Chiller flow switch troubleshooting
Chiller flow switch troubleshooting
(OP)
Dear fellows:
I am working on a YORK 100-ton chiller which fails to start every morning. According to the operator, the display indicates a no flow condition, even with the chilled water pumps running. Sometimes a little bump to the flow switch casing is what is needed to get the chiller running. A previous engineer hinted a piping system air lock situation.
I have been exploring this suggestion and have found air vents located throughout the system. Also, the fact that just some hitting to the flow switch engages it, makes unlikely the air lock scenario, I think (this bumps will not get rid of air in the pipe). Any other explanation?
I am working on a YORK 100-ton chiller which fails to start every morning. According to the operator, the display indicates a no flow condition, even with the chilled water pumps running. Sometimes a little bump to the flow switch casing is what is needed to get the chiller running. A previous engineer hinted a piping system air lock situation.
I have been exploring this suggestion and have found air vents located throughout the system. Also, the fact that just some hitting to the flow switch engages it, makes unlikely the air lock scenario, I think (this bumps will not get rid of air in the pipe). Any other explanation?





RE: Chiller flow switch troubleshooting
RE: Chiller flow switch troubleshooting
A couple of things to check for.
1. Depending on the type of flow switch, try taking the cover off and see if it makes with the pump running.
2. If not, then take it out and see if the paddle has the ability to stroke freely.
3. See if the paddle can run a fully stroke in the pipe. Generally the arm that holds the paddle needs to be in the pipe as well as the paddle.
RE: Chiller flow switch troubleshooting
RE: Chiller flow switch troubleshooting
RE: Chiller flow switch troubleshooting