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How to connect to other zone panels with 2 wire damper outputs:
And Converting a 2 wire zone control board to operate 3 wire damper
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Connect the two existing damper ouput wires to Belimo terminal 1 and 3.
Connect the Belimo motor terminal 2 to any thermostat input “R” on board.
Use black push button clutch on motor to rotate damper half way open, then release clutch.
A. If motor powers open, you should be done.
B. If motor powers close, you should use o/1 reversing switch on face of motor to reverse travel
C. If motor does not move damper, reverse wires 1 and 3.
What’s going on:
If you have a meter, you can check this-Here is what you are trying to do:
24vac power is being applied full time to motor terminals 1 and 2.
Switched power from one of the two existing damper outputs is switched to motor terminal 3. (sometimes the zone board schematic on inside cover will show this, and sometimes not)
Electrically, the same leg of zone control transformer that is on thermostat input R goes to motor terminal 2.
The other Leg of zone control transformer that is on Thermostat C goes to motor terminal 1.
Motor is diode protected and will not short 24vac system.
Above pic shows a typical example of a zone control board with just two damper outputs per zone (right side 11 22 33 44).
Note 24vac transformer input on upper left terminal, + and -