Pressure Testing And Leak Check - Immergas AUDAX PRO 5 Instruction And Recommendation Booklet

5.7 PRESSURE TESTING AND LEAK
CHECK.
- To prevent foreign substances from getting into
the circuit and to ensure the essential resistance
to the pressures in play, it is fundamental that
only an R-410A manometric unit be used.
- The pressure test must only be done using dry
nitrogen.
Pressurise with dry nitrogen at 4.1 MPa via the liquid and gas pipe.
Leave everything alone for at least 24 hours to check whether the
pressure falls.
If pressure decreases, it means there are leaks.
Maintain a pressure of at least 1.0 MPa and check for leaks again before
putting the circuit under vacuum and drying it.
Manometric unit
Audax Pro 5
Low pressure
side
Service
door
5-11
To check for leaks, you must use an approved
foaming solution. Using a solution of water and
normal soap risks damaging the flare nuts or
triggering corrosive processes in the flare joints.
Attention: should a coupling be disconnected,
the gas that escapes could cause injuries when
coming into contact with people. Tighten the
couplings as required to prevent these accidents.
Should the unit be pressurised with nitrogen at more than 4.1 MPa,
the pipes could be damaged. Pressing must be done using a pressure
Pressure variations that can occur after pressurising with nitrogen must
Should pressure decrease, a foaming solution must be applied to all the
junctions to locate the leaks. Bubbles forming in the foaming solution
pinpoint the location of the leaks, which must be eliminated before
After having repaired any leaks, you must maintain pressure at 1.0 MPa
Audax Pro 8 and 10
High pres-
sure side
Pressure regulator
(indispensable)
Nitrogen
18 18
regulator.
be checked using a pressure regulator.
re-pressurising with nitrogen.
at least and check for leaks again.
Manometric unit
Low pressure side
Service
coupling
Gas pipe
Service coupling
High pressure side
Pressure regulator
(indispensable)
Nitrogen