Inputs and Outputs
1. Inputs signal
(1)Temperature sensor on top of tank T1
(2)Temperature sensor on collector T2
(3)Temperature sensor on bottom part of tank T3

2. Output controlling
(1)Electrical booster
(2)Circulation 1 (p1)
(3)Circulation 2 (P2)

Main functions
1. Time display        
2. Temperature display      
3. Temperature difference controlled circulation    
4. Hot water timing circulation at three preset time sections  
5. Timing heating at three preset time sections      
6. Frost protection      
7. Memory protection when power is failure
8. Trouble indication of sensor