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O/S TT Prestige 110 specific questions
Been adding convectors to one zone (of three) which has helped, but still short cycles on high limit more than I like. What is acceptable seems to vary by opinion, but every 15 minutes has me concerned over wear and tear on the boiler components. If any of the other zones are calling, the system is fine. It's one of the typical oversized boiler scenarios. All near boiler piping is to TT spec and primary/ secondary confirmed correct by Wallies here. I don't have a great understanding of ODR but keep tweaking with parameters related to it. It seems that I get slightly less short cycling by adjusting parameters such that my ODR max temperature setpoint is higher ; the only parameter I leave at default is "coldest day" curve of 0* for upstate NY. Each zone has it's own 3-speed UPS-15-58 Grundfos circulator which are identical to the factory internal circulator. When the short cycling zone's pump is on high the run times are longer. I previously dropped the internal circ. to low speed and the sound of the heat exchanger changed slightly noisier (perhaps steam flash?) so changed back to medium speed. Boiler pressure then was only about 11 PSI and recently went to 14-15 PSI and now the exchanger sounds normal with internal circ. on low speed and, cycling is slightly better on the troublesome zone but still room for improvement. Questions: Will this boiler show an error if it senses too little flow through the exchanger from the internal circ. being on low? Can any other parameter adjustments on this TT improve the situation without causing other problems. I refer to "parallel shift value" and "CH call blocking time" and any relevance they may have. I cannot currently afford a buffer tank or too much expense. Thank you for any suggestions.