24 English 5.906-736.0 Rev. 00 (07/15)Control board A1Inputs1 LCH1: Monitoring oil pressure diesel engine2 LCH2: Monitoring temperature water in the float con-tainer and monitoring temperature coolant diesel en-gine3 FUEL: Level sensor for fuel tank4 LDGT: Level switch liquid softener5 LDR: Flame sensor6 NTC: Temperature sensor booster heater (temperatureon the output after the heating coil)7 ENCDGT: Service switch for settings liquid softenerand service functions8 ENCTEMP: Water temperature setting by encoder9 PRINTED CIRCUIT BOARD: Connection between con-trol board A1 and distributor board A210 TRANSFORMER 1: Connection transformer 1 (24V AC)11 TRANSFORMER 2: Connection transformer 2 (24V AC)12 ABGASTH: Thermostat switch emission temperature(permanently set)13 WASSERSI: Flow switchOutputs14 VDGT: Solenoid valve liquid softener, 24VAV, 3A15 VCH1: Relay K7, release for starting the diesel engine,24V AC, 3A16 VCH2: Solenoid valve detergent (for HDS 13/20 and17/20 only), 24V AC, 3ADIP switchDIP1 on:With flame sensor.DIP1 off:Ohne Flammfühler.DIP2:Not assigned.DIP 3 and 4 off:Device <1000 l/h (type HDS 9/50 only).DIP3 and 4 on:Device >1000l/h (all other unit types).7.4.3 Control boards, control panel
