SWEP DP200

Duty and plate, not size. All of them are 525 x 243 mm. The DB200 is the True Dual condenser. The DP200 and DV200 are both True Dual evaporators with 316/316L plates and a 118.88 GPM maximum flow, but they are separate models with different published weights, so one is not a drop-in for the other without a rating.

The B200T, F200T, P200T and V200T on the same footprint are listed at 192.41 GPM, and the F200T and P200T use 304 plates. None of those replaces a dual unit on a two-circuit machine.

It suits refrigerant on one side and clean water or inhibited glycol on the other, which is the normal chiller and heat pump case. 316/316L handles ordinary closed-loop water well.

It does not suit ammonia, which attacks copper braze, or deionized and ultrapure water, which leaches copper out of the joints. Chloride-bearing water - brackish, chlorinated or seawater-cooled loops - pits 316, and that failure shows up as a refrigerant circuit taking on water. If the loop is anything other than treated closed-circuit water, say so when you ask for a quote. More on the choices is under Plate and Brazing Materials.

Only in place. A brazed unit cannot be opened, so cleaning means circulating a cleaning solution through the water side, normally against the direction of service flow so that debris lodged at the inlet ports is pushed back out the way it came in.

Choose a cleaner that is safe for both stainless steel and copper, flush thoroughly and neutralize afterward. A strainer ahead of the water inlet prevents most of it.

It tells you the model - DP200, the True Dual evaporator on the 200-size plate - and the plate count, 130. That is enough to fix the 525 x 243 mm footprint and the depth.

It does not tell you the pass arrangement, the material code, the pressure class or the connections, all of which follow the plate count on a full nameplate. On a dual evaporator the connection string is the long part, because it lists both refrigerant circuits and the water side in port order. Copy it exactly as stamped, including any plus signs and slashes.

Undersized, with too few plates, the evaporating temperture drops to make up for the missing surface. Suction pressure falls, capacity falls with it, and the unit runs closer to freezing on the water side.

Oversized is less obvious. With too many plates the refrigerant velocity in each channel is low, particularly when only one circuit is running, and oil return and stable superheat control both suffer. The symptom is a hunting expansion valve. On a replacement the safe course is the original plate count; the range on file runs from 50 to 200 plates.

Threaded, Victaulic and solder connections are catalogued. Refrigerant circuits are normally solder and the water side threaded or Victaulic, but read the nameplate instead of assuming.

Match the method and the size on every port. A solder connection marked with a U is a universal type that accepts both imperial and metric pipe, which helps when a machine built to metric tube is serviced with imperial. Grooved water connections need the same groove size as the existing couplings. Send a photo of each connection if the stamping is unreadable.

These models are catalogued alongside the DP200. Each has its own page with its dimensions, materials and part numbers.

SWEP B200T - Dual-over-two-pass on the 525 x 243 mm frame.

SWEP DB200 - True Dual brazed plate condenser for chillers and heat pumps, 525 x 243 mm, up to 202 plates.

SWEP DV200 - True Dual brazed plate evaporator for chiller and heat pump applications, 525 x 243 mm.

SWEP F200T - A copper-brazed 304 stainless evaporator with solder connections for chillers and heat pumps.

SWEP P200T - Brazed plate evaporator with long thermal length, 525 x 243 mm, up to 250 plates, solder connections.

SWEP V200T - Evaporator on the B200T frame, 525 x 243 mm, up to 250 plates, 192.41 GPM max flow.