About Service Mode Operation; To Use Vacuum Mode; To Recover Refrigerant - Daikin VRV IV Installer And User Reference Manual

23 | Maintenance and service

23.2 About service mode operation

23.2.1 To use vacuum mode

23.2.2 To recover refrigerant

Installer and user reference guide
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3 To prevent damaging the PCB, touch a non-coated metal part to eliminate
static electricity before pulling out or plugging in connectors.
4 Pull out junction connectors X1A, X2A (X3A, X4A) for the fan motors in the
outdoor unit before starting service operation on the inverter equipment. Be
careful not to touch the live parts. (If a fan rotates due to strong wind, it may
store electricity in the capacitor or in the main circuit and cause electric
shock.)
5 After the service is finished, plug the junction connector back in. Otherwise
the malfunction code
outdoor unit 7‑segment display and normal operation will not be performed.
For details refer to the wiring diagram labelled on the back of the electrical
component box cover.
Pay attention to the fan. It is dangerous to inspect the unit while the fan is running.
Make sure to turn off the main switch and to remove the fuses from the control
circuit located in the outdoor unit.
Refrigerant recovery operation/vacuuming operation is possible by applying setting
[2‑21]. Refer to "20.2 Making field
When vacuuming/recovery mode is used, check very carefully what should be
vacuumed/recovered before starting. See installation manual of the indoor unit for
more information about vacuuming and recovery.
1 When the unit is at standstill, set the unit in [2‑21]=1.
Result: When confirmed, the indoor and outdoor unit expansion valves will
fully open. At that moment the 7‑segment display indication=
interface of all indoor units indicate TEST (test operation) and
control) and the operation will be prohibited.
2 Evacuate the system with a vacuum pump.
3 Press BS3 to stop vacuuming mode.
This should be done with a refrigerant recovery unit. Follow the same procedure as
for vacuuming method.
C– C+
will be displayed on the user interface or on the
4
settings" [ 113] for details how to set mode 2.
and the user
(external
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VRV IV system air conditioner
4P543427-1A – 2020.10