COMMISSIONING CLEANING / MAINTENANCE
f)Once all heating circuit are fully open and a heating water temperature of approx. 25 °C is maintained in the buffer tank, the minimum flow rate must be set on the overflow valve and the heating circulating pump.
g)New buildings have an increased heat demand due to the energy required for structural drying. This increased heat demand may result in insufficiently dimensioned heating installations not attaining the desired room temperature at all times. In this case it is therefore recommended that the second heat generator be kept ready for operation in the first heating season. The limit temperature on the heat pump controller should therefore be raised to 15°C.
7.4 Procedure During Cooling Season
In this case, all heating circuits can be fully opened.
The setting described in 7.3 f) must be carried out during the heating season.
8 CLEANING /
MAINTENANCE
8.1 Maintenance
To protect the paint finish, avoid placing objects against or on the unit. The external parts of the heat pump can be wiped with a damp cloth and commercially available cleaning agents.
CAUTION! Do not use any cleaning agents containing sand, soda, acid or chloride as these may damage the surface.
To prevent malfunctions in the heat exchanger of the heat pump caused by dirt deposits, care must be taken that the heat exchanger cannot become contaminated in the heating installation. In the event that operating malfunctions due to contamination occur nevertheless, the system should be cleaned as described below.
8.2 Cleaning of Heating Side
The ingress of oxygen into the heating water may result in the formation of oxidation products. An ad- ditional contamination of the heating water caused by residues of lubricating and sealing agents occurs in many cases.
Both of the above causes may lead to a reduction in the performance of the heat pump condenser. In these cases the installer needs to clean the condenser. Based on information known to date we recommend cleaning with a 5% phosphoric acid solution or, in the case that cleaning needs to be performed more frequently, with a 5% formic acid solution. In both cases the
cleaning fluid should be at room temperature. Thorough flushing is necessary to ensure that all cleaning agent residues are removed from the system. It is recommended that the heat exchanger is cleaned in the direction opposite to the normal flow direction. Owing to their acid content flushing agents must be used with caution. To prevent acidic flushing agents from entering the heating installation when cleaning the condenser, we recommend that the flushing device should be mounted directly to
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