20 Technical data
Installation and operation manual
43
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546220-1C – 2020.10
Main code Sub code Cause Solution
Master Slave 1 Slave 2
Connection malfunction over indoor
units or type mismatch (R410A,
R407C, RA, Hydrobox, etc)
Check if other indoor units have
malfunction and confirm indoor unit
mix is allowed.
Connection malfunction over indoor
units or type mismatch (R410A,
R407C, RA, Hydrobox, etc)
Check if other indoor units have
malfunction and confirm indoor unit
mix is allowed.
Wrong unit combination (multi system) Check if unit types are compatible.
Wrong unit combination (multi system) Check if unit types are compatible.
Auto address malfunction
(inconsistency)
Check if transmission wired unit
amount matches with powered unit
amount (by monitor mode) or wait till
initialisation is finished.
Auto address malfunction
(inconsistency)
Check if transmission wired unit
amount matches with powered unit
amount (by monitor mode) or wait till
initialisation is finished.
Stop valve closed or wrong (during
system test run)
Open stop valves.
Auto charging related
— Unusual low pressure on suction line 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.
— Freeze-up prevention indoor unit Close valve A immediately. Push BS1
to reset. Retry autocharge procedure.
— Automatic charging nearly finished Prepare for autocharge stopping.
— Automatic charging finished Finish autocharge mode.
Leak detection function related
— Unit is not prepared to execute leak
detection operation
Refer to requirements to be able to
execute leak detection operation.
— Indoor unit is out of temperature range
for leak detection operation
Retry when ambient conditions are
satisfied.
— Outdoor unit is out of temperature
range for leak detection operation
Retry when ambient conditions are
satisfied.
— Too low pressure was noticed during
leak detection operation
Restart leak detection operation.
— Indicates an indoor unit which is not
compatible with leak detection
functionality is installed (e.g., RADX
indoor unit, Hydrobox, …)
Refer to requirements to be able to
execute leak detection operation.
20 Technical data
▪ A subset of the latest technical data is available on the regional
Daikin website (publicly accessible).
▪ The full set of latest technical data is available on the Daikin
Business Portal (authentication required).
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).
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