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BAXI 40ga ignition sequence question
I am much happier now that I have eliminated PS piping as baxi said. Couple of q. Right now I have one zone that is 3 radiant slab zones on zone valves, no issues when this calls), I have one 2 zone valve staple up upstairs(which I may slave to the smallest zone I will describe now which most frequently calls for heat). Last one is a loop on zone valve of staple up, flow control all the way open to allow flow accros HX, a loop that is one 24x48 buderus @ 1gmp, and one 24x48 buderus in a spare bedroom on trv(rarely on).
When ignition for CH starts it is a bit loud like the fan runs at max and then sort of turns turboish for a few seconds before modulating down, is this normal as it seems to fire at more modulation for DHW. I still get some short cycling where it hits 176 degrees quickly and shuts down waiting for 10 minute programmed refire delay I set, seems to really have issue when mid heating cycle people use hw or run DW as it gives that priority, then does not wait and refires right away after DHW call and often was mid firing cycle and hits its 176 shut off quickly.
Should this thing be firing at modulation? Could my pcb bpard be bad or the wiring for wrong odr that is now bypassed be bad, waiting for new one cause had installer had wrong model odr installed. I have lowered max % from stock to 45, have running at 140 degrees and have tried to lower max fan speed to 120 to try and stop so much ignition at firing, but I think that may affect DHW as well. I think I need new NTC, because it seems to run DHW at like 140 plus then shut down even though I have set to 118.
These are self calibrating correct? I have run a calibration sequence. But i mean, the gas valve modulates based on its flu sensor and DT on return and supply sensors etc? It does not need to have gas valve adjusted so to speak??