Earlier today, I spent a couple of hours balancing my radiators. I did it via the Drayton TRVs using their balancing key.
I managed to get them fairly well balanced with a flow temp of 65C. The radiators were really pumping out the heat and the return temperature was well below the condensing threshold.
Now the house has cooled down a bit, and the Honeywell T4 thermostat is calling for heat, things seem to have gone a bit wonky. The temperature is set to a steady 21C and the boiler is performing short burns to top up the heat (my boiler can only modulate down to 6.5kW), so the target temperature is achieved before the flow temp reaches 65C. This results in the radiators getting warm, but not hot. I think that is fairly standard when maintaining temperatures unless you have a Viessman boiler.
All the radiators are double panel, double convectors - apart from a double column radiator in the kitchen.
That column radiator feels a bit cooler than the panel radiators. When I was balancing, I set it to '1' and, even then, the return temp was a bit higher than the other radiators (Delta T of 12 vs 20 for the other radiators) . I didn't want to set it any higher because I was worried the return temp might increase and lead to boiler cycling. Now that things are running at a lower flow temperature, it appears to be getting too little flow to reach the same temperature as the other radiators.
Any thoughts on how to balance that one radiator so that it 'works' at both high and low flow temperatures?
I managed to get them fairly well balanced with a flow temp of 65C. The radiators were really pumping out the heat and the return temperature was well below the condensing threshold.
Now the house has cooled down a bit, and the Honeywell T4 thermostat is calling for heat, things seem to have gone a bit wonky. The temperature is set to a steady 21C and the boiler is performing short burns to top up the heat (my boiler can only modulate down to 6.5kW), so the target temperature is achieved before the flow temp reaches 65C. This results in the radiators getting warm, but not hot. I think that is fairly standard when maintaining temperatures unless you have a Viessman boiler.
All the radiators are double panel, double convectors - apart from a double column radiator in the kitchen.
That column radiator feels a bit cooler than the panel radiators. When I was balancing, I set it to '1' and, even then, the return temp was a bit higher than the other radiators (Delta T of 12 vs 20 for the other radiators) . I didn't want to set it any higher because I was worried the return temp might increase and lead to boiler cycling. Now that things are running at a lower flow temperature, it appears to be getting too little flow to reach the same temperature as the other radiators.
Any thoughts on how to balance that one radiator so that it 'works' at both high and low flow temperatures?