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Installation of the outdoor unit
1.Calculation of refrigerant density
Calculation will be made according to the following methods:
1) Total refrigerant content of each system (kg) =content of 1 outdoor system + refilled refrigerant
Content of 1 outdoor system:Factory filled refrigerant
Refilled refrigerant:Filled content during installation according to the diameter and length of the
liquid piping.
2) Calculation of the minimum room sapce (m
3) Calculation of refrigerant density
Total refrigerant content
Minimum room space
2.Preventive measures against excess of critical value
1) Make ventilation holes
Ventilation holes should be built above and under the door.The area of each hole should not be smaller
than 0.15% of the room space.Holes can be made directly in the wall.
2) Reduce the filling content of refrigerant
Filling content of refrigerant can be reduced by shortening the distance between the indoor and out-
door units.
By reducing the capacity of the outdoor unit.
When outdoor unit be made up of several units.the outdoor capacity of each system should reduce.So
the refrigerant content of system reduce.
3) Install ventilation fans.
Users can install uninterrupted ventilation fans to keep the refrigerant density under the critical value.
If uninterrupted ventilation is impossible,a combined fanning and alarming device should be installed
in its stead (through which immediate ventilation is possible when leak occurs).
(See the figure below)
).
3
Refrigerant density:0.3(kg/m
An example
Ventilation fan and gas leak alariming device
The gas leak alarming
device should be installed
at refrigerant gas
stagnation areas
)
3
Vertilation opening
20
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