DC Inverter Monoblock Duct Type Air Conditioner Installation and Operation Manual
11
Note:
①
The standard pipe length is 5m. When the length (L) of the connecting pipe is less than or
equals 7m, there is no need to add refrigerant. If the connecting pipe is longer than7m, it is
required to add refrigerant. In the above table, the amounts of refrigerant to be added for the
models are listed for each additional meter of pipe length.
②
The pipe wall thickness shall be 0.5-1.0 mm and the pipe wall shall be able to withstand the
pressure of 6.0 MPa.
③
The longer the connecting pipe, the lower the cooling effect and the heating effect.
2.2.9 Connection of Pipeline
(1) Align the flared end of the copper pipe with the center of the thread joint. Manually tighten the
flared end nut.
(2) Use torque spanner to tighten the flared end nut until the spanner clatters (Fig.12).
Fig.12
The following table describes the torques for tightening nuts of different pipe diameters.
Table 2
Pipe Diameter
Tightening Torque
3/8 (Inch)
35-40 (N·m)
5/8 (Inch)
60-65 (N·m)
(3) The bending angle of the fitting pipe shall not be too large, and otherwise the pipe may break.
Please use a bender when bending the fitting pipes.
(4) Use sponge to wrap the connecting pipe and joint, Then use plastic tape to bundle the sponge.
Oil applied(to reduce friction with the flare nut)
Oil applied
(improves seal air-tightness)
