UPGRADE your system with an easier & better zoning control. The SmartZone-4X is a drop in replacement for many zone control systems. This is a quick diagram showing where to plug in the wires after disconnecting them from your old HONEYWELL system.
Honeywell HZ432, HZ-432, HZ322, HZ-322, HZ311, HZ-311, HZ221, HZ-221 can all be replaced by the SmartZone-4X in most cases. For more information go to http://www.smartzoning.com