Sunster A2422 Wireless Temperature Sensing Switch with CO Monitoring

1. Introduction

The Sunster A2422 is an advanced wireless temperature sensing switch designed for enhanced safety and convenience with your diesel air heater. It integrates carbon monoxide (CO) monitoring, ambient temperature detection, and remote control capabilities, making it ideal for various applications including home, car, RV, camping, and more. This device ensures a safer environment by providing CO alarms and automatic heater shutdown in case of unsafe CO levels.

2. Key Features

• Wireless Remote Control: Control your heater switch, adjust operating modes, parameters, and functions remotely via Bluetooth.
• Built-in Temperature Sensor: Accurately detects current ambient temperature.
• CO Detection Function: Monitors carbon monoxide concentration, triggers an alarm, and can automatically shut down the heater if CO levels exceed safe limits.
• Temperature Unit Switching: Easily switch between Celsius (°C) and Fahrenheit (°F).
• Temperature Compensation: Adjustable temperature compensation from -9°C to +9°C (default 0°C).
• Time Display: Shows current time and synchronizes with the heater switch when connected.
• Backlight Control: Adjustable automatic off time for the backlight (0 to 60 seconds).
• Battery Level Display: Indicates the current battery level.
• Voice Announcement: Provides beep sounds for alerts.

Figure 1: Key features of the A2422 Wireless Temperature Sensing Switch.

3. Package Contents

Please check the package for the following items:

• Sunster A2422 Wireless Temperature Sensing Switch
• User Manual (this document)

Note: 3 x 1.5V AAA batteries are NOT included and must be purchased separately.

4. Specifications

Figure 2: Approximate dimensions of the A2422 device.

5. Setup

5.1 Battery Installation

1. Locate the battery compartment on the back of the A2422 device.
2. Open the battery cover.
3. Insert three (3) 1.5V AAA batteries, ensuring correct polarity (+/-).
4. Close the battery cover securely.

Figure 3: Back view of the A2422 with battery compartment.

5.2 Switch Matching (Pairing)

To enable wireless control, the A2422 must be paired with your heater switch.

1. Ensure the A2422 is in a shutdown state.
2. Long press the [Add button] on the A2422. The Bluetooth icon will flash, indicating it's waiting for a match.
3. On your heater switch, turn on its matching mode. This usually involves pressing and holding the [power button] and [right button] simultaneously.
4. The heater switch screen will display "ADD -> SUC" (Add -> Success), confirming a successful match.
5. The A2422 will automatically exit matching mode after 10 seconds, or you can press the power button to exit manually.

6. Operating Instructions

6.1 Power On/Off

1. Power On: Long press the [power button] for 2 seconds. After successful matching, the heater switch status will be displayed.
2. Power Off: In running state, press the [power button] to switch off the heater.

6.2 Mode Switching

After waking up the switch by pressing the [power button]:

1. Press the [Settings Key] to cycle through modes.
2. Available modes:
• LEU (Level): Gear mode.
• TEP (Temp): Temperature control mode.
• AUT (Auto): Constant temperature mode.
• SUP (Supper Plus): Intense heat mode (applicable to some motherboards).
• FAN: Ventilation mode (applicable to some motherboards).

Figure 4: Visual guide to operating mode switching.

6.3 Parameter Adjustment

In running state, press the [Increase/Decrease button] to adjust parameters. Parameters can be adjusted differently depending on the mode:

• Adjust gear in gear mode and ventilation mode.
• Adjust the setting temperature in temperature control mode and constant temperature mode.

6.4 Viewing Carbon Monoxide (CO) and Current Time

In power-on state:

1. Long press the [Decrease button] to check carbon monoxide (CO) values.
2. Press the [Decrease button] again to check the current time.

6.5 Setting Current Time (F00)

In power-on state:

1. Long press the [Settings Key] to enter the settings mode (F00).
2. Short press the [Settings Key] again to set hours. Use [Add and Subtract buttons] to adjust the value.
3. Press the [Settings Key] to confirm hours.
4. Set minutes using [Add and Subtract buttons] to adjust the value.
5. Press [Settings Key] to save the data.
6. Press the [power button] to return.

