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8
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.
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.
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
8
CAUTION!