57
Failure code
LD
indication
on master
unit
Indication
on wired
controller
(hex)
Failure code
definition
Failure description
Remarks
39-1
27
Compression
ratio ε
protection
against too high
ratio
After compressor starts up, ε>8.0 is
detected for 5 mins continuously, stop
and alarm; ε>9.0 is detected for 1min
continuously under cooling or ε>8.5 under
heating, stop and alarm.
Resume automatically after 170 secs.
Four times an hour, failure confirmed.
Once
confirmation,
Un-
Resumable
40
28
High pressure
sensor Pd
protection
against too high
pressure
After compressor starts up, Pd≥4.15MPa
continues for 2 secs, stop and alarm.
Resume automatically after 170 secs.
Four times an hour, failure confirmed.
(similar to high pressure switch alarm)
Once
confirmation,
Un-
Resumable
41-0
29
Water inlet
temp. Twi
protection
against too low
temp. (Water
Cooled VRF)
Water Cooled VRF, after compressor
starts up, water inlet temp. Twi<5 degree
continues for 60 secs, stop and alarm.
Resume automatically after 170 secs.
Three times an hour, failure confirmed.
Once
confirmation,
Un-
Resumable
41-1
29
Water inlet
temp. Twi
protection
against too high
temp. (Water
Cooled VRF)
When BM1-4 ON setting.
Water Cooled VRF, after compressor
starts up, water inlet temp. Twi>45 degree
continues for 60 secs, stop and alarm.
Resume automatically after 170 secs.
Three times an hour, failure confirmed.
42-0
2A
Water system
outlet antifreeze
protection
(Water Cooled
VRF)
Water Cooled VRF, after compressor
starts up, water outlet temp. Two<3
degree continues for 180 secs, stop
and alarm. Two>7 degree for 60 secs
continuously, resume. No lock.
Once
confirmation,
Un-
Resumable
42-1
2A
Water system
low pressure
antifreeze
protection
(Water Cooled
VRF)
Water Cooled VRF, Two<Tao+5°C
continues for 60 secs when the
compressor stops in protection for low
ambient temp. Tao<4°C. No lock.
42-2
2A
The water
flow too small
protection (MRV
W)
After the compressor running, if the temp.
difference between Twi and Two too large,
the unit stop and alarm. 2 minutes and
50 seconds later resume automatically, it
occurs 3 times in an hour, comfirms the
failure.