Integrating the PAC-USWHS002-WF-2 into an Existing MHK2 Setup | Step-by-Step Guide

Integrating the PAC-USWHS002-WF-2 into an Existing MHK2 Setup

The MHK2 kit consists of the MRCH2 thermostat and its MIFH2 receiver. Integrating the PAC-USWHS002-WF-2 (WI2) Wi-Fi adapter requires careful setup because both devices communicate through the same CN105 port on the indoor unit.

The WI2 introduces the second CN105 port that allows you to use the MHK2 wireless thermostat simultaneously.
PAC-USWHS002-WF-2 (Interface 2) and MHK2 Configuration

Notes
Please refer to your indoor unit’s “service manual” for detailed instructions for accessing the control interface connector CN105 on the indoor unit control PCB.

Warning
Note that a professional installer should conduct the installation to avoid any damage or injury.

Follow the steps below to set up the PAC-USWHS002-WF-2 (WI2):

  1.  Power off your HVAC unit from the circuit breaker panel
  2.  Remove the cover to gain access to the control board.
  3.  Please note that the WI2 connects to the CN105 port on the indoor unit. (You will need to disconnect the MHK2 receiver that is initially connected to the port first.)
  4.  Return the cover and power up your HVAC unit.
  5.  At this point, you should see a steady green light along with four quick blue flashes, indicating that the device is in Bluetooth LE configuration mode. 
  6.  Turn on Bluetooth in phone/tablet settings. Log in to the 2.4 GHz Wi-Fi network only. If you were previously logged in to the 5 GHz network, go into your Wi-Fi settings and forget this network.
  7.  Once the connection is established, the indicator will display three slow flashes indicating that the connection is complete. The interface is now ready to connect through the app.
  8.  Download the Comfort App (formerly Kumo Cloud) here and install it.
  9.  Create an account using your email and create a password
  10. Go to System Setup, Installer Settings. Connect new site, name the site, and enter the wireless network.
Alert
N/B: Factory reset of PAC-USWHS002-WF-2 devices manufactured before June 2022 will prevent setup via Android 12+.

Note:

      11. Connect the MHK2’s receiver to the CN105 connector on the WI2 interface only after the Wi-Fi adapter is fully set up in the Comfort app.

Do NOT connect the MHK2 receiver to the PAC-USWHS002-WF-2 until the PAC-USWHS002-WF-2 has been fully set up in the Comfort app.
If the MHK2 receiver is already connected, disconnect it before proceeding. The MHK2 will not establish communication with the WI2 until the WI2 has been completely commissioned.

Reconnecting the MHK2

  1. Press the connect button on the receiver and wait until the LED starts flashing green.

  2. Initiate the linking from the thermostat. Press and hold the menu button for 5 seconds to enter into installer setup. Resetting the thermostat allows you to link to the MIFH2
Resetting the MRCH2 thermostat can help prevent errors during the reconnection process.

Please refer to the full installation instructions at this link.