DC Inverter Multi VRF System User Manual
24
Content symbol
Division symbol
6
7
8
9
A
H
Indoor
L
Mode shock
No main IDU
Power supply is
insufficient
1-to-more:
number of IDU
is inconsistent
1-to-more:
IDU series is
inconsistent
Alarm due to
bad air quality
(Fresh air unit)
d
Malfunction
of exit-tube
temperature
sensor
Malfunction of
humidity sensor
Malfunction of
jumper cap
Web address of
IDU is abnormal
PCB of wired
controller is
abnormal
J
Gas-mixing
protection of
4-way valve
High pressure
ratio protection
of system
Low pressure
ratio protection
of system
Protection due
to abnormal
pressure
b
Malfunction
of inlet temp
sensor of gas-
liquid separator
Malfunction
of outlet temp
sensor of gas-
liquid separator
Malfunction of
heat exchanger
temperature
sensor
Clock of system
is abnormal
P
Drive IPM
module
protection of
compressor
Malfunction
of drive
temperature
sensor of
compressor
Drive IPM high
temperature
protection of
compressor
Desynchronizing
protection
of inverter
compressor
High-voltage
protection of
compressor’s
drive DC bus
bar
H
Drive IPM
module
protection of fan
Malfunction
of drive
temperature
sensor of fan
Drive IPM high
temperature
protection of fan
Desynchronizing
protection of
inverter fan
High-voltage
protection of
fan’s drive DC
bus bar
Debugging
U
Alarm because
valve is
abnormal
Short-circuit
malfunction of
IDU
Malfunction of
pipe-line for
ODU
C
Emergency
status of
compressor
Emergency
status of fan
Rated capacity
is too high
Status
A
Heat pump
function setting
Quiet mode
setting
Vacuum pump
mode
IPLV test
EU AA level
EER test mode
Heating
n Inquiry of project
code of IDU
Inquiry of
malfunction
Inquiry of
parameters
Heat pump unit Heating only unit
Content symbol
Division symbol
C
L
E
F
J
P
Indoor
L
Models for IDU
and ODU are
not matched
d
Abnormal setting
for capacity
button
Malfunction of air-
outlet temperature
sensor(Fresh air
unit)
Malfunction
of indoor CO
2
sensor (fresh air
unit)
E
Drop protection
of discharge
temperature
sensor of
compressor 1
F
Malfunction of
DC motor
J
High-pressure
protection
P
Drive current
detection circuit
malfunction of
compressor
Low-voltage
protection of
compressor’s
drive DC bus bar
Phase-lacking
of inverter
compressor
Drive charging
circuit
malfunction of
compressor
Failure startup
of inverter
compressor
AC current
protection
of inverter
compressor
H
Drive current
detection circuit
malfunction of
fan
Low-voltage
protection of
fan’s drive DC
bus bar
Phase-lacking of
inverter fan
Drive charging
circuit
malfunction of
fan
Failure startup
of inverter fan
AC current
protection of
inverter fan
