Proper Cleaning Procedure for the Brazed Plate Evaporator

The brazed plate evaporator is made of stamped stainless steel plates, furnace brazed together with copper based joints.

• The complex geometry of the flow passages promotes turbulent flow which gives high efficiency and reduces fouling by mineral deposits.
• Large solids (plastic pellets, chunks of mineral deposits etc.) will collect at the water inlet port or the evaporator and restrict flow through some of the passages.
• If this possibility exists, the factory recommends filters or strainers to installed in the from process line.
• If the evaporator becomes fouled there are several methods for cleaning the evaporator.
• If there are mineral deposits adhered to the plates, the evaporator must be backflushed with a mild acid solution (5% phosphoric, or5% oxalic acid is recommended.

• Turn off all power to the machine.
• For water chillers with a reservoir tank, drain tank to below the evaporator outlet. For water chillers without a reservoir tank, drain total unit.
• Remove the piping to the water in port at the evaporator, if there are solids at the inlet remove them.
• Connect a water supply hose to the evaporator water outlet.
• If acid cleaning, connect the discharge hose from the acid pump to the evaporator outlet port.
• Connect a hose to the evaporator water supply port and to an appropriate containment vessel.
• If acid cleaning, connect the evaporator water inlet port to an acid solution reservoir tank. Dispose of all backflush water according to local codes.
• Your water supply source should have at least 20 psi available.
• If acid cleaning, follow the instructions supplied with the acid solution carefully.
• After cleaning, rinse with clear water before returning to service.
• Once finished, reinstall all water line to original factory orientation.
• Restart the unit and check for proper operation.