ComfortBridge™ Control System Furnace Non-Communicating Setup Using PCB Pushbuttonsby HVAC Distributors July 9, 2018
Goodman has released updated Service Bulletin SF-078 REV1 containing instructions on setting up a new ComfortBridge™ control system furnace with a non-communicating outdoor unit.
(For Goodman’s announcement on the ComfortBridge system, click here.)
UPDATE July 2019: SF-078 REV1 is being released due to the high volume of calls being received. You must setup the airflow in the “ton” menu when you have ComfortBridge indoor product attached to a non-communicating outdoor unit.
When installing a new ComfortBridge™ control system furnace with non-communicating outdoor units please adhere to the following instructions for setting up the equipment airflow. This safeguard was put in place to prevent maximum airflow when no adjustments are made during the install.
NOTE: Please refer to the Quick Start section of the installation manual IOG-2015 for low voltage wiring connections for your specific application. Once you have the unit installed, wired in correctly to terminals Y and G, and ready to start up, the following will assist you in configuring the furnace to operate with a non-communicating air conditioner using the PCB push buttons. Failure to follow these instructions will cause the unit to stay in “IdL” mode and not pass the call for “AC” airflow with a call for cooling.
1. From the “IdL” menu push the Left or Right push buttons until you get to the “OdS” menu.
2. Once at the “OdS” menu push the center button. This will get you into the submenu and display will now read “Off”. Once “Off” is on the 7 segment LED then push the Right button until you see “1AC” (single stage AC). Select the center button once to accept “1AC” and a second time back out to the “OdS” menu. Note: The “OdS” menu also contains configuration options (2AC-2stage AC, 1HP-1 stage HP, 2HP-2 stage HP.)
3. Once you have selected “1AC” and hit the center button twice you will now see “OdS” in the 7-segment displays. This confirms the change has been made and you can now push any two buttons and you will be brought back to the main “IdL” menu. Please note: if you select “2AC” or “2HP” the system will stage airflow automatically for low stage operation. High stage airflow for all types of non-communicating outdoor units (1AC, 2AC, 1HP or 2HP) will need to be set using the instruction in number 3 below.
4. You have now successfully configured the system to utilize a non-communicating air conditioner using the PCB pushbuttons. You now need to select an airflow value in the “ton” menu. You will set this according to what CFM is required by the size of the AC you have installed as found in the installation instructions. Use the right or left pushbutton to go to the “ton” menu. Press the center button once to enter the menu, then using the right or left pushbutton adjust the airflow to what is required for the system. Once you have selected the airflow needed for your application hit the center button twice to accept the value. The default value is 6.0 ton but can be adjusted in 0.1-ton increments between 1 and 6 ton using the right and left push buttons. Note: values are based on 400 CFM / Ton. Setting 3.5 ton, for example, will equal 1400 CFM in high stage.
Note: the system will not provide airflows above the Max Airflow Value.
- 3 Ton Models = 1400 CFM (*MVC960803 max CFM is 1650)
- 4 Ton Models = 1760 CFM
- 5 Ton Models = 2200 CFM
Failure to follow these instructions will cause the furnace board to display “IdL” and will NOT start the blower motor with a call for cooling. The PCB should not be replaced. These changes can also be made using the CoolCloud HVAC™ App.
If you have questions about this bulletin, HVAC Distributors customers can reach out to our Technical Service department at 800.228.4822 x5.