1930 AS HW furnace hi temp/press
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scott92
Posts: 1
in Oil Heating
After a cold night with thermostat set for 63, the furnace showed 22 psi and 200 deg F. Tap HW measured at 180! Furnace cycled to maintain temp of house thru night. Why is HW so hot?
0
Comments
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Faulty tempering valve.
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Or no tempering (mixing) valve. The 22 psi could be from undersized and/or failing diaphragm expansion tank, or water logged expansion tank…or the boiler feed…or air.
The 200° is just where your hi limit is set.0 -
What is the pressure normally when hot? 22 psig hot is fine on a 30 psi boiler if the expansion tank is smallish for the size of the system or the system is tall. If it isnt creeping up over time when it is hot it is fine.
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