Controls; Curve Control (Operating Modes A And B); Room Sensor (Operating Modes A And B); Fixed Temperature (Operating Mode C Only) - IVT Greenline D14 Manual To Installation, Commissioning And Maintenance

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. With curve control, the heat pump
adapts the heating inside the house on the basis of the outside temperature. An outside sensor sends
signals to the control unit, which automatically adjusts the supply of heat to the heating system. 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 energy 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 sensor influences the curve control and the amount of influence can be
set on the control panel. Normally, room sensors are only used when a fan-assisted radiator is used
in a house with direct electric heating or when a wood-burning stove is used in the house or where
the house is effected by wind chill or solar gain.

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 normal area of use for this is together with existing
accumulator tanks.
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