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User Manual
HRU-PremAIR
16. Diagram of the main board (PCB)
Figure 3 -
diagram of the main board (PCB)
Description
Socket number
Fan 1 (supply) - signal
X6
Fan 2 (extract) - signal
X5
Fan 1 (supply) - line
X13
Fan 2 (extract) - line
X14
Temperature 1 supply
X23
Temperature 2 extract
X21
Temperature 3 exhaust
X20
Temperature 4 outdoor
X22
Stepper motor
X15
Power supply
X27
Preheater
X17
3 - speed switch input
X9
1 - open (low speed)
1-2 closed (medium speed)
1-3 closed (high speed)
Fireplace/hood input
X25
1-2 closed (extract fan off)
Pressure transmitter (supply) optional
X18
Pressure transmitter (exhaust) optional
X42