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For correct connection, the direction of water flow is indicated on the housing of the unit by auxiliary labels.
heating
water
outlet
air flow
direction
For the water heater to function properly, it is necessary to bleed the heater after connecting and filling the system with heating water. The vent
screws are located directly at the heat exchanger connection necks. The vent screws are accessible either from the unit outer side or upon
opening of the unit operation doors – see following figure.
Before starting service work on the heat exchanger (when replacing it), it is necessary to drain the heating water distribution system connected to
the heat exchanger and drain the heat exchanger itself using the drain screws on the heat exchanger collectors. The heat exchanger can then be
disconnected from the heating water distribution system and removed from the unit.
Max. operating water temperature of water heaters: +110 °C
Max. operating water pressure of water heaters: 1.6 MPa
Hydrogen exponent of heating water: pH 7-9
Heating water hardness: 1.0 mval / l
If necessary, water heaters can be operated with a heating medium based on a solution of water and ethylene glycol or propylene glycol -
antifreeze mixture.
For water heaters, it is necessary to pay attention to the correct installation and function of the frost protection. The frost protection sensor is
located on the heating water return, or a capillary frost protection thermostat is used (depending on the unit).
All pipes must be connected independently of the heat exchangers - the heating water pipes must not act on the necks of the heat exchangers
due to their weight and expansion. We recommend the antifreeze mixture as a heat transfer medium for all outdoor units.
heating
water
inlet
heating
water
inlet
counter-current exchanger connection
air flow
direction
heating
water
outlet
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