RXYSQ6P8Y1B9
VRVIII-S System air conditioner
4P357505-1 – 2013.08
Installation manual
21
13. Service mode operation
After turning on the power supply, the unit can not be started until the
H2P initialisation led, indicating that the unit is still under preparation,
goes off (maximum 12 minutes).
Vacuuming method
At the first installation, this vacuuming is not required. It is required
only for repair purposes.
1
When the unit is at a standstill and under the setting mode 2, set
the required function B (refrigerant recovery operation/
vacuuming operation) to
ON
(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
(test operation) and
(external control) and the
operation will be prohibited.
2
Vacuum the system with a vacuum pump.
3
Press the
BS1 MODE
button and reset the setting mode 2.
Refrigerant recovery operation method by a refrigerant
reclaimer.
1
When the unit is at a standstill and in setting mode 2, set the
required function B (refrigerant recovery operation/vacuuming
operation) to
ON
(ON).
- The indoor unit and the outdoor unit expansion valves will
fully open and some solenoid valves will open.
- The H1P led is on and the remote controller indicates
TEST
(test operation) and
(external control) and the
operation will be prohibited.
2
Recover the refrigerant using a refrigerant reclaimer. For details,
see the operation manual delivered with the refrigerant
reclaimer.
3
Press the
BS1 MODE
button and reset the setting mode 2.
14. Caution for refrigerant leaks
(Points to note in connection with refrigerant leaks.)
14.1. 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 unit, like other air conditioning systems, 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.
14.2.
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
.
1
direction of the refrigerant flow
2
room where refrigerant leak has occurred (outflow of all the
refrigerant from the system)
Pay special attention to places, such as a basements, etc. where
refrigerant can stay, since refrigerant is heavier than air.
14.3.
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.
Cautions for normal operation check
Once stopping, the compressor will not restart in
about 5 minutes even if the Run/Stop button of an
indoor unit in the same system is pressed.
When the system operation is stopped by the remote
controller, the outdoor units may continue operating
for a further 1 minute maximum.
After the test run, when handling the unit over to the
customer, make sure the electric box lid, the service lid and
the unit casing are all attached properly.
CAUTION
Never turn the power of the outdoor unit OFF while the
refrigerant is being recovered.
If the power is turned OFF, the solenoid valves are closed
and the refrigerant cannot be recovered from the outdoor
unit.
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
NOTICE
Where a single refrigerant facility is divided into 2 entirely
independent refrigerant systems, use the amount of
refrigerant with which each separate system is charged.
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4P357505-1.book Page 21 Tuesday, September 10, 2013 7:59 AM
