Installation procedure
Outdoor unit
Adding refrigerant
Refrigrant must be added in liquid state. 
Refrigerant bottle swith or without a siphon tube can be refilled with refrigerant upright or upside down,Respectively.
Containers for R22 refrigerant must be marked with R22
R22 refrigerant cannot share the same instrument distributor and filling pipes.
Refrigerant charge
After finished vacuum the system,charge the vacuum to the refrigerant pump,chargeing the refrigerant.
Calculation of the refrigerant charge
Note:when unit shipping out of the factory,charge the refrigerant not including the connstruction procedure charged parts.
The calculation of the refrigerant charging:
When the connection pipe(L)<=5 meters, not need to add refrigerant;If the connection pipe (L)> 5 meters,we need recharge the 60g 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.
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