Heating Function; Cooling Function; Hot Water Function; Maintenance And Cleaning - Dimplex SI 8MR Instructions D'installation Et D'utilisation

9.2 Heating Function

Start the heat pump by moving the switch (1) to the on position
(I). Preselect heating operation by moving the switch (2) to the
heating position ( ). Turn the rotary knob (4) to set the desired
return flow temperature. The potentiometer can be used to re-
quest a temperature in the range between a min. of 20 °C and a
max. of 55 °C. The actual temperature can be read from the indi-
cator (3) on the control panel. Once the set temperature is
reached, the heat pump switches off. The heat pump switches on
again when the return flow temperature falls to 4 Kelvin below
the set value. It is not possible to re-start the heat pump until after
a minimum pause time of 5 minutes. If the flow temperature is
higher than 60 °C or the brine temperature is too low, the heat
pump switches off.

9.3 Cooling Function

Start the heat pump by moving the switch (1) to the on position
(I). Preselect cooling operation by moving the switch (2) to the
cooling position ( ). Turn the rotary knob (4) to set the desired
return flow temperature. The potentiometer can be used to re-
quest a temperature in the range between a min. of 12 °C and a
max. of 25 °C. Once the set temperature is reached, the heat
pump switches off. The heat pump switches on again when the
return flow temperature rises to 4 Kelvin above the set value. It is
not possible to re-start the heat pump until after a minimum pe-
riod of 5 minutes. If the flow temperature is under 7 °C, the heat
pump switches off.
To prevent condensation from forming on the system's cooling
surfaces, we recommend installing dew point monitors at vulner-
able points in the cooling distribution system. Connect them to
the terminal X1 (1,2). If condensation then forms, the cooling of
the system is interrupted.

9.4 Hot Water Function

This heat pump can also be used to heat hot water.
Hot water preparation is requested via the terminal "X1-9" using
an external thermostat to be provided by the customer. This ther-
mostat simultaneously switches on the phase (L) to terminal
"X1-9" and the hot water circulating pump.
A suitable thermostat is available as an accessory.
Hot water preparation can also be requested even if neither heat-
ing and cooling have been requested.
If a request is pending, the heat circulating pump is switched off
by the control system. The cooling operation is interrupted and
the setpoint is raised to the maximum.
The external thermostat determines the hot water setpoint tem-
perature.
Set the temperature to approx. 10 K under the maximum flow
temperature of the heat pump to prevent the high-pressure con-
troller from initiating a switch-off.
When the preparation of hot water is concluded, the system will
continue working in the same function as before the request.
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10 Maintenance and
Cleaning

10.1 Maintenance

The heat pump is maintenance-free. 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 operating malfunctions due to
contamination occur nevertheless, the system should be cleaned
as described below.

10.2 Cleaning of Heating Side

The ingress of oxygen into the heating water circuit, in particular
if it contains steel components, may result in the formation of ox-
idation products (rust). These can enter the heating system via
valves, circulating pumps or plastic tubing. It is therefore impor-
tant - in particular with respect to the piping of underfloor heating
systems - that the installation be executed in a diffusion-proof
manner.
ATTENTION!
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!
10.3 Cleaning the Heat Source
System
ATTENTION!
Insert a dirt trap in the heat source inlet of the heat pump to protect the
evaporator against the ingress of impurities.
Clean the dirt trap's filter screen one day after start-up and sub-
sequently at weekly intervals. If no more signs of contamination
are evident, the filter can be removed to reduce pressure drops.
10.3
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