Lodam LMC 320, User Manual

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. 1.0 - 11.10.10
Hot tap water valve
The output for the 3-way valve is inactive when the water temperature
is within the setpoint – neutral zone setting. When there is a request
for more hot water in the tank, the relay is activated whether the
compressor or supplemental heating is used.
The solar panel is independent of this 3-way valve.
If an installation is with a dual condenser, see Examples of application
use, the output can be used for a circulation pump.
Anti-Legionella function/treatment
In hot water tanks with lower hot water temperatures there can be a
growth in Legionella bacteria’s in the water. To prevent this growth,
the controller can be scheduled for regularly Legionella treatments
where the water temperature is raised to 60 °C.
This is done using the heat pump, external heat supply if available and
solar panel if available.
If the temperature is not reached after 5 hours within two attempts
with normal time interval, alarm 607 Legionella failed is raised.
Solar panel control
The heat pump installation can be equipped with a solar panel as a
supplemental hot water source. The solar panel must have its own coil
for heat exchange in the water tank and must be self-secured against
overheating if the is no more need for hot water in the hot water tank.
See section Examples of application use.
The solar panel is controlled by its own state machine and is only
affected from the main program if a total stop condition occurs. This
will also stop the solar panel heating.
In section Installer – Solar panel settings the different parameters
and ranges are described.
Defrost handling
A ground / water heat pump does not need defrosting, so for this
type of installation the automatic defrost must be deactivated.
Since an air evaporator in air/water heat pumps can be filled with
Functions