Liebert vacuum testing

[nike123]

Hi Guesstimator,

160 psi sounds a bit light for a pressure test. What refrigerant are the units running on?
I usually test R410a systems with 550 to 600 psi for at least 24hrs, better 48.

sumsor

You cannot exceed system design pressure for long time.
Some components are not designed to withstand highest pressure of system. As you know, compressors are usually having stated low and high pressure which cannot be exceeded. Sometimes, for example, low side cannot bare more than 11Bar (160 PSIG) of pressure.

[sumsor]

You cannot exceed system design pressure for long time.
Some components are not designed to withstand highest pressure of system. As you know, compressors are usually having stated low and high pressure which cannot be exceeded. Sometimes, for example, low side cannot bare more than 11Bar (160 PSIG) of pressure.

Hi Nike,

do you need to do two pressure tests in this case then? One only the pipework and indoor at high pressure and one for the wole system at low pressure?
If R410a then 11 bar is way under the high pressure cut out of around 40bar or system running pressure in heating of around 28 bar.

Sumsor

[nike123]

Hi Nike,

do you need to do two pressure tests in this case then? One only the pipework and indoor at high pressure and one for the wole system at low pressure?

Yes!

If R410a then 11 bar is way under the high pressure cut out of around 40bar or system running pressure in heating of around 28 bar.

Sumsor

Usualy R410 systems are designed to bare with high pressures. Scroll compressor for R410 as Copeland ZP180KCE has low side pressure restricted to 29,5 Bar and high side pressure to 45. therefore you cannot pressure test it on low side with more than 29,5 Bar.
Depending on other components in system, that could be even lower.