Water Connection Sizing Considerations; Galvanic Corrosion Considerations; Water Treatment Considerations; Making Water-Cooled Condenser Connections - AEC A0551794 RS Series Manual

Water Connection Sizing Considerations

Note:

Galvanic Corrosion Considerations

Water circuit piping components are primarily ferrous (iron) and react electro-chemically
with non-ferrous metallic materials such as copper. Some water has dissolved minerals that
will greatly accelerate the reaction between dissimilar metals.
Use PVC or ferrous piping to minimize galvanic action. If piping must be copper, use
dielectric unions at the chiller.

Water Treatment Considerations

Water treatment is important in any piping system. In some locations, raw water may be used
in the system without problem; in other locations, it will result in large deposits of scale and
corrosion.
We offer a complete line of water treatment equipment. Contact your sales representative for
water testing and treatment options.

Making Water-Cooled Condenser Connections

Screw