FHT-2DA - Temperature regulator Vemer - Free user manual and instructions
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| Product Type | Temperature Regulator (Thermostat) |
| Brand | Vemer |
| Model | FHT-2DA |
| Application | Heating and cooling systems |
| Display Type | LCD with clear digits |
| Program Capacity | Up to 4 time programs per day |
| Temperature Range | 5 °C to 40 °C |
| Accuracy | ±0.5 °C |
| Switching Differential | 0.1 °C |
| Switching Capacity | Resistive load 16 A / 250 V AC |
| Power Supply | 2 x 1.5 V AA batteries |
| Battery Life | Approximately 1 year under normal use |
| Dimensions (W x H x D) | 120 x 80 x 25 mm |
| Weight | 150 g (including batteries) |
| Mounting | Wall mounting with screws or adhesive |
| Operating Modes | Auto, manual, off |
| Key Features | Adjustable hysteresis, air/floor sensor input |
| Cleaning | Wipe with soft dry cloth |
| Safety | High voltage protection, flame retardant housing |
| Spare Parts | Batteries are replaceable; other parts serviceable |
| Certifications | CE compliant |
| Package Contents | Thermostat, screw set, instruction manual |
Frequently Asked Questions - FHT-2DA Vemer
How do I change the batteries in my Vemer FHT-2DA thermostat?
To change the batteries, gently remove the front cover, take out the old AA batteries, and insert new ones observing the polarity markings. Reattach the cover and the thermostat will resume operation.
Can the FHT-2DA be used for both heating and cooling?
Yes, the FHT-2DA supports both heating and cooling modes. Use the mode selection to switch between auto, heat, and cool based on your system.
How do I set a weekly program on the thermostat?
The FHT-2DA allows setting up to 4 time periods per day. Press the program button, then use the arrow keys to adjust the time and temperature for each period. Confirm each setting with the OK button.
What is the hysteresis and how do I adjust it?
Hysteresis is the temperature difference between when the relay activates and deactivates. You can set it from 0.1 to 2 °C in the advanced settings menu. This prevents rapid cycling of your heating or cooling system.
The display is showing a low battery symbol. How much time do I have to replace the batteries?
Once the low battery symbol appears, you typically have a few weeks before the thermostat stops controlling the system. Replace the batteries soon to ensure uninterrupted operation.
Can I connect an external floor sensor to the FHT-2DA?
Yes, the FHT-2DA has a sensor input. You can connect an optional floor sensor to monitor and control based on floor temperature. Follow the wiring diagram in the manual.
What does the manual mode do?
Manual mode overrides any program and keeps the set temperature fixed until you change it or switch modes. It is useful for temporary comfort adjustments.
The thermostat is not switching the system on. What could be wrong?
First, check that the temperature is set above room temperature in heating mode. Then verify the batteries and that the backplate wires are connected correctly. Also ensure the mode is not set to Off.
Is the thermostat suitable for high-current loads?
The FHT-2DA can handle up to 16 A resistive load. For inductive loads like motors, it is recommended to use a contactor to avoid overloading the relay.
How do I reset the thermostat to factory defaults?
To reset, press and hold the Reset button (located near the battery compartment) for 3 seconds. This will restore all settings to factory defaults and clear any custom programs.
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USER MANUAL FHT-2DA Vemer
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Product information
Brand : Vemer
Model : FHT-2DA
Category : Temperature regulator