Special Notes For The Integration Of Heat Pumps In Existing Systems (Renovations); Commissioning Procedure; Care/Cleaning; Care - Dimplex Sih 20Te Montage- Und Gebrauchsanweisungen

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Special notes for the integration of heat pumps in
existing systems (renovations):
The existing heat distribution network (pipe materials, connec-
tion types, etc.) and the existing heating systems (e.g. radiators,
underfloor heating, etc.) can impact the quality of the water in
existing systems. Particularly when welded steel pipes or pipes
that are not oxygen diffusion-proof are used, deposits, scaling,
silting or similar may be present that can cause damage in the
heat pump system. This can result in a total failure of the heat
pump The following measures must be observed to avoid this:
 Compliance with the water properties and water quality
Flushing of the hydraulic system

Maintenance interval of the dirt traps

If silting or ferromagnetic particles are to be expected in

the hydraulic network, dirt separators or magnetite separa-
tors must be installed on-site before the medium enters
the heat pump. The maintenance intervals must be defined
by a suitably qualified person.

8.3 Commissioning Procedure

The heat pump is commissioned via the heat pump manager.
CAUTION!
Start-up must be performed in accordance with the
installation and operating instructions of the heat pump
manager..
EN-12
9

Care/Cleaning

9.1 Care

To prevent malfunctions due to sediments in the heat exchang-
ers, care must be taken that no im-purities can enter the heat
source system and the heating installation. In the event that op-
erating malfunctions due to contamination occur nevertheless,
the system should be cleaned as described below.

9.2 Cleaning of Heating Side

The ingress of oxygen into the heating water circuit, in particu-
lar if it contains steel components, may result in the formation
of oxidation products (rust). These can enter the heating system
via valves, circulating pumps or plastic tubing. It is therefore im-
portant - in particular with respect to the piping of underfloor
heating systems - that the installation be executed in a diffu-
sion-proof manner.
CAUTION!
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 sys-
tem must be cleaned by a heating technician.
Based on current information, we recommend using a 5 %
phosphoric acid solution for cleaning purposes. However, if
cleaning needs to be performed more frequently, a 5 % formic
acid solution should be used.
In either case, the cleaning fluid should be at room tempera-
ture. It is recommended that the heat exchanger be cleaned in
the direction 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 fitted 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 system.
All acids must be used with great care, all relevant regulations
of the employers' liability insurance associations must be ad-
hered to.
The manufacturer's instructions regarding cleaning agent must
be complied with at all times.

9.3 Cleaning of Heat Source Side

CAUTION!
The supplied strainer must be fitted in the heat source inlet of
the heat pump in order to protect the evaporator against the
ingress of impurities.
The filter sieve of the dirt trap should be cleaned one day after-
start- up. Further checks must be set according to the level of-
dirt.If no more signs of contamination are evident, the filter can
be removed to reduce pressure drops.
452234.66.77b · FD 0307
SIH 20TE
www.dimplex.de