IVT Optima 1000 Assembly, Commissioning And Maintenance Manual page 67

Hot water peak
On delivery the heat pump is set for recurring hot water
peaks. This means that the water temperature in the hot
water heater is raised at preset time intervals.
Mixing valve
When using a heating system with both radiators and
fl oor heating you should connect a mixing valve to lower
the temperature of the fl oor heating system. The mixing
valve is a valve that mixes cold and hot water to the correct
temperature.
Operating modes
When a heat pump is installed it must be setup for a
specifi c operating mode. An operating mode relates to the
heat pump's working situation which is dependent on the
prevailing conditions, for example, whether an electric or
oil-fi red boiler is to be connected.
Outdoor sensor
An outdoor sensor is a sensor fi tted to the outside wall
of the house. The sensor sends signals to the control
unit in the heat pump. The signals report the outside
temperature so that the heat pump can adapt the heating
in the house depending on the outdoor temperature. If
the outdoor temperature drops, i.e. it becomes colder, the
radiators inside the house will give off more heat.
Particle fi lter
It is the particle fi lter that ensures no particles or dirt
enter the heat pump. This can become clogged with
dirt over time and must be cleaned. The particle fi lter is
located on the "the hot side".
Pressure switch
Pressure switches (pressostats) are located on the
system's high and low pressure sides to protect the heat
pump from forbidden pressure levels. There is also a
sensor that stops the heat pump at outdoor temperatures
below -10ºC. When the outdoor temperature is below
-10ºC for more than 30 minutes the heat pump stops and
switches to additional heat operation only.
Radiator
The radiators are carefully placed in the building to
provide the best possible heat.
Refrigerant
The heat pump consists of four main parts: evaporator,
condenser, expansion valve and compressor. These four
main parts are linked in a closed circuit. A refrigerant cir-
culates in the system, which in some parts of the circuit is
in a liquid state and in other parts in a gas state. It is the
refrigerant that transfers the heat in the heat pump and it
is the relation between the boiling point and pressure of
the refrigerant that is the secret of the heat pump.
Refrigerant circuit
The pipe system in the heat pump where the refrigerant
circulates.
Return temperature
Return temperature designates the temperature of the
heating water when it returns from the radiators and fl oor
coils. For technical reasons the return temperature must
not exceed +48ºC.
Room sensor
A room sensor is a sensor that is installed centrally in the
house. It is connected to the heat pump and gives signals
to the control unit about the heating conditions in the
house. The signals affect the control unit and ensure the
heat pump gives the best possible energy savings.
Sensors
The sensors measure the temperature at different
locations in and outside the heat pump. The sensors play
an important part in daily operations. It may, for example,
adjust the heating production so that the pump does not
become overheated.
Sight glass
The sight glass is used to check the level in the refriger-
ant circuit. Bubbles can occur during the start and stop
of the heat pump and when defrosting, but bubbles must
not be present all the time.
Three-way valve
The valve switches between heating the heating water
and hot water.
67
Glossary