Control Unit - Bosch EHP 6-11 LW User And Installation Manual

Control unit

Control unit
The control unit is the brains of the heat pump. It makes sure the heat
pump gives the best energy savings and that it runs for many years. The
control unit controls and monitors the heating and hot water supply in your
house. The monitoring function is especially important. It shuts down the
heat pump in the event of operational disturbances so that no critical parts
are damaged.
Additional heat gives more output
When the heat pump can not manage to heat the house by itself, for
example, if there is a considerable drop in the outdoor temperature, the
control unit ensures the additional heat source is connected. Together
the heat pump and additional heat guarantee the right temperature in the
house. Additional heat is provided by a built in electric cassette. Additional
heat can never completely take over the heating from the heat pump. It
only adds the output necessary for the heat pump to be able to produce the
right temperature. When the heat pump can once again manage heating on
its own the additional heat is automatically disconnected.
Hot water is given priority over heating water
In a house with water based heating a difference is made between heating
water and hot water. The heating water is for radiators/fl oor heating and
hot water is for showers and taps. Hot water is heated in a hot water heater.
The hot water heater is fi tted with a sensor that senses the temperature of
the hot water. LWM models include a hot water heater in the heat pump
while LW models have an external hot water heater. The heating water
passes through the hot water cylinder's outer shell and heats up the hot
water heater's inner tank. The control unit makes sure the heating of hot
water is always given priority over the heating of the heating water. This
means you never need to be without hot water. The control unit controls a
three-way valve that switches between heating the heating water and hot
water. Once the hot water has been heated the three-way valve switches so
that the heating water is heated.
Three-way
valve
Electric cassette
(additional heat)
Control unit
Hot water
Heating water
10
Double-shelled hot water heater