B427M1x200/1P-SC-S / 4xDN100C cs

B427M1x200/1P-SC-S / 4xDN100C cs designates a SWEP B427 brazed plate heat exchanger with 200 plates in the pack. The digit after the plate letter (M1) tracks port size and port centre distance rather than heat transfer, so on a replacement it is the field that decides whether the unit lines up with the existing pipework. Reading the string: /1P is single pass; -SC is 316/316L stainless steel plates joined with copper. The closing S is the pressure class: 31 bar at 155 C. Connections are listed as / 4xDN100C cs, in port order. The B427 plate pack measures 694 x 304 mm (27.32 x 11.97 in) on 567 x 179 mm port centres, and by SWEP's published weight formula a 200-plate unit comes to about 148.5 kg (327.4 lb) dry. The frame is published to 155.5 m3/h (684.65 GPM) - a port limit rather than a design flow. If the flow on either side would exceed the published ceiling, the answer is a larger frame, not more plates on this one.