Daikin VRV IV+ Installer And User Reference Manual page 29

To check the maximum concentration level
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10
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
NOTICE
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.
2 Calculate the volume of the room (m
case such as the following, calculate the volume of (D), (E) as a single room or
as the smallest room.
D When there are no smaller room divisions:
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
) where the indoor unit is installed. In a
5 Preparation
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Installer and user reference guide
29