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Wiring Diagram – CHB 100/130
16
Modulating fan
32
Heating circulating pump
44
Gas valve
47
Modulation Regulator
72
Room thermostat
81
Ignition/detection electrode
95
Diverter valve
114 Water pressure switch
138 External probe -
Optional
278 Double sensor (Safety + Heating)
297 Air pressure transducer
370 LWCO
Field Supplied
370
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