SWEP DB300

Read the letter that follows the material code in the designation; that is the pressure class. M, the class normally used with refrigerants such as R410A, covers up to 45 bar at 135 C and is fatigue tested. S covers 31 bar at 155 C.

The class is a category, and the stamped figures on the nameplate are the rating of that unit. None of the DB300 configurations on file has a class recorded, so we work from your nameplate. If the letter is one other than L, S, M, H or U, send it as stamped and we will confirm the rating with the quote.

The DB300 designations on file carry no pass field, so the nameplate settles it for a given unit: the pass arrangement follows the plate count after a slash, and 1P is single pass.

Multi-pass sends the fluid through the plate pack more than once. That lengthens the thermal path and tightens the approach, and it raises the pressure drop. On the DB300 that works against the reason the model exists, which is low water pressure drop.

In place, by circulation. Condensers on open tower water foul faster than any other brazed duty, with scale and biological growth both narrowing the water channels.

Isolate the water side, circulate a cleaner suited to stainless steel and copper in the reverse of the service direction, then flush and neutralize. Watch the condensing pressure and the water pressure drop accross the unit as the indicators; both climb as the channels close up. Clean early, because a heavily blocked channel gets no cleaner flow. Fit a strainer on the water inlet. See Cleaning in Place.

The footprint is 525 x 243 mm (20.67 x 9.57 in). After that it is the connections: their type, size and position on both refrigerant circuits and on the water side, taken from the old unit itself.

Depth is the variable. The frame is built up to 346 plates, and the configurations on file run from 50 to 220, so two DB300 units can differ a great deal front to back. Weight follows the same count at 7.75 kg plus 0.336 kg per plate, which puts a 220-plate unit at 81.67 kg dry. Confirm the plate count before anything is cut.

These models are catalogued alongside the DB300. Each has its own page with its dimensions, materials and part numbers.

SWEP B56 - SMO 254 high-molybdenum plates - the chloride-resistant frame.

SWEP DP300 - AsyMatrix dual brazed plate evaporator with low water pressure drop, 525 x 243 mm, up to 346 plates.

SWEP DP310 - True Dual brazed plate evaporator for chillers and heat pumps, 525 x 243 mm, up to 49 bar.