Additional Installation Site Requirements Of The Outdoor Unit In Cold Climates; Securing Safety Against Refrigerant Leaks - Daikin LRMEQ3AY1 Installer And User Reference Manual

5 Preparation
a Make sure there is enough installation space
Set the air outlet side at a right angle to the direction of the wind.
a
a
a Prevailing wind direction
b Air outlet
5.2.2 Additional installation site requirements
of the outdoor unit in cold climates
Protect the outdoor unit against direct snowfall and take care that the
outdoor unit is NEVER snowed up.
c
a Snow cover or shed
b Pedestal (minimum height = 150 mm)
c Prevailing wind direction
d Air outlet
5.2.3

Securing safety against refrigerant leaks

About safety against refrigerant leaks
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.
Installer and user reference guide
10
a
c
b
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.
About the 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
kg of the 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
3
R410A is limited to 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.
To check the maximum concentration level
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 Amount of refrigerant in a single unit system
(amount of refrigerant with which the system
is charged before leaving the factory)
B Additional charging amount (amount of
refrigerant added locally)
C Total amount of refrigerant (kg) in the
system
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
installed. In a case such as the following, calculate the volume
of (D), (E) as a single room or as the smallest room.
D Where there are no smaller room divisions:
3
(the weight in
a b
3
) where the indoor unit is
LRMEQ3+4AY1
Air-cooled refrigeration condensing unit
4P442131-1 – 2016.03