Trane RTHC - Page 104

Diagnostic Table
98 RTHC-SVD01B-EN
Low Pressure
Cutout
MMR
immediate
Stepper
1U3
All The Low Pressure Cutout opened for more
than 0.5-2 Seconds. C.O. on fall @ 0 psig
(+/- 3 psi), reset @ 20 psig (+/-5psi). The
LPC is set primarily to detect significant
charge loss and thus ignore times at startup
are not required (The sat evap temp sensor
is used for low temp / low pressure
detection but it cannot function if saturated
conditions are not present such as in the
event of charge loss)
LPC switch, refrigerant
charge.
Max
Acceleration
Setpts Error
IFW
n/a
Starter
1U3
All a. The redundant Maximum Acceleration
settings did not agree for 30 contiguous
seconds. (Continue to use the previous
value for the 30 second time-out.) When
this diagnostic occurs the affected Starter
Module shall use 6 seconds as a default
until either
Review Max
Acceleration Set Up.
Memory Error
Type I:
NOVRAM
MMR
friendly
Chiller
1U1
On UCM
Power Up or
following a
Type II
Memory error
diag.
On UCM power up a Type II Memory Error
a NOVRAM memory error was detected.
The UCM is operating on all Engineering
ROM defaults for all setup parameters.
Check all setup parameters and continue to
run chiller. Replace the Chiller module
ASAP.
Reprogram all menus. If
this occurs more than
one time, replace the
Chiller module.
Memory Error
Type II:
Shadow RAM
IFW
n/a
Chiller
1U1
All The UCM is operating on all last valid
values (pulled from NOVRAM) for all setup
parameters. Settings are not lost but if
diagnostic is re-occurring replace the
Chiller module.
Confirm settings are
accurate.
Memory Error
Type III
IFW
n/a
Chiller
1U1
All The UCM is operating on all last valid
values (pulled from NOVRAM) for all setup
parameters. Settings are not lost but if
diagnostic is re-occurring replace the
Chiller module.
Settings changed in the
last 24 hours lost.
Memory Error
Type IV
IFW
n/a
Chiller
1U1
All A page time-out error was detected while
trying to write data into EPROM. 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.
Reprogram all menus.
Table 14-2: Diagnostic Table
Diagnostic
Description
Type/
Shutdown
Action
Module
Calling
Out Diag.
Operating
Modes
Diagnostic is
Active
Cause Help Message