Daikin RWEYQ72, Engineeiring Data

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Installation EDUS30-900-N
48 Installation of Outdoor Units
12. CAUTION FOR REFRIGERANT LEAKS
(Points to note in connection with refrigerant leaks)
Introduction
DANGER
Refrigerant gas is heavier than air and replaces oxygen. A massive leak could lead to oxygen depletion, especially in basements, and an
asphyxiation hazard could occur leading to serious injury or death.
The installer and system specialist shall secure safety against leakage according to local regulations or standards. The following stan-
dards may be applicable if local regulations are not available.
The VRV System, like other air conditioning systems, uses R-410A as refrigerant. R-410A is an entirely safe non-toxic, non-com-
bustible refrigerant. Nevertheless care must be taken to ensure that air conditioning facilities are installed in a room that is suffi-
ciently 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 lb of the refrigerant gas in 1 ft
3
volume of the occupied space).
Compliance to the local applicable regulations and standards for the maximum allowable concentration level is required.
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 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 (lb) 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.
•
Follow local code requirements (ASHRAE-15 2007 & ASHRAE-34 2007).
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 refrigerant
(lb) in the
system
2
1