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Outdoor thermostat + Pump end switch

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I’ve got a system circulator on a Hydronic/mod-con boiler system that I’d like to run constant-on during cold temps, due to a pipe run in the floor near a garage door. 

In addition to controlling the circulator from the pump ES on the ZVC, I’d like to have an outdoor thermostat that provides a secondary path for the system circulator to run. Both switches may be closed at the same time, (below target temp AND call for heat, and this will often be the case on cold days.) The idea is to save some electricity in the shoulder seasons. 

Does this circuit design seem right? 




Comments

  • mattmia2
    mattmia2 Member Posts: 9,962
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    That would work. You might want to look closely at the manual of the boiler, some have freeze protection settings that might do this for you using the sensor for the ODR.
    northlakes
  • Jamie Hall
    Jamie Hall Member Posts: 23,653
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    Will it work? What powers the outdoor thermostat and RIB? I don't see a power source.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    mattmia2
  • northlakes
    northlakes Member Posts: 95
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    Will it work? What powers the outdoor thermostat and RIB? I don't see a power source.
    Yes, sorry about that. I over-simplified for sure. But yes there is a 24V transformer. 
  • hot_rod
    hot_rod Member Posts: 22,479
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    If you run it constantly and another zone calls for heat, won’t you be dumping heat to the garage?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    northlakes
  • northlakes
    northlakes Member Posts: 95
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    There’s a perimeter loop on the bottom floor with no zone valve and so yes it stays heated anytime there’s a call for heat in any zone. Not ideal but guessing previous owners pulled a valve out when the pipe froze at some point.  hot_rod said:
    If you run it constantly and another zone calls for heat, won’t you be dumping heat to the garage?

  • northlakes
    northlakes Member Posts: 95
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    mattmia2 said:
    That would work. You might want to look closely at the manual of the boiler, some have freeze protection settings that might do this for you using the sensor for the ODR.
    Scoured the docs and interface and didn’t seem to find anything that functions this way. May call IBC and make sure I’m not missing something.