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How many additional zones does a Honeywell 4219 provide?

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The Honeywell 4219 Hardwired Zone Expander provides and additional 8 hardwired zones per expander board. Most Vista systems that we offer on the site can deliver anywhere from 22-48 hardwired zones, but only start out with between 6-8 hardwired zones.

You will need to use a 4219 if you plan on having more hardwired zones than the main control board provides.