SystemAir VTR 100/B LITE Installation And Service page 49

Reduced airflow
The unit cannot be
controlled
(control functions are stuck)
Low supply air temperature
Noise/vibrations
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1. Check the display for alarms.
2. Check setting of airflow in the control panel (chapter 5.1.1).
3. Check week program (chapter 5.7).
4. Check if one of the digital inputs 1–3 (DI 1–3) is active and set to off. This would
force one or both fans to stop depending on the setup (chapter 8.5).
5. Check if auto mode is active. Auto mode reduces the airflow if actual value from
external sensor/sensors is lower than demand control set-point.
6. Check filters. Change of filters required?
7. Check diffuser/louver openings. Cleaning of diffusers/louvres required?
8. Check fans and heat exchange block. Cleaning required?
9. Check if the buildings air intake and roof unit (exhaust) have been clogged.
10.Check visible duct runs for damage and/or build up of dust/pollution.
1. Reset control functions by pulling out the main power supply plug for 10 seconds.
2. Check the modular contact connection between the control panel and the main
print card.
1. Check the display for alarms.
2. Check set supply air temperature in the control panel.
3. Check the analogue inputs in the service menu to verify that the temp sensors are
ok (chapter 8.5). Go to Functions > Analogue input and verify the
temperature readings from the temp sensors.
4. Check that Home/Leave function is disabled DI 7.
5. Check if the over heat protection is triggered:
• For units with built-in heater: If necessary, reset by pressing the red reset
button.
• For units with external heater: For reset, see the manual for the external
electrical heater.
6. Check if digital input 4 (DI 4) is set to off. This would force the electrical re-heater
battery to be switched off (chapter 8.5)
7. Check if the extract filter must be changed.
8. At very cold outdoor conditions an electrical pre heating battery might be
necessary. This can be acquired as an accessory.
9. Check the balance between the supply and extract air
1. Clean fan impellers.
2. Check that the screws holding the fans are tightened.
3. Check that the anti vibration pads are fitted at the bottom of the unit.
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