Introduction
The KING HWP120 is an advanced electronic line voltage programmable thermostat designed specifically for hydronic heating systems. This thermostat offers precise temperature control and energy savings through its 7-day independent programming capabilities, allowing for up to four time and temperature settings per day. Its user-friendly design features an illuminated LCD display and simple two-button operation for setting temperature and navigating menus. The HWP120 is equipped with memory backup to retain settings during power outages, ensuring consistent comfort.
Figure 1: Angled view of the KING HWP120 Electronic Line Voltage Programmable Hydronic System Thermostat, showing its white casing and green illuminated LCD display.
Safety Information
WARNING: To prevent electric shock or damage to the thermostat, disconnect power to the heating system at the main fuse or circuit breaker box before installation or servicing. This thermostat operates on line voltage (120V/240V) and requires careful handling. Installation should only be performed by a qualified electrician in accordance with local electrical codes.
- Always turn off power at the circuit breaker before working with electrical wiring.
- Ensure all wiring connections are secure and properly insulated.
- Do not exceed the specified electrical ratings of the thermostat (12.5 amps / 120 volts, 3000 watts / 240 volts).
- Keep the thermostat away from water and excessive humidity.
Installation and Setup
Proper installation is crucial for the safe and efficient operation of your HWP120 thermostat. It is recommended that a licensed electrician perform the installation.
Mounting Location
Choose a location on an interior wall, approximately 5 feet (1.5 meters) above the floor, away from direct sunlight, drafts, or heat sources (e.g., lamps, appliances, fireplaces). These factors can affect the thermostat's temperature readings.
Wiring Instructions
- Disconnect Power: Turn off the power to your heating system at the main circuit breaker. Verify power is off before proceeding.
- Remove Old Thermostat: Carefully remove your existing thermostat from the wall. Note the wiring connections.
- Connect Wiring: Connect the wires from your heating system to the appropriate terminals on the HWP120 thermostat. Refer to the wiring diagram provided with your thermostat's packaging for specific connections. Ensure all connections are tight.
- Mount Thermostat: Secure the HWP120 thermostat to the wall using the provided mounting screws.
- Restore Power: Once installation is complete and all connections are secure, restore power at the circuit breaker.
Figure 2: Front view of the KING HWP120 Thermostat, highlighting the LCD display and the two control buttons below it.
Operating Instructions
The HWP120 thermostat is designed for straightforward operation using its two primary buttons and illuminated LCD display.
Display Overview
The LCD display shows the current room temperature, the set temperature, the time, day of the week, and the active program period (P1, P2, P3, P4). When the heating system is active, a "HEAT" indicator will typically be visible.
Figure 3: Side angled view of the KING HWP120 Thermostat, showing the ventilation grilles on the side and the clear display.
Adjusting Temperature Manually
To temporarily adjust the temperature, press the Up (▲) or Down (▼) buttons. The display will show the new set temperature. This manual override will typically remain active until the next programmed period begins.
Setting Time and Day
Refer to the detailed programming section for initial setup of time and day, as these are integral to the programming functions.
Programming Instructions
The HWP120 allows for 7 independent day programming with 4 times and temperature settings (P1, P2, P3, P4) per day. This feature helps optimize energy consumption by adjusting heating based on your schedule.
Entering Programming Mode
To enter programming mode, press and hold both the Up (▲) and Down (▼) buttons simultaneously for a few seconds until the display changes to indicate programming mode (e.g., flashing time or day).
Setting Time and Day
- In programming mode, the hour will typically flash. Use the Up or Down buttons to adjust the hour.
- Press one of the buttons (e.g., Up or Down, depending on the model's specific navigation) to advance to minutes, then adjust.
- Continue to advance to set the day of the week.
Setting Program Periods (P1-P4)
For each day of the week, you can set four distinct periods:
- P1 (Wake): Typically for morning, when you wake up.
- P2 (Leave): For when you leave home.
- P3 (Return): For when you return home.
- P4 (Sleep): For nighttime.
- While in programming mode, navigate to the desired day (e.g., Monday).
- Select P1. Set the desired start time and temperature for P1 using the Up or Down buttons.
- Advance to P2 and repeat the process for its start time and temperature.
- Continue for P3 and P4.
- Repeat this process for each day of the week (Tuesday through Sunday).
- Exiting Programming Mode: Once all settings are complete, the thermostat will typically exit programming mode automatically after a period of inactivity, or you may need to press and hold the buttons again to save and exit. Consult the full manual for specific exit procedures.
Important Note: The HWP120 thermostat initiates heating at the programmed time to reach the set temperature. It does not anticipate heating. Therefore, if you desire a room to be at a specific temperature by a certain time, set the program to begin heating approximately 15-30 minutes prior to that desired time, depending on your system's response time.
Maintenance
The KING HWP120 thermostat requires minimal maintenance to ensure optimal performance.
- Cleaning: Periodically wipe the exterior of the thermostat with a soft, damp cloth. Do not use abrasive cleaners or solvents, as these can damage the finish or internal components.
- Dust Removal: Ensure the ventilation slots on the thermostat casing remain clear of dust and debris to allow for proper air circulation and accurate temperature sensing.
- Power Outage: The thermostat features memory backup for power outages, retaining your programmed settings. No action is typically required after a power restoration.
Troubleshooting
If you encounter issues with your HWP120 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 wiring connections. |
| Heating system not turning on/off as programmed. | Incorrect programming; manual override active; system malfunction. | Review your program settings carefully. Ensure no manual override is active. Check your heating system for other issues. |
| Room temperature inaccurate. | Thermostat location affected by drafts or heat sources. | Ensure the thermostat is not exposed to direct sunlight, drafts from windows/doors, or heat from appliances. |
| Difficulty programming. | Unfamiliarity with programming sequence. | Carefully re-read the "Programming Instructions" section. Practice the steps without making permanent changes. |
If problems persist after attempting these solutions, contact a qualified electrician or KING customer support for assistance.
Specifications
| Feature | Detail |
|---|---|
| Model Name | HWP120 |
| Brand | KING |
| Voltage | 120 Volts / 240 Volts |
| Amperage | 12.5 amps (120V) / 12.5 amps (240V) |
| Wattage | 1500 watts (120V) / 3000 watts (240V) |
| Temperature Range | 44°F to 95°F (7°C to 35°C) |
| Accuracy | ± 1.2°F @ 10 amps, ± .9°F @ 4.2 amps |
| Programming | 7 independent day programming with 4 times and temperature settings per day |
| Display Type | Digital, Illuminated LCD |
| Control Type | Push Button |
| Material | Plastic |
| Dimensions (L x W x H) | 4.88 x 3.13 x 2 inches |
| Item Weight | 10.4 ounces |
Warranty and Support
Warranty Information
The KING HWP120 Electronic Line Voltage Programmable 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. For specific terms and conditions, please refer to the warranty documentation included with your product or visit the manufacturer's official website.
Customer Support
For technical assistance, troubleshooting beyond this manual, or warranty claims, please contact KING customer support. You can typically find contact information (phone number, email, or support portal) on the manufacturer's website or in the product packaging.
It is recommended to have your product model number (HWP120) and date of purchase available when contacting support.
