Introduction
The Velleman VM148 is a versatile panel-mount thermostat module designed for both heating and cooling applications. It features an easy-to-read red LED display, direct manual temperature adjustment, and separate settings for output activation and deactivation. This manual provides essential information for the safe and effective use of your VM148 module.
Key Features:
- General purpose panel mount thermostat
- Usable for heating or cooling purposes
- Separate output-on and output-off setting
- Direct manual temperature adjustment
- Comes with easy board-to-wire connectors and sensor
- Bright red LED read-out
- Calibration option
- Under and overflow indication
Safety Information
Please read and understand all safety instructions before installing or operating the VM148 module. Failure to follow these instructions may result in electric shock, fire, or damage to the product.
- Electrical Safety: Ensure all power is disconnected before making any electrical connections. Installation should be performed by a qualified individual if you are unsure.
- Voltage: The module operates at 230 Volts. Verify your power source matches this requirement.
- Environment: Do not expose the module to moisture, extreme temperatures, or corrosive environments.
- Ventilation: Ensure adequate ventilation around the module to prevent overheating.
- Intended Use: Use the module only for its intended purpose as a thermostat.
Package Contents
Verify that all items are present in the package:
- 1 x Velleman VM148 Panel Thermostat Module with Red LED Read-Out
- 1 x Temperature Sensor
- Easy board-to-wire connectors
Product Overview
The VM148 module features a compact design for panel mounting, with a clear red LED display for temperature readings and control buttons for adjustments.
Figure 1: Front view of the VM148 module, showing the red LED display and control buttons for setting and calibration.
Figure 2: Rear view of the VM148 module, illustrating the circuit board layout, relay, and connection terminals for power input, temperature sensor, and controlled output.
Setup and Installation
1. Mounting:
The VM148 is designed for panel mounting. Cut an appropriate opening in your panel (refer to specifications for dimensions) and secure the module using the provided mounting hardware or clips.
2. Wiring Connections:
Refer to Figure 2 for the location of the wiring terminals. Ensure all power is OFF before making connections.
- Power Input: Connect the 230V AC power supply to the designated terminals (typically marked for AC input).
- Sensor Connection: Connect the temperature sensor to the "SENSOR" terminals. Ensure correct polarity if applicable (refer to sensor documentation).
- Output Connection: Connect the device to be controlled (e.g., heater, fan) to the "OUT" terminals. This is a relay output, so ensure the load's voltage and current ratings do not exceed the module's specifications.
Important: Always consult the detailed wiring diagram included with your specific VM148 product for precise connection points and safety guidelines. Incorrect wiring can damage the module or connected devices.
Operating Instructions
1. Power On:
Once wired, apply power to the module. The red LED display will illuminate, showing the current measured temperature.
2. Setting Temperature (Set Point):
- Press the SET button (often indicated by a wrench icon or similar) to enter setting mode. The display may flash or show the current set point.
- Use the UP (▲) and DOWN (▼) arrow buttons to adjust the desired temperature.
- Press SET again or wait a few seconds for the setting to be saved and the module to return to normal operation.
3. Output-On and Output-Off Settings:
The VM148 allows for separate "output-on" and "output-off" temperature settings, which defines the hysteresis (temperature differential) to prevent rapid cycling of the controlled device. Consult the specific product manual for the exact procedure to access and adjust these advanced settings, as button combinations can vary.
4. Calibration:
If the displayed temperature does not match a known accurate reference, the module can be calibrated. The calibration procedure typically involves entering a specific mode (often by holding a button) and adjusting the displayed value. Refer to the detailed instructions provided with your VM148 for the precise calibration steps.
Maintenance
The Velleman VM148 module requires minimal maintenance.
- Cleaning: Disconnect power before cleaning. Use a soft, dry cloth to wipe the display and casing. Do not use abrasive cleaners or solvents.
- Inspection: Periodically check wiring connections for tightness and signs of wear or damage.
- Sensor: Ensure the temperature sensor is clean and positioned correctly for accurate readings.
Troubleshooting
If you encounter issues with your VM148 module, refer to the table below for common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is off | No power supply; incorrect wiring. | Check power connections and ensure 230V AC is supplied. Verify wiring according to the manual. |
| Incorrect temperature reading | Faulty sensor; sensor not connected; calibration needed. | Check sensor connection. Replace sensor if damaged. Perform calibration as per operating instructions. |
| Output not activating/deactivating | Incorrect set point; wiring issue; faulty relay. | Verify set point and hysteresis settings. Check output wiring. If relay is suspected faulty, contact support. |
| "Under" or "Overflow" indication | Temperature outside sensor's range; sensor fault. | Ensure ambient temperature is within the sensor's operational range. Check sensor connection or replace sensor. |
Technical Specifications
| Feature | Specification |
|---|---|
| Model | VM148 |
| Brand | Velleman |
| Controller Type | Manual |
| Voltage | 230 Volts |
| Mounting Type | Panel Mount |
| Display | Red LED Read-Out, Backlight: Yes |
| Control Type | Button Control |
| Connectivity Protocol | Wi-Fi |
| Product Dimensions | 0.98 x 4.76 x 7.87 inches (2.49 x 12.09 x 19.99 cm) |
| Item Weight | 2.4 ounces (68 grams) |
| Material | Other (as per manufacturer) |
| Specific Uses For Product | Air Conditioner (general heating/cooling applications) |
Warranty Information
Velleman products are manufactured to high-quality standards. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Velleman website. Keep your proof of purchase for warranty claims.
Customer Support
If you have any questions, require technical assistance, or need to report a problem with your Velleman VM148 module, please contact Velleman customer support. Contact details can typically be found on the Velleman website or on the product packaging.
For the most up-to-date information and support resources, please visit the official Velleman website: www.velleman.eu
