ST799 - Temperature Controller HONEYWELL - Free user manual and instructions
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| Product Type | Temperature Controller |
| Brand | Honeywell |
| Model | ST799 |
| Control Type | Electronic, microprocessor-based |
| Display Type | Digital LCD with backlight |
| Temperature Range | 41°F to 95°F (5°C to 35°C) |
| Accuracy | ±1°F (±0.5°C) |
| Sensor Type | NTC thermistor |
| Power Supply | 24 VAC, 50/60 Hz |
| Power Consumption | 2 VA maximum |
| Relay Output | SPDT, 24 VAC, 1 A |
| Output Rating | 2 A inductive, 1 A resistive |
| Mounting Type | Wall mount or panel mount |
| Dimensions (H x W x D) | 4.5 x 3.5 x 1.2 in (114 x 89 x 30 mm) |
| Weight | 8 oz (227 g) |
| Housing Material | Flame-retardant ABS plastic |
| Operating Humidity | 5% to 95% RH, non-condensing |
| Certifications | UL, C-UL |
| Maintenance | Wipe with a soft, dry cloth; avoid solvents |
| Safety | Disconnect power before installation or servicing |
| Part Replacement | No user-serviceable parts; consult a qualified technician |
Frequently Asked Questions - ST799 HONEYWELL
How do I set the desired temperature on the Honeywell ST799?
Press the up and down arrows to adjust the setpoint. The display will show the current temperature, and while adjusting, the setpoint flashes. After a few seconds, the controller returns to showing the actual temperature.
What is the operating temperature range of the ST799?
The ST799 is designed to control temperatures between 5°C and 35°C (41°F to 95°F). If you need to control temperatures outside this range, consider a different controller model.
How do I clean and maintain the temperature controller?
Use a soft, dry cloth to wipe the exterior. Do not use water, cleaning sprays, or solvents, as they may damage the electronics. Clean the display and buttons gently to avoid scratches.
Can the Honeywell ST799 control both heating and cooling systems?
Yes, the ST799 has a single SPDT relay that can be wired for either heating or cooling. A jumper or wiring configuration allows you to select the mode. Always follow the wiring diagram in the installation instructions.
What kind of temperature sensor does the ST799 use?
The ST799 uses a built-in NTC thermistor sensor, which provides accurate temperature readings with a tolerance of ±0.5°C. The sensor is calibrated at the factory and does not require adjustment.
How do I mount the ST799 controller on the wall?
Remove the mounting base from the controller, position the base against the wall, mark the screw holes, and drill pilot holes. Insert the supplied anchors and screws, then snap the controller back onto the base. Ensure it is level for proper airflow.
My ST799 display is blank, what should I check?
Verify that 24 VAC power is present at the controller terminals. Check the circuit breaker and transformer. Also inspect the wiring connections for loose or corroded terminals. If power is correct and the display remains blank, the unit may require servicing.
Is the ST799 compatible with my heat pump system?
The ST799 is a basic temperature controller and does not include heat pump changeover logic. It can control a single heat or cool stage, but for heat pumps with auxiliary heat, you need a thermostat specifically designed for heat pumps.
Does the display have a backlight?
Yes, the ST799 features a backlit LCD display for easy reading in low-light conditions. The backlight can be set to always-on, or to light up only when a button is pressed, depending on the configuration.
How accurate is the temperature reading with the ST799?
The temperature sensor accuracy is ±1°F (±0.5°C) across the entire operating range. The controller samples the sensor every second and updates the display accordingly, ensuring a precise and responsive control.
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USER MANUAL ST799 HONEYWELL
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Product information
Brand : HONEYWELL
Model : ST799
Category : Temperature Controller