24
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Maintenance and service
Installer and user reference guide
158
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
measured is still higher than 50 V DC, discharge the capacitors in a safe
manner by using a dedicated capacitor discharge pen to avoid possibility of
sparking.
X3A
5~12 HP
14~20 HP
3
Pull out junction connectors X1A, X2A 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 electrical shock.)
4
After the service is finished, plug the junction connector back in. Otherwise
the malfunction code
will be displayed on the user interface or on the
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.
24.2 Checklist for yearly maintenance of the outdoor unit
Check the following at least once a year:
▪
Heat exchanger
The heat exchanger of the outdoor unit can get blocked up due to dust, dirt,
leaves, etc. It is recommended to clean the heat exchanger yearly. A blocked
heat exchanger can lead to too low pressure or too high pressure leading to
worse performance.
24.3 About service mode operation
Refrigerant recovery operation/vacuuming operation is possible by applying setting
[2‑21]. Refer to
128] for details how to set mode 2.
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.
24.3.1 To use vacuum mode
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=
and the user
interface of all indoor units indicate TEST (test operation) and
(external
control) and the operation will be prohibited.
2
Evacuate the system with a vacuum pump.
