Diagnostics Menu
76 CVHE-CLD-1A
Options Module 24 Vdc Ref
Missing
IFW Options All 24Vdc reference missing and the differential
water pressure transducers are installed.
Check Press
Xducer Wiring/
24 Vdc Supply.
Options Module 24 Vdc Ref
Missing
MMR Options All 24Vdc reference missing and the differential
water pressure transducers are installed and
Adaptive Frequency Drive installed.
Check Press
Xducer Wiring/
24 Vdc Supply.
Options Mod Off-Brd 5V Range IFW Options 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 Options 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.
See
Troubleshooting
Service Bulletin
Outdoor Air Temp Sensor
See Also 3d3 diag.
(Either Outdoor Air Reset or
Low Ambient Lockout Selected)
IFW Chiller 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 And
Connections
Outdoor Air Temp Sensor
See Also 3d3 diag.
(Both Outdoor Air Rst and Low
Ambient Lockout not selected.)
None None All Open or Short
a. Display end of range value. (dashes “-----”)
N/A
Outdoor Air Temp Sensor
See also A1 and A2 diag.
MMR Chiller All Open or Short Check Sensor,
Wiring And
Connections
Over Voltage MAR Starter Pre-Start
and Any
Ckt(s)
Energzd
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)
Check Main
Power Supply &
Wiring
Phase Loss MMR Starter Contactor
Energizd
or all
Start, and
Run
modes.
a. No current was sensed on one or more of the
current xformer inputs. (Must hold = 20% RLA.
Must trip = 5% RLA.) Time to trip shall be 1
second minimum, 3 seconds maximum. Actual
design trip point is 10%.
b. Phase rotation protection is enabled and
either the Phase A current signal or the Phase C
current is less than approximately 5% of the CT
rating. Time to trip is 0.7 seconds for CTV/ABS.
Check Main
Power Supply &
Wiring
Phase Reversal MMR Starter Contactor
energized
to
transition
command
a. A phase reversal was detected on the
incoming current. On a compressor startup the
phase reversal logic must detect and trip in 0.7
seconds.
Check Main
Power Supply &
Wiring
Phase Reversal Protection Lost MMR Starter Starter
Contactor
energized
to
transition
command
a. The phase reversal protection on the
compressor has become inoperative. The phase
rotation protection system failed to detect 2 in a
row of one of the four phase circuit states; Phase
reversal, Phase rotation OK, Phase A lost,
Phase B lost.
Check Starter
Module.
DIAGNOSTIC DESCRIPTION
Diag
Type
Module
that
Called
Diag.
Diag.
Active
Modes
CAUSE Help Message
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