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Handling refrigerant
The air to water outdoor unit is filled with R410A refrigerant.
▶ Only qualified and authorised refrigeration engineers may work on
the refrigerant circuit.
▶ For all work with refrigerant, wear suitable safety gloves and goggles.
What to do if refrigerant leaks
If refrigerant leaks and touches the skin, it can cause frostbite.
▶ In case of a refrigerant leak, never touch any part of the air to water
outdoor unit.
▶ Avoid skin or eye contact with refrigerant.
▶ Seek medical attention if you get refrigerant on your skin or in your
eyes.
▶ If the refrigerant leaks please contact your installer immediately.
Handover to the user
When handing over the heating system, instruct the user in its operation
and operating conditions.
▶ Explain the operation - with particular emphasis on all safety-related
actions.
▶ Explain that conversions and repairs must only be carried out by an
approved contractor.
▶ Point out the need for inspections and maintenance for safe and
environmentally-compatible operation.
▶ The installation and operating instructions must be given to the user
for keeping.
2.2
List of error codes
HMI Error code ODU Error code Description
5600, 5601
21
5602, 5603
22
5604, 5605
23
5610, 5611
26
5612, 5613
27
5616, 5617
29
5618, 5619
32
5666, 5667
35
5622, 5623
41
5662, 5663
43
5624, 5625
44
5626, 5627
45
5628, 5629
46
Table 3 Error codes
Split ODU – 6 720 817 722 (2015/06)
DC Peak (IPM Fault)
IPM = Intelligent Power module
CT 2 (Max CT)
DC Link Voltage is low or high
Problem in DC Compressor
positioning
PSC Fault
High current at Compressor
phases
Temperature at discharge-pipe is
too high
Low Pressure error
Problem in discharge-pipe
temperature sensor
High-pressure sensor (Open/
Short)
Problem in ambient temperature
sensor
Problem in condenser-middle-pipe
temperature sensor
Problem in suction-pipe
temperature sensor
Error handling instructions for Split outdoor unit
2
Error handling instructions for Split outdoor unit
2.1
Names of units
Supplier name for ODU
AHUW036A2
AHUW056A2
AHUW076A2
AHUW096A2
AHUW126A2
AHUW146A2
AHUW156A2/166A2
AHUW128A2
AHUW148A2
AHUW158A2/168A2
Table 2 Names of units
Error characteristc Remark
Restart 10x/hour,
Compressor broken or too much refrigerant in
then blocked
compressor
Restart after
Inverter current > 14 A
problem has
vanished
Restart after
Direct voltage
problem has
1~: <140 VDC or >480 (3kW: 420) VDC
vanished
3~: <320VDC or >780VDC
Restart 10x/hour,
Wrong orientation of compressor connections
then blocked
(UVW)
Restart 10x/hour,
High current IGBT (check reactor)
then blocked
Restart 10x/hour,
then blocked
Restart after
Hot gas temperature TH5 >105
problem has
refrigerant load)
vanished
Restart 3x/hour,
Low Pressure < 0 kPa
then blocked
(
49.5
–
°C
Sensor TH5 broken (200k
Direct shut-down
LP/HP sensor broken
Direct shut-down
Direct shut-down
Sensor TH7 broken (10k
Sensor TH8 broken (5k
Direct shut-down
Sensor TH4 broken (5k
Direct shut-down
BTT name for ODU
ODU Split 2
ODU Split 4
ODU Split 6
ODU Split 8
ODU Split 11s
ODU Split 13s
ODU Split 15s
ODU Split 11t
ODU Split 13t
ODU Split 15t
(check
°C
)
>25
)
°C
>25
°C
)
>25
)
°C
>25
)
°C
3
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