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pressure relief blowoff

ron v
ron v Member Posts: 9
tank is a ct30, i did not check the pressure. the tank was not full of water. thank you


  • ron v
    ron v Member Posts: 9
    head pressure

    I went to service call today at a preschool. Burnhamp206-WI with 5 zones including indirect. the boiler pressure will reach 30LBS at 190' F would blow off the NEW 374A. well decided to check the piping method they may have used. they sent 11/2 copper M up into attic about 20' they had 4 3/4 lines coming off supplying each zone. so i measured each zone of suntemp550 baseboard. i found 1 zone was 140' long. is this the reason the boiler is blowing off. with a remodel recently. they piped the zone over doorways and windows and boxed it in. my question is to prevent this preschool from spending a fortune. i found a way to split zone at 67' and retun 1 side back and supply other side can i keep it on same zone thus putting more pipe into zone? or should i zone other side? (zoned with zone valves)
  • kevin coppinger_4
    kevin coppinger_4 Member Posts: 2,124
    what about...

    the expansion tank? What size tank and how much baseboard?

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  • jim lockard
    jim lockard Member Posts: 1,059
    Follow Kevins

    Lead check your X-tank you may or may not need more expansion. Take your system back to working pressure and see what happens. You may have a poorly piped system, but I do not believe its why your blowing the relief. J.Lockard
  • Big Ed_3
    Big Ed_3 Member Posts: 170

    If the pressure increases with temperature rise then you have a expansion tank problem . Bad tank or not enough...... More the volume of water being heated , the larger the expansion tank you need ... IF it's been fine for years and nothing has been added , then your tank is loosing its charge . Does not have to be fully water log to cause a pressure increase ..... It may need to be recharged ... Bicycle pump around ?
    Hope this Helps
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