I've got a Drayton Tempus One timer controlling my combi and want to bridge
it with a thermostat so I can leave the timer turned off during the warmer
months whilst maintaining the ability to turn on the CH if the temp drops
below a certain point at night. Purchased a Danfoss RET-MD and wired its
switched contacts across the timer's switched contacts, but the control
voltage to the boiler drops to around 190VAC. Even with the timer out of the
circuit altogether the control voltage is low. The wiring diagram for the
Danfoss stat indicates that the switched contacts are isolated but something
is drawing down the control voltage.
Any ideas where I'm going wrong? tia!
How are you measuring the voltage? If you are just measuring across the
contacts then your figures may be correct, however if you are measuring with
one leg (of your meter) on a neutral you may have a problem.
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