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TACO SR501 not turning on

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peterkss
peterkss Member Posts: 3
in Oil Heating
I have a Buderus Logano G115 which has a Logamatic R2107 USA Controler. The Honeywell Pro TH411OD1007 thermostat runs to the TACO SR501. The TACO has no lights. The thermostat works (tested with ohmmeter), but the TACO doesn’t come on. How would I check this relay?

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  • JohnNY
    JohnNY Member Posts: 3,231
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    No lights? Not even a green one? You've got no line voltage coming into the relay.
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
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  • Robert O'Brien
    Robert O'Brien Member Posts: 3,541
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    The 2107 supplies power to 501 or at least it should if wired correctly
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  • peterkss
    peterkss Member Posts: 3
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    It’s wired correctly since it was working until it stopped working. I checked for ac voltage from 2107 terminals to SR501 and there was none.
  • Jamie Hall
    Jamie Hall Member Posts: 23,324
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    Ah...is there, by any chance, a fuse in there somewhere? A lot of those things do.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • HVACNUT
    HVACNUT Member Posts: 5,841
    edited January 2019
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    Maybe too little too late.
    How is the SR501 wired?

    Typically the zone(s) relay is powered constantly when using the 2107.

    Terminal 63 on the 2107 is 120v power out to external zone controls. The DHW zone is controlled through the 2107.

    So,
    Constant 120v to the SR501. Green light always on.
    Connect terminal 63 on the 2107 to terminal 5 (com) on the SR501.
    Connect terminal 6 (N.O.) on the SR501 to the zone circulator.

    In any instance, there should always be 120v at terminal 63 on the Logamatic save for domestic priority, WWSD, or other man made programming.

    Have you tried switching the Logamatic to manual?
  • Joe Mattiello
    Joe Mattiello Member Posts: 707
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    Hi Peter
    the SR501 has diagnostic lights to help assess what is going on. Green light means power applied. without that, the control is dead. Need to start there. If 120v confirmed with green light, a shunt at thermostat terminals will validate a demand. Some thermostats require 24v to close the switch, so a piece of wire at TT terminal may be necessary to prove control. if red light illuminates when TT is jumped out you should have 120 volts at bottom of control 120v out terminals. hopefully this helps. If you're still having difficulties, please contact Taco tech support at 401-942-8000 for further assistance.
    Joe Mattiello
    N. E. Regional Manger, Commercial Products
    Taco Comfort Solutions
  • peterkss
    peterkss Member Posts: 3
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    Thank you all for your insightful and accurate advice. Turns out it was the Taco that failed.
    Pete

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