U-Match Series DC Inverter Service Manual 
51 
 
Figure 2-7-15 
Table 2-7-4 Corresponding interfaces of mainboard 
Evaporator temperature sensor 
Communication port of centralized controller 
Interface of annunciator live wire 
ON interface of fresh air valve 
OFF interface of fresh air valve 
Interface of annunciator neutral wire 
Neutral wire of fresh air valve 
Live wire of fresh air valve 
Interface of anion generator 
Interface of auxiliary heating board 
Interface of outdoor unit 
Interface of wired controller 
Ambient temperature sensor