Question on boiler protection valves?

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by hobbyheater, Dec 10, 2012.

  1. hobbyheater

    hobbyheater
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    Danfoss Thermostatic protection valve versus a Honeywell V 135 used with a T100 R thermostatic control. Question is, if the boiler water is not up to the set point of the mixing valve, will either of these valves allow a small amount of colder return water from the zones past and back into the boiler or do they totally cut off any return water. A friend is installing a Portage & Main Optimizer 250, and at present he is using the Honeywell V135 with a T100 R thermostatic control. It seems to not be letting any return water by until the boiler water gets to 160 F.
     

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