If an indoor unit needs to be removed from a system for repairs or replacing , if it's a heat recovery unit , you will need to find the port it connects to on the MCU and make that dip switch off if its first gen equip. , or if its second gen equip. you would follow the same procedure , For Heat pump you would power off the Indoor unit and reduce the quantity at the outdoor unit by 1 and press the K3 button for a reset , first gen OD unit will have rotary switches that you would dial back 1 , next Gen Equip. Press (K1+K2) for 2
seconds, then K1 AND K4 to reduce the number of ID units, then K2 for 2 seconds to save.
- MCU PORT ASSIGHNMENT SWS.
Making a Sub a Main outdoor unit.
Remove OF1/2 from the Sub and connect it to F1/2 terminals on the Sub , remove F1/2 and OF1/2 from the main and wire nut them together , set up the main control board at the Sub to match the main , number of id units and MCU'S if it's a HR this makes the sub unit the main unit , Make sure the K5,6,7&8 DIP SWS Are in the on pos . if you have another sub unit you will have to make it the first sub if not already, the K8 sws will be off, this will make the sub the Main, always press K3 for a reset, if this is next Gen OD unit with no rotary Sws. You will have to set quantities in the now main, using the K1/K2 buttons, hold for 2 sec. to set id units and Mcu's .
Reference the Air-source Manual for programming the OD unit. Control section.
- First Gen OD Dip SWS at the OD Unit.
Second Gen Programming with K1+K2 Buttons for Making Sub the Main at the OD Unit.