55
FOR THE INST
ALLER
Connect heat pump E to the heating system
Application:
The principle is based on fl oating condensing in the heat pump (curve control) and additional heat from the
electric cassette. The built-in control unit controls the heat pump using the outdoor sensor T2 (GT2) and the return sensor
T1 (GT1) according to the outdoor compensated control curve. When the heat pump is unable to meet the heating require-
ments, the electric cassette starts automatically and together with the heat pump provides the required temperature. The
heating of hot water is given priority over the heating of the heating water. Hot water heating is controlled by the sensor T3
(GT3), which is located in the hot water cylinder. When the water in the cylinder is heated, a three-way valve temporarily
disconnects heating radiator mode. When the water in the cylinder reaches the required temperature, heat is once more
supplied to the heating system.
The control unit can also control a second curve together with a mixing valve. The mixing valve curve must be set lower
than the heat curve for the rest of the heating system. This extra function is used, for example, in a fl oor heating system
that requires a lower temperature.
Connecting the sensors:
External sensors T1 (GT1) and T2 (GT2) must always be connected. The sensor T4 (GT4) is
only connected if a mixing valve curve is used. The sensor T5 (GT5) is connected when the heat pump is to be infl uenced
by a room sensor.
An absolute prerequisite for the connection is that a minimum fl ow of at least 70% of the nominal fl ow can be maintained
throughout the year.
Heating system
C11: Expansion
tank
E42: Hot
water
heater
F21: Safety
valve
F22: Safety
valve
F31: Safety
valve
G2 (P2): Heat carrier pump
G3 (P3): Heat transfer fl uid pump
G4 (P4): Pump for mixed valve system
Q41: Mixing
valve
V21: Filter
Heating
system
V31:
Filter Heat transfer fl uid in
V40: Hot
water
W40: Cold
water
* Mixed heating system
There is a possibility to control a second
heating system with a mixing valve. This
is recommended when a combination of
radiators and a fl oor heating system is used.
Symbols according to ISO/FDIS 14617.
Letter codes according to IEC 61346-2.
This is a principal drawing.
Connecting the heat pump to the heating system