SWEP DP400

The configuration on file is material code SC: 316/316L plates with copper braze. That is the general-duty build, correct for refrigerant against treated chilled water or glycol.

Copper braze makes it unsuitable for ammonia and for deionized or ultrapure water. Chlorides are the other limit. A chilled water loop is normally closed and treated, but a process cooling loop open to a tank or fed with chlorinated make-up can pit 316 over time, and on a dual evaporator the result is water in a refrigerant circuit. Tell us if the loop is not closed. See Plate and Brazing Materials.

Take DP400x90 as the start: DP400 is the model, 90 the plate count. On the configuration we hold, SC follows as the material code and M as the pressure class.

The connection string on file is 22U+2x42U+22U+2x1/2"INT / 2x2 1/2". The entries are in port order. 22U is a universal solder connection that takes 7/8 in and 22 mm tube; 42U is the larger universal solder size and appears twice; the 1/2" INT entries are internally threaded ports; and the two 2 1/2" connections after the slash are the water side. Copy the whole string when you ask for a quote.

Circulate a cleaning solution through the water side in place, opposite to the normal flow, then flush and neutralize. Use a product safe for copper and stainless steel.

Evaporators on closed chilled water loops foul slowly, so a DP400 that needs cleaning often points to a loop problem: lost inhibitor, corrosion products from steel pipe, or debris from recent pipework. Clean the unit, but find the source and fit a strainer, or the same deposit returns. A falling temperature difference at steady load is the usual first indication.

Fewer plates means less surface, so the evaporating temperature drops to carry the load. Capacity and efficiency fall, and the unit runs closer to freezing the water side.

More plates is not automatically safe. Refrigerant velocity per channel drops, and with one of the two circuits off at part load it can fall far enough to upset superheat control and oil return.

Depth and weight change too. At 11.60 kg plus 0.65 kg per plate, going from 90 to 130 plates adds 26 kg. Configurations on file run from 50 to 220 plates.

Height and width, 694 x 304 mm (27.32 x 11.97 in), then the port centres, 604 x 216 mm (23.78 x 8.50 in). If those four agree, the frame is right.

Next come depth, which depends on the plate count, and the connections: every one, with its size, type and position. The frame is built up to 282 plates, so there is a wide spread in depth. Last, confirm the mounting can take the weight - a 220-plate unit is 154.6 kg dry - without leaning on the refrigerant lines. Then Request a Quote with the nameplate.

These models are catalogued alongside the DP400. Each has its own page with its dimensions, materials and part numbers.

SWEP B400T - Asymmetric pass arrangement - two passes one side, one the other.

SWEP DB400 - True Dual brazed plate condenser for flexible chillers and climate control, 694 x 304 mm.

SWEP DS400 - True Dual brazed plate evaporator with two refrigerant circuits, 694 x 304 mm, up to 282 plates.

SWEP DV400 - True Dual brazed plate evaporator, 694 x 304 mm, up to 282 plates, Victaulic and solder connections.

SWEP P400T - Copper-brazed 316/316L evaporator on the B400T frame, up to 280 plates, 365.44 GPM max flow.

SWEP S400T - High-capacity chiller evaporator on the B400T frame, 316/316L plates, copper brazed.

SWEP V400T - Copper-brazed 316/316L plate heat exchanger on the B400T frame for high-capacity chiller duty.

SWEP DB500 - True Dual brazed plate condenser with two refrigerant circuits, 980 x 304 mm, up to 298 plates.

SWEP DS500 - True Dual brazed plate evaporator with two refrigerant circuits, 980 x 304 mm, up to 298 plates.