User Manual

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Maintenance GB
6. Connect the geothermal heat exchanger and ventilation unit to the power supply.
8.3 To examine the pressure and fill the system
Do a check of the system pressure on the pressure gauge. Fill the system if necessary.
Caution
The pressure of the hydraulic circuit has to be between 0,8 and 2,5 bar to assure an ideal operation. The
optimum pressure is 1,5 bar.
1. Disconnect the geothermal heat exchanger and ventilation unit from the power supply.
2. Remove the front door.
3. Connect a filling hose to the filling valve X1.
4. Open the filling valve X1.
5. Measure the glycol percentage with a glycol refractometer.
• Fill the system with a ready-to-use mixture if necessary.
Note:
The glycol percentage must not differ more than 3% from the percentage chosen at the startup. After
filling the system with water twice, the glycol percentage has to be adjusted.
6. Use water system's pressure to set the system under a primary pressure of 1,5 bar. Use the filling hose on filling
valve X1 for that.
7. Close the filling valve X1 and remove the filling hose.
8. Put the front door back.
9. Connect the geothermal heat exchanger and ventilation unit to the power supply.
8.4 To clean the product
1. Disconnect the geothermal heat exchanger and ventilation unit from the power supply.
2. Remove the front door.
3. Remove the filter.
4. Check the fins of the geothermal heat exchanger battery for sediments and damages.
• Use steel comb to straighten the fins.
5. Flush the heat exchanger battery with a tap water.
Note:
Do not use aggressive or solvent cleaners.
6. When all work is done insert the filter.
7. Put the front door back.
8. Connect the geothermal heat exchanger and ventilation unit to the power supply.
8.5 To clean condensate drain
1. Disconnect the geothermal heat exchanger and ventilation unit from the power supply.
2. Loosen the condensate drain.
3. Examine the condensate drain:
• Put water into the siphon to see if the drain is still open.
• Do a contamination check of the condensate drain.
• Make sure there is sufficient amount of water in the siphon. There must not be air in the siphon.
4. Tighten the condensate drain.
5. Connect the geothermal heat exchanger and ventilation unit to the power supply.
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