B427M1x120/1P-SC-S / 4xDN100C cs

B427M1x120/1P-SC-S / 4xDN100C cs designates a SWEP B427 brazed plate heat exchanger with 120 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. The /1P-SC fields read as single pass, with 316/316L stainless steel plates and a copper braze. 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 120-plate unit comes to about 101.3 kg (223.4 lb) dry. Maximum flow for the frame is 155.5 m3/h (684.65 GPM); that is a ceiling for the ports, not a duty point. Treat each side as an independant circuit when you ask for a quote: give both flows and what each fluid is.