Trane Optimus RTHD Installation, Operation And Maintenance Manual page 80

Diagnostics
Table 26. Main processor diagnostics (continued)
Diagnostic
Name and Affects
Source Target Severity
Low Evaporator Warning
Water Temp Chiller and Special
(Unit Off) Action
Low Evaporator Immediate
Water Temp Chiller and Special
(Unit On) Action
Low Oil Flow Chiller Immediate Latch
Motor Winding
Chiller Warning
Temp Sensor
MP: Invalid
Platform Immediate Latch
Configuration
MP: Reset Has
Chiller Warning
Occurred
No Differential
Refrigerant Chiller Immediate Latch
Pressure
Oil Flow
Chiller Immediate Latch
Protection Fault
Oil Pressure
Chiller Normal
Transducer
Outdoor Air Warning
Temperature Chiller and Special
Sensor Action
Refrigerant
Chiller Warning
Monitor Input
Restart Inhibit Chiller Warning
Software Error
Number: 1001 All
Immediate
Call Trane functions
Service
Starter Failed to
Chiller Warning
Arm/Start
Starter Module
Memory Error Chiller Warning
Type 1
80
Active Modes
[Inactive
Persistence Modes]
Unit in Stop Mode,
or in Auto Mode and
NonLatch
No Ckt(s) Energized
[Any Ckt Energized]
Any Ckt[s]
NonLatch Energized [No
Ckt(s) Energizd]
Chiller Energized
and Delta P above
15 Psid
Latch All
All
NonLatch All
Chiller Energized
Starter Contactor
Energized [all Stop
modes]
Latch All
Latch All
NonLatch All–if installed
NonLatch All
Latch – power
down reset is all
reqd
Latch All
Latch All
Criteria
The 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 Evap Water pump Relay
until diagnostic auto resets, then return to normal evap
pump control. Automatic reset occurs when the temp rises
2°F (1.1°C) above the cutout setting for 30 minutes.
The Evaporator water temp. fell below the cutout setpoint
for 30 degree F Seconds while the compressor was
running. Automatic reset occurs when 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.
The oil pressure was out of the acceptable pressure range
for 15 seconds, while the Delta Pressure was greater than
15 Psid.: Acceptable range is 0.50 or 0.60 > (PC-Po) / (PC-
PE) for the first 2.5 minutes of operation, and 0.40 or 0.50
> (PC-Po) / (PC-PE) thereafter. The higher ratios used if the
system DP is less than 23 psid
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 Warning)
MP has an invalid configuration based on the current
software installed
The main processor has successfully come out of a reset
and built its application. A reset may have been due to a
power up, installing new software or configuration. This
diagnostic is immediately and automatically cleared and
thus can only be seen in the Historic Diagnostic List in
Tracer TU.
The system differential pressure was below 7.7 Psid. The
occurrence of this diagnostic will saturate the above "Low
Diff Rfgt Press" Integral and invoke the same "Compressor
Cool Down" op mode.
The Oil Pressure Transducer for this Chiller is reading a
pressure either above its Condenser Pressure by 15 Psia or
more, or below its Evaporator Pressure 10 Psia or more for
30 seconds continuously.
Bad Sensor or LLID
Bad Sensor or LLID. This diagnostic will only occur if OA
sensor is configured. OA Chilled water reset will be
suspended if selected and Tracer OA unavailable.
Open or Shorted input and the Rfgt Monitor is setup as
installed
The Restart Inhibit was invoked on a compressor. This
indicates excessive chiller cycling which should be
corrected.
A high level software watchdog has detected a condition in
which there was a continuous 5 minute period of
compressor operation, with neither chilled water flow nor
a" contactor interrupt failure" diagnostic active. The
occurrence of this software error message suggests an
internal software state chart misalignment has occurred.
The events that led up to this failure, if known, should be
recorded and transmitted to Trane Controls Engineering –
(SW rev 6 and higher)
Starter failed to arm or start within the allotted time (2
minutes).
Checksum on RAM copy of the Starter LLID configuration
failed. Configuration recalled from EEPROM.
Reset
Level
Remote
Remote
Local
Local
Remote
Remote
Remote
Local
Remote
Remote
Remote
Remote
local
Remote
Local
RTHD-SVX01K-EN