Demir Dokum HK 50 M Service Bulletin
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HK 50 M – HK 10M – HK 100S SERVICE BULLETIN- If the manifold temperature < set temperature - 5 oC, the second burner will be activated. If, after 30seconds manifold temperature < set temperature -5 oC, condition is still maintained, the following burner willbe activated.- If the manifold temperature > set temperature + 2 oC, the main control closes the last burner. If the"manifold temperature > set temperature + 2 oC” does not change after 30 seconds, the burners are turned offin turn.ADDITIONAL FUNCTIONS FOR CASCADE MANAGEMENTBurner ignition order rotationAfter a command is given for the main control to ignite the first burner, in the following ignition, this burnerwill ignite the last.Limitations for start and stopAfter each start and stop phase, a minimum time must be given for the main control to ignite the first burner.Quick start and stop- If the manifold temperature < set-temperature -70 oC, the burners are switched on within 2-second intervals.- If the manifold temperature < set-temperature 4 oC, the burners are deactivated within 2-secondintervals.Low loadLow load function prevents burners from entering and leaving the system in low heat load requests. Theconditions under which the low load function is activated are controlled by each slave card. This function isprovided by the command sent to the slave cards by the master card. In normal operation, the set temperatureof the flow circuit (high, low temperature circuits, or domestic circuit) is reported to each slave card. And theset temperature values of the heating unit are controlled by each slave card.- If the heating circuit temperature > set temperature - 8 oC or if the heating circuit temperature > 85 oC- 8 oC The burner start signal will not be active.When the burner is on, if it is read by the slave card 3 times that a boiler has a temperature higher than 85 oC,the burner will stop.Each heating unit has 85 oC limit thermostat. Each boiler operation is also limited by the limit thermostat.- If boiler temperature > set temperature- Neg_slave, the burner operates as modulated.- If boiler temperature > set temperature- Neg_slave + 4,5 oC, the burner operates asmodulated.In the boiler temperature >85 oC, at low load (for low heat demand) parameter 99 is used for the waitingtime. (OEM setting is 60 seconds) or Parameter 9D is used, accordingly, the boiler runs up to set temperature+ Par 9D. (Parameter 9D =5 oC has been given as OEM) the information sent to the master card with bothparameters will decrease the burner start/stop number. The main controller will reduce the number of burnersoperating each time, with +60 second and the set temperature +5 oC parameters, until a burner operates.Service Administration 47 03/2010 |
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