Troubleshooting Industrial Trane Chiller

[winenotwhine]

What does error message "Low Press Control Open--Circ one" means. I maintain a winery--before I call out a Trane Tech for mucho dollars,  can anyone tell me what might be going on here?

[dkpd1581]

Low Pressure Circuit Open means that the temp/pressure of the refrigerant in the system is below a certain cut out level.  Here a few possibilities:

Lack of refrigerant

Light load on the system (not much heat to be moved out of the controlled space)

Liquid line drier may be clogged - restricting refrigerant

Expansion valve powerhead may have lost its charge

Obstruction before expansion valve (filter drier, foreign debris, crimped line)

Low water flow (clogged strainers, defective water pump/impeller)

Some of this you can nose around and check for yourself, some of it you will definitely need to call out a Tech (Trane or otherwise).  The Trane Boys do good work; however, they are not the only ones who know how to work on that kind of equipment.  Shop around.

[winenotwhine]

Thanks. It's likely light load. With mild spring time temps I'm only cooling one 75' x 30' room with 16' walls and R30 insulation.