Okay so I noticed a couple of days ago that my gas boiler was acting strange.
I turned on the heat on my thermostat and my radiators were heating up. But after about 20 mintues the radiators weren't giving off heat when the thermostat was still calling for heat. I checked and saw the boiler vent damper was open and boiler temp. dropped to 105 F.
So then I turned the thermostat off and then back on to heat and the boiler started to fire up again. So i decided to observe the boiler to see what might be causing this issue.
1)First the boiler heats the water to 145 F.
2)Then the circulator pumps the water to the radiators and the temperature drops to 135 F and the boiler fires again at that time to bring the water to 155 F.
3)The boiler water is still circulating to radiators and the temperature went down to 135 F in around 15 minutes time and the boiler is supposed to fire up so the boiler damper started to open again but the boiler does not fire up(the thermostat was still calling for heat). Then the temperature started to drop fast and went down to 101 F. So I did the same thing immediately turned the thermostat off and on and the boiler fire again and then its the same thing with the vent dampers in the open position over again.
So basically when the thermostat is turned on and calls for heat the burners fire up and will keep firing up when temperatures drop but after a certain period of time ( not really sure the amount) while the thermostat is still calling for heat the dampers will open up but the boiler will not fire.
I have I upgraded the factory aquastat to a hydrostat 3200 plus but I noticed the TR and the TH terminals on the gas valve was switched around according to the wiring diagram. I corrected the wiring but still getting the same issue.
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So I tried different things:
1) Turned the burner power off and on still same issue.
2) The hydrostat is set to economy mode 4 so I tried to turn off the economy setting when the dampers were in the open position again and voila the burner started to fire up again.
3) checked the roll out switch and high limit no problems
4) checked the voltage reading on the burner circuit when firing on it was 24v and when the vents were open but doesn't fire it reads 0.1V
So what are you guys opinion? Im thinking it might be a defective hydrostat. Are these devices prone to these failures on what seems to be a pretty simple operation. I would think there would be some kind of fail indication but nothing at all.
This is a dunkirk pvwb-5d boiler with 2 zone valves
Gas burner valve Honeywell VR8200A 2264
Upgraded to hydrostat 3200 plus turned on economy mode
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So I tried different things:
1) Turned the burner power off and on still same issue.
2) The hydrostat is set to economy mode 4 so I tried to turn off the economy setting when the dampers were in the open position again and voila the burner started to fire up again.
3) checked the roll out switch and high limit no problems
4) checked the voltage reading on the burner circuit when firing on it was 24v and when the vents were open but doesn't fire it reads 0.1V
So what are you guys opinion? Im thinking it might be a defective hydrostat. Are these devices prone to these failures on what seems to be a pretty simple operation. I would think there would be some kind of fail indication but nothing at all.
This is a dunkirk pvwb-5d boiler with 2 zone valves
Gas burner valve Honeywell VR8200A 2264
Upgraded to hydrostat 3200 plus turned on economy mode
