6.5.3 Filter / Strainer
Installation of Filter / Strainer is mandatory for water system. The Filter or Strainer shall be located in front of inlet pipe of the plate heat
exchanger. While operating the system, some dust and foreign materials can circulate the system and can make the whole system not
work well due to blockage of heat exchangers and corrosion in some components. Filter mesh : #50
6.5.4 Piping insulation
The complete water circuit, including all piping, must be insulated to prevent condensation during cooling operation and reduction of
the heating and cooling capacity as well as prevention of freezing of the outside water piping during winter time. The thickness of the
sealing materials must be at least 9 mm with (0.035 W/mK) in order to prevent freezing on the outside water piping.
If the temperature is higher than 30°C and the humidity is higher than relative humidity 80%, then the thickness of the sealing materials
should be at least 20 mm in order to avoid condensation on the surface of the sealing.
6.6
Water quality
This heat pump and its components is developed to reliable and efficient work with water qualities in line with VDI 2035. In practice this
means that some general precautions should be taken:
It is mandatory to use the delivered magnetite filter for all systems.
As a heating system often contains small amounts of suspended solids (rust) and sludge products from calcium oxide, precaution should
be taken to ensure that the water in the heating system is as clean as possible to ensure long lasting performance and minimize the risk
of reliability issues. If magnetite can be expected in the heating system, cleaning of system and /or installation of magnetite filters
should always be considered. Any filters supplied with the heat pumps should always be installed. The dirt strainer should be fitted on
the return line from the heating system, as close to the heat pump as possible.
Chemical and/or oil contamination shall always be avoided.
In areas where there are exceptional water conditions with regards to hard water, a softening filter may be necessary to use/install (ap-
plies to heating system and hot water circuit). The softening filter softens the water, cleans any impurities and prevents the buildup of
calcification.
1. Fill the system with water by opening the filler valve, that is on the valve pipe, to a pressure of 0,8-1,5 bar.
2. Open all radiator valves fully.
3. Bleed all radiators.
4. Bleed the system. The outdoor unit has a factory fitted bleeding valve, next to the water in- and outlet on the back.
5. Refill the heating system to a pressure of min. 0,8-1,5 bar.
6. Repeat the procedure until all air has been removed.
7. Check the system for leakage.
Always leave all radiator valves fully open.
Installation Guide Athena
Thermia AB AWAT01IGCG0102
31
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