Connecting To The Heating System Without A Bypass - IVT Greenline HT Plus C Manual To Installation, Commissioning And Maintenance

Connecting to the heating system without a bypass:

The heat pump can be connected to the heating system without a bypass, as the circulation in the heat pump and the
heating system is managed by the integrated pump G2 (P2). This also means the main pump G1 (P1) is omitted. An
absolute prerequisite for the connection is that a minimum fl ow of at least 70% of the nominal fl ow (see the table below) can
be maintained throughout the year The thermostat valves in the heating system should be fully open and in a fl oor heating
system, it is necessary for at least half of the coils to be fully open.
The control unit gives an alarm when the temperature increase exceeds 13ºC in the heating system. If the heating system
is designed so that a minimum fl ow cannot be guaranteed, the heat pump should be connected using a bypass and an
external main pump G1 (P1).
Hot water function:
Hot water charging is started by the hot water sensor T3 (GT3), and is stopped by the return sensor T9 (GT9).
Circulation pump
The circulation pump G2 (P2) is a Wilo Star 25/6-130 in heat pumps from 6 to 11 kW.
The circulation pump G2 (P2) is a Wilo TOP-S 25/7.5 EM in heat pumps from 14 to 17 kW.
The pump curves apply for water +20ºC.
Maximum external pressure drop in the heating
system:
The maximum external pressure drop and the minimum fl ow that the
integrated circulation pump can handle is presented in the table. If the
minimum fl ow cannot be guaranteed a bypass and an external main pump
G1 (P1) should be installed.
Heat pump Nominal fl ow
C6/E6 0.20 l/s
C7/E7 0.25 l/s
C9/E9 0.31 l/s
C11/E11 0.37 l/s
E14 0.50 l/s
E17 0.57 l/s
Flow (Q)
Minimum fl ow Max external pressure drop
0.14 l/s
0.18 l/s
0.22 l/s
0.26 l/s
0.35 l/s
0.40 l/s
53
Connecting the heat pump to the heating system
36.0 kPa
36.0 kPa
34.0 kPa
33.0 kPa
54.0 kPa
51.0 kPa