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After finished vacuum the system, change the vacuum to the refrigerant pump, charging the refrigerant.
8. Refrigerant charge
When the outdoor valve is shut, fill the refrigerant from the access hole at the gas and liquid sides.
If the required filling is impossible, open all the gas and liquid valves, then slightly shut the gas valve, run the compressor
and fill the refrigerant from the access hole at the gas side. Now adjust the gas valve to control the refrigerant flow, which
will be gasified during absorption by the system.
If there is insufficient refrigerant in the system caused by leaks, refill it after the remaining refrigerant is recollected.
Open all the valves of the outdoor unit.
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
By shortening the distance between the indoor and outdoor units, filling content
of refrigerant can be reduced.
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 Right)
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
).
(3)Calculation of refrigerant density
Refrigerant density: 0.3(kg/m
3
)
An example
Ventilation fan and gas leak alariming device
Vertilation opening
The gas leak alarming
device should be
installed at refrigerant
gas stagnation areas
Installation Precedure
24
Refill refrigerant
Open all valves
Separate isolation should be made for the liquid and gas pipes.
Materials used for the pipe isolation at the gas side must withstand above 120 C temperature.
Heat isolation of the pipes
When the unit ships out of the factory, charge the refrigerant not including the construction procedure charged parts.
The calculation of the refrigerant charging:
When the connection pipe (L) <=5 meters, not need to add refrigerant ;
When the connection pipe (L) >5 meters, we need recharge the 100g refrigerant per add 1 meter.
That is, the quantity of refrigerant charging=(L-5)¡`100(g)
Calculation of the the refrigerant charge
Total refrigerant content
Minimum room space
Outdoor Unit