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CTC EcoLogic M/L
1.3.1.4
Pressure/level switch
In some cases, extra protection is required due to local requirements or
provisions. For example, the requirement in some areas is for the system to
be installed within a water catchment area.
The pressure/level switch connects to terminal blocks K22/K23/K24/K25
and is then defined in the "Installer/Define/Def. Heat Pump" menu. If there
is a leak, the compressor and brine pump stops and the Flow/level switch
alarm appears on the display.
1.3.1.5
Speed-controlled charge pump
Each heat pump should have a separate charge pump that starts and
stops together with its respective heat pump. If the charge pump is speed-
controlled, the flow will be automatically set without adjustment via the
control valve.
In the heating circuit, the charge pump will work towards a fixed difference
between supply and return from the heat pump.
If a speed-controlled charge pump is not installed, the flow may be adjusted
manually in accordance with the heat pump’s manual. The difference
between incoming and outgoing water from the heat pump will vary
depending on the operating conditions during the year.
When the outdoor temperature is less than +2 °C, the charge pumps
must start in order to protect against frost in cases where an air/water
heat pump is installed. A speed-controlled charge pump will only work at
50% of its maximum capacity. This provides for increased savings on the
charge pump’s operating economy. In addition, the heat losses are lowered
compared with a charge pump with a fixed speed setting.
1.4
DHW
DHW can be directed from heat pumps, solar panels and additional heat to
the DHW tank.
The required DHW comfort level is set in the DHW menu. In this main menu,
it is possible to schedule increased water temperatures during certain times
of the day.
The stop temperature in the DHW tank is factory-set at 55°C. When DHW
is being drained and the temperature in the tank falls to 5°C below the stop
temperature, the heat pump starts and raises the water temperature towards
the set stop temperature.
The stop temperature is adapted to DHW needs and to the heat pump
model installed.
When there is a requirement for heat in the house at the same time, the heat
pump charges the heating circuit even when the stop temperature (55°C) in
the DHW tank has been reached.
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