6.2 Water flow in the heating system
The minimum flow rate and defrost energy must always be assured. The minimum flow rate is 1 m³/h and the recommended flow rate is
to have at least a 10% margin, resulting in a recommended flow rate of 1,1 m³/h or approximately above 18 litres per minute.
The water flow can be found in SYSTEM INFORMATION - Operating data - Flow rate and is shown in "l/m". The minimum water flow is
set to 70% as default, but this needs to be adjusted so that you have at least the recommended water flow as minimum water flow. In
order to adjust the minimum water flow, go to SETTINGS - Circulation pumps - Condenser pump HP - Min speed. Adjust the mini-
mum speed of the condenser pump in order to have at least approximately 18 l/min.
6.3 Safety valves
Warning Radiator systems with a closed expansion tank must also be equipped
with an approved manometer and safety valve, minimum DN 20, 1.5
bar opening pressure, or according to country specific requirements.
Caution Cold and hot water pipes and overflow pipes from safety valves must
be made of heat resistant and corrosion-resistant material, e.g. copper.
The safety valve overflow pipes must have an open connection to the
drain and visibly flow into this in a frost-free environment.
Caution The connecting pipe between the expansion tank and the safety valve
must slope continuously upwards. A continuous upwards slope means
that the pipe must not slope downwards from the horizontal at any
point.
Installation Guide Athena
AWAT01IGCG0102 Thermia AB
28
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