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Use clean pipes only.
Hold the pipe end downwards when removing burrs
Cover the pipe end when inserting it through a wall so that no dust and dirt enter.
Use a good thread sealant for sealing the connections. The sealing must be able to withstand the pressures and temperatures of the plant.
When using non-brass metallic piping,make sure to insulate both materials from each other to prevent galvanic corrosion. Never use Zn-coated parts in
the water circuit. Excessive corrosion of these parts may occur as copper piping is used in the unit's internal water circuit.
7.5.5 Filling with water
1. Connect the water supply to the relevant connection (see detail 9 "fig. 7 - dimensional data and connections" on page 24) and open the valve.
2. Make sure that the automatic vent valve is open.
3. Fill with water until the manometer indicates a pressure of approximately 2.0 bar. Use the vent valve to remove the air in the circuit.
NOTE
During filling, it might not be possible to remove all air in the system. Remaining air will be removed through the automatic air purge valves during the
first operating hours of the system. Topping up the water afterwards might be required. The water pressure indicated on the manometer will vary depend-
ing on the water temperature (higher pressure at higher water temperature). However, at all times water pressure should remain above 0.3 bar to avoid air
entering the circuit.
The unit is only to be used in a closed water plant. Application in an open water circuit can lead to excessive corrosion of the water pipes.
Never use Zn-coated parts in the water circuit. Excessive corrosion of these parts may occur as copper piping is used in the unit's internal water circuit.
When using a 3-way valve or a 2-way valve in the water circuit. The recommended maximum changeover time of the valve should be less than 60 seconds.
7.5.6 Water circuit anti-freeze protection
All internal hydronic parts are insulated to reduce heat loss. Insulation must also be added to the field piping.
The software contains special functions using the heat pump and backup heater to protect the entire system against freezing. When the temperature of the water flow
in the system drops to a certain value, the unit will heat the water, either using the heat pump, the electric heating tap, or the backup heater. The freeze protection
function will turn off only when the temperature increases to a certain value.
In event of a power failure, the above features would not protect the unit from freezing.
CAUTION
When the unit is not in use for a long period, make sure that the unit is always switched on. If you want to disconnect the power supply, the
water in the indoor unit must be drained to prevent damage to the pump and pipes from freezing temperatures.
•
The unit might drain-off too much water through the pressure relief valve.
•
Water quality should be complied with EN 98/83 EC Directives.
•
Detailed water quality condition can be found in EN 98/83 EC Directives.
7.5.7 Water piping insulation
The complete water circuit including all piping, water piping must be insulated to prevent condensation during cooling operation and reduction of the heating and cool-
ing capacity as well as prevention of freezing of the outside water piping during winter. The insulation material should at least of B1 fire resistance rating and complies
with all applicable legislation. The thickness of the sealing materials must be at least 13 mm with thermal conductivity 0.039 W/mK in order to prevent freezing on the
outside water piping.
If the outdoor ambient temperature is higher than 30°C and the humidity is higher than RH 80%, then the thickness of the sealing materials should be at least 20 mm
in order to avoid condensation on the surface of the seal.
34
EN
Cod. 3542B230 - Rev. 00 - 02/2022
OMNIA S HYBRID H 3.2
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