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Hi
A quick question. Formerly we had 2x downstairs radiators (one in hall, one in front room) fed by 8mm microbore from the same 15mm feeder / return (i.e. 15mm feeder -> 2 x 8mm microbore -> 2x radiators -> 2x 8mm return -> 15mm return). We've removed one of these radiators, and the other has been replaced with two smaller rads linked in series (can give reasoning, but not critical to query) - however, the 8mm has been retained, so now we effectively have 15mm feeder -> 1x 8mm microbore -> radiator -> radiator -> 8mm return -> 15mm return. Now we're trying to balance the radiators and the second radiator in the series in cooler than the first (to be expected) - however, the lock shields on virtually every other radiator have to be almost off (less than 1/4 turn) for the new radiators to get hot. I am wondering whether removing one radiator has somehow reduced the flow through the retained microbore (although pressure should've increased?) as previously we had 1 x 15mm going to 2 x 8mm (so effectively 176mm2 cross section -> 100mm2 cross section) whereas now we have 176mm2 cross section -> 50mm2 cross section)...so the previous greater x-section of the 2 x 8mm allowed water to flow through the 15mm easier...
Or is this nonsense?
A quick question. Formerly we had 2x downstairs radiators (one in hall, one in front room) fed by 8mm microbore from the same 15mm feeder / return (i.e. 15mm feeder -> 2 x 8mm microbore -> 2x radiators -> 2x 8mm return -> 15mm return). We've removed one of these radiators, and the other has been replaced with two smaller rads linked in series (can give reasoning, but not critical to query) - however, the 8mm has been retained, so now we effectively have 15mm feeder -> 1x 8mm microbore -> radiator -> radiator -> 8mm return -> 15mm return. Now we're trying to balance the radiators and the second radiator in the series in cooler than the first (to be expected) - however, the lock shields on virtually every other radiator have to be almost off (less than 1/4 turn) for the new radiators to get hot. I am wondering whether removing one radiator has somehow reduced the flow through the retained microbore (although pressure should've increased?) as previously we had 1 x 15mm going to 2 x 8mm (so effectively 176mm2 cross section -> 100mm2 cross section) whereas now we have 176mm2 cross section -> 50mm2 cross section)...so the previous greater x-section of the 2 x 8mm allowed water to flow through the 15mm easier...
Or is this nonsense?