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Posted by Greg on December 10, 2007 at 10:05:53:
In Reply to: Re: 2 issues, possibly related... posted by HeatPro on December 09, 2007 at 15:11:30:
: It is possible to test the old by removing it and watching it switch with the probe in a pan of hot water as the water temperature changes in the pan.
I love that idea. Looking at the manual for it, it looks like the probe sits in a metal tube (well?) that itself enters the boiler, so I should be able to shut off the boiler and remove it without draining any water, yes?
Is it a tricky thing to get it to make proper contact with this well when re-installing? The manual suggests using plumber's putty, you mentioned a specific product to use as thermal grease, I assume this would mean forgoing the putty?
I found it difficult to get a thermometer onto the boiler casting itself, so Iput one right on the output pipe... wrapped it in insulation... steady state it seems to read the same as the gauge, but when the temp is falling the gauge seems to lag behind the thermometer, and when rising the thermometer seems to lag behind the gauge.... I tried to make sure the circulator was running... the thermometer topped out at about 194, when the gauge topped out at about 215
Lastly, I tested the pressure in the expansion tank ( I believe it's bladder type), read 14 psi, but when I removed the gauge it was wet... tank feels almost room temp on the bottom, definitely warmer on top, tapping with a screwdriver handle sounded solid near the top, and hollow beneath the weld, but solid again right on the bottom...