Cleaning / Maintenance; Maintenance; Cleaning The Heating System; Cleaning The Heat Source System - Dimplex SIH 90TU Operating Instructions Manual

9

Cleaning / maintenance

9.1 Maintenance

To prevent faults due to sediment in the heat exchangers, care
must be taken to ensure that no impurities can enter either the
heat source system or the heating system. In the event that op-
erating malfunctions due to contamination occur nevertheless,
the system should be cleaned as described below.

9.2 Cleaning the heating system

The ingress of oxygen into the heating water circuit may result in
the formation of oxidation products (rust), particularly if steel
components are used. These enter the heating system via the
valves, the circulating pumps and/or plastic pipes. A diffusion-re-
sistant installation is therefore essential, especially with regard to
the piping of underfloor heating systems.
NOTE
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 event 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.
Based on current information, we recommend using a 5% phos-
phoric acid solution for cleaning purposes. However, if cleaning
needs to be performed more frequently, a 5% formic acid solu-
tion should be used.
In both cases, 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 of the liquefier of the heat pump.
It is then important that the system be thoroughly flushed using
appropriate neutralising agents to prevent any damage from
being caused by cleaning agent residue remaining in the system.
Acids must be used with care and the regulations of the employ-
ers liability insurance associations must be adhered to.
The instructions of the cleaning agent manufacturer must always
be observed.
9.3 Cleaning the heat source
system
ATTENTION!
The supplied dirt trap must be inserted in the heat source inlet of the heat
pump 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 re-
moved to reduce pressure drops.
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9.4 Maintenance
Refrigeration circuits with a minimum refrigerant fill quantity of
3 kg, or "hermetically sealed" refrigeration circuits with at least
6 kg, must be tested for leaks yearly by the operator according to
regulation (EC) No. 842/2006.
The leakage tightness test is to be documented and archived for
a minimum of 5 years. The test is to be carried out by certified
personnel only, according to regulation (EC) No. 1516/2007. The
table enclosed in the appendix can be used as a basis for the
documentation.
NOTE
Local regulations may differ from EU directive 842/2006. The appropriate
local regulations for heat pump leakage tightness test must be observed.

10 Faults / troubleshooting

This heat pump is a quality product and is designed for trouble-
free operation. In the event that a fault should occur, it will be in-
dicated on the heat pump manager display. In this case, consult
the "Faults and troubleshooting" page in the operating instruc-
tions of the heat pump manager.
If you cannot correct the fault yourself, please contact your after-
sales service technician.
ATTENTION!
Work on the heat pump must only be performed by authorised and
qualified after-sales service technicians!
ATTENTION!
Disconnect all electrical circuits from the power source prior to opening
the device.
11 Decommissioning /
disposal
Before removing the heat pump, disconnect it from the power
source and close all valves. The heat pump must be dismantled
by trained personnel. All environmentally-relevant requirements
regarding the recovery, recycling and disposal of materials and
components should be observed in accordance with the applica-
ble standards. Particular attention should be paid to the proper
disposal of refrigerants and refrigerant oils.
452234.66.54 · FD 9401
SIH 90TU
EN9