20 Technical data
Installation and operation manual
44
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P546222-1B – 2020.10
Main code
Sub code
Cause
Solution
Master
Slave 1
Slave 2
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. 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).
a
b
a
c
d
a
b
a
e
d
e
c
a
b
a
e
d
f
c
a
b
a
e
b
d
c
a
b
a
e
d
f
c
Summary of Contents for REYQ8U7Y1B
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