SWEP DV400

Upright, with the ports on a vertical face. As an evaporator the DV400 works in two-phase duty, and vertical mounting is what keeps the refrigerant evenly spread over the plates.

Run the water counter-current to the refrigerant on both circuits for the closest approach.

Keep pipe weight off the connections. A grooved coupling allows some movement, which helps, but it is not a pipe support - hang the water lines so the unit carries none of their load. Mounting and Piping covers the details.

Two things: the number of refrigerant circuits and the plate. The V400T, S400T and P400T are published at 365 GPM on the 694 x 304 mm footprint and are not True Dual models. The DV400, DS400 and DP400 are True Dual evaporators on that footprint, each published at about 335 GPM, and the DB400 is the True Dual condenser.

Within the three dual evaporators, the DP400 is described as optimized for high performance, while the DV400 and DS400 carry the same published description. They remain separate models. On a replacement, carry the full prefix over from the nameplate; a change of plate letter is a re-selection, not a substitution.

It is the last letter of the designation, after the material code. The short catalogue form - DV400x90, for example - stops at the plate count and does not show it, so the class has to be read from the nameplate of the unit being replaced.

The letter is a category, not the stamped rating of that particular unit. S covers 31 bar at 155 C, and M covers up to 45 bar at 135 C with fatigue testing, the class associated with refrigerants such as R410A. On a refrigerant evaporator, replacing an M-class unit with a lower class to save money is the error to avoid. The Pressure Classes page lists the letters; for any class not shown there, call for rating.

Four things. Height and width should read 694 x 304 mm (27.32 x 11.97 in). The port centres should read 604 x 216 mm (23.78 x 8.50 in) - this is the measurement that decides whether the pipework lines up, and it is the one most often skipped.

Third is depth, which depends on plate count. The model is built up to 282 plates, and the part numbers on file run from 50 to 220, so two DV400s can differ a great deal front to back. Last is the connection on every port: type and size, on the water side and on both refrigerant circuits.

These models are catalogued alongside the DV400. 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 DP400 - True Dual brazed plate evaporator 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 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.