Installation Precedure
Outdoor Unit
8. Refrigerant charge
After finished vacuum the system, change the vacuum to the refrigerant pump, charging the refrigerant.
Calculation of the the refrigerant charge
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
Refill refrigerant
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 valves
Open all the valves of the outdoor unit.
Heat isolation of the pipes
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.
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 (m3).
(3)Calculation of refrigerant density
Total refrigerant content | Refrigerant density: 0.3(kg/m3) | |
Minimum room space | ||
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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)
Ventilation fan and gas leak alariming device
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The gas leak alarming | Vertilation |
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device should be |
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installed at refrigerant |
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gas stagnation areas |
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An example |
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