Pressure testing

Pressure testing

Pressure testing

Once all of the Refrigerant Pipe work has been installed onto your split system, you will need to Pressure test the whole system The Pressure Testing should take place before the system is Powered up for the first time. This ensures that the LEV's (Linear Expansion Valves) in the system will be in the factory position open Following BS EN 378 standards you should use OFN (Oxygen Free Nitrogen) to:

STRENGTH TEST

and

TIGHTNESS TEST

Strength test

45.7 bar

Strength testing split systems is to ensure there are no deformations of joints or pipework and no obvious signs of a leak The pressure at which you Strength Test a system can be calculated using the following:

System Maximum working pressure x 1.1

The system maximum working pressure on Mitsubishi Electric systems is 41.5 bar. This is the setting of the High Pressure Switch This is calculated using the condensing temperature of 55 degrees for R410a/R32 gas Therefore.......

Tightness test

The calculation is: Maximum working pressure x 0.9 to 1

The tightness test is carried out to ensure there are no pressure drops over a long period of time. Ideally the system should be tightness tested for 24 hours The pressure at which the system is tightness tested is a lower pressure than the strength test

41.5 bar x 0.9 = 37.5 bar 41.5 bar x 1= 41.5 bar The tightness test pressure range is

37.5 to 41.5 bar