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11
9 Maintenance and
Cleaning
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. This oxygen enters the heating system via
the valves, the circulating pumps and/or plastic pipes. It is there-
fore essential - in particular with respect to the piping of under-
floor heating systems - that only diffusion-proof materials are
used.
ATTENTION!
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 liquifier in the heat pump, the system must be
cleaned by a heating technician.
According to today’s state of knowledge, 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 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 liquifier. It is 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 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!
9.3 Cleaning the Heat Source
System
A dirt trap is inserted in the heat source inlet of the heat pump to
protect the evaporator against the ingress of impurities. When
the system is first put into operation, the filter screen of the dirt
trap should be cleaned in relatively short intervals. These inter-
vals can be prolonged once the amount of impurities decreases.
9.4 Water Quality Requirements
The ground water should not contain any substances that could
form deposits. The limit values for iron (< 0.2 mg/l) and manga-
nese (< 0.1 mg/l) must be adhered to prevent iron ochre sedi-
mentation in the heat pump system.
The use of surface water or water containing salt is not permissi-
ble. Your local water utility can provide you with general informa-
tion regarding the possible use of ground water. Water analyses
are carried out by specially-equipped laboratories.
It is not necessary to carry out a water analysis with regard to
evaporator corrosion if the annual mean temperature of the
ground water does not exceed
13 °C). In this case, the limit values for iron and manganese must
be adhered to (iron ochre sedimentation).
10 Faults / Trouble-
Shooting
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
shown on the heat pump manager display. Simply consult the
Faults and Trouble-Shooting page in the operating instructions of
the heat pump controller.
If you cannot correct the fault yourself, please contact your after-
sales service technician.
ATTENTION!
Any work on the heat pump may 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. Observe all environmentally-relevant
requirements regarding the recovery, recycling and disposal of
materials and components in accordance with all applicable
standards. Particular attention should be paid to the proper dis-
posal of refrigerants and refrigeration oils.
Heat source
temperature
Max. temperature spread
between heating flow and return
flow
From
To
7° C
12° C
10 K
13° C
18° C
11 K
19° C
25° C
12 K
Summary of Contents for WI 14ME
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