DUROZONE PANEL SELECTION GUIDE 
FOR STANDARD COOLING UNITS 
AND FURNACES

• Zone4 damper can be used as fresh air damper.  Timer on panel sets minutes of fresh air per hour.
• Compatible with automatic change-over thermostats allowing any zone to call for heating or cooling.
• Compatible with most 24VAC powered, battery powered thermostats.
• Two-stage heating and two-stage cooling for gas/electric systems and three stage heating and two stage cooling for heat pump systems.
• Optional supply air temperature sensor used to limit supply air temperature and prevent over-heating and freeze-up.
• Maximum and minimum supply air temperatures can be set on the panel.
• Optional purge cycle at the end of heating or cooling call.
• And more...

2 TO 4 ZONES

SMZ-2,3 & 4SW

• Manual Changeover
• 1 Stage Heat, 1 Stage Cool
• Zone Damper Switches
• Fan On / Auto

2 ZONES
2 TO 3 ZONES
2 TO 4 ZONES