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Posted by John on December 20, 2005 at 18:37:59:
I have a Honeywell 8124 aquastat running 3 Honeywell V8043 zone valves and 2 24V thermostats (a 3rd thermostat is battery operated). I test voltage at 22V when 2 zones are calling.
I also have a Taco SR501 for the indirect tank aquastat to switch the circ pump for the indirect. It always reads @ 27V.
Sometimes one zone valve seems to stick and not open. Tap the zone valve case and I hear it start to whirl and open the valve.
Could there not be enough voltage to power the zone valve properly?
Could I tie the SR501 and 8124 24 voltage leads together to get more power to the zone valves.
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