Zone over heating

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Old 11-29-20, 06:15 PM
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Zone over heating

on my gas boiler the zones are controlled by grondfos circulating pumps
my basement zone is set at 72 but its 77 in here. I replaced the internal check valve on the pump but it changed nothing. What next? Did I get a bad check valve did I put it in wrong?
 
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Old 11-29-20, 09:50 PM
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Welcome to the forums.

Did you confirm that the pump was not running ?
 
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Old 11-30-20, 10:32 AM
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Hi, does the boiler shutting off when the space reaches 77*?
Geo 🇺🇸
 
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Old 11-30-20, 01:16 PM
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The boiler has to be ready to cycle on and off again and again until all zone thermostats have stopped calling for heat.

Have the radiators in the affected room (in the basement) started to cool down once the room temperature had gotten too high?
 
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Old 11-30-20, 02:14 PM
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S57,
Turn your basement stat all the way down and call for heat in another zone. With the boiler running feel the supply line going to your basement zone. Depending where your pump is will depend on what you feel for pipe temp but it should never be hot from the supply to the return. If your pump is on the return line your supply pipe might be warm due to boiler water gravity feeding when hot but if you follow your supply line it should stop before long if your check valve is working and your pump is off. If your pump is on the supply side it should be hot up yo the pump and then cooler right after the pump.

If your pipe stays cool or room temp, turn off the other zone and turn on your basement zone and check the difference.
 
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Old 11-30-20, 06:40 PM
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I just double checked Pump is not running. Now weather it has during the day no clue

 
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Old 12-01-20, 05:18 PM
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Ok here's what I did I turned first floor thermostat down to 70 (2deg. Less than basement) went to bed this morning all thermometer agreed with thermostats. Came home tonight everything still just like it should be.
. Now comes weird part . I went upstairs turned thermostat up 2deg. and basement climbed 4deg.

whats going on? Honeywell digital thermostats with Grundfos pump on each zone.
 
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Old 12-01-20, 05:24 PM
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When you turned your stat up 2 deg upstairs did you check your supply pipe in the basement and see if your baseboard was getting hot.

Pics would be helpful of your piping and pumps.
 
 

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