1. Introduction
Thank you for choosing the Cyrank HYO6BW Digital LCD Programmable Thermostat Temperature Controller. This device is designed to provide precise temperature control for your home or office, offering both heating and cooling output options. Its large LCD display and programmable features ensure a comfortable and energy-efficient environment. This manual provides detailed instructions for installation, operation, and maintenance.
2. Safety Information
- Read all instructions carefully before installation and operation.
- Installation should be performed by a qualified professional to ensure proper wiring and safety.
- Ensure the power supply is disconnected before performing any wiring or maintenance.
- Use only 2 AA alkaline batteries for power. Do not mix old and new batteries, or different types of batteries.
- Do not expose the device to water or excessive humidity.
- Keep out of reach of children.
3. Package Contents
Verify that all items are present in the package:
- 1 x Cyrank HYO6BW Temperature Controller
- 1 x User Manual
- 2 x Mounting Screws

Figure 3.1: Package contents including the thermostat, user manual, and mounting screws.
4. Product Overview
The Cyrank HYO6BW thermostat features a modern design with a large LCD display for clear visibility of temperature, time, and operating mode. It is designed for single heating or single cooling output control.
4.1 Key Features
- Large LCD Display: Easy to read, even in low light conditions, showing current room temperature, set temperature, time, and operating mode.
- Single Touch Output: Supports either heating or cooling output, selectable via simple operations.
- Precise Temperature Control: Achieves accurate temperature regulation with a switching temperature difference of 0.5℃.
- Programmable Functionality: Allows setting a weekly program for automated temperature adjustments.
- Elegant Design: Simple and modern appearance with a user-friendly operating interface.

Figure 4.1: Front view of the Cyrank HYO6BW Temperature Controller.

Figure 4.2: Detailed view of the LCD display showing operational information.

Figure 4.3: Rear view of the thermostat with wiring terminals.
5. Installation
5.1 Battery Installation
The thermostat requires two AA alkaline batteries (not included) for operation.
- Gently open the battery compartment cover located on the back of the thermostat.
- Insert two AA alkaline batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
5.2 Mounting
The thermostat can be wall-mounted or placed on a battery seat.
- Choose a suitable location on an interior wall, away from direct sunlight, drafts, or heat sources that could affect temperature readings.
- If wall-mounting, use the provided screws to secure the thermostat to the wall.
- Ensure the thermostat is level and securely fastened.
5.3 Wiring
Warning: Wiring should only be performed by a qualified electrician to prevent electrical shock or damage to the unit. Refer to the wiring diagram on the back of the thermostat or in the included manual for specific connections. The thermostat provides switch relay output for connection to your heating or cooling system.

Figure 5.1: Rear view of the thermostat showing wiring terminals.
6. Operating Instructions
The thermostat features a rotary press key and a few simple buttons for operation.

Figure 6.1: Excerpt from the manual showing operation keys and main setting screen details.
6.1 Key Functions
- Rotary Press Key (A): Rotate clockwise to increase settings (e.g., temperature).
- Rotary Press Key (B): Rotate anti-clockwise to decrease settings (e.g., temperature).
- Press Key (B): Short press to switch between Auto and Manual modes. Long press for 3 seconds to enter the setting interface.
- Press Key (C): Power on/off key. Long press for 3 seconds to activate/deactivate child lock.
6.2 Basic Operation
- Power On/Off: Press and hold key C to turn the thermostat on or off.
- Mode Selection: Short press key B to toggle between Automatic and Manual operating modes. In Automatic mode, the thermostat follows the programmed schedule. In Manual mode, it maintains the set temperature until changed.
- Setting Temperature: In Manual mode, rotate the Rotary Press Key (A for increase, B for decrease) to adjust the desired temperature. The new setting will be displayed and applied.
6.3 Programmable Settings
The thermostat supports a weekly programming cycle. To access and configure the programmable settings:
- Long press key B for 3 seconds to enter the setting interface.
- Follow the on-screen prompts and use the rotary press key to navigate and adjust parameters for each day of the week and time periods.
- Confirm settings by pressing the appropriate key as indicated on the screen.
6.4 Child Lock
To prevent unintended changes, you can activate the child lock feature by long pressing key C for 3 seconds. Repeat the action to deactivate the child lock.
7. Maintenance
- Cleaning: Wipe the thermostat's exterior with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Battery Replacement: Replace batteries when the low battery indicator appears on the display. Ensure to use fresh AA alkaline batteries.
- Avoid Obstructions: Ensure no objects block the thermostat's vents or sensors, as this can affect temperature readings.
8. Troubleshooting
- No Display: Check if batteries are correctly installed and have sufficient charge. Replace if necessary.
- Incorrect Temperature Reading: Ensure the thermostat is not exposed to direct sunlight, drafts, or heat sources. Verify the sensor is clean and unobstructed.
- System Not Responding (Heating/Cooling): Check wiring connections. Ensure the thermostat is in the correct operating mode (heating or cooling) and the set temperature is appropriate.
- Unable to Change Settings: Check if child lock is activated. Deactivate by long pressing key C for 3 seconds.
9. Specifications
| Feature | Specification |
|---|---|
| Power | 2 x AA alkaline batteries (not included) |
| Display Accuracy | 0.5℃ or 1°F |
| Probe Sensor | NTC(10k)1% |
| Contact Capacity | 5A |
| Working Environment Temperature | 0~50°C / 32~122°F |
| Temperature Control Range | 5 ~ 35°C / 41~95°F |
| Temperature Display Range | 0 ~ 40°C / 32~99°F |
| Output | Switch relay |
| Insulating Condition | Normal environment |
| Running Program | Set per 1 week as a cycle |
| Installation | Wall mounted or on battery seat |
| Size | 8.5 x 8.5 cm / 3.35 x 3.35 inches |
| Weight | 165g / 6 ounces |
10. Warranty and Support
For warranty information or technical support, please refer to the documentation provided with your purchase or contact your retailer. Keep your proof of purchase for any warranty claims.