low water cutoff

tmc

Anybody having problems with McDonnell miller pse 802 probe type low water cut offs? installed 4 burnham independence steam pin 4 and pin 3 boilers and all are shutting off on low water when there's plenty of water in glass. I removed probes which all looked clean but wiped them off anyway, reinstalled and still had same problem. Boiler will fire for about 1 min low water red lite will flash boiler will shut down, water level rises from condensate, boiler fires and then repeats cycle. Once again, this happens with water level above probe.

nicholas bonham-carter

Through a glass emptily

Could the initial cutting oil+ return rust have clogged the gauge-cocks, so the glass is not showing the true level? A new install has a lot of junk floating around in the system.

Could the probe be electrically insulated with Teflon tape?--NBC

MDNLansing

Ditto

Ditto NBC. Make sure the probe is grounded (no tape on threads). Been there, done that.

tmc

low water cutoff

doubtful guage cocks are clogged, this happened right from initial start up, but i'll check it out. As far as Teflon on probe as I mentioned on last post they were cleaned.I have a feeling there may have been a bad batch of low water cut offs. any other ideas?

nicholas bonham-carter

Dirty power?

Those probes are so electronic. Could there be a power problem: bad grounds, etc?--NBC

JStar

LWCO

Make sure the factory jumper is screwed down tight. Check the other wiring connections as well. I've had a loose jumper from the factory before. It would run for a minute, then rattle loose and shut down.

tmc

problem solved

replaced low water cutoffs with new ones, all 4 boilers working perfectly.

BobC

Good to hear

Did the counterman say anything about a defective batch?



Bob