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4.2.3 Safety measures to prevent
refrigerant leaks
Safety measures to prevent refrigerant leak
The installation personnel must make sure the safety
measures to prevent leaks comply with local
regulations or standards. If the local regulations do not
apply, the following criteria can be applied.
The system uses R410A as the refrigerant. R410A
itself is a completely non-toxic, and non-combustible
refrigerant.
However,
do
ensure
conditioning unit is installed in a room with sufficient
space. This is so that when there is a serious leak in
the system, the maximum concentration of the
refrigerant gas in the room will not exceed the
stipulated concentration, and is consistent with the
relevant local regulations and standards.
About the maximum concentration level
The calculation for the maximum concentration of the
refrigerant is directly related to the occupied space that
the refrigerant may leak to and the refrigerant's level of
charge.
The measurement unit for concentration is kg/m3
(weight of gaseous refrigerant that has a volume of 1
m3 in the occupied space).
The highest permissible concentration must comply
with the relevant local regulations and standards.
Based on the applicable European standards, the
maximum permissible concentration level of R410A in
the space occupied by humans is limited to 0.44 kg/m
If this limit is exceeded, necessary measures shall be
taken. Please confirm as follows:
a. Calculate the total refrigerant charging amount.
Total refrigerant charging amount = refrigerant
charging amount of the unit itself + charging amount
calculated according to the pipe length.
b. Calculate the indoor volume (based on the minimum
volume).
c. Calculated refrigerant concentration = (total
charging amount/indoor volume).
Outdoor Unit
Indoor
Unit
Room with refrigerant
leakage (all refrigerant leaks)
Airflow
Airflow
Countermeasures when exceeding the max concentration
a. Please install a mechanical ventilation device.
b. If it is impossible to change air frequently, please install
a leak detection alarm device connected with the
mechanical ventilation device.
4.3 Selecting and Preparing
that
the
air
4.3.1 Refrigerant piping requirements
.
3
Figure 4.5
19
Figure 4.4
the Refrigerant Piping
NOTE
The R410A refrigerant pipeline system must be
kept strictly clean, dry and sealed.
Cleaning and drying: prevent foreign objects
(including mineral oil or water) from mixing
into the system.
Seal: R410A does not contain fluorine, does
not destroy the ozone layer, and does not
deplete the ozone layer that protects the
earth from harmful ultraviolet radiation. But if
it is released, R410A can also cause a slight
greenhouse effect. Therefore, you must pay
special attention when you check the sealing
quality of the installation.
The piping and other pressure vessels must
comply with the applicable laws and be
suitable for use with the refrigerant. Use only
phosphoric acid deoxidized seamless copper
for the refrigerant piping.
Foreign objects in the pipes (including lubricant used
during pipe bending) must be ≤ 30 mg/10m.
Calculate all piping lengths and distances.
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