Refrigerant Connections - Carrier 50CJ Serie Installations-, Betriebs- Und Wartungsanleitung

27 - REFRIGERANT CONNECTIONS

Once the outdoor and indoor units have been installed, the refrigerant connections must be made to link the units. When doing this, apply
the installation standards and carefully study the pipe diagram, ensuring the shortest distance and the smallest number of elbows. Likewise,
avoid restrictions by ensuring the curves on the elbows are as shallow as possible (curve radius greater than 3.5 x Ø).
Maximum height 30 m
Maximum equivalent length 50 m
To calculate the equivalent length, take into account the accessories pressure drops.
Equivalent elbow lengths at 90º:
Pipe diameter (inches)
Equivalent length (m)
■ Preparing the pipes
For refrigerant pipes, only use refrigeration grade copper tubes (Cu-DHP type in accordance with standard ISO 1337), insulated,
degreased and deoxidised, suitable for an operating pressure of at least 4200 kPa and minimum burst pressure of 20,700 kPa. Domestic
water type copper pipes must never be used.
- Smooth the ends of the pipes by inclining them downwards. Make sure there is no contamination inside the pipes.
- Remove the flare nuts from the unit and place them on the pipe. Flare the ends of the pipes. Characteristics of a properly flared
pipe:
• Smooth, polished inner surface.
• Polished, even outer edges.
• Conical flare, uniform length.
- Insulate the two pipes.
■ Connecting the units
- Connect the two units.
For the CL2, tighten the flare unions using two wrenches.
If these two wrenches are not used, there is a risk of breakage, which will void the warranty.
- Tighten the pipes to the correct torque given in the table below. An insufficient tightening torque may result in gas leaks, while an
excessive torque may damage the pipe flare and allow gas to escape.
Pipe diameter
mm inch
9,52 3/8"
12,70 1/2"
15,87 5/8"
19,05 3/4"
22,22 7/8"
72
3/8" 1/2"
0,35 0,45
Minimum pipe thickness
mm
0,80
0,80
0,89
1,00
1,20
Maximum height 30 m
Maximum equivalent length 50 m
5/8"
0,55
Tightening torque
Nm
30
40
60
80
100
3/4" 7/8"
0,65 0,70