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How to loosen setscrews on scaleplate to recalibrate pressuretrol
rrwitherspoon
Member Posts: 104
Pressuretrol not turning boiler off at 5 psi when set cut in 0.5 psi and cut out 1.5 psi.
Seems not functioning observed pressure up to 5psi I have to turn boiler off myself
Seems not functioning observed pressure up to 5psi I have to turn boiler off myself
0
Comments
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Have you checked the pigtail is not blocked? While the pressuretrol is off check the little hole at the base of it's brass fitting to make sure that little hole is clear.
Also make sure the spring has not decoupled from the lever.
BobSmith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
Vaporstat with a 12oz cut-out and 4oz cut-in
3PSI gauge1 -
That's more than a calibration error. Follow Bob's advice -- and check the pigtail and where it goes into boiler, too.
Might make sure that it is wired properly, if that doesn't hep...Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England-1 -
The pigtail is clear.The little hole on bottom of pressuretrol is patent. How do you make sure not decoupled from lever?0
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Wired as it always was when functioning .Pink wire at top.0
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On the left side of the lever there is a threaded ferrule that the top pressure adjustment screw threads into. That sometimes gets unscrewed, make sure it is engaged.
Sometimes the microswitch contacts get welded closed. To test that, remove one of the wires on the switch, if the boiler shuts down the pressuretrol is at fault. BE CAREFUL THOSE WIRES CAN HAVE 120V ON THEM - turn off the power before messing with them.
BobSmith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
Vaporstat with a 12oz cut-out and 4oz cut-in
3PSI gauge5 -
Ok i will try when i get home0
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Everything is engaged. No misaligned ferrules
or levers. Should the contact fork wires of pressuretrol be placed between metal nut and screw? Like a sandwich ? Maybe that is the problem.0 -
As long as the wire is under the head of the screw or one of it's washers, the contact should be solid. Have you had a chance to turn off the power while the boiler is firing and delivering 5PSI, remove one wire, and see if the boiler starts up when you reapply power? If the boiler. If it does not it indicates something is wrong with the pressuretrol.
There is always the possibility that the gauge is not working right. At 5PSI I would expect the vents would be hissing a bit loud, any signs of increased noise?
BobSmith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
Vaporstat with a 12oz cut-out and 4oz cut-in
3PSI gauge0 -
Yes, at 5 psi the last radiator supply valve hisses and a leak appears that otherwise you would not even detect0
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I will get vapostat and low pressure gauge installed0
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Shall I install vaporstat just like pressuretrol.
I noticed there 3 wires instead of 20 -
SPDT terminals. You want break on rise.0
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Does one use all 3 terminals?0
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No. You want to connect to the two terminals R and B that "break on rise." Don't buy a two terminal vaporstat.0
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I hope instructions come with vaporstat for wire connections
L408 1017 model number0
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