Ferroli OMNIA HYBRID C, Инструкция по установке, эксплуатации и обслуживанию

Страница: 19 / 116

19
EN
Cod. 3541T090 - Rev. 00 - 06/2019
INSTALLATION
6.8 Refrigerant pipe insulation
To ensure system efficiency and its correct operation it is necessary to use pre-
insulated cooling connection lines easily available on the market. Pay also atten-
tion to the connection points according to what described.
Use thermal insulating tape to tie the hoses, from the area connecting the outdoor
unit cocks to the upper end of the hose in correspondence of the wall entry point.
(side figure) .
fig. 23 -
6.9 Pipe fittings tightening
Make sure that the connecting zone is free from dust and dirt.
• Make sure that the flare and connection are perfectly aligned.
• Tighten the union first by hand and then with an adequate torque wrench.
Leaks could occur if the parts are insufficiently tightened, while the flare could be damaged if it is tightened too strongly.
The table below lists the torques recommended for the various pipe diameters.
Nominal Diameter (“) External Diameter (mm) Ø
Tightening torque
Nxm
3/8 9.52 30-40
5/8 15.88 60-65
6.10 Tightness check (recommended operation)
Before setting the system in a vacuum, it is advisable to make sure that the cooling
circuit is tight, including the connecting joints between the pipes and the indoor
unit. Proceed in the following way:
• With the service valves of the outdoor unit completely shut, remove the cap
from the service tap (1- side figure) of the gas connection (the larger one)
• Connect the service valve to a monometric unit plus nitrogen bottle (N2).
• Pressurize the system to a maximum 30 bar using the nitrogen in the bottle.
• Use liquid soap to check that the joints are tight.
Keep the bottle vertical during the pressurizing operation to prevent liquid nitrogen
from infiltrating into the system!
• Check all the connection joints on both the outdoor and indoor units to make
sure that they are tight. Bubbles will form if leaks are present. If bubbles
appear, make sure that the unions have been tightened and that the flares
are the right shape.
• Wipe off the liquid soap with a rag.
• Reduce the pressure of the nitrogen in the circuit by loosening the charge
pipe from the bottle.
• Having reduced the pressure, disconnect the nitrogen bottle.
GAS
CONNECTIONS
U.I.
U.E.
fig. 24 -