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21 Maintenance and service
NOTICE
Applicable legislation on fluorinated greenhouse gases
requires that the refrigerant charge of the unit is indicated
both in weight and CO
2
Formula to calculate the quantity in CO
tonnes: GWP value of the refrigerant × total refrigerant
charge [in kg] / 1000
21.1
Maintenance safety precautions
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING/SCALDING
WARNING
Prior to start working on systems containing flammable
refrigerant, safety checks are necessary to ensure that the
risk of ignition is minimised. Therefore, some instructions
should be followed.
Please refer to the service manual for more information.
NOTICE: Risk of electrostatic discharge
Before performing any maintenance or service work, touch
a metal part of the unit in order to eliminate static electricity
and to protect the PCB.
21.1.1
To prevent electrical hazards
When performing service to inverter equipment:
1 Do NOT perform electrical work for 10 minutes after turning off
the power supply.
2 Measure the voltage between terminals on the terminal block
for power supply with a tester and confirm that the power supply
is shut off. In addition, measure points as shown in the figure,
with a tester and confirm that the voltage of the capacitor in the
main circuit is less than 50 V DC. If the voltage 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.
8 HP
a
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
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
switch box/service 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.
Installation and operation manual
46
equivalent.
equivalent
2
10-12 HP
a
will be displayed on the
21.2
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.
21.3
About service mode operation
Refrigerant recovery operation/vacuuming operation is possible by
applying setting [2‑21]. Refer to
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.
21.3.1
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
the operation will be prohibited.
2 Evacuate the system with a vacuum pump.
3 Press BS3 to stop vacuuming mode.
21.3.2
To recover refrigerant
This should be done with a refrigerant recovery unit. Follow the
same procedure as for vacuuming method.
DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage. If you want to pump
down the system, and there is a leak in the refrigerant
circuit:
▪ Do NOT use the unit's automatic pump down function,
with which you can collect all refrigerant from the
system into the outdoor unit. Possible consequence:
Self-combustion and explosion of the compressor
because of air going into the operating compressor.
▪ Use a separate recovery system so that the unit's
a
compressor does NOT have to operate.
NOTICE
Make sure to NOT recover any oil while recovering
refrigerant. Example: By using an oil separator.
21.3.3
Before the maintenance and service of a
system with SV unit
Before starting the maintenance and service, field setting
"[2‑45]" [ 4 42] must be applied on the outdoor unit. For more
information, see
"18.1.7 Mode 2: field
If field setting "[2‑45]" [ 4 42] is applied, the shut-off valves of the SV
unit will close. The compressor, outdoor fan and indoor unit will stop
operating and the 7-segment display will show code "
To confirm the full closure of the shut-off valves, "
on the 7-segment display of the outdoor unit .
The system power supply must be turned off for maintenance.
settings" [ 4 40] for
"18.1 Making field
(external control) and
settings" [ 4 42].
".
" will be shown
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752781-1B – 2024.02
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