20 Technical Data; Service Space: Outdoor Unit - Daikin VRV IV+ RXYTQ8U5/U7YF Installation And Operation Manual

20 Technical data

Main code
Master
Auto charging related
Leak detection function related
20 Technical data
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20.1

Service space: Outdoor unit

Make sure the space around the unit is adequate for servicing and
the minimum space for air inlet and air outlet is available (refer to the
figure below and choose one of the possibilities).
Installation and operation manual
36
Sub code
Slave 1 Slave 2
Auto address malfunction
(inconsistency)
Stop valve closed or wrong (during
system test run)
— Unusual low pressure on suction line
— Freeze-up prevention indoor unit
— Automatic charging nearly finished
— Automatic charging finished
— Unit is not prepared to execute leak
detection operation
— Indoor unit is out of temperature range
for leak detection operation
— Outdoor unit is out of temperature
range for leak detection operation
— Too low pressure was noticed during
leak detection operation
— Indicates an indoor unit which is not
compatible with leak detection
functionality is installed (e.g., RA DX
indoor unit, Hydrobox, ...)
Cause
Check if transmission wired unit
amount matches with powered unit
amount (by monitor mode) or wait till
initialisation is finished.
Open stop valves.
Close valve A immediately. Push BS1
to reset. Check following items before
retrying autocharge procedure:
▪ Check if the gas side stop valve is
opened correctly.
▪ Check if the valve of the refrigerant
cylinder is opened.
▪ Check if the air inlet and outlet of the
indoor unit are not obstructed.
Close valve A immediately. Push BS1
to reset. Retry autocharge procedure.
Prepare for autocharge stopping.
Finish autocharge mode.
Refer to requirements to be able to
execute leak detection operation.
Retry when ambient conditions are
satisfied.
Retry when ambient conditions are
satisfied.
Restart leak detection operation.
Refer to requirements to be able to
execute leak detection operation.
b
c
a a
a a
d
b
c
e
f
a
a
d
b
c
e
f
a
a
d
VRV IV+ heat pump for high ambient temperatures
Solution
b
c
e e
d
b
c
e
d
a
a
b
RXYTQ
4P546223-1C – 2021.11