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Re: Munchkin M80 boiler not heating enough.
If the fan is spinning at full firing rate and combustion reading are at spec. and there is no boiler water path clogging, you can take accurate temperature measurements ( thermistor strapped to pipe and insulated ) of the water leaving the boiler and returning to the boiler and subtract those two numbers to get the Delat T. You can then estimate the flow from a pump curve and boiler flow vs pressure chart. Then you can do the math for BTU's/hr being delivered. Math: Boiler flow (GPM) x 500 x Delta T (difference in temperature of supply and return in F) = BTU/hr. If it's near or above 72,000 the boiler would appear to be doing what it is designed to do. The depth that tubes are set at in the slab, slab thickness and the difference between indoor air and slab surface are factors in how many btu/hr that slab would need to warm up.
After three weeks the slab surface temperature, measured 10' from foundation edge in areas the loops have been heating should be noticeably warmer than indoor air.
If the structures heat loss is greater than 72k btu/hr it will never completely warm up the air.
If you restrict flow to just a few loops you have limited slab areas reducing emitter area (heated floor area) and it will not heat the space well.
If the flow in the loops is not balanced you are not heating the whole slab evenly and slab output will be limited.
If the slab is covered with an insulator it will limit capacity.
The thermal mass of a 2,700sf 6" thick slab is substantial. If going from 36F to 80F slab temp., it's over 2 million BTU's or 28 hrs at 72k/hr. Trouble is, heat is lost while you are heating all that mass so a three day burn might be rational. The mass of connected block walls added makes it even harder to heat up.
Small boiler, hard job.
After three weeks the slab surface temperature, measured 10' from foundation edge in areas the loops have been heating should be noticeably warmer than indoor air.
If the structures heat loss is greater than 72k btu/hr it will never completely warm up the air.
If you restrict flow to just a few loops you have limited slab areas reducing emitter area (heated floor area) and it will not heat the space well.
If the flow in the loops is not balanced you are not heating the whole slab evenly and slab output will be limited.
If the slab is covered with an insulator it will limit capacity.
The thermal mass of a 2,700sf 6" thick slab is substantial. If going from 36F to 80F slab temp., it's over 2 million BTU's or 28 hrs at 72k/hr. Trouble is, heat is lost while you are heating all that mass so a three day burn might be rational. The mass of connected block walls added makes it even harder to heat up.
Small boiler, hard job.
Teemok
2
Re: Asbestos (paper type) behind recessed radiator - who can help?
The ACM contractor I know, is ready, willing & able to remove and disconnect anything in containment area that needs to be. As long as we isolate & if needed, drain the unit in question (say a boiler, huh, tanks) they will gladly do it. It only makes sense as they are fully donned up in MOPP gear and Respiratory apparatus. Mad Dog 🐕
Re: Boiler/Baseboard System - Pump not always running
Hello @lilweezy29,
As previously mentioned as long as the thermostat is calling for heat the circulator should be running. Observing the system and/or testing with a multi-meter may help discover why it is intermittent.
1. Thermostat closes (call for heat).
2. Relay coil 'CR' is energized.
3. Relay contacts CR1 and CR2 close, simultaneously energizing two isolated circuits.
3a. CR1 supplies power (passing through the limits and safety controls) to the Damper.
3b. CR2 supplies power to the Circulator (energized it continuously).
4. Circulator is running (continuously) and the Damper opens.
5. When the Dampers opens all the way and the Damper End Switch closes and the Gas Valve is energized.
As previously mentioned as long as the thermostat is calling for heat the circulator should be running. Observing the system and/or testing with a multi-meter may help discover why it is intermittent.
1. Thermostat closes (call for heat).
2. Relay coil 'CR' is energized.
3. Relay contacts CR1 and CR2 close, simultaneously energizing two isolated circuits.
3a. CR1 supplies power (passing through the limits and safety controls) to the Damper.
3b. CR2 supplies power to the Circulator (energized it continuously).
4. Circulator is running (continuously) and the Damper opens.
5. When the Dampers opens all the way and the Damper End Switch closes and the Gas Valve is energized.
109A_5
1
Re: Circulator Pump size and Qty
I think what you saw on left is the big black insulated box. I think for air purge ?
I am not sure the answer to most of the other recent questions
I am not sure the answer to most of the other recent questions
mpdport
1
Re: Part# for Outdoor Temperature Sensor for Viessmann Vitodens B1HE-199
Important to use a single run, no splices.
dko
1
Re: Meaga press for steam
Mega pressed joints have all kinds of rotational movement in them after they are pressed. Its way more than a threaded joint . Some can get 10 to 15 degrees.Threaded steam joints have no movement in them. Anyone who has tried to remove a fitting knows this!
kinda scary how much. But they dont leak.
Re: Some rads hissing, some not
I’m wondering if I should just try putting a half way decent air valve on one of the whistling rads to see if it does anything, but I also don’t want to just start throwing parts at it.
Re: The case of the tripped auxiliary low water cutoff, this weeks case
My shot: Oil was introduced into the boiler water from new pipe work and this caused surging with a sudden drop in water level that triggered the manual reset--when examined after the fact, everything seemed to be in order. They would have had to be watching the gauge glass at the time of the surging to see it occur.
Re: Radiator Ball Valve?
Some of those cheap valves can be made to stop leaking by tightening the nut that holds the handle on. If you run out of threads try adding a washer between the nut and handle. If that does not stop the leak, replace the valve.
