SWEP B60

Keep the water moving whenever the other side can pull it below freezing, and prove that it is moving. The M-class builds on file point to refrigerant service, where the usual failure is a pump trip or a blocked strainer with the compressor still running.

Use a flow switch or differential-pressure proof on the water side, a low-temperature or low-pressure cutout, and a pump that starts before the refrigerant side and stops after it. Add glycol where the ambient or the design leaving temperature calls for it, and state the concentration so the selection accounts for the extra pressure drop. If the old B60 failed by freezing, find the cause before the new one goes in. Freeze Protection has the detail.

Only after checking why. A unit that fell short from new was undersized. One that met the duty for years and then faded is fouled, and a larger replacement will foul the same way.

Going up in plate count on the same frame is the clean fix for a true shortfall, since the footprint and port positions stay put. Do not overshoot. A heavily oversized B60 runs at low channel velocity, collects sediment, and gives a control valve very little range to work with at part load.

Yes, and it is the only way, because the pack is brazed solid. Circulate the cleaning solution through the fouled circuit in the reverse of normal flow using a separate pump and tank, then flush until the water runs clean and neutral.

Choose a solution suited to copper braze as well as 316/316L plate. Cleaning is worth doing when pressure drop has risen and leaving temperature has drifted. It does nothing for a unit that is leaking between circuits; that one needs replacing.

Because the limit comes from the narrowest gap in the plate pattern, not from the size of the ports. The B60 has large connections and a 76.2 m3/h (335.50 GPM) ceiling, which makes it easy to assume it tolerates coarse water. It does not.

Specify the strainer screen to pass nothing above 0.9 mm and size the body for the full flow, so the clean pressure drop across it stays small. A strainer carried over from a frame rated for 1 mm is slightly too coarse here.

Each channel holds 0.223 dm3, the same on both sides. Roughly half the channels in the pack belong to each circuit, so the hold-up on either side scales directly with plate count.

On a refrigerant circuit that volume is charge. A replacement with more plates than the original needs more refrigerant, and a system topped up to the old nameplate charge will run short. On the water side a small hold-up means the unit responds quickly, with little thermal buffer when the load swings.

Whichever the nameplate shows, if this is a replacement. The six builds on file are single-pass. The published example, B60H/2P-SC-S, is a two-pass arrangement, used where a longer thermal length is needed from the same plate.

On a plate only 374 mm tall, a second pass is a real gain in temperature change, and it roughly doubles the path the fluid travels, so pressure drop rises sharply. It also changes where the connections sit. A two-pass unit will not pipe up to a single-pass layout, so the pass count has to be settled before the pipework is touched.

The frame takes up to 301 plates. The builds on file run from 20 to 60 plates, all in SC material and M pressure class, with 2" and 2 1/2" connections alternating around the four ports.

Adding plates puts more channels in parallel. Pressure drop falls, the approach temperature tightens and capacity rises. The pack also gets deeper and heavier, by 0.462 kg (1.019 lb) per plate on top of the 16.07 kg (35.44 lb) base. The ports do not grow, so the flow ceiling stays where it is however many plates are fitted. For a specific count, Request a Quote with the nameplate string.