Information About The Refrigerant; Safety Devices General Description; Table 1 - Physical Properties Of R32 Refrigerant - Daikin EWYT021CZI-A1 Installation And Maintenance Manual

1.3.

Information about the refrigerant

This product contains R32 refrigerant that has a minimal environmental impact, thanks to its low value of Global Warming
Potential (GWP). According to ISO 817, R32 refrigerant is classified as A2L, which is slightly flammable, since the flame
propagation rate is low, and nontoxic.
R32 refrigerant can burn slowly when all the following conditions are present:
▪
The concentration is between the lower and upper flammability limit (LFL & UFL)
▪
Wind velocity < propagation of flame velocity
▪
Energy of the ignition source > Minimum ignition energy
But pose no risk under the normal usage conditions for air conditioning equipment and work environment.
1.4.

Safety Devices General Description

The indoor unit is provided with a leak detection system and an integrated emergency fan.
The leak detector is embedded within the indoor unit and directly connected to the Unit's control device. In case of gas
leakage, the detector will automatically trigger the shut-down of the unit to prevent accidents. Furthermore, the emergency
fan will also be triggered and turned on in order to disperse the refrigerant.
This unit is equipped with electrically powered safety measures. For the safety measures to be
effective, the unit must be electrically powered at all times after installation, other than when
servicing.
Circulation airflow activated by a leak detection system
When the leak detection system is activated, the following actions take place and continue for at least 5 min after the
leak detection system has been reset:
•
energize the fan of the appliance to deliver indoor airflow at or above the minimum airflow Qmin (240 m
•
disable the compressor operation unless the compressor operation reduces the leak rate, or the total amount
released to the indoor space.
▪
Eventual machinery rooms or special machinery rooms shall be clearly marked as such on the entrances to the
room, together with warning notices indicating that unauthorized persons shall not enter and that smoking, naked
light or flames are prohibited. The notices shall also state that, in the event of an emergency, only authorized
persons conversant with emergency procedures shall decide whether to enter the machinery room. Additionally,
warning notices shall be displayed prohibiting unauthorized operation of the system
▪
The owner / operator shall keep an updated logbook of the refrigerating system.
Safety class (ISO 817)
PED Group
3
Practical limit (kg/m )
3
ATEL/ ODL (kg/m )
3
LFL (kg/m ) @ 60 °C
Vapor density @25 °C, 101.3 kPa (kg/m
Molecular mass
Boiling point (°C)
GWP (100 yr ITH)
GWP (ARS 100 yr ITH)
Autoignition temperature (°C)
Maximum surface temperature (°C)
Table 1 – Physical properties of R32 refrigerant
Threshold level
Alarm Shut down
5000ppm
A2L
1
0.061
0.30
0.307
3
) 2.13
52.0
-52
675
677
648
548
D-EIMHP01505-22_00EN 7/59
3
/h);