Startup

To operate the unit, the system must be fully in operation, including the fluid circuit and electrical system. To start up the unit, open the respective valves on the inlet and outlet side of the fluid circuit and connect to the electrical system:

1. Switch on the electrical system (the fans start up automatically).
2. Open the working fluid-carrying lines.
   Caution: In freezing conditions, open the inlet valve/by-pass valve slowly or control the pump startup speed to avoid tensions on the coil due to freeze structures. When the coil is free of ice, continue the normal startup procedure.

Start up procedure

3. Before starting, check that all the equipment fastening screws are properly tightened.
4. Close the system inlet valve and open the outlet valve fully.
5. Open the system and header vent valves.
6. Open the bypass valve slowly to start the liquid feeding pump.
   Fill the unit from bottom up to avoid trapped air bubbles in the coil.
7. When the air from the system has been discharged, close the vent valves.
8. Check that there are no leakages.
9. Check the electric connections.
10. Ensure that the fans are free from jams and obstacles.
11. Start the fans.
    Caution: In freezing conditions, we recommend using the fans continuously at the minimum speed. With cold start, ensure that the fans rotate freely before the startup.