Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document.
Note: Even the most advanced machine translation cannot match the quality of professional translators.
Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Notices for Laying Pipes
- When connecting the indoor and outdoor units, you are advised to weld pipes to the outdoor unit first. Seal the pipe after welding if the welding break exceeds 15 minutes to prevent dust and moisture from entering the pipe.
- Take protective measures, such as spreading a piece of wet cloth, around the welding position, to avoid burning the bottom panel, top panel, side panel, internal components, needle valves, other pipes, thermal insulation foam, power cables, labels, and tags.
- During the welding, avoid exposing the refrigerant pipes for over 15 minutes. Otherwise, system reliability is affected.
- To avoid leakage of ventilation channels and damage to copper pipes, seal the holes after the pipes are routed through the bottom panel. Seal the top of the copper pipes to prevent foreign matter from entering the refrigerant pipes.
- After welding copper pipes that are excessively long or with bends, blow nitrogen into the pipes to clean foreign matter so that other components will not be affected.
- Wrap the refrigerant pipes with thermal insulation foam.
- Avoid elbows and ensure that the connection between the indoor and outdoor units is the shortest.
When selecting the refrigerant pipes, note the following:
- Avoid elbows and ensure that the connection between the indoor and outdoor units is the shortest.
- After determining the best pipe route between the indoor and outdoor units, calculate the number of the components that cause local resistance loss, for example, elbows, and convert them into the equivalent length to straight pipes.
- The total length of pipes connecting the indoor and outdoor units equals to the equivalent length of the straight pipes plus the length of the straight pipes connecting the indoor and outdoor units.
- You are advised to select the pipes based on the total length of the pipes connecting the indoor unit and outdoor unit, because different pipe diameters influence the voltage drop and performance of the cooling system.
- The maximum pipe length mentioned in this document is the equivalent length.
Table 4-11 Equivalent length of components
Copper Pipe Outer Diameter (in.) |
45° Bend (Unit: m) |
90° Bend (Unit: m) |
180° Bend (Unit: m) |
T-shaped 3-Way Valve (Unit: m) |
|---|---|---|---|---|
3/8 |
0.12 |
0.2 |
0.4 |
0.6 |
1/2 |
0.14 |
0.25 |
0.5 |
0.65 |
5/8 |
0.17 |
0.3 |
0.6 |
0.7 |
3/4 |
0.2 |
0.35 |
0.7 |
0.8 |
7/8 |
0.24 |
0.42 |
0.8 |
1.2 |
1 |
0.28 |
0.5 |
1 |
1.3 |
1-1/8 |
0.32 |
0.6 |
1.2 |
1.4 |
To dampen noises generated by the equipment due to vibration, refrigerant pipe supports should be installed as required by Figure 4-60.
- When the direction of the refrigerant pipe changes, add a support at the position that is 500 mm away from the changing point.
- If the refrigerant pipe is straight, add a support every 1500 mm.
Onsite personnel are responsible for preparing the required materials and installing the supports.