That's what I like

Alan(CaliforniaRadiant)Forbes

about this business; never a dull moment, always something new.

This is something I can't figure out and neither can any of my suppliers; so I need a little help from the heating clan.

This is a radiant heating job with a Taco zone valve controller; this controller operates manifold actuators at a remote (about 20' away) manifold. On a call for heat, 24 volts gets to the actuators, but they don't open and the end switch doesn't close.

Some notes:

- The actuators get warm, but not as warm as a properly working actuator.

- There are 6 actuators on the manifold and they all act the same way.

- It's not a problem with the thermostats; I jumpered the wires.

- Actuators are 3 VA ea.; 6 of them adds up to 18 VA and the transformer is 40 VA. But just to make sure, I took 4 actuators off the grid and they acted the same.

- I spoke to my Taco and Rehau rep's. and they said there haven't been any problems with their products.

I plan to go back and try those actuators with different transformer; after that, I'll be stumped.

Any ideas?


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Mike T., Swampeast MO

Have you checked amperage?

i.e. ammeter in series with valve(s) when supplied with current?

A poor or loose connection will show proper voltage.