Heat Recovery DC Inverter Multi VRF Unit
23
Figure 25
Y-type branch
Total capacity of downstream indoor
unit(s) (X)
Model
X
≤
200
FQ01A/A
200
＜
X
≤
300
FQ01B/A
300
＜
X
≤
700
FQ02/A
700
＜
X
≤
1350
FQ03/A
1350
＜
X
FQ04/A
（
4
）
Branch shall be insulated by insulating material that can bear 120° or even higher temperature.
The attached foam of branch cannot be taken as insulating material.
4.3.3 Thermal insulation for pipeline
（
1
）
For multi VRF system, every copper pipe should be labeled so as to avoid misconnection.
（
2
）
At the branch inlet, leave at least 500mm straight pipe section. For FQ04 branch, leave at least
800mm straight pipe section.
（
3
）
Thermal insulation for pipeline
1
）
To avoid condensate or water leak on the connection pipe, the gas pipe and liquid pipe must
be wrapped with thermal insulating material and tied by adhesive tape.
2
）
Thermal insulating material shall be able to bear the pipe temperature: For heat pump unit,
liquid pipe should bear 70
℃
or above and gas pipe should bear 120
℃
or above. For cooling
only unit, both liquid pipe and gas pipe should bear 70
℃
or above. Example: Polyethylene
foam (bear 120
℃
or above); foaming polyethylene (bear 100
℃
or above)
3
）
Wrap joints of indoor/outdoor units with insulating materials. There must be no gap between
the joint and the wall of indoor/outdoor unit, as shown in figure 32.