Option 1 - FIGHTER 1140 docked with immersion heater
and hot water heater (floating condensing)
Principle of operation
FIGHTER 1140 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 alternative requires the accessory 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: 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 1140
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