Unitary Products Group 31
246681-YTG-B-0607
UERV has power, but the optional motorized fresh air
damper does not open.
1. Verify 24 volts to the A130 circuit board terminals
XFORMER "+" and "-".
2. Verify 24 volts to A130 circuit board terminals TB 37
numbers "1" and "3". Terminal "1" is the "hot" and "3" is
the "common" side of the power source from activation
power source (a/c unit, energy management control,
etc.). Typically, "1" would be from the blower contactor
on an a/c unit.
3. Verify 24 volts to B30 motorized outdoor air motor
through J/P160 plug assembly.
4. If all of the above are operational, replace the outdoor air
damper motor.
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