water cooled chiller

[torresbraga]

hi Dear,
Could you or any one help me on this chiller which starts ok but after 2 minutes trip on alarm no.75 which is evaporator control switch or motor control,
cheers.
Torres

[nike123]

And make and model of chiller is....?

[hoodemar]

it sounds as carrier. anyway u need to check flow switch and the other equipment which r connected to the terminal of this alarm. if it is carrier 34-35.

[torresbraga]

Sorry guys,
the brand name is Carrier and model is 30HXC

[zulb76]

Evaporator pump control for chiller or
water flow switch failure...

[nike123]

http://www.refrigeration-engineer.com/forums/showthread.php?t=16839

[hoodemar]

Evaporator pump control for chiller or
water flow switch failure...

could u solve the problem?

[That's too cold]

If the water flow is too slow, the suction pressure will decrease quickly (trip LP), or the flow switch may not activate and shut down compressor. Also make sure you have a continuous loop of water flowing even after all the branch water valves are shut down.

[serviceman]

check the orientation of the flow switch is correct, clean the filter "Y", and check the pressure drop between the inlet and outlet evaporador.y finally check if the water pump is right

[49ershvac]

you might have a bad sensor which causing to shut down the chiller....