Specifications

Installation and operation manual
46
RXYQQ8~20T7Y1B
VRV IV System Air Conditioner
4P345099-1 – 2013.04
16. Operation of the unit
Once the unit is installed and test operation of outdoor unit and
indoor units is finished, the operation of the system can start.
For operating the indoor unit, the user interface of the indoor unit
should be switched ON. Refer to the indoor unit operation manual for
more details.
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
Information code
Contents SolutionMain code
Auto charging related
P2 Unusual low pressure on suction line Close valve A immediately. Push
BS3 to reset. Check
following items before retrying autocharge procedure:
• Check if the gas side stop valve is opened correctly.
• Check if the valve of the refrigerant cylinder is opened.
• Check if the air inlet and outlet of the indoor unit are not
obstructed.
P8 Freeze-up prevention indoor unit Close valve A immediately. Push
BS3 to reset. Retry
autocharge procedure.
PE Automatic charging nearly finished Prepare for autocharge stopping
P9 Automatic charging finished Finish autocharge mode
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
RXYQQ14~20
RXYQQ8~12
X6A (A6P) X5A (A3P)
X3A