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RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV System Air Conditioner
4P329765-1 – 2012.09
Installation and operation manual
48
17. Maintenance and service
17.1. Maintenance introduction
In order to ensure optimal operation of the unit, a number of checks
and inspections should be carried out on the unit at regular intervals,
preferably yearly.
This maintenance shall be carried out by the installer or service
agent.
17.2. Service precautions
17.3. Service mode operation
Refrigerant recovery operation/vacuuming operation is possible by
applying setting [2-21]. Refer to
"13.2. Operating the push buttons
and DIP switches on the logic board" on page 30
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.
17.3.1. Vacuuming method
1
When the unit is at standstill, set the unit in [2-21]=1.
2
When confirmed, the indoor and outdoor unit expansion valves
will fully open.
At that moment the segment display indication=
t.01
and the user
interface of all indoor units indicate TEST (test operation) and
(external control) and the operation will be prohibited.
3
Evacuate the system with a vacuum pump.
4
Press BS3 to stop vacuuming mode.
17.3.2. Refrigerant recovery operation method
This should be done by a refrigerant reclaimer. Follow the same
procedure as for vacuuming method.
18. Caution for refrigerant leaks
18.1. Introduction
The installer and system specialist shall secure safety against
leakage according to local regulations or standards. The following
standards may be applicable if local regulations are not available.
This system uses R410A as refrigerant. R410A itself is an entirely
safe non-toxic, non-combustible refrigerant. Nevertheless care must
be taken to ensure that air conditioning facilities are installed in a
room which is sufficiently large. This assures that the maximum
concentration level of refrigerant gas is not exceeded, in the unlikely
event of major leak in the system and this in accordance to the local
applicable regulations and standards.
DANGER: Electrical shock
See
"2. General safety precautions" on page 2
.
CAUTION
When performing service to inverter equipment:
1
Do not open the electrical component box cover for 10
minutes after the power supply is turned off.
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
below, with a tester and confirm that the voltage of the
capacitor in the main circuit is less than 50 V DC.
3
To prevent damaging the PC-board, 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
E7
will be displayed on the user interface or on the
outdoor unit 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.
BLK
RED
R(X/Y)(Y/M)Q14~20
R(X/Y)(Y/M)Q8~12
X6A (A6P)
X5A (A3P)
X3A
NOTICE
Play it safe. For protection of the PCB, touch the switch
box casing by hand in order to eliminate static electricity
from your body before performing service.
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