Baxi Combi 224 Installation And Service Manual page 20

3 Technical specifications
Tab.16 Electrical connections inside the boiler (A)
Electrical power supply 230 V — 50 Hz
1: Earthing connector
X1–A
2: L (230 V)
3: N
Pump
1: Earth connection
X2–A
2: L (230 V)
3: N
3-way valve
1: L (CH) 230 V — Heating circuit opening command
X3–A
2: L (DW) 230 V — Domestic water circuit opening command
3: N — Common
X4–A Pump PWM signal
Sensor connection
HS: domestic water request
RS: heating circuit water return
X5–A
DS: heating circuit water flow
FS: flue gas
WPS: hydraulic pressure switch
ST: safety thermostat
X6–A Boiler PCB and control panel connection (electrical connection board)
X13–A Not used
X14–A Connection L-BUS
Tab.17 Electrical connections to be made to the boiler (B)
Electrical power supply 230 V — 50 Hz
1: Earthing connector
X1–B
2: L (230 V)
3: N
X4–B Room thermostat/timer (230V)
X6–B Not used
X7–B Solar probe connection
X8–B On-Off/R-Bus - Room thermostat connection (the jumper must be REMOVED to connect a device)
X9–B Service connection (SERVICE)
X13–B Connection L-BUS
X14–B Outside sensor connection (OS)
Dip-Switch
1: Maximum heating temperature OFF = 80°C - ON = 45°C (floor system)
J
2: OFF = Maximum output (heating) - ON = Boiler output 50% (heating)
3: DO NOT ADJUST
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