Does this restrict me further, or open up more options? I have an order out for 2 Pro4000's, assuming they will still work.
Changing the thermostats to Pro4000's will open up more options in your case.
You will no longer need to use that master selector switch to choose between Heat-Off-Cool.
The Zone One thermostat will now have the capability to control this.
If you would like to continue to use the master selector switch you can simply leave it as it is and replace the thermostat wire for wire.
If you would like to eliminate the master selector switch you will want to wire the "O" and "B" from the Zone One thermostat terminals on the zone panel to the "O" and "B" terminals on the new Pro4000 thermostat.
If you have any further questions on this process, please give our Tech Support Line a call at 800-446-3110.