Option 1 - FIGHTER 1120 docked with immersion heater
and hot water heater (floating condensing)
Principle of operation
FIGHTER 1120 prioritises hot water charging via a
shuttle valve (VXV). When the water heater/accumula-
tor tank (VVB/ACK) is fully charged the shuttle valve
(VXV) switches over to the heating circuit. The heat
pump is then controlled by the outside temperature
sensor (UG) in combination with the built-in flow sen-
sor (FG). The immersion heater (ELK) is connected
automatically when the energy requirement exceeds
the capacity of the heat pump.
This option requires the accessories ETS 12/ETS 121
and VST 11.
Menu option
This option requires the following selections to be
made in:
■ Select “Service” in menu 8.1.1.
■ Menu 9.2.13.1 “Docking type”, select alt “1”.
■ Menu 9.2.13.3 “Hot water”, select “On”.
■ Menu 9.2.13.2 “Immersion heat” type, select the
type of immersion heater installation here.
Binary 3 step: Selected when the accessory ETS
12/ETS 121 is connected
Off: Preselected
NOTE! These selections are confirmed by switching
the heat pump off and on.
■ Check the max. output setting on knob (101), see
section “Electrical connection - Max electrical addi-
tion”.
The “Auto” operating mode should be
selected in order for the electrical addi-
tion to be permitted to start.
Docking
FIGHTER 1120
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