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Appendix 4: Wiring diagram and operating diagram
Wiring diagram
Legend
A
= Drain
E
= Drain cock
HR
= Return water
HV
= Heating water
KW
= Cold water
N
= Mains voltage 230 VAC/50 Hz
OT
= Vent
P
= Pump
RA
= Minimum return temperature control
SV
= Safety valve (pressure relief valve)
TA
= Flue gas temperature sensor
TAS
= Thermal protection
TS
= Temperature control
TW
= Water temperature sensor
Subject to change because of technical improvements
Operating diagram
09.20007.031
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