|Onboard No/Type of Inputs / Outputs||4 inputs, 4 outputs|
|Electrical Specifications||Voltage: 24 V AC|
Power Consumption: 20 VA
|Physical Specifications||Dimensions mm: 139 x 207 x 62|
Weight g: 500
|Environmental Specifications||Operating Temp oC: 0 ~ 49|
Operating Humidity %: 10 ~ 95
The b3850 is designed for single-duct VAV applications, with four universal inputs plus an on-board air flow sensor. The b3851 contains four Universal inputs as well, but does not have the on-board air flow sensor and is perfect for applications such as heat pumps and fan coils. The b3853 is for dual-duct VAV applications. It contains two on-board airflow sensors and four universal inputs.