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<blockquote data-quote="flynwill" data-source="post: 201" data-attributes="member: 56"><p>I would suggest using triac switched 24VAC circuits for both valve actuators (need 2 per valve) and for any 120/240 Volt switched loads. Then builders could use standard (and UL listed) relays for the line voltage switching (eg Omron G7L series).</p><p></p><p>For the valve actuators, I would recommend a pair of triacs to switch the 24V power and a discrete single-transistor inverter that ensures only one triac will be on at a time. Some care will be needed with the power budget -- the Valve actuators draw 3/4 amp (18W) when running.</p><p></p><p>A current sense on the valve control outputs would also be useful, that way the control software would be able to tell when a valve has reached it's position.</p></blockquote><p></p>
[QUOTE="flynwill, post: 201, member: 56"] I would suggest using triac switched 24VAC circuits for both valve actuators (need 2 per valve) and for any 120/240 Volt switched loads. Then builders could use standard (and UL listed) relays for the line voltage switching (eg Omron G7L series). For the valve actuators, I would recommend a pair of triacs to switch the 24V power and a discrete single-transistor inverter that ensures only one triac will be on at a time. Some care will be needed with the power budget -- the Valve actuators draw 3/4 amp (18W) when running. A current sense on the valve control outputs would also be useful, that way the control software would be able to tell when a valve has reached it's position. [/QUOTE]
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