Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Argo relay issue

KenJ
KenJ Member Posts: 8
in Thermostats and Controls
I have a Argo AR861-211 two zone relay. Thermostats connected with red and white terminals only. Two zone pumps connected and the Argo "A" and "R" terminals connected to a Bosch Greenstar boiler. Boiler supplies power to the relay from dedicated connection for zone pumps. When either thermostat calls for heat, the relay does not work unless I jumper across A and R terminals. The thermostats are working as the relay knows which zone called for heat and will cut off the pump when it reaches set point. Any ideas?

Comments

  • HVACNUT
    HVACNUT Member Posts: 6,282
    Is there a jumper between L and W?
    It seems that A-R only becomes an isolated end switch when L and W are jumped.
    If already jumped and only physically jumping A-R starts the boiler, then it's seems there's an open in the Argo circuit board. If you're handy with a soldering gun you can have at it. Otherwise replace the control. 
  • KenJ
    KenJ Member Posts: 8
    Yes, jumper is in place between L and W.
  • yellowdog
    yellowdog Member Posts: 166
    is this a new install? or just a new problem? does the "zone pumps" connection on the greenstar provide constant 120v power to the argo control?
  • KenJ
    KenJ Member Posts: 8
    New install but the relay is an older one that the plumber must have had for awhile. There is constant power from the boiler to the relay.
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,266


    The L1 and L2 from the ARGO needs to be connected the Hot and Neutral from the disconnect switch. By connecting the ARGO L1 and L2 to the Greenstar Circulator output, you need the thermostat to power the Greenstar in order to get electricity to the ARGO. But the thermostat is connected to the ARGO that has no power until you jump the A and R.

    Put L1 from the ARGO on the L1 in the GreenStar. Not on the Circulator output.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • KenJ
    KenJ Member Posts: 8
    I figured it out. Partially my fault and crappy documentation in the boiler install sheet. Yellowdog's question of contant power made me second guess my response so I got out the multimeter and tested. The boiler AC supply that I had hooked to the relay is off until triggered. Swapped it off the boiler to a new circuit and the relay works as it should.

Categories