Tightness Check (Recommended Operation) - Ferroli DIAMANT M Series Use And Maintenance Manual

DIAMANT M

2.11 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 (part 1 - "fig. 23 -") and the union
(part 2 - "fig. 23 -") of the gas valve (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.
Perform the leak test for all connection lines (i.u.a, i.u.b, i.u.c).
fig. 23 -
36 Cod. 3QE46140 - Rev. 00 - 11/2019
EN