Product Overview
The King Electric HW120 is an electronic line voltage thermostat specifically designed for hydronic coil heating systems. It provides precise control over two circuits, typically managing a circulation pump and a fan. This design addresses the challenges of traditional bi-metal thermostats in hydronic systems, ensuring accurate temperature regulation and efficient operation by properly shutting off when not needed, thereby preventing unnecessary hot water circulation.
This thermostat is engineered to deliver superior comfort control and contribute to energy savings in hydronic heating applications.
Figure 1: Front view of the HW120 thermostat with its digital display.
Key Features
- Electronic Temperature Sensing: Utilizes advanced electronic sensing for highly accurate temperature control.
- Dual Circuit Control: Manages two independent circuits, ideal for hydronic systems with a pump and fan.
- Energy Efficiency: Designed to optimize heating system performance, potentially saving up to 15% on heating costs.
- Wide Temperature Range: Operates within a range of 40°F to 95°F (4°C to 35°C).
- Digital Display: Features a clear digital display for easy temperature reading and setting.
- Backlight: Equipped with a backlight for improved visibility in various lighting conditions.
- Touch Control: User-friendly touch interface for adjustments.
Specifications
| Attribute | Detail |
|---|---|
| Model Name | HW120 |
| Brand | KING |
| Controller Type | Digital |
| Special Feature | Zoned Heating/Cooling Control |
| Color | White |
| Specific Uses | Hydronic Heating Systems |
| Temperature Control Type | Heating |
| Included Components | Thermostat |
| Power Source | Electric |
| Voltage | 120 Volts / 12.5 Amps (also listed as 240 Volts, verify compatibility with your system) |
| Wattage | 3000 watts |
| Accuracy | ± 1.2°F @ 10amps, ± .9°F @ 4.2amps |
| Material | Plastic |
| Shape | Rectangular |
| Display Type | Digital |
| Control Method | Touch |
| Mounting Type | Wall Mount |
| Item Weight | 0.6 Pounds (approx. 9.6 ounces) |
| Product Dimensions | 4.88 x 3.13 x 2 inches |
| UPC | 093319190487 |
Note: The product specifications list both 120V and 240V. Please ensure the thermostat's voltage matches your heating system's requirements before installation.
Setup and Installation
Installation of the King Electric HW120 thermostat involves working with line voltage electrical wiring. For safety and proper functionality, it is highly recommended that installation be performed by a qualified electrician or HVAC professional.
Pre-Installation Checklist:
- Verify that the power supply to the heating system is turned off at the circuit breaker before beginning any work.
- Confirm that the thermostat's voltage (120V or 240V) matches your system's requirements.
- Ensure you have the necessary tools: screwdriver set, wire strippers, electrical tape, and a voltage tester.
- Read all instructions thoroughly before proceeding.
Mounting:
The HW120 is designed for wall mounting. Choose a location on an interior wall, away from direct sunlight, drafts, or heat sources that could affect temperature readings. The ideal height is typically 5 feet (1.5 meters) from the floor.
Figure 2: Front view of the HW120, highlighting the display and control interface.
Wiring:
Follow the wiring diagram provided with your thermostat packaging. Connect the line voltage wires to the appropriate terminals. Ensure all connections are secure and insulated. The thermostat controls two circuits, so proper identification and connection of the pump and fan wires are crucial.
After wiring, carefully secure the thermostat to the wall plate and restore power to the system.
Operating Instructions
The HW120 thermostat features a digital display and touch controls for easy operation.
Setting the Temperature:
- The current room temperature is typically displayed on the main screen.
- To adjust the desired temperature, use the Up (▲) and Down (▼) arrow buttons located below the display.
- Pressing these buttons will cause the set temperature to flash, indicating it is ready for adjustment.
- Continue pressing the arrows until your desired temperature is reached. The thermostat will automatically save the setting after a few seconds of inactivity.
Figure 3: Angled view of the HW120, showing its compact design.
Understanding the Display:
- The large numbers indicate the current or set temperature.
- A small indicator light or icon may illuminate to show when the heating system is active.
- Refer to the specific icons and indicators in the detailed manual that came with your product for full understanding.
Power/Mode Switch (if applicable):
Some models may feature a small switch on the bottom or side for power on/off or mode selection (e.g., Heat/Off). Familiarize yourself with its position and function. Ensure it is set to the "Heat" position for heating operation.
Maintenance
The King Electric HW120 thermostat requires minimal maintenance to ensure optimal performance and longevity.
- Cleaning: Periodically wipe the thermostat's exterior with a soft, damp cloth. Do not use abrasive cleaners or solvents, as these can damage the plastic casing or display.
- Airflow: Ensure that the vents on the thermostat casing are not obstructed by dust or debris. Proper airflow is essential for accurate temperature sensing.
- Power Cycle: If the thermostat appears unresponsive, try turning off the power to the heating system at the circuit breaker for a few minutes, then restoring it. This can sometimes resolve minor electronic glitches.
No user-serviceable parts are inside the thermostat. Do not attempt to open the unit.
Troubleshooting
If you encounter issues with your King Electric HW120 thermostat, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Thermostat display is blank. | No power to the thermostat. | Check the circuit breaker for your heating system. Ensure it is in the "ON" position. Verify proper wiring connections. |
| Heating system not turning on. | Temperature set too low; thermostat in "Off" mode; wiring issue. | Increase the set temperature above the current room temperature. Check for a power/mode switch and ensure it is set to "Heat". Verify wiring connections are secure. |
| Thermostat not shutting off properly / continuously circulating hot water. | Incorrect wiring or system incompatibility; internal thermostat issue. | This thermostat is designed to prevent this issue. Re-verify wiring according to the diagram. If the problem persists, contact a qualified electrician or King Electric support. |
| Temperature readings seem inaccurate. | Thermostat location affected by drafts, direct sunlight, or heat sources; obstructed vents. | Ensure the thermostat is not exposed to external influences. Clean any dust or debris from the thermostat's vents. |
| Buttons are unresponsive. | Temporary electronic glitch; physical damage. | Perform a power cycle (turn off power at breaker, wait 1 minute, turn back on). If unresponsive after power cycle, contact support. |
For issues not listed here or if troubleshooting steps do not resolve the problem, please contact King Electric customer support or a certified HVAC technician.
Warranty Information
The King Electric HW120 Electronic Line Voltage Hydronic System Thermostat comes with a 1-year limited warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use and service.
For warranty claims or detailed terms and conditions, please retain your proof of purchase and contact King Electric customer support. The warranty does not cover damage resulting from improper installation, misuse, abuse, accident, or unauthorized repairs.
Customer Support
For further assistance, technical support, or inquiries regarding your King Electric HW120 thermostat, please visit the official King Electric website or contact their customer service department.
Manufacturer: King Electric
Please refer to the packaging or the manufacturer's official website for the most current contact information.
