SystemAir SAVE VTR 150/B Bedienungsanleitung Seite 23

GB
Malfunction
Fans do not start
Reduced airflow
The unit cannot be
controlled (control
functions are stuck)
Low supply air
temperature
Noise/vibrations
212025 | A003
Action
1. Check the HMI for alarms.
2. Check that all fuses and fast couplings are connected (main power supply and fast
couplings for supply and extract air fans).
3. Check that the week schedule is ON and running in AUTO mode. The week schedule
might be in OFF mode with the air flow set to OFF (chapter 5.7).
1. Check the HMI for alarms. Some alarms can reduce the airflow to LOW if active.
2. The unit could be in defrost mode. This reduces the fan speed and in some cases shuts
down the supply air fan completely during the defrosting cycle. The fans go back to
normal after finished defrosting. There should be a defrosting function icon visible in the
APP or HMI home screen if defrosting is active.
3. If the outdoor air temperature is below 0°C (Outdoor air temperature sensor (OAT)
measures < 0°C) outdoor airflow compensation function can be active (if enabled). Fan
speed (Supply or Supply/Extract air fans) is linearly reduced for decreasing outdoor air
temperature.
4. Check if temporary user mode that reduces airflow is not activated, for example AWAY,
HOLIDAY, etc. Also check digital inputs CENTRAL VACUUM CLEANER and COOKER HOOD.
5. Check setting of airflow in the HMI.
6. Check week schedule settings (chapter 5.7).
7. Check filters. Is change of filters required?
8. Check diffusers/louvres. Is cleaning of diffusers/louvres required?
9. Check fans and heat exchange block. Is cleaning required?
10.Check if the buildings air intake and roof unit (exhaust) have been clogged.
11.Check visible duct runs for damage and/or build up of dust/pollution.
12.Check diffuser/louvre openings.
1. Reset control functions by pulling out the plug for 10 seconds.
2. Check the modular contact connection between the HMI and the main printed circuit
board.
1. Check the display for alarms.
2. Check the active user functions in HMI screen if Defrosting function is running.
3. Check set supply air temperature in the HMI.
4. Check if ECO mode is activated in HMI (it is a power saving function and prevents the
heater from activating).
5. Check if user modes HOLIDAY, AWAY or CROWDED are activated in the HMI or via a
hardwired switch.
6. Check the analogue inputs in the service menu to verify that the temperature sensors
are functioning correctly.
7. In case of installed electrical/other re-heater battery: Check if the overheat protection
thermostat is still active. If necessary, reset by pressing the red button on the front plate
of the electrical re-heater.
8. Check if the extract filter must be changed.
9. Check if the unit has a re-heater battery connected. At very cold outdoor conditions an
electrical or water heating battery might be necessary. A re-heater battery can be
acquired as an accessory.
1. Clean fan impellers.
2. Check that the screws holding the fans are tightened.
3. Check that the anti vibration lists are fitted to the mounting bracket and to the back of
the unit.
4. Check that the rotor belt is not slipping if the unit has rotating heat exchanger.
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Troubleshooting |