This kit includes:
(1) W8835A1004 Envirazone Zone Panel (3H/2C)
(1)VisionPro IAQ Thermostat (1)FocusPRO IAQ Thermostat
(1) AT140A Transformer
(1) C7089U1006 Outdoor Temperature Interface Module (1) 50022037
HVAC systems with 3 or more zones should be equipped with a pressure relief bypass duct to prevent over pressure buildup that may damage the system. This duct is installed just ahead of the blower. It opens and redirects some of the airflow back into the blower intake when pressure builds up due to many dampers being closed. This mechanical bypass duct is is continuously variable and the pressure relief level is easily adjustable.
