QIACHIP KR2201W-4 Instruction Manual AC 110V 220V RF+WIFI Tuya Smart Remote Control Switch 1-CH Relay Receiver

Version: V1.0

Last Updated: 2026-01-28

Model: KR2201W-4

Product Size

Receiver Length (L) x Width (W) x Height (H): 80mm x 40mm x 25mm

Component Description

1: Learning button
2: Indicator light

L-In: Live wire Input terminal
N-In: Neutral wire Input terminal
L-Out: Live wire Output terminal
N-Out: Neutral wire Output terminal

Wiring Diagram

Disconnect power before wiring.

Figure 1

Figure 1: Wiring diagram for Lamp

Load: Lamp
Input Power: AC 90V-250V

Wireless Remote Control Function Description (RF Function)

(1) Momentary mode; (2) Toggle mode; (3) Latching mode; (4) Reset function; (5) Power-On Auto-Engagement.

When you use the third working mode, a remote control with at least two buttons is required.
When pairing a second remote, you don't need to press the button on the receiver 8 times again to reset it.
Once the receiver and transmitter are paired and a working mode is selected, the receiver will retain this mode even if powered off and on again.
The following working modes require the use of QIACHIP brand remote controls (transmitters) and controllers (receivers/wireless remote control switches). Compatibility with other brands is not guaranteed.

(1) Momentary mode

In this mode:

Press and hold the remote control button (such as A), and the corresponding relay on the receiver will turn on.
Release the remote control button (such as A), and the corresponding relay on the receiver will turn off.

How to set momentary mode

Step 1

Click the learning button of the receiver four times. The indicator light on the receiver will turn on, and the receiver will enter the setting state.

Step 2

Press the button on the remote control (such as A) once. The indicator light on the receiver will flash and then will turn off. The momentary mode will be set successfully.

(2) Toggle mode

In this mode:

Press the remote control button (such as A), and the corresponding relay on the receiver will turn on.
Press the remote control button (such as A) again, and the corresponding relay on the receiver will turn off.

How to set toggle mode

Step 1

Click the learning button of the receiver twice. The indicator light on the receiver will turn on, and the receiver will enter the setting state.

Step 2

Press the button on the remote control (such as A) once. The indicator light on the receiver will flash and then will turn off (Pairing successful). The toggle mode will be set successfully.

(3) Latching mode

In this mode:

Press the remote control button (such as A), and the receiver's relay will turn on.
Press the remote control button (such as B), and the receiver's relay will turn off.

How to set latching mode

Step 1

Click the learning button of the receiver three times. The indicator light on the receiver will turn on, and the receiver will enter the setting state.

Step 2

Press the button on the remote control (such as A) once. The indicator light on the receiver will flash and then will turn on (Setting in progress).

Step 3

After the indicator light turns on, press another button (such as B) on the same remote control. The indicator light on the receiver will flash and then turn off (Pairing successful). The latching mode will be set successfully.

(4) Reset function

When the KR2201W-4 receiver is reset, all paired transmitters will be unpaired and will no longer be able to control the receiver.

How to reset

Click the learning button on the receiver 8 times. The indicator light will flash and then will turn off. The reset will be complete.

(5) Power-On Auto-Engagement

After this mode is set, the relay will automatically turn on when the receiver is powered back on after a power outage.

How to set power-on auto-engagement

Press the receiver's learning button 6 times in quick succession until the indicator light flashes and then goes off (Setting successful). (After successful setup, the relay will remain in the energized state when the device is powered back on, regardless of its state before the power outage.)

Pairing with Tuya APP

Step 1

Connect your phone to 2.4GHz WIFI and turn on Bluetooth.

Step 2

Long press the learning button on the receiver for more than 6 seconds until the indicator light flashes, and the WIFI pairing mode will be successfully activated.

Step 3

Open the Tuya APP. Tap "+" to add a device in the top right corner of the screen, and then tap the device that appears to start the pairing process.

Step 4

Enter the password of the connected 2.4G WIFI, and then wait until the device pairing is completed.

Electrical characteristics

Parameter	Value
Input voltage	AC 90V-250V
WIFI frequency	IEEE 802.11 b/g/n
RF frequency	433.92MHz
Maximum Load Current	≤10A
Rated Load	Max 2200W
Receiver sensitivity	-108dBm
Operation mode	Momentary mode/Toggle mode/Latching mode/Power-On Auto-Engagement
Working temperature	-10℃~70℃
Size	80x40x25mm

Note: Rated Load breakdown by scenario: resistive load 2200W, LED light 300W, inductive load 500W, capacitive load 200W, incandescent lamp 2200W, energy-saving lamp 300W.

Warning

L and N wires must not be reversed.
When using wireless electronic devices, avoid proximity to metal objects, large electronic equipment, electromagnetic fields, and other sources of strong interference.