We have one thermostat in the garage on one zone and one thermostat in the house for the other garage zone. It was intended to put up a wall to seperate the zones but it won’ t happen for awhile can we run both zones off of the thermostat in the garage they are 6watts @24v ac. If we don’t the garage zone always runs and the one in the house never runs.
whichever zone valve you want to slave to the other, disconnect the wires so you don’t burn out the end switch ( label them so you can put them back later) and use the manuel override lever to open the valve
If you run the power required to operate two zone valves through one thermostat you are on the margin of burning the anticipator or thermostat circuit.
With some tricky rewiring, you can run the second ‘slave’ zone valve motor off the end switch of another zone valve as is done with some of the 5-wire White-Rodgers zone valves. You would use the ‘end switch of the zone valve operated by the thermostat’ as a thermostat (which is a fancy switch) to the ‘slave’ zone valve motor. As it is a tricky wiring, you have to get it right the first time.