10T8Y1B
VRV-W IV System Air Conditioner
4P399208-1 – 2015.01
Installation and operation manual
41
18.1.2 Test operation
The procedure below describes the test operation of the complete
system. This operation checks and judges following items:
Check of wrong wiring (communication check with indoor units).
Check of the stop valves opening.
Judgement of piping length.
Check of refrigerant charge.
On top of this system test operation, indoor units operation should
also be checked separately.
Make sure to carry out the system test operation after the first
installation. Otherwise, the malfunction code
U3
will be displayed
on the user interface and normal operation or individual indoor
unit test run cannot be carried out.
Abnormalities on indoor units cannot be checked for each unit
separately. After the test operation is finished, check the indoor
units one by one by performing a normal operation using the
user interface. Refer to the indoor unit installation manual for
more details concerning the individual test run.
Procedure
1
Close all front panels (incl. electrical component box) during the
test run, in order not to let it be the cause of misjudgment.
2
Make sure all field settings you want are set; see
.
3
Turn ON the power to the outdoor unit and the connected indoor
units.
4
Make sure that the pump motor is operating.
5
Make sure that the appropriate stop valves are open.
Heat pump system: HP/LP gas and liquid
Heat recovery system: suction gas, HP/LP gas, liquid
6
Make sure the default (idle) situation is existing. Set to setting
mode 1 (H1P= off). Push BS4 for 5 seconds or more. The unit
will start test operation.
The test operation is automatically carried out, the outdoor
unit H2P flashes and the indication "Test operation" and
"Under centralized control" will display on the user interface
of indoor units.
During the test operation, it is not possible to stop the unit
operation from a user interface. To abort the operation, press
BS3. The unit will stop after ±1 minute (max. 10 minutes).
7
Check the test operation results on the outdoor unit LED
indication.
- Normal completion:
xxwxxxx
- Abnormal completion:
xwwxxxx
Refer to
"18.1.3 Correcting after abnormal completion of the
to take actions for correcting the
abnormality. When the test operation is fully completed,
normal operation will be possible after 5 minutes.
18.1.3 Correcting after abnormal completion of the test
operation
The test operation is only completed if there is no malfunction code
displayed on the user interface. In case of a displayed malfunction
code, perform correcting actions as explained in the malfunction code
table. Carry out the test operation again and confirm that the
abnormality is properly corrected.
18.2. Malfunction code list
In case of a displayed malfunction code, perform correcting actions
as explained in the malfunction code table.
After correcting the abnormality, retry operation.
Below table gives an overview of the malfunction codes which may
appear.
Remote controller displays malfunction code
INFORMATION
The test operation can take up to 30 minutes. The test
operation is carried out in cooling mode.
INFORMATION
It may take 10 minutes to achieve a uniform
refrigerant state before the compressor starts.
During the test operation, the refrigerant running
sound or the magnetic sound of a solenoid valve may
become loud and the display indication may change.
These are not malfunctions.
NOTICE
Be sure to turn on the power 6 hours before operation in
order to have power running to the crankcase heater and
to protect the compressor.
INFORMATION
Refer to the installation manual of the indoor unit for other
detailed malfunction codes related to indoor units.
Malfunction
code
Error
Corrective action
E3
E4
F3
F6
UF
U2
The stop valve of an outdoor
unit is left closed.
Open the stop valve.
U1
The phases of the power to
the outdoor units are
reversed.
Exchange two of the three
phases (L1, L2, L3) to make
a positive phase connection.
U3
The test operation is not
completed.
Complete the test operation.
U1
U2
U4
No power is supplied to an
outdoor or indoor unit
(including phase
interruption).
Check if the power wiring for
the outdoor units are
connected correctly.
(If the power wire is not
connected to L2 phase, no
malfunction display will
appear and the compressor
will not work.)
UF
Incorrect transmission
between units
Check if the refrigerant
piping line and the unit
transmission wiring are
consistent with each other.
E3
F6
UF
U2
Refrigerant overcharge
Recalculate the required
amount of refrigerant from
the piping length and correct
the refrigerant charge level
by recovering any excessive
refrigerant with a refrigerant
recovery machine.
E4
F3
Insufficient refrigerant
• Check if the additional
refrigerant charge has
been finished correctly.
• Recalculate the required
amount of refrigerant from
the piping length and add
an adequate amount of
refrigerant.
U7
UF
If a multi outdoor unit
terminal is connected when
only one outdoor unit
installed.
Remove the wire from the
multi outdoor unit terminal
(Q1 and Q2).
UF
E4
The operation mode on the
remote controller was
changed before the check
operation.
Set the operation mode on
all indoor unit remote
controllers to "cooling".
HJ
The heat source water is not
circulating.
Make sure that the water
pump is running.
E2
E3
E2 or E3 is activated, and
pressing the On/Off button
on the remote controller does
not turn off E2 or E3.
In this case, there is a
malfunction of the
compressor in the outdoor
unit.
Measure the insulation
resistance of the compressor
to check the condition of the
compressor.
