SiEN34-705
Heat Pump 60Hz (RXYQ5~54P)
Installation Manual
307
2.14 Caution 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 VRV System, like other air conditioning systems, uses R-410A as refrigerant. R-410A 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
1m3 volume of the occupied space).
Compliance to the local applicable regulations and standards for the maximum allowable
concentration level is required.
In Australia the maximum allowed concentration level of refrigerant to a humanly space is
limited to 0.35kg/m
3
for R-407C and 0.44kg/m
3
for R-410A.
Pay a special attention to the place, such as a basement, 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.
Note:
!
Where a single refrigerant facility is divided into 2 entirely independent refrigerant systems
then use the amount of refrigerant with which each separate system is charged.
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
direction of the refrigerant flow room where refrigerant leak
has occurred (outflow of all
the refrigerant from the
system)
