Repair Procedures; Refrigerant Circuit; Checking Procedures - Daikin VRV IV+ Service Manual

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3 Check that the wiring corresponds with the wiring diagram, see
"6.2 Wiring diagram" on page 146.
Is all wiring between the
outdoor unit and the indoor
unit correct?
Yes
No
4.1.2

Repair procedures

To adjust the power supply
1 Make sure that the power source is in line with the requirements
described in the databook.
2 Adjust the power supply within 50 Hz ± 3%.
Is the problem solved?
Yes
No
To adjust the wiring between the outdoor unit and
the indoor unit
1 Adjust the wiring according to the wiring diagram and
connection diagram, see "6.2 Wiring diagram" on
2 Check that all wires are properly connected and that all
connectors are fully plugged‑in.
3 Check that no connectors or wires are damaged.
Is the problem solved?
Yes
No
To perform a communication reset
NOTICE
If an indoor unit is power OFF when communication reset
is performed, the outdoor unit will delete this indoor unit
information since this unit will not be identified during re-
initialization. If so, this unit will not be recognized by the
outdoor unit upon power restore to this indoor unit.
1 Set multimeter to V DC measurement. The example below is
performed while COM-F1 and V DC-F2, the polarity will be
opposite than the graph below if connected otherwise (which is
not a problem).
y
a
b
16 VDC
-16 VDC
c
y Voltage (VDC)
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
Action
Return to the troubleshooting of
the specific error and continue
with the next procedure.
Adjust the wiring where needed,
see "4.1.2 Repair procedures" on
page 133.
Action
No further actions required.
Return to the troubleshooting of
the specific error and continue
with the next procedure.
page 146.
Action
No further actions required.
Return to the troubleshooting of
the specific error and continue
with the next procedure.
e
f
x
d
4 Third party components
x Time
c
a Terminal F1
b Terminal F2
c 7-segment display
d Push button BS3
2 Push BS3 (RETURN) and hold it for 5 seconds until the 7-
segment display shows "000". Then release BS3.
Result: After a while, voltage will drop to almost 0 V DC. At this
stage it means that re-initialization has started.
Result: Depending on the system size, voltage will rise to
16 V DC and hit 0 V back again several times.
Result: When finished, 7‑Segment Display will turn OFF. This
indicates that re-initialization has completed.
The time this procedure takes, depends on the amount of indoor
units.
To adjust the wiring between the outdoor units
1 Adjust the wiring according to the wiring diagram and
connection diagram, see "6.2 Wiring diagram" on
2 Check that all wires are properly connected.
3 Check that no wires are damaged.
Is the problem solved?
Yes
No
4.2

Refrigerant circuit

4.2.1

Checking procedures

INFORMATION
It is recommended to perform the checks in the listed
order.
To check if the stop valves are open
Prerequisite: Remove the required plate work, see
work" on page 118.
1 Remove the caps.
d
a b
page 146.
Action
No further actions required.
Return to the troubleshooting of
the specific error and continue
with the next procedure.
"3.13 Plate
Service manual
133