My landlord has fitted a new boiler, Ariston E-Combi 30, with an archaic mechanical timer. In the 21st century I at least want a heating advance button, and 7-day timer would be nice too, so I'm trying to fit a digital replacement.
The mechanical timer is a Grasslin FM/1 QRTUZH. Looking at Grasslin's range of similar timers I guessed the FMD 120 would do the job. But it's not working. Before connecting I can set the time and the programs thanks to the internal battery, and that's all I can do afterwards. It won't show me if it thinks the boiler is on, and the boiler does not come on, even when pressing the advance button. Apparently some features on the display only work with power connected so it seems like it's not getting power.
Alarmingly, Grasslin's datasheet from their website shows the FMD120 as taking DC current on pins 1 and 2, same as the diagram on the back of the mechanical timer, giving me confidence I was buying the right thing, but on the digital timer itself it says 230V AC!
The mechanical FM/1
FMD120 datasheet http://www.graesslin.de/cms/products/datasheets/en/fmd120_220_150_250_emd_120.pdf See bottom of last page for pins 1 and 2 marked as "+" and "-", so DC, right? And FMD120 itself
Perhaps my mistake is in not understanding all the "resistive load" stuff on the data sheet, but even an Electronics GCSE and Physics A level didn't teach me what that is!
So to the questions...
Are there lots of sub-types of the FMD 120 (and I have the wrong one for my boiler) or will no FMD120 work? What will work? Or should the FMD 120 work and mine is defective?
The mechanical timer is a Grasslin FM/1 QRTUZH. Looking at Grasslin's range of similar timers I guessed the FMD 120 would do the job. But it's not working. Before connecting I can set the time and the programs thanks to the internal battery, and that's all I can do afterwards. It won't show me if it thinks the boiler is on, and the boiler does not come on, even when pressing the advance button. Apparently some features on the display only work with power connected so it seems like it's not getting power.
Alarmingly, Grasslin's datasheet from their website shows the FMD120 as taking DC current on pins 1 and 2, same as the diagram on the back of the mechanical timer, giving me confidence I was buying the right thing, but on the digital timer itself it says 230V AC!
The mechanical FM/1
FMD120 datasheet http://www.graesslin.de/cms/products/datasheets/en/fmd120_220_150_250_emd_120.pdf See bottom of last page for pins 1 and 2 marked as "+" and "-", so DC, right? And FMD120 itself
Perhaps my mistake is in not understanding all the "resistive load" stuff on the data sheet, but even an Electronics GCSE and Physics A level didn't teach me what that is!
So to the questions...
Are there lots of sub-types of the FMD 120 (and I have the wrong one for my boiler) or will no FMD120 work? What will work? Or should the FMD 120 work and mine is defective?