HW=state toggle and Opentherm messages

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HW=state toggle and Opentherm messages

Postby rickvanderzwet » Sun Dec 17, 2017 1:16 pm

I have a "Intergas Prestige CW6" boiler and "Honeywell Chronotherm Touch Modulation" setup. On the thermostat I have "Warm tapwater tijdens SLAPEN" (Hot Domestic Water during SLEEP) set to '0' which means IMHO that it should not heat the water in the hot water storage tank during night time. How-ever according the graph - readout of internal intergas sensors - I will do so:

boiler-temperature-resized.png
boiler-temperature-resized.png (90.56 KiB) Viewed 894 times


I am wondering which type of Opentherm messages to capture if the thermostaat sending a message the boiler to 'not heat the storage tank'. More OTGW focused if I issue HW=0 or HW=1 I would expect to see some Opentherm messages sent to the boiler to enforce this setting, yet this does not seems to be the case. Wondering how this mechanism works.
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Re: HW=state toggle and Opentherm messages

Postby hvxl » Wed Dec 27, 2017 3:57 pm

The HW command affects HB1 (DHW enable) in the status message (ID=0). You may have to configure your boiler for this bit to have effect. On my boiler (Remeha Avanta) for example, the P4 setting controls whether the boiler mode is comfort, eco, or controller regulated. The boiler only follows the DHW enable bit when P4 is set to that last one.
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