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Combi Boiler switching
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 Posted: Monday Aug 30th, 2010 11:59 pm
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waynebr
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Hoi may be a stupid question, I am going to be having a comfort system installed soon, I would like to have my central heating also within my home automation, I currently have a C-Bus system in  place and know that my boiler needs a volt free thermostat.

I have looked at the c-bus option and a thermostat is £100 aprox which i fine but the volt free relay is almost £400.

My question is can the same job be done with the C-bus thermostat & the RLY01 from Comfort? as this would make italot more affordable.Or can anyone suggest a more affordable option.

Thanks



 Posted: Tuesday Aug 31st, 2010 03:28 am
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What is the specifications of the volt - free relay that is needed, ie coil voltage andn contact rating?

How does the Cbus thermostat connect to the volt free relay?



 Posted: Tuesday Aug 31st, 2010 05:10 pm
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waynebr
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hi all the boiler manual says is to use a volt free thermostat, it is a two wire type, the c-bus and comfort would be connected using ucm cbus



 Posted: Wednesday Sep 1st, 2010 06:03 am
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You can probably use the RLY01, if the Cbus Thermostat can drive the RLY01. The RLY01 requires a 12V output to turn on the relay, so if the Cbus thermostat is able to supply that then it should work



 Posted: Wednesday Sep 1st, 2010 04:11 pm
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palmlodge
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I use this, but CBUS takes care of the voltage free switching. Comfort controls the logic.

I also installed a 2 way switch, so I can manually switch between CBUS control and the old central heating timer (for testing).

Fairly simple - as my old central heating timer had all the info I needed.



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