Maybe something like
powering the pump when any of zones 1-4 are active. You’d use a 24 VDC relay, with the resistor chosen to provide about 24 V to the coil.
Maybe something like
powering the pump when any of zones 1-4 are active. You’d use a 24 VDC relay, with the resistor chosen to provide about 24 V to the coil.