Trane CVRC-M-1D Manual page 103

Diagnostic Description
Low Oil Flow
Low Oil Temp
Max Acceleration Setpts. Error
Max Pumpout Rate Exceeded
(Prg)
Max Pumpout Rate Exceeded-Svc
(Prg)
Memory Error Type I: NOVRAM
Memory Error Type II: Shadow
RAM
Memory Error Type III
Memory Error Type IV
Momentary Power Loss
CVRC-M-1D
Diagnostics Tables
Diag. Active
Diag Modes Cause
Type (Non-Active
Modes)
MMR Compressor The differential oil pressure switch remained open for more than
Energized 20 contiguous seconds compressor A.
MAR All Running The oil temperature dropped below it's adjustable low oil temp.
Modes cutout. ("Instantaneous trip" but consistent with the analog input
filtering function.) Automatic Reset of the MAR diag shall occur
5° F (2.8C) above the cutout setpoint.
IFW All The redundant Maximum Acceleration settings did not agree for
30 contiguous seconds. (Continue to use the previous value for
the 30 second timeout.) When this diagnostic occurs the
affected Starter Module shall use 6 seconds as a default until
either the UCM is reset or, if the redundant settings agree again,
the starter module can go back to using the actual setting.
IFW All IFW to the chiller, MAR to the Purge
IFW All IFW to the chiller, MAR to the Purge.
MMR On UCM On UCM either power up or following a Type II Memory Error a
Power Up NOVRAM memory error was detected. The UCM is operating on
or following all Engineering Rom defaults for all setup parameters. Check all
a Type II setup parameters and continue to run chiller. Replace the Chiller
Memory Module as soon as a replacement is available. Note: It is
error diag. expected that this diagnostic will be detected on the very first
power up of the Chiller Module at the Manufacturer since the
NOVRAM will not contain valid data on first power up.
IFW All A Shadow RAM memory error was detected. The UCM is
operating on all last valid values (pulled from NOVRAM) for all
setup parameters. No setup parameter changes were pending
to be loaded into NOVRAM, a complete recovery of all setup
parameters was made and there is no need to check unit setup
parameters. Compressor starts and hour were lost for not more
than the last 24 hours. This is expected to be an isolated event
and repair or replacement is not required. If this diagnostic does
occur repeatedly, then replace the Chiller Module.
IFW All A Shadow RAM memory error was detected. The UCM is
operating on all last valid values (pulled from NOVRAM) for all
setup parameters. No setup parameter changes were pending
to be loaded into NOVRAM, a complete recovery of all setup
parameters was made and there is no need to check unit setup
parameters. Compressor starts and hour were lost for not more
than the last 24 hours. This is expected to be an isolated event
and repair or replacement is not required. If this diagnostic does
occur repeatedly, then replace the Chiller Module.
IFW All A page timeout error was detected while tying to write data into
EEPROM. There will likely be a recall of engineering ROM
defaults on the next reset or power transition. Replace the chiller
module as soon as a replacement is available.
MAR All Running Power Interruption.
Modes
(Start Mode,
e.g. Before
Transition)
Help Message
See Troubleshooting
Service Bulletin
See Troubleshooting
Service Bulletin
CVHE-SB-32
Review Max
Acceleration Set Up
Purge Inop: See Purge
O & M Manual
Purge Inop: See Purge
O & M Manual
Call Service to Check
all Settings
No Settings Were Lost
Settings Changed in the
Last 24 Hours Lost.
Call service to check all
settings.
Determine Cause of
Power Interruption
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