Lg mps system ( expansion valve location)

[hussain2002cab]

Dear all this is my first thread & i need a help,

LG MPS SYSTEM (Multi Power System) is malti spilt system. im working in a project where there are 3 models of condensing unit
* 1st model (12.5 tone) out door unit have two discharge line & suction line, one of them connected to bdu ( distributor having thermostatic expansion valve) then to fcu. Other one capillary tube directly fitted in out door unit discharge line.

*2nd model, out door unit have two discharge line & suction line connected directly to the fcu & capilary tube directly fitted in out door unit discharge line.

*3rd model (smaller size) out door unit have two discharge line & suction line connected directly to the fcu & expansion valve located within fcu.

*note that this system have the capability of 50 meter run from out door to bdu & from bdu to fcu 15, in addition the other two models have 50 run max.

my doubt is if you locate the expansion valve within out door unit & you have such a long distance that’s mean the whole pipe run become part from the evaporator (pipes sweating) also that mean waste of energy.

the argument is that LG specialist telling their design is correct. Any comment?

[hussain2002cab]

in addition both pipes insulted by single insulation not separately

[Brian_UK]

in addition both pipes insulted by single insulation not separately
Each pipe must be insulated separately for the system to work correctly.

[hussain2002cab]

so there is no issue regarding to orifice tube location ( only insulation to be done separately)

[Brian_UK]

If the system has been connected as per the manufacturers instructions then there should not be any issues with the system.

If you have not followed the instructions then who can say what will happen with the system?

[hussain2002cab]

thank you very much Mr Brian

[marc5180]

Many manufacturers put the expansion valves in the outdoor unit, not just LG.

I know one of the reasons is due to the noise the expansion valve can make.