Heating Function; Cooling Function; Domestic Hot Water Function; Cleaning / Care - Dimplex LAC 12TR Installation And Operating Instructions Manual

8.3 Heating Function

Set switch (1) to position On (I) to put heat pump into operation.
The heating mode can be preselected by placing switch (3) to the
Heating ( ) position. The desired return temperature can be set
using selector dial (4), the relevant call for heat is controlled by
the potentiometer and lies within a range of min. 10 °C and max.
55 °C. If the preset temperature is reached, the heat pump
switches off. Once the return temperature drops below the preset
temperature by 4 Kelvin, the heat pump switches back on. In the
event that the preset return temperature cannot be reached, the
output for the back-up heater cuts in after approx. 1 hour. The
heat pump cannot be restarted until a minimum time delay of
5 minutes has elapsed. At a supply temperature of approx. 60 °C
or if the air temperature is too low, the heat pump switches off.

8.4 Cooling Function

Place switch (1) in position On (I) to put heat pump into opera-
tion. The cooling mode can be preselected by placing switch (2)
to the Cooling ( ) position. The desired return temperature can
be set using selector dial (4), the relevant call for heat is control-
led by the potentiometer and lies within a range of min. 12 °C and
max. 25 °C. When the preset temperature is reached, the heat
pump switches off. Once the return temperature exceeds the
preset value by 4 Kelvin, the heat pump switches back on. The
heat pump cannot be restarted until a minimum time delay of
5 minutes has elapsed. At a supply temperature of below 7 °C,
the heat pump switches off.
To prevent condensate from forming on the system in the case of
surface cooling systems, it is recommended that dew point mon-
itors be installed at critical places of the cold distribution system
and connected in lieu of jumper A1. In the event that condensa-
tion should form, the cooling operation of the system will be inter-
rupted.

8.5 Domestic Hot Water Function

This heat pump can also be used for heating domestic water.
The call for domestic water heating (and the domestic water tem-
perature) is controlled by terminal "X2-7" by means of a thermo-
stat to be provided by the client. This thermostat connects phase
(L) to terminal "X2-7" and controls a reversing valve which is part
of the hot water switch group "N13".
A suitable thermostat is available as an accessory.
The call for domestic water heating may also occur if no call for
space heating exists. On a call for heat, the control unit switches
off the heating circulating pump and the setpoint is set to maxi-
mum.
The water temperature is now controlled by the external thermo-
stat. After the domestic hot water preparation has been termi-
nated, the system returns to the same function that was active
before the call.
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9

Cleaning / Care

9.1 Care

To protect the paint finish, avoid placing objects against or on the
unit. The external parts of the heat pump can be wiped with a
damp cloth and commercially available cleaning agents.
ATTENTION!
Do not use any cleaning agents containing sand, soda, acid or chloride as
these may damage the surface.
To prevent malfunctions due to dirt deposits in the plate heat ex-
changer of the heat pump, care must be taken that the heat ex-
changer cannot become contaminated in the heating installation.
In the event that operating malfunctions due to contamination
occur nevertheless, the system should be cleaned as described
below. (Caution: The fins of the finned heat exchanger have
sharp edges -> risk of cutting injuries!)

9.2 Cleaning of Heating Side

The ingress of oxygen into the heating water, especially in the
case of steel components, may result in the formation of oxida-
tion products (rust). These may enter the heating system through
valves, circulating pumps or plastic pipes.
ATTENTION!
To prevent the formation of deposits (e.g. rust) in the plate heat
exchanger of the heat pump, we recommend using an appropriate
corrosion protection system
Additional contamination of the heating water caused by resi-
dues of lubricating and sealing agents can be observed in many
cases.
Both of the above causes may lead to a reduction in the perform-
ance of the plate heat exchanger of the heat pumps. In such
cases, the installer must clean the heat exchanger concerned.
Based on information known to date 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 so-
lution. In both cases the cleaning fluid should be at room temper-
ature. Thorough flushing is necessary to ensure that all cleaning
agent residues are removed from the system. It is recommended
that the heat exchanger be cleaned in the direction opposite to
the normal flow direction. Owing to their acid content, flushing
agents must be used with caution. To prevent acidic flushing
agents from entering the heating installation when cleaning the
condenser, we recommend that the flushing device be mounted
directly to the supply and return line of the heat pump. The regu-
lations of the trade associations must be adhered to. If in doubt,
contact the manufacturers of the chemicals!
ATTENTION!
To prevent consequential damage it is imperative that the water circuit be
neutralized after cleaning using appropriate agents.
9.2
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