6.6 Temperature Compensation (F01)

In power-on state:

1. Long press the [Settings button] to enter F00.
2. When at F00, press the [Increase key] to switch to F01.
3. Press the [Setup button] to set the temperature compensation. Use [Add and Subtract buttons] to adjust the value (range: -9°C to +9°C).
4. Press the [Settings Key] to confirm.
5. Press the [power button] to return.

6.7 Temperature Unit Switching (F02)

In power-on state:

1. Long press the [Settings button] to enter F00.
2. When at F00, press the [Increase key] twice to switch to F02.
3. Press [Setup key] to set the temperature unit. Use [Add and Subtract buttons] to adjust the unit.
4. Press the [Settings Key] to confirm.
5. Press the [power button] to return.

6.8 Carbon Monoxide (CO) Alarm Value Setting (F03)

In power-on state:

1. Long press the [Settings button] to enter F00.
2. When at F00, press the [Increase key] three times to switch to F03.
3. Press the [Settings key] to set the carbon monoxide (CO) alarm value. Use [Add and Subtract buttons] to adjust the value (adjustment range from 0 to 500).
4. Press the [Settings Key] to confirm.
5. Press the [power button] to return.

6.9 Carbon Monoxide (CO) Shutdown Value Setting (F04)

In power-on state:

1. Long press the [Settings button] to enter F00.
2. When at F00, press the [Increase key] four times to switch to F04.
3. Press the [Settings key] to set the carbon monoxide (CO) shutdown value. Use [Add and Subtract buttons] to adjust the value (adjustment range from 0 to 500).
4. Press the [Settings Key] to confirm.
5. Press the [power button] to return.

6.10 Backlight On or Off (F05)

In power-on state:

1. Long press the [Settings button] to enter F00.
2. When at F00, press the [Increase key] five times to switch to F05.
3. Press the [Settings button] to set the automatic off time of the backlight. Use [Add and Subtract buttons] to adjust the value (adjustment range from 0 to 60 seconds).
4. Press the [Settings Key] to confirm.
5. Press the [power button] to return.

6.11 Ambient Temperature Value (F06)

In power-on state:

1. Long press the [Settings button] to enter F00.
2. When at F00, press the [Increase key] six times to switch to F06.
3. Press [Setup key] to set the ambient temperature value. "Ctrl" starts blinking.
4. Use [Add and Subtract buttons] to adjust. "Ctrl" takes the ambient temperature of the smart carbon monoxide alarm. "SLtH" is the ambient temperature of the heater switch.
5. Press the [Settings Key] to confirm.
6. Press the [power button] to return.

6.12 Carbon Monoxide (CO) Calibration (F07)

In power-on state:

1. Long press the [Settings button] to enter F00.
2. When at F00, press the [Increase key] seven times to switch to F07.
3. Long press [Settings Key]. Wait for the "Adj" flashing to end.
4. Calibration complete.
5. Press the [power button] to return.

6.13 Firmware Upgrade

In shutdown state:

1. Long press the [Increase button] and [Decrease button] at the same time.
2. Continue holding until the Bluetooth code is displayed.
3. Follow on-screen prompts or app instructions for firmware upgrade.

7. Maintenance

• Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
• Battery Replacement: Replace batteries when the low battery indicator appears to ensure continuous operation and accurate readings.
• Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures when not in use for extended periods.
• CO Sensor Care: Avoid exposing the CO sensor to harsh chemicals, high humidity, or extreme dust, as this may affect its accuracy and lifespan.

8. Troubleshooting

9. User Tips

• Compatibility Check: Before use, ensure the A2422 is compatible with your specific diesel heater model. While designed for general diesel heaters, some models may have unique pairing requirements.
• Optimal Placement: For accurate temperature and CO readings, place the A2422 in a central location away from direct heat sources, drafts, or areas where air circulation is restricted.
• Regular Calibration: Periodically perform the CO calibration (F07) to maintain the accuracy of the carbon monoxide sensor.
• Battery Life: To maximize battery life, consider setting the backlight auto-off time (F05) to a shorter duration.

10. Warranty & Support

This product comes with a standard manufacturer's warranty. For detailed warranty information, technical support, or service inquiries, please refer to the contact information provided by your retailer or visit the official Sunster website.

Please retain your proof of purchase for warranty claims.