HW120 - Thermostats KING - Free user manual and instructions
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| Product Type | Thermostat |
| Brand | King |
| Model | HW120 |
| Dimensions (approx.) | 4.8 x 3.5 x 1.2 inches (122 x 89 x 30 mm) |
| Weight (approx.) | 0.3 lbs (136 g) |
| Power Source | 24 VAC or 2 AA batteries (depending on installation) |
| Temperature Range | 40°F to 90°F (4°C to 32°C) |
| Control Type | Digital programmable |
| Display | LCD with backlight |
| Heating/Cooling Modes | Heat, Cool, Auto, Off |
| Programmable Schedules | 7-day, 4 periods per day |
| Compatibility | Most single-stage heat/cool systems (gas, electric, heat pump) |
| Installation | Wall mount, requires wiring (C-wire optional) |
| Cleaning | Wipe with a soft, dry cloth; avoid liquids |
| Safety Features | Overheat protection, compressor short-cycle protection |
| Spare Parts | Batteries, wall plate, screws (included) |
| General Information | Energy-saving thermostat with easy-to-use interface |
Frequently Asked Questions - HW120 KING
How do I install the King HW120 thermostat?
Turn off power to your HVAC system. Remove the old thermostat, label wires, and connect them to the corresponding terminals on the HW120. Mount the base plate, attach the thermostat, and restore power. Refer to the manual for specific wiring diagrams.
Is the HW120 compatible with my heat pump?
Yes, the HW120 supports single-stage heat pump systems. Ensure your system uses standard color-coded wires (e.g., R, W, Y, G, O/B). For heat pumps with auxiliary heat, a C-wire is recommended.
How do I set a programmable schedule?
Press the 'Schedule' button, then select the day. Use the arrow keys to set the time and temperature for each period (Wake, Leave, Return, Sleep). Press 'Save' to confirm. Repeat for other days or copy one day to all.
What does the battery low indicator mean?
When the battery icon flashes, replace both AA batteries within 30 days to avoid losing settings. Use alkaline batteries for best performance.
My thermostat shows 'Heat On' but no warm air. What's wrong?
Check if the system is set to 'Heat' and the temperature set point is above room temperature. Verify the furnace or heat pump is powered on. If using a heat pump, ensure the O/B terminal is wired correctly.
Can I use the HW120 without a C-wire?
Yes, the HW120 can operate on batteries alone for thermostats that do not require continuous 24V power. However, for heat pumps or systems requiring a common wire, a C-wire is recommended for stable operation.
How do I reset the thermostat to factory settings?
Press and hold the 'Reset' button located on the side or back of the unit for 5 seconds until the display clears. This will erase all programmed schedules and restore defaults.
What is the temperature accuracy of the HW120?
The thermostat maintains a temperature accuracy of ±1°F (±0.5°C) under normal conditions. It uses a built-in sensor and calibrates automatically.
How do I enable the backlight?
Press any button to activate the backlight. It stays on for 10 seconds after the last button press. Some models have a continuous backlight option accessible via settings.
My thermostat displays 'Err' or 'E1'. What does it mean?
'Err' indicates a sensor fault. Try power cycling the thermostat by removing batteries or turning off the HVAC breaker for 1 minute. If the error persists, the thermostat may need replacement. 'E1' often means communication error; check wiring connections.
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USER MANUAL HW120 KING
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Product information
Brand : KING
Model : HW120
Category : Thermostats