Installation manual
17
250B8W1B
Split system air conditioner
4PW25544-1A
10. 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 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 the operation will be prohibited.
2
Cut off the power supply to the indoor units that have separate
power supply 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.
11. C
AUTION
FOR
REFRIGERANT
LEAKS
(Points to note in connection with 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.
The 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.
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.
When a unit is installed in a small room, it is necessary to
take measures so that the leaked refrigerant amount does
not exceed the limit even if it leaks. As for the measures to
prevent the leak from not exceeding the limit, please
consult with your distributor.
If the leaked amount exceeds the limit, it may cause an
oxygen deficiency accident.
ON
BS1 MODE
ON
1
direction of the refrigerant flow
2
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
NOTE
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.
2
1
