Description
The Braeburn 4235 is a universal 3 heat / 2 cool thermostat that adds full scheduling, humidity control, and a big 4.4″ backlit screen to multi-stage and heat pump systems. It’s built for jobs where you want one stat to handle staging, dehumidification, and commercial-style features like dry contact and pre-occupancy purge without a lot of extra hardware.
Key Features & Benefits
Built-In Humidity Control
Provides auto or manual humidification control plus dehumidification with over-cooling, and can drive an external humidifier or dehumidifier or use the cooling system to reduce humidity.
Multi-Function Dry Contact Input
Dry contact input can be configured for occupancy control, condensate monitoring, or door switch activation—handy for light commercial and higher-end residential jobs.
Auto Or Manual Changeover
Supports automatic or manual changeover between heating and cooling, with residential or commercial modes available.
SmartLimit Temperature Limits
SmartLimit® temperature limits with installer lock help prevent extreme setpoints and unwanted changes.
Remote Sensor Ready
Supports indoor or outdoor remote sensing (with optional sensors) for temperature display and control flexibility.
Programmable And Circulating Fan Modes
Offers programmable fan and circulating fan modes, plus residual cooling fan delay to help manage airflow and comfort.
Adaptive Recovery Mode
Adaptive Recovery Mode (ARM™) learns system response and starts early so spaces hit the programmed setpoint at the scheduled time.
Pre-Occupancy Purge Option
Pre-occupancy purge cycles the fan and system before people arrive, useful for freshening air in commercial or office applications.
Aux Heat Fossil Fuel Option
Auxiliary heat fossil fuel option lets you configure how backup heat is staged in dual-fuel applications.
User/Installer Lock And Keypad Lockout
Separate user and installer setup modes, multi-level keypad lockout, and lockable overrides support tighter control in residential or commercial spaces.
Filter, UV, And Pad Check Monitors
Built-in filter, UV lamp, and humidifier pad check timers provide simple maintenance reminders.
Key Specs
Application: Universal programmable thermostat with dry contact and humidity control
Staging (Heat Pump): Up to 3 Heat / 2 Cool
Staging (Conventional): Up to 2 Heat / 2 Cool
Programming Modes: 7-Day, 5-2 Day, or Non-Programmable
Display Size: 4.4 sq. in. adjustable bright blue backlit LCD
System Compatibility: Low-voltage single or multi-stage gas, oil, electric; single or multi-stage heat pumps with aux heat; 250–750 mV heating; 2- or 3-wire hydronic zone systems
Humidity Control: Humidification and dehumidification (with over-cooling), 10–50% RH (humidify) and 40–80% RH (dehumidify)
Dry Contact Terminals: DRY1 / DRY2 multi-function dry contact input
Terminals: Rc, Rh, W1/E, W2/AUX, Y1, Y2, G, O/B/V3, C, L, H/D, S1, S2, DRY1, DRY2
Power: 24 VAC (18–30 VAC) and/or 3.0 VDC from two AA alkaline batteries
Electrical Rating: 24 VAC; 1 A max load per terminal; 7 A total max (all terminals)
Control Range: 45–90°F (7–32°C)
Display Range: 35–99°F (1.5–37°C)
Temperature Accuracy: ±1°F (±0.5°C)
Temperature Differential: 0.5°, 1°, or 2°F (0.2°, 0.5°, or 1°C)
Operating Humidity: 5–95% RH, non-condensing
Dimensions: 4.25″ × 5.12″ × 1.0″
