11
Controls
The control unit operates the heat pump in three ways. We call them Curve Control, Room Sensor and
Fixed Temperature. Below follows a brief description.
Curve control (operating modes A and B)
This is the most common mode and is also the factory setting. This means that the heat pump adjusts
the heat in the house based on the outdoor temperature so that the radiator temperature increases as the
outdoor temperature reduces. An outside sensor sends signals to the control unit, which automatically
adjusts the supply of heat to the radiators. To set the temperature of a radiator for a certain outdoor
temperature, you can choose between a number of different curves on the control unit. This maximises
savings, since the heat pump never needs to work at a higher temperature than necessary. The heat
pump only delivers the maximum temperature when heating the hot water. Normally, hot water heating
accounts for 20% of the total annual requirement.
Room sensor (operational modes A and B)
A room sensor can be connected to the heat pump. It sends signals to the control unit and in this way
affects the curve control. The amount of affect the room sensor has on the curve control can be set on
the control panel. The room sensor is normally only used in combination with an outdoor sensor; when
a fan-assisted radiator is used in houses with electric radiators or a fire place, or in houses that are
wind sensitive.
Fixed temperature (operating mode C only)
This control technique is rarely used, and does not offer optimum savings from the heat pump. The
principle is that the heat pump is switched on and off by the built-in return sensor and always works
up to its maximum working temperature. The most common use for this control technique is when
there is a relatively new electric boiler and the heat pump is connected to it. The heat pump heats the
hot water cylinder in the boiler, and any additional heat required is provided by the boiler’ immersion
heater. There are unfortunately not many electric boilers on the market that are suitable for use in
conjunction with a heat pump.
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