Expert4House BAC-009 Smart Knob Thermostat For Air Conditioners User Guide

June 13, 2024

Expert4House BAC-009 Smart Knob Thermostat For Air Conditioners

Expert4House BAC-009 Smart Knob Thermostat For Air


Please confirm that this product is suitable for your heating equipment before installation;
Before installation or maintenance, please make sure to keep the power off;
Please strictly follow the wiring diagram for wiring installation;
Installation to the wall, please confirm that the fasteners are suitable for this product;
Do not pull the cable too hard, otherwise the product will be damaged;
If a hard plastic wire is used in the installation process, it must be bent to an appropriate angle in advance;
Please arrange for professionals to install;
*Please contact the after-sales service for equipment failure, please do not try to repair it yourself;

  • After installation, please refer to this manual to check again to ensure normal and safe use, and keep this manual properly.

In The Box You Will Find

Thermostat 1pc Screws 2pc User Guide 1pc
QC Passed 1pc


BAC-009 Smart Knob Thermostat are designed to on / off control FCU the fans and valves in air conditioner applications via comparison of the room temperature and setting temp. As reaching the aim of comfort and saving energy


A: Two pipe; Control Fan Coil Unit and Two Wired Motorized Valve
M: Two pipe; Control Fan Coil Unit and 0-10V Motorized Valve
E: Four pipe; Control Fan Coil Unit and Two Wired Heat Valve and Two Wired Cool Valve.
N: Modbus RTU communication
W : Wifi connection Example: BAC-009 ALW


On Appearance

  1. LED display, more friendly interface;. LED matrix light, simple display, energy saving, protect your eyes.
  2. Touch buttons to make simple operation.
  3. The ultra-thin embedded panel perfectly fits all kinds of walls; The visiable thickenss above the wall is only 12.4mm.
  4. Frameless acrylic panel design, simple and elegant;
  5. Classic black/white color scheme, seamlessly integrated.
  6. Compatible with standard 86mm square cassettes and 60mm European cassettes to meet all installation environments;
  7. Interlock to connect gives you easy installation.

On Functionality

  1. Smart Wifi thermostat APP remote control;
  2. Strict temperature control accuracy (± 1°C) to provide the warmth you want;
  3. Power off protection, save all your settings safely;
  4. Preset adjustment of 5+1+1 mode in a week, programmable setting of 6 time periods a day, green energy saving, Less cost, more intelligent and environmental protection;
  5. Support the creation of product local groups/shares to achieve unlimited centralized control of the number of products/ multi-terminal control;
  6. Perfect access: Tmall Genie, Amazon echo, Google Home, full experience new voice control method;


Power Supply : 95 ~240 VAC, 50~60Hz or 24V DC/AC,50~60Hz Please check the information laser printed on the back of the thermostat for the actual voltage.

Fan Relay Amps Resistance: 5A; Inductive: 3A
Valve Relay Amps Resistance: 3A; Inductive: 1A
Sensor: NTC3950, 10K
Set Temp. Range: 5 -35 ℃
Accuracy: ±1 ℃
Dispaly Temp. Range: 5 ~ 99℃
Ambient Temp.:0~45 ℃
Ambient Humidity: 5 ~ 95 % RH (Non Condensing)
Storage Temp.:-5~ 45 CTiming Error: < 1%
Power Consumption: <1.5W
Shell Material: PC +ABS ( Fireproof)
Installation Box: 86 * 86mm Square or European 60mm Round Box
Wire Terminals: Wire 2 X 1.5 mm² or 1 x2.5 mm²
Protection Class: IP20
Buttons: Capactive Touch Buttons




Home Screen Quick Reference

Note : The weather will be synchronized within 1 hour after the device is connected to the Internet for the first time, and the weather will be synchronized every hour thereafter.


  1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.
  2. Check the rathings given in the instructions and on the product to make sure the product is suitable for your application.
  3. Installer must be a trained, experienced service technician.
  4. After installation is complete, check out product operation as provided in these instructions.

Electrical Shock or Equipment Damage Hazard.
Can shockindividuals or short equipment circuitry.
Disconnect power supply before installation.


Please check the information laser printed on the back of the thermostat for the actual voltage.


Your thermostat is suitable for installation within a standard 86mm pattress box or European 60mm pattress box.

  1. Accurately connect the power cable to the power terminal box.

  2. Fix the mounting plate on the cassette with a screwdriver through two screws.

  3. Hang the control panel onto the mounting plate.

  4. Installation completed.


During Power On

  1. Power On/Off: Press the knob to turn the thermostat on/off.

  2. Selecting System Mode Press“ ”to change the system mode HEATING, COOLING and VENTILATION. In the mode of VENTILATION, the valve is off but the fan runs.

  3. 3.Manual & Programmable
    Touch and hold“ ”3 sec.,“  ” icon will flash on the display, rotate the power knob to the left to switch to programming mode ” ” and to the right to switch to manual mode ” “.

  4. Setting Temperature
    In the manual mode, set temperature can be set by rotate the power knob.

  5. Setting the Fan Speed
    Press “ ”go to select the fan speed AUTO, HIGH, MED, LOW

  6. Adjusting/Setting the Clock
    Note : The wifi version will automatically synchronize the local time after connecting to the Internet.
    Touch and hold“ ”3 sec.,“ ” icon will flash on the display, Press ” “, the hour of the clock will flash, rotate the power to set the value, press the ” ” button again, and rotate the power button to complete the setting of minutes and week.

  7. Adjusting/Setting the Programmable Schedules
    WiFi version can be set in APP.
    Non-wifi version, Touch and hold“ ”,“ ” icon will flash on the display, Touch “ ” 4 times to enter the the programming mode setting.
    At this time, the screen displays (①②③④⑤), the “minute” of the time flashes, and the period 1 ” “. Press ” ” again to select and set the hour, temperature, and period. Rotate the power knob to adjust the corresponding value.
    In the same way, complete the settings of periods2, 3, 4,5and 6.
    Press the icon “ ” once more to enter the Saturday schedule settings (you will see the SAT of the screen).Repeat the above process to set the period and temp. and Sunday schedule.
    Press the icon “ ” once more to confirm and exit.
    Default settings for program scheduleTime display| MON.-FRI.
    (①②③④⑤ shows on scteen)| SAT.
    (⑥shows on scteen)| SUN.
    (⑦shows on scteen)
    Period 1| 6:00~8:00| 20| 6:00~8:00| 20| 6:00~8:00| 20
    Period 2| 8:00~11:30| 15| 8:00~11:30| 20| 8:00~11:30| 20
    Period 3| 11:30~13:00| 15| 11:30~13:00| 20| 11:30~13:00| 20
    Period 4| 13:30~17:00| 15| 13:30~17:00| 20| 13:30~17:00| 20
    Period 5| 17:00~22:00| 22| 17:00~22:00| 20| 17:00~22:00| 20
    Period 6| 22:00~6:00| 15| 22:00~6:00| 15| 22:00~6:00| 15

A separate schedule may be set for weekdays (Mon – Fri) and for weekends (Sat or Sun).

  1. Locking your Thermostat
    Press and hold the“ ”and“ ”for 5 seconds to lock/unlock your thermostat.
    In tem 3 of high senior options, you can select full lock or half lock.

Setting the Functions and Options

When the power is off, press ” ” and ” ” at the same time for 5 seconds to enter the advanced selection setting. Press ” ” to select the function, Rotate the power knob to adjust the corresponding value. All advanced option settings will take effect automatically after restarting the thermostat.

Code| Functi on| Se tting and options| Default
1| Temperature comnensation| -9 to 9 ℃| -3
2| Fan control| 00:When room temp. reaches the set pointthe fan will turn off
01:When room temp. reaches the set point thefanwill keep low speed running (only in auto fan mode}| 00
3| Button locking| 00:AII buttons are locked except power button. 01:AII buttons are locked.| 1
4| Mode select custom| 00:Cooling / Ventilation.
01:Cooling /Heating/ Ventilation.| 01
5| M in.set temp.| 5-15℃| 5
6| Max.set temp.| 15-35℃| 35
7| Display mode| 00: Display both set t emp. and room temp. 01: Display set temp. only| 00
8| Energy-saving mode| 00:Energy saving mode 01:Non-energy saving mode|


9| Heating energy- saving temperature| 10-30℃| 20
10| Cooling energy- saving temperature| 10-30℃| 26
11| Daytime display brightness| 0-8| When set to 0, the device willrun for 1O seconds after inactivity.
The screen will go completely off  with no display.| 26
12| Night display brightness| 0-8| 1
13| Deadzone temp.| 1-5 ℃| 1
14| Screen red line briahtness| 1-5| 1
15| Reset| 00: No factory reset
01: Factory reset| 00
16| Version number| | U1


WI-FI Connection

Before using your Wi-Fi thermostat for the first time, you must configure the Wi-Fi signal and settings using your smartphone or tablet. This enables communication between your devices.

Step 1 Download your APP (Fig1-1)

| QR-Code|

Search for “Smartlife” in Apple Store or Google Play or use a browser to scan the QR code above (Figure 1-2), and complete account registration and installation according to the guidance of the APP.

Step 2. Connect the thermostat
Method 1: Bluetooth network distribution (Fig 2.1-Fig 2.6) Turn on the Bluetooth switch of the mobile phone and set the thermostat to the WiFi enabled state (Press and hold the key for 8s when the thermostat is off), see the following tutorial to complete the connection and settings.
WI-FI Connection
WI-FI Connection
WI-FI Connection

Method 2: Scan the QR code to configure the network guide (Fig 2.2 & Fig 2.7-Fig 2.8) complete the connection and setup.
WI-FI Connection

Scan this QR code

Method 3: Ordinary distribution network guidance
(Fig. 2. 2 & Fig. 2.7.1)

Network distribution mode:

  1. EZ Mode
    Press and hold the “   “until the thermostat screen flashes quickly and displays the ” ” icon, and then operate according to the following figure (Fig 2.9-Fig 2.13).
    WI-FI Connection
    WI-FI Connection

  2. AP Mode
    When the thermostat is off, press and hold the ” ” until the thermostat screen flashes slowly and the ” ” icon is displayed (if the ” ” icon appears, continue to press the ” ” until the thermostat screen Flashes slowly and displays the “ ” icon), and then operate according to the following figure (Fig 2.14-Fig 2.19).
    WI-FI Connection
    WI-FI Connection
    After connecting to this hotspot, return to the “smartlife” APP
    WI-FI Connection

App Operation Interface Description (FCU thermostat))

App Operation Interface Description

More settings

More settings


No. Phenomenons Handling
1 Power is on but without display. *Check if the terminals between LCD panel

and Power Unit Box is loosen.
2| Without output but display works.| Use a new LC panel or new Power Unit Box to replace the old one.
3| Room Temp. Is a little different from the actual.|
Do temperature calibration in item 1 of high senior options


Your thermostat carries an 24 months warranty from date of purchase. Service out with the warranty period may incur a charge. More detail please contact with us directly.

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