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Si39-406 Refrigerant Piping
Installation Manual REYQ96MTJU 169
9. 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 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 lb/ft
3
( the weight in Ib. of the refrigerant gas in 1ft
3
volume of the occupied space).
Compliance to the local applicable regulations and standards for the maximum allowable
concentration level is required.
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 (Ib.) charged to each system separately.
2
1
1. direction of the refrigerant flow
2. room where refrigerant leak has occurred
(outflow of all the refrigerant from the system)
amount of refriger-
ant 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 refrig-
erant piping)
=
total amount
of refriger-
ant (Ib.) in
the system