RXYQ8~18P7W1BR1
VRVIII System air conditioner
4PW44039-1E – 07.2010
Installation manual
24
Correcting after abnormal completion of the test operation
The test operation is only completed if there is no malfunction code
displayed on the remote controller. In case of a displayed malfunction
code, perform the following actions to correct the abnormality:
■
Confirm the malfunction code on the remote controller
■
After correcting the abnormality, press the
button
and reset the malfunction code.
■
Carry out the test operation again and confirm that the
abnormality is properly corrected.
13. S
ERVICE
MODE
OPERATION
Vacuuming method
At the first installation, this vacuuming is not required. It is required
only for repair purposes.
1
When the unit is at standstill and under the setting mode 2, set
the required function B (refrigerant recovery operation/
vacuuming operation) to
(ON).
-
After this is set, do not reset the setting mode 2 until the
vacuuming is finished.
-
The H1P LED is on and the remote controller indicates
(test operation) and
(external control) and the
operation will be prohibited.
2
Evacuate the system with a vacuum pump.
3
Press the
button and reset the setting mode 2.
Refrigerant recovery operation method
by a refrigerant reclaimer
1
When the unit is at standstill and under the setting mode 2, set
the required function B (refrigerant recovery operation/
vacuuming operation) to
(ON).
-
The indoor unit and the outdoor unit expansion valves will
fully open and some solenoid valves will be turned on.
-
The H1P LED is on and the remote controller indicates
(test operation) and
(external control) and the
operation will be prohibited.
2
Cut off the power supply to the indoor units and the outdoor unit
with the circuit breaker. After the power supply to one side is cut
off, cut off the power supply to the other side within 10 minutes.
Otherwise, the communication between the indoor and outdoor
unit may become abnormal and the expansion valves will be
completely closed again.
3
Recover the refrigerant by a refrigerant reclaimer. For details,
see the operation manual delivered with the refrigerant
reclaimer.
14. C
AUTION
FOR
REFRIGERANT
LEAKS
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.
Maximum concentration level
The maximum charge of refrigerant and the calculation of the
maximum concentration of refrigerant is directly related to the
humanly occupied space in to which it could leak.
The unit of measurement of the concentration is kg/m
3
(the weight in
kg of the refrigerant gas in 1 m
3
volume of the occupied space).
Compliance to the local applicable regulations and standards for the
maximum allowable concentration level is required.
According to the appropriate European Standard, the maximum
allowed concentration level of refrigerant to a humanly space for
R410A is limited to 0.44 kg/m
3
.
Pay special attention to places, such as a basements, etc. where
refrigerant can stay, since refrigerant is heavier than air.
Procedure for checking maximum concentration
Check the maximum concentration level in accordance with steps 1
to 4 below and take whatever action is necessary to comply.
1
Calculate the amount of refrigerant (kg) charged to each system
separately.
Installation error
Error code
Remedial action
The stop valve of the
outdoor unit is left
closed.
E3
E4
F3
UF
Check referring to the table in
"11.4. Additional refrigerant
charge"
The phases of the
power to the outdoor
unit is reversed.
U1
Exchange two of the three phases
(L1, L2, L3) to make a positive
phase connection.
No power is supplied
to the outdoor or an
indoor unit (including
phase interruption).
U1
U4
Check if the power wiring for the
outdoor unit is connected correctly.
(If the power wire is not connected
to L2 phase, no malfunction display
will appear and the compressor will
not work.)
Incorrect
interconnections
between units
UF
Check if the refrigerant line piping
and the unit wiring are consistent
with each other.
Refrigerant
overcharge
E3
F6
UF
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.
Insufficient refrigerant
E4
F3
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.
BS3 RETURN
ON
BS1 MODE
ON
1
BP unit
2
direction of the refrigerant flow
3
room where refrigerant leak has occurred (outflow of all the
refrigerant from the system)
amount of
refrigerant in a
single unit system
(amount of
refrigerant with
which the system
is charged before
leaving the factory)
+
additional charging
amount (amount of
refrigerant added
locally in
accordance with
the length or
diameter of the
refrigerant piping)
=
total amount of
refrigerant (kg) in
the system
3
2
1
