ALNOR
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ventilation systems
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User Manual
HRU-PremAIR
Function
Indication pattern
Binding mode is active (continuously green)
1
Pre-heater active (long flashes of green LED)
Frost protection active (long flashes of green LED)
Bypass active
Timer mode active
External sensor demand active (it has the highest demand)
Internal RH mode active (it has the highest demand)
Normal mode (green LED flashes)
Exhaust fan error
Supply fan error
Both fans error
Emergency temperature stop
Exhaust temperature sensor fault
Inlet temperature sensor fault
Supply temperature sensor fault
Outlet temperature sensor fault
RH sensor fault
Pressure sensor one
Pressure sensor two
Exhaust Modbus error
Supply Modbus error
General Modbus error
NTC Flow Measurement T1 error
NTC Flow Measurement T2 error
Communication error with Multizoning Component
Filter dirty
1) When the button is pressed the binding mode is ended
Table 1 - LED status light
