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Have 2 thermostats, 1 for sleeping area upstairs and 1 whole house located downstairs. whole house thermostat won't open dampers to allow downstairs vents to blow A/C or heat. no matter which thermostat is on, a/c or heat only blows thru the upstairs vents. control system in the attic is a HONEYWELL MINIZONE KIT, EMM-3K. What do we need to do to get system to open dampers to blow a/c or heat thru downstairs vents. other wise the a/c and heater is working fine, just that the minizone that controls opening the dampers is not opening for downstairs. the minizone emm-3k has 3 zones.

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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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