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Handling of the alarms
HRV alarms are indicated in the "Alarms" menu. Active alarms are displayed in a text mode on the control
panel in the measurement / alarm-field. If several alarms are active at the same time, their codes alternate
on the display with few seconds intervals.
Five most recent alarms (codes and time) are saved in the "Alarms" menu m. Old alarms are deleted from
the HRV memory when a new alarms appear.
Alarm classes
Alarm classes are divided into three classes: A, B and C. The features and delays of alarm classes can be
seen in the alarm table below. Only A and B class alarms are stored in the memory.
An alarm can have three different states:
• Active alarms ( alarm of A or B class is switched on)
• Non-active alarms ( alarm of the A or B class have been registered and switched off, cause of failure has
been eliminated)
• Registered and switched off alarm of A class; its cause of failure has not been eliminated. After the cause
of failure is removed, HRV returns in the normal mode.
Alarm Code
Service note
Emergency stop
Cold air after heat
exchanger
Hot exhaust air
Cold exhaust air
Exhaust
fan
malfunction
Hot supply air
Cold supply air
Air
supply
fan
malfunction
Operation
Alarm Class A
• Supply and exhaust fans, the heat recovery rotor and the after-heating coil are switched off.
• Alarm's code is shown on the display, the alarm contact B4 is closed, lights on the control panel are on.
Alarm Class B
• Supply fan stops, the exhaust fan operates at the minimum speed, the after-heating coil is switched off.
• Alarm's code is shown on the display, the light in the control panel flashes rhythmically with two seconds
intervals.
Alarm class C
• Normal operating mode
• Alarm's code is shown on the display, the light in the control panel flashes rhythmically with5 seconds
intervals.
Acknowledgment and switching off of alarms
Alarm Class A
• Alarms can be switched off from the HRV's "Alarms" menu, the HRV does not return automatically to the
normal mode.
Alarm Class B
• Alarm can be switched off through the HRV's "Alarms" menu. When the cause of failure is eliminated, HRV
returns to the normal mode, even if the alarm has not been switched off.
Alarm class C
• Alarm can be switched off from the HRV's "Alarms" menu.
Cause
6 months since the last service
The emergency stop button has been pressed
Temperature of the T5 Sensor is below 5 °
Temperature of T3 Sensor
Temperature of T3 Sensor is below 14 ° C
Requested speed is conflicting with exhaust fan
settings
Temperature of T2 Sensor is above 55 ° C
Temperature of T2 Sensor is below 10 ° C
Requested speed is conflicting with air supply fan
settings
is
above 50 ° C
18
Delay
A
B
6 months
0 s
X
5 min
2s
X
5 min
30 s
X
2 s
X
5 min
30 s
X
C
X
X
X
X
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