Gree R410A Manual page 52

Photovoltaic Direct-driven VRF
for North America
1) Thermal insulating material shall be able bear the pipe temperature. For heat pump unit, liquid pipe
o
should bear 70 C(158
unit, both liquid pipe and gas pipe should bear 70
2) Thermal insulating material of branches should be the same as that of the pipeline. The attached foam of
branches cannot be taken as insulating material.
7.1.6 Support and Protection of Pipeline
1) Support should be made for hanging connection pipe. Distance between each support cannot be over
1m(3-1/4feet).
2) Protection against accidental damage should be made for outdoor pipeline. When pipeline exceeds
1m(3-1/4feet), a pinch board should be added for protection.
7.2 Disassembly of Compressor Feet
factory.
When installing the unit, metal pieces for transportation must be removed. Then fasten the binding nuts again and wrap back
7.3 Vacuum Pumping, Refrigerant Adding
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation! There is no extra refrigerant in the outdoor unit
for air purging!
7.3.1Vacuum Pumping
1) Outdoor unit has been charged with refrigerant before delivery. Field-installed connection pipe needs to be charged with additional
refrigerant.
2)
3) Use vacuum pump to withdraw the air inside indoor unit and connection pipe from the outdoor valve, as shown below.
50
o
F) or above and gas pipe should bear 120
Binding nut
Metal pieces
Fasten the nut after removal
o o
C(248 F) or above. For cooling only
o o
C(158 F) or above.
Compressor
Metal pieces
s operating life will be shortened.