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Honeywell TZ-4 Misbehaving

Honeywell TZ-4 HVAC controller; 4 zones hooked up with power up zone closure dampers ; 3 zones w/ 2 dampers; 1 zone w/ 1 damper. Worked fine for first couple of days as should have. Now will only work if all zones are calling for heat leaving all zone dampers in naturally open position. Transformer is 24 volt a/c 75va. Voltage at 26 volts to 27 volts regardless of load. When first zone satisfy's within seconds it goes into purge mode opening all dampers and shutting down the furnace. Will not allow furnace to operate again until all zones call for heat? Any ideas??

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There is a "zone a lone" switch on the upper right side of the panel. Make sure it is in the "occupied" position. I believe that is up. If that doesn't work reply back.

Posted on Sep 18, 2008

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How do I connect a 24v damper motor with 6 colored wires red white yellow green blue black to NO COM NC terminals.


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To help understand the operation of a zone system, say you have 2 zone system and zone 1 thermostat initiates a heat or cool demand. Zone 2 valves energizes and shuts and zone 1 stays open and allow air to heat/ cool zone 1. If zone 2 thermostat simultaniously initiates the same heat/cool demand, the zone 2 valve opens and both zone heat/cool. When either thermostat is satisfied the opposite zone valve closes and when both thermostat are satisfied both zone valves open.
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