Maintenance / Cleaning; Cleaning; Cleaning The Heating System - Dimplex LIKI 14TE Instructions D'installation Et D'utilisation

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The following additional start-up procedures must
also be carried out for operation with a circulating
pump:
Close all of the heating circuits that may also be closed during
operation (depending on the type of heat pump usage) so that
the most unfavourable operating state - with respect to the water
flow - is achieved. This normally means the heating circuits of the
rooms on the south and west sides of the building. At least one
heating circuit must remain open (e.g. bathroom).
Heat source
Max. temperature spread
temperature
between heating flow and return
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 faults occurring during operation are also displayed on the
heat pump controller and can be corrected as described in the
operating instructions of the heat pump controller.
For external temperatures below 10 °C and heating water tem-
peratures below 16 °C, the buffer tank should be heated up with
the second heat generator to at least 25 °C.
Observe the following procedure to implement a smooth start-up:
1) Close all of the heating circuits.
2) Use the controller to select the automatic operating mode.
3) Wait until the buffer tank has reached a temperature of at
least 25 °C.
4) Now slowly reopen the heating circuit valves in succession
so that the heating water flow is constantly raised by slightly
opening the respective heating circuit. The heating water
temperature in the buffer tank must not be allowed to drop
below 20 °C. This ensures that the heat pump can be de-
frosted at any time.
5) Depending on the pressure drop in the heating system, it
may be necessary to re-set the minimum volume flow quan-
tity on the heat circulating pump once all heating circuits are
fully open and a heating water temperature in the buffer tank
of approx. 20 °C is maintained.
6) New buildings have an increased heat consumption on ac-
count of the energy required to dry them out. This increased
heat consumption means that marginally dimensioned heat-
ing systems can not always achieve the desired room tem-
perature. In such cases, we recommend keeping a second
heat generator on standby during the first heating period.
The limit temperature on the heat pump controller should
also be turned up to 15 °C.
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8.1 Cleaning

To protect the paintwork, avoid leaning anything against the de-
vice or putting objects on the device. External heat pump parts
can be wiped with a damp cloth and domestic cleaner.
Never use cleaning agents containing sand, soda, acid or chloride as
these can damage the surfaces.
flow
To prevent faults due to sediment in the heat exchanger of the
heat pump, ensure that the heat exchanger in the heating system
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cannot be contaminated. We recommend protecting the evapo-
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rator by installing a bird guard in the inlet duct. At least 80 % of
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the cross section of the grating should be open. In the event that
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operating malfunctions due to contamination still occur, the sys-
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tem should be cleaned as described below.
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8.2 Cleaning the Heating System

11 K
12 K The ingress of oxygen into the heating water circuit may result in
the formation of oxidation products (rust), particularly if steel
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components are used. These products enter the heating system
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via the valves, the circulating pumps and/or plastic pipes. It is
therefore essential - in particular with respect to the piping of un-
derfloor heating systems - that only diffusion-proof materials are
used.
We recommend the installation of a suitable corrosion protection system
to prevent the formation of deposits (e.g. rust) in the condenser of the
heat pump.
Residue from lubricants and sealants may also contaminate the
heating water.
In the case of severe contamination leading to a reduction in the
performance of the liquefier in the heat pump, the system must
be cleaned by a heating technician.
According to current information, we recommend using a 5%
phosphoric acid solution for cleaning purposes. However, if clea-
ning needs to be performed more frequently, a 5% formic acid
solution should be used.
In either case, the cleaning fluid should be at room temperature.
We recommend flushing the heat exchanger in the direction op-
posite to the normal flow direction.
To prevent acidic cleaning agents from entering the heating sys-
tem circuit, we recommend connecting the flushing device di-
rectly to the flow and return flow of the liquefier of the heat pump.
It is important that the system be thoroughly flushed using appro-
priate neutralising agents to prevent damage caused by cleaning
agent residue remaining in the system.
Acids must be used with great care and all relevant regulations of
the employers' liability insurance associations must be adhered
to.
If in doubt, contact the manufacturer of the chemicals!
The buffer tank is drained using the filling and drain cocks on the
lower left of the device. Also open the ball valve on the pressure
expansion vessel to vent the buffer tank.

Maintenance / Cleaning

ATTENTION!
ATTENTION!