Heating in general
6 720 643 409 (2010/03)
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4 Heating in general
The heating system consists of one or more circuits;
these may also have a cooling function (option). The
heating system is installed according to operating mode,
depending on access to and type of addition. Settings
for this are made by the installer
4.1 Circuits for heating
• Circuit 1; the first circuit is included by default in the
control unit and is controlled by the installed flow
sensor, possibly in combination with an installed
room sensor.
• Circuit 2-4 (mixed); control of up to 3 additional
circuits is optional. Each circuit is then fitted with a
mixing valve module, circulation pump, flow sensor
and possible room sensors.
4.2 Control method for heating
• Outdoor sensor; a sensor is fitted on the outside wall
of the house. The sensor sends signals to the control
unit in the heat pump. Control with an outdoor sensor
means that the heat pump automatically regulates the
heating in the house depending on the outdoor
temperature. The customer determines the
temperature of the heating system in relation to the
outdoor temperature by setting the current room
temperature in the control unit.
• Outdoor sensor and room sensors (one room sensor
per circuit is possible); Control with outdoor sensor
supplemented with room sensor(s) means that one
(or several) sensors are mounted in a central location
inside the house. It is connected to the heat pump
and provides the control unit with information about
the current room temperature. The signal affects the
flow temperature. For example, it falls when the room
sensor indicates a higher temperature than the one
set. Room sensors are used when factors other than
the outdoor temperature influence the indoor
temperature of the house. For example, this can be
when a stove or fan-assisted radiator is used in the
house, or if the house is sensitive to the wind or
exposed to direct sunlight.
4.3 Clock setting of heating
• Program control; the control unit offers four fixed
and two individual programs for clock setting of day/
time.
• Holiday; the control unit has a program for holiday
mode, which means that during the selected period
the room temperature changes to a lower or higher
level. The program also allows switching off hot water
production.
• External control; the control unit can make settings
for external control, which means that the
preselected function is performed when the control
unit senses an input signal.
4.4 Operating modes
• With electrical additional heat; the heat pump is
dimensioned less than the house peak heating load
and electrical additional heat is permitted to cut in at
the same time as the heat pump to meet the demand,
when the heat pump cannot meet it itself. Alarm
mode, Extra hot water and Hot water peak, and if the
heat pump is off at low outdoor temperatures, the
addition is also activated.
Circuits 2 through 4 cannot have a higher
flow temperature than circuit 1. This means
that underfloor heating on circuit 1 cannot
be combined with radiators on another
circuit. Room temperature reduction for
circuit 1 can affect other circuits in some
cases.
The maximum number of circuits is reduced
by one circuit for each XB2 based accessory,
such as IVT PKS 1000.
It is only the room where the room sensor is
located that can influence regulation of the
temperature.
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