The outdoor unit's integrated flow sensor will provide information to the indoor unit display see under OPERATING DATA - Outdoor unit.
Outdoor and supply line temperature correlations
Operating mode Unit Outdoor temperature Supply line temperature
Heating mode °C -20 to +37 +20 to +65
Cooling mode* °C +15 to +37 +12 to +37
* Applies only to Athena HC models. Athena HC is only available in certain markets.
Checklist before installing
Before installing the unit, make sure to check the following:
▪
The maximum water pressure of the unit is 2.8 bar static pressure.
▪
The unit is designed to be used in a closed-loop system. Do not use any other components which are designed only for a open-loop
system.
▪
Never use Zn-coated parts in the radiator and fresh water circuit.
▪
All hydraulic parts including field piping must be insulated to prevent freezing and to reduce heat loss and condensation.
▪
Charging : Charge the water until a pressure of 0,8~1,5 bar by using make-up water assembly (Field supply). (The water pressure
indicated on the manometer will vary depending on the water temperature) The nominal water pressure in the system should re-
main about 1.0 bar at all times to avoid air entering the water system.
▪
Air venting; Make sure that air should be vented from the system at start-up or after installing/ servicing. The air venting valve must
be opened during charging the water in order to remove all air in the circuit, and a make-up water assembly allows water into the
system continuously.
▪
Make sure that the air venting valve is located at the highest point of the radiator water circuit.
▪
Select piping diameter in relation to required water flow and available external static pressure of the circulation pumps.
▪
It is recommended to clean the system using chemical cleaning agents(Begin with acid , finish with alkali).
▪
The distance between the outdoor unit and the indoor unit must be kept as small as possible in order to reduce line losses.
6.1
Water volume in the heating system
Make sure that a free flow is always possible in the heating circuit. Very small water volumes or stop in the heating circuit may cause
operational disturbances. A minimum amount of water, shown in the table below, must be contained in an open circuit in the heating
system or in a buffer tank. If the temperature in the heating circuit or in the buffer tank is too low for perform defrosting, the heat pump
automatically defrosts against the hot water tank. If the heating system itself holds the amount of water described in the table, a volume
tank is not needed, but recommended.
Description
Unit Athena 14 Athena 18
Min. water volume of buffer tank or open circuits l 60 60
Recommended water volume in the system with Athena Total 300L & Athena Com-
pact.
l 140 180
Recommended water volume in the system with Athena Total EQ. l 80 120
Min. piping dimension between indoor and outdoor unit. mm 28
Warning In order to avoid operational disturbances of the outdoor unit, a mini-
mum amount of water must be contained in the heating system. This
is shown in the table above.
Installation Guide Athena
Thermia AB AWAT01IGCG0102
27
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