Cleaning / Care; Care; Cleaning Of Heating Side - Dimplex LA 11MS Instructions D'installation Et D'utilisation

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Close all of the heating circuits that may also be closed during
operation (depending on the type of heat pump usage), so that
the least favourable operating state - with respect to the water
flow rate - is achieved. Normally, these are the heating circuits of
the rooms located on the south and west sides of buildings. At
least one heating circuit must remain open (e.g. bathroom).
The overflow valve is to be opened to such an extent that based
on the current heat source temperature the maximum tempera-
ture difference between heating supply and return flow tempera-
ture is obtained, as indicated in the table below. The temperature
difference should be measured as closely to the heat pump as
possible. In mono-energetic systems, the electric heating ele-
ment is to be deactivated.
Heat source
max. difference between heating
temperature
supply and return temperature
from to
-20 °C -15 °C
-14 °C -10 °C
-9 °C -5 °C
-4 °C 0 °C
1 °C 5 °C
6 °C 10 °C
11 °C 15 °C
16 °C 20 °C
21 °C 25 °C
26 °C 30 °C
31 °C 35 °C
Any malfunctions occurring during operation are displayed on the
heat pump controller and can be corrected as described in the
operating manual of the heat pump controller.
In the case of outdoor temperatures below 10 °C and heating
water temperatures below 16 °C, the buffer tank has to be hea-
ted to at least 25 °C using the backup heating system.
The following procedure has to be observed so that the commis-
sioning activities can be carried out without any problems:
1) Close all heating circuits
2) Open the overflow valve all the way.
3) Select the automatic mode on the controller.
4) Wait until the buffer tank has reached a temperature of at
least 25 °C.
5) Subsequently, slowly reopen the valves of the heating cir-
cuits, one after the other, in such a way that the heating
water flow rate is continually increased by slightly opening
the related heating circuit valve. When so doing, the heating
water temperature in the buffer tank must not fall below 20
°C so that the heat pump can be defrosted at any time.
6) Once all heating circuit are fully open and a heating water
temperature of approx. 20 °C is
maintained in the buffer tank, the minimum flow rate must be
set on the overflow valve and the heating circulating pump.
7) 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 in-
stallations not attaining the desired room temperature at all
times. In this case it is therefore recommended that the sup-
plemental heating system be kept at standby in the first
heating season. The limit temperature on the heat pump
controller should therefore be raised to 15°C.
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8.1 Care

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 ex-
changer in the heating installation cannot become contaminated.
In the event that operating malfunctions due to contamination
occur nevertheless, the system should be cleaned as described
below.
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8.2 Cleaning of Heating Side

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The ingress of oxygen into the heating water circuit, in particular
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if it contains steel components, may result in the formation of ox-
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idation products (rust). These can enter the heating system via
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valves, circulating pumps or plastic tubing. It is therefore impor-
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tant - in particular with respect to the piping of underfloor heating
systems - that the installation be executed in a diffusion-proof
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manner.
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To prevent the accumulation of deposits (e.g. rust) we recommend using
a suitable corrosion protection system.
In the case of severe contamination leading to a reduction in the
performance of the condenser in the heat pump, the system must
be cleaned by a heating technician.
Based on current knowledge, 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 either case, the cleaning fluid should be at room temperature.
It is recommended that the heat exchanger be cleaned in the di-
rection opposite to the normal flow direction.
To prevent acidic cleaning agents from entering the circuit of the
heating installation we recommend that the flushing device be fit-
ted directly to the supply and return lines of the condenser of the
heat pump.
Thereafter the system must be thoroughly flushed using appro-
priate neutralising agents in order to prevent any damage caused
by cleaning agent residues that may still be present in the sys-
tem.
All acids must be used with great care, all relevant regulations of
the employers' liability insurance associations must be adhered
to.
If in doubt, contact the manufacturer of the chemicals!

Cleaning / Care

ATTENTION!
ATTENTION!