Trane RTHC - Page 106

Diagnostic Table
100 RTHC-SVD01B-EN
Options Mod
Off-Brd 5V
Range
IFW
n/a
Options
1U5
all An improper Off Board 5v voltage was
detected at the Options Module. A 5vdc is
used for off-board devices such as the
External CWS and CLS, and pressure
transducers. The micro checks to see that
the A/D value falls within an acceptable
range.
Check Options Module
Voltages
Options Mod
Ref Voltage
Calibration
IFW
n/a
Option
1U5
all An improper reference voltage was
detected at the Options Module. A 2.5 vdc
reference is used to calibrate the non-
ratiometric analog I/O such as 2-10vdc and
4-20ma inputs as well as PWM Analog
outputs. The micro checks to see that the
A/D value falls within an acceptable range.
Options: Loss
of Comm with
Chiller
IFW
n/a
Option
1U5
All The options module lost communications
with the Chiller module for 15 contiguous
seconds.
Check IPC Wiring/
Connections.
Options: Loss
of Comm with
Starter
IFW
n/a
Option
1U5
All The options module lost communications
with the Starter module for 15 contiguous
seconds.
Check IPC Wiring/
Connections.
Outdoor Air
Te m p Se n so r
(outdoor air
reset selected)
IFW
n/a
Chiller
1U1
All Open or Short
a. Use end of range value (whatever value
the open or short gives).
b. Clear diag. when the resistance returns
to normal range.
Check Sensor, Wiring &
Connections.
Outdoor Air
Te m p Se n so r
(Outdoor Air
not selected.)
none
n/a
none
All Open or Short
a. Display end of range
value. (dashes "-----")
Over Voltage MAR
friendly
Starter
1U2
Pre-Start a. Line voltage above + 10% of nominal.
(Must hold = + 10 % of nominal. Must trip =
+ 15 % of nominal. Reset differential = min.
of 2% and max. of 4%. Time to trip =
minimum of 1 min. 10 sec. and maximum
of 5 min. 20 seconds) Design: Nominal
trip: 60 s
Check main power
supply & wiring. Check
Under-Over Voltage
Transformer.
Phase Loss MMR
immediate
Starter
1U2
Contactor
Energized or
all Start, and
Run modes.
No current was sensed on one or more of
the CT inputs. Time to trip shall be 1
second minimum, 3 seconds maximum.
Actual trip point is 10%.
Check main power
supply & wiring. Check
current transformers.
Table 14-2: Diagnostic Table
Diagnostic
Description
Type/
Shutdown
Action
Module
Calling
Out Diag.
Operating
Modes
Diagnostic is
Active
Cause Help Message