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Mister forgetful

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wess
wess Member Posts: 1
in THE MAIN WALL
I took a one system boiler turned it into a two system. I have two Taco 007 circulators and two Taco flow controls on the system. my problem is that it is a Weil Mclain boiler with a Honeywell L8148E aqustat 1 put a R845A for the second thermostat witch is a T87 but i can not get the boiler to turn on the circulator runs but only when the down stairs thermostat is on will the boiler turn on . I can not remeber how to hook the up stairs thermostat up to make the boiler turn on when either thermostat calls for heat It is a natural gas boiler Any help would be Greatly appreciated Thank you Mister Forgetful

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  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,643
    There are

    two sets of normally open contacts on the R845A; 3 and 4 is one set, 5 and 6 is the other set.  You are probably using terminals 3 and 4 power the pump, no?  Terminals 5 and 6 can be used to tell the boiler to come on.  Wire them to T and TV on your L8148E, but make sure you don't jumper them to line voltage.  They should be used as dry contacts, i.e. no power.



    http://customer.honeywell.com/techlit/pdf/95-0000s/95-6127.pdf
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
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