Info or None Latch All
Both of the motor winding temperature sensors are seen to be
out of their normal range. (Severity is adjustable via TU Service
Tool – default is Info)
Local
Motor Winding
Temp Sensor-
Cprsr2A
Circuit Info or None Latch All
Both of the motor winding temperature sensors are seen to be
out of their normal range. (Severity is adjustable via TU Service
Tool – default is Info)
Local
MP Application
Memory CRC
Error
Chiller Immediate Latch All Modes Memory error criteria TBD Remote
MP: Could not
Store Starts
and Hours
None Info Latch All
MP has determined there was an error with the previous power
down store. Starts and Hours may have been lost for the last
24 hours.
Remote
MP: Invalid
Configuration
None Immediate Latch All
MP has an invalid configuration based on the current software
installed.
Remote
MP: Non-
Volatile
Memory
Reformat
None Info Latch All
MP has determined there was an error in a sector of the Non-
Volatile memory and it was reformatted. Check settings.
Remote
Table 33. Main processor diagnostics (continued)
Diagnostic
Name
Affects
Target Severity Persistence
Active Modes
[Inactive
Modes] Criteria
Reset
Level