Honeywell Thermostat: TH8320R & TH8321R VisionPro

Re: HUMIDITY CONTROL

The primary difference between the TH8320R and the TH8321R is humidity control.

• The TH8321R has a built-in humidity sensor and two U1 terminals to control either Humidification or De-Humidification (one or the other) directly from the thermostat.
• In order to control humidity with a TH8320R you must add the following REDLink accessories:
  • Wireless Indoor Sensor - which will provide a remote temperature and humidity reading.
  • Equipment Interface Module

► Before using the thermostat to control humidity, it must be configured for either Humidification or De-Humidification.