QHT RIVA FP Service Instructions Manual
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___________________________________________________________________________________________________Third Part (edition-0106) Safety Thermostat_______________________________________________________________1 FunctionThe safety thermostat A in Figure 1 is a devicethat senses the temperature of the primary circuitwater which flows in the outlet pipe of the primaryheat exchanger.If the temperature control system of the boilerfails and the temperature of the primary circuitreaches a dangerous temperature, the safetythermostat opens the electric circuit that suppliesthe on-off operators of the gas valve.Consequently, the full sequence ignition deviceattempts to light the burner and, at the end, locksthe boiler and lights the lock-out signal lamp.AFigure 12 ChecksA Overheat temperature value1) Set the temp. control knob to its maximumposition and run the boiler.2) Allow the boiler to reach its maximumoperating temperature (monitor thetemperature gauge on the instrument panel).The boiler should maintain a temperaturebelow that of the safety thermostat and nooverheat intervention should occur.Warning: Isolate the boiler from the mainselectricity supply before removingany covering or component.B Electrical function1) Remove all the case panels and the lid of thesealed chamber.2) Disconnect the safety thermostat and checkits electrical function. Normally (nointervention) the contact must be closed(electrical resistance zero Ω).3 RemovalWarning: Isolate the boiler from the mainselectricity supply before removingany covering or component.1) Remove all the case panels and the lid of thesealed chamber.2) Unscrew the three screws B (Figure 2).BFigure 23) Disconnect the three connectors of the safetythermostat.4) Remove the probe holder spring C freeing thesafety probe D (Figure 3).Safety Thermostat1) Function2) Checks3) RemovalRIVA FP SERVICE MANUAL - REV A 15-1 |
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