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Installation manual
26
RXYSQ4~Y1B
VRVIII-S System air conditioner
4PW68122-1 – 02.2011
13. C
AUTION
FOR
REFRIGERANT
LEAKS
(Points to note in connection with refrigerant leaks.)
13.1. 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.
13.2. 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
.
For Sky Air or room air conditioner indoor units only:
For VRV indoor units only:
Pay special attention to places, such as a basements, etc. where
refrigerant can stay, since refrigerant is heavier than air.
13.3. 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.
2
Calculate the smallest room volume (m
3
)
In a case such as the following, calculate the volume of (A), (B)
as a single room or as the smallest room.
For Sky Air or room air conditioner indoor units only:
1
direction of the refrigerant flow
2
room where refrigerant leak has occurred (outflow of all the
refrigerant from the system)
3
BP unit
1
direction of the refrigerant flow
2
room where refrigerant leak has occurred (outflow of all the
refrigerant from the system)
2
1
3
2
1
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.
A.
Where there are no smaller room divisions
1
BP unit
B.
Where there is a room division but there is an
opening between the rooms sufficiently large to
permit a free flow of air back and forth.
1
opening between rooms
2
partition
(Where there is an opening without a door or where there
are openings above and below the door which are each
equivalent in size to 0.15% or more of the floor area.)
3
BP unit
1
1
2
3