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E1 Crankcase heater, compressor
E2 Fan for nozzle ring heater
E3 Defrost end pressostat
E4 Condensing pressure pressostat
F2 High-pressure pressostat
F3 Low-pressure pressostat
F5 Thermostat HG
F23 Winding shield, fan
K1 Compressor contactor
K2 Fan contactor
M1 Compressor
M2 Fan
N1 Heat pump controller
N3 Soft start control
R9 Frost protection sensor for heating water
R10 Heating water return flow sensor
R11 Coding resistor (5k6)
X1 Terminal strip: load terminal
X2 Terminal strip: internal wiring
X3 Terminal strip: heaters
X4 Plug connector, heat pump controller
X5 Plug connector, control lead
X6 Plug connector, control lead
X7 Plug connector, heat pump
Y1 4-way reversing valve
11.4.4 Legend
APPENDIX: 11.4 WIRING DIAGRAMS