Question about Honeywell Heating & Cooling
It seems as though you have a polarity mishap. The damper valves will be VDC if the downstairs thermo is driving them to open with full VDC and the polarity was reversed it will drive them closed. The Thermostat will not know this. Using a DMM and the upstair thermo measure bthe voltage to the damper valve. Does it read + or -? Then leaving nthe DMM hooked up try the downstair thermo does bit say the same voltage but - or +? they shouldn't be different. Solution.....reverse the polarity to the damper motors coming from the down s. stat.
Posted on Feb 01, 2010
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Posted on Jan 02, 2017
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