Connect Heat Pump Lw Model To The Heating System - Bosch EHP 6-11 LW User And Installation Manual

Connecting the heat pump to the heating system

Connect heat pump LW model to the heating system

Application: The principle is based on fl oating condensing in the heat pump (curve control) and additional heat from an
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 reaches the required temperature, heat is
once more supplied to the heating system.
Connecting the sensors: External sensors T1 (GT1) and T2 (GT2) must always be connected. The sensor T5 (GT5) is
connected when the heat pump is to be infl uenced by a room sensor.
An absolute prerequisite for this type of connection is that a minimum fl ow of at least 70% of the nominal fl ow can be
maintained throughout the year.
Symbols according to ISO/FDIS 14617.
Letter codes according to IEC 61346-2.
This is a principal drawing.
54
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
V21: Filter Heating system
V31: Filter Heat transfer fl uid in
V40: Hot water
W40: Cold water