Hello my pedigree chums. Interesting one this..
Called to check operation of a Y6630D. (Turn dial type). Bosch Worcester boiler. Y plan via programmer. Cylinder stat and valve operation all correct. Home owner informs me either house too hot or cold, no comfort temp level. I suspected large fridge next to boiler blocking signal sometimes. Moved receiver to above kitchen unit and therefore higher than fridge. Stat operation now perfect. But stat is 5 degrees out on calibration. So lent them a spare Y6630d that I had until I can get a new stat. House now nice and toasty.
Next day home owner rings me and tells me that once the stat is satisfied, approximately every 3 minutes the stat calls for heat and runs for 2 minutes. And does this until a fall in temperature and then runs continuesly until satisfied again. Then starts the whole on/off process again. I replaced the Y6630d for the New DT92E digital unit and it does exactly the same thing. Honeywell inform me this is normal modern day stat operation protocol called TPI operation. Fair enough.
But my customer says this constant operation when satisfied is wearing out the boiler. Fair point. Bosch Worcester would not comment on Honeywell controls, but said it seemed odd operation. One other thing. The boiler from instruction from the heating stat takes at least 2 minutes to ramp up to full heat and by the time it has reached its peak the heating stat shuts it off. So no benefit in heat output can be considered as the issue. So in a nutshell - is this wearing out the boiler?
Now back to Twitter......
Called to check operation of a Y6630D. (Turn dial type). Bosch Worcester boiler. Y plan via programmer. Cylinder stat and valve operation all correct. Home owner informs me either house too hot or cold, no comfort temp level. I suspected large fridge next to boiler blocking signal sometimes. Moved receiver to above kitchen unit and therefore higher than fridge. Stat operation now perfect. But stat is 5 degrees out on calibration. So lent them a spare Y6630d that I had until I can get a new stat. House now nice and toasty.
Next day home owner rings me and tells me that once the stat is satisfied, approximately every 3 minutes the stat calls for heat and runs for 2 minutes. And does this until a fall in temperature and then runs continuesly until satisfied again. Then starts the whole on/off process again. I replaced the Y6630d for the New DT92E digital unit and it does exactly the same thing. Honeywell inform me this is normal modern day stat operation protocol called TPI operation. Fair enough.
But my customer says this constant operation when satisfied is wearing out the boiler. Fair point. Bosch Worcester would not comment on Honeywell controls, but said it seemed odd operation. One other thing. The boiler from instruction from the heating stat takes at least 2 minutes to ramp up to full heat and by the time it has reached its peak the heating stat shuts it off. So no benefit in heat output can be considered as the issue. So in a nutshell - is this wearing out the boiler?
Now back to Twitter......
