Securing Safety Against Refrigerant Leaks - Daikin RXYSQ4T8VB Series Installer And User Reference Manual

17 | Unit installation

17.1.3 Securing safety against refrigerant leaks

About safety against refrigerant leaks
About the maximum concentration level
To check the maximum concentration level
Installer and user reference guide
60
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 system uses R410A as refrigerant. R410A itself is an entirely safe non-toxic,
non-combustible refrigerant. Nevertheless care must be taken to ensure that the
system is 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.
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
refrigerant gas in 1 m 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
3
0.44 kg/m .
a Direction of the refrigerant flow
b Room where refrigerant leak has occurred (outflow of all the refrigerant from the
system)
Pay special attention to places, such as basements etc., where refrigerant can stay,
since refrigerant is heavier than air.
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.
Formula
A
B
C
a
b
A+B=C
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)
Total amount of refrigerant (kg) in the system
3
(the weight in kg of the
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10