The option of One Zone Control - based off zone 1 thermostat - all dampers can open and close together.
Zone 4 can be used as a Fresh Air Damper system.
Outdoor Temperature Limit - In gas/electric or conventional heat pumps, second stage heating can be disabled when the outdoor temperature is higher than the temperature set by the ODT Limit potentiometer. Gas/Electric or Heat Pump Operation
Can use Heat/Cool or Heat Pump thermostat in Zone 1.
On board external emergency heat switch - allows the emergency heat to be activated even with a heat-cool only thermostat.
Cooling Limit Potentiometer - Sets the minimum supply air temperature allowed during cooling. If the temperature is exceeded, will be turned off and the indoor fan will continue to operate until the temperature rises above the limit.
- Controls 3-stage heat and 2-stage cool for regular gas/electric heat.
- Controls 2-stage heat and 2-stage cool for Heat Pumps.