Operation and maintenance instructions for Systemair VR 300 ECV/B Air Handling Unit

Quick guide from the manual

The Systemair VR 300 ECV/B is an air handling unit designed for continuous operation. Maintenance should be performed 3-4 times per year to ensure efficiency. Always disconnect the mains supply before performing any electrical work or maintenance. Use protective gloves when handling the unit due to sharp edges.

Operation

The airflow can be controlled via an external 3-step speed regulator or a connected cooker hood.

• Min (1): Minimum ventilation, used during holidays or when the building is not in use.
• Norm (2): Normal ventilation adapted to the building.
• Max (3): Forced ventilation, used when extra airflow is required.

Supply air temperature: The temperature can be adjusted using a switch located inside the unit. Turning the switch clockwise increases the temperature, while counter-clockwise decreases it. The unit features an automatic electrical heater battery that switches on if heat recovery is insufficient.

Summer operation: If the supply air temperature exceeds the set value, the rotor stops to prevent heat recovery.

Extract from cooker

The unit can be connected to a specific cooker hood. The hood must have a damper that leaves no opening when closed. When forced ventilation is activated via switch A, the fans automatically switch to Max speed (3). The extract air from the cooker bypasses the heat exchanger.

Maintenance

Maintenance should be performed 3-4 times per year.

• Filter change: Replace fresh air/extract filters 1-2 times per year. Pull the filter frame straight out to remove.
• Heat exchanger/Rotor belt: Check the belt during filter changes. Ensure it is undamaged and tight enough to move the heat exchanger wheel. Clean the exchanger block every 3 years in hot soapy water (do not use ammonia-based detergents).
• Fans: Clean every 3 years. Remove fans by unplugging electrical couplings and clean with a soft brush or cloth. Do not use water.
• Extract louvers and inlet diffusers: Wash in hot soapy water as required. Do not exchange positions.
• Fresh air intake: Check at least twice a year for leaves or pollution.
• Duct system: Clean every 5 years using a brush soaked in hot soapy water.

Troubleshooting

Before calling for service, check the following:

• Fan(s) do not start: Check fuses and ensure all plugs are connected.
• Reduced airflow: Check control panel settings, filter status, diffuser/louver cleanliness, and ensure the air intake is not clogged.
• Cold supply air: Check the temperature setting and ensure the fire thermostat has not tripped (reset by pressing the red button in the unit).
• Noise/vibrations: Clean fan impellers and ensure fan screws are tightened.

Service

If service is required, locate the type label on top of the unit. Note the item number and production number before contacting your service representative.