Munchkin heads up for snowmelt

Rocky_3

flipped the switch two weeks ago and got F02 and F03 sensor errors. Inlet and Outlet temperature thermistors not registering due to extremely cold glycol mixture coming in off the snowmelt system (-15). At these temperatures, the resistance readings get too high and the control basically doesn't know what to do so it goes into error mode; much like the old Erie Boiler Boss' did when the outdoor air temp went past -42. (We had alot of houses freeze up due to the Boiler Boss shutting down because the control didn't know what to do when the sensors read a temp lower than that. They basically just "gave up.") We had to get a few spare thermistors, unplug the wiring harness from the imbedded thermistors and plug in the new thermistors to basically sense air temp so as to fool the boilers into firing long enough to heat up the heat exchanger. Then we quickly plugged the wiring harness back into the imbedded thermistors and then the boiler would run. We just had to prime the heat exchanger with a little heat before using the integral thermistors. Just an FYI for anyone who will be doing snowmelt with these boilers in cold temps.

Regards,
Rocky