On Wed, 23 Oct 2019 22:21:11 +0100, Steve Walker
wrote:

On 23/10/2019 14:52, NY wrote:
Failed Honeywell CH valve motor replaced on 2 Oct. That motor failed
about 14 days later and was replaced today, 23 Oct. I'm assuming that
the first replacement really was a brand-new motor, and not one that had
already failed from another customer and been accidently fitted in
mistake for a brand new one.

The valve itself was easy to turn, so it hadn't jammed and caused the
motor to draw more current because it couldn't turn.

It wouldn't matter if it was jammed. They are synchronous motors and the
limit switch is only for feedback. In normal operation they run and
drive the valve open and when it reaches the end of travel the motor
simply sits there, energised, but stalled until the power is removed and
the spring pulls it closed.


On the Honeywell diverter valves there is a mid position that uses
magic to hold it there. ;-)

Cheers, T i m