Connect Heat Pump E To The Heating System - IVT Greenline HT Plus C Assembly, Commissioning And Maintenance Manual

Connecting the heat pump to the heating system

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 requirements, 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 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.
* If a bypass is used and an external circulation pump is fi tted, the fl ow over the heating system can be reduced by 40% of the
nominal fl ow of the heat pump. Ensure that the larger section of the thermostat valves is fully open. Otherwise a an accumulator
tank of at least 100 litres in capacity must be fi tted. The bypass length must be at least ten times that of the pipe's inner
dimension.
Symbols according to ISO/FDIS 14617.
Letter codes according to IEC 61346-2.
This is a principal drawing.
*
*
C11:
E42:
F21:
F31:
G2 (P2): Heat carrier pump
G3 (P3): Heat transfer fl uid pump
V21:
V31:
V40:
W40:
54
Heating system
Expansion tank
Hot water heater
Safety valve
Safety valve
Filter Heating system
Filter Heat transfer fl uid in
Hot water
Cold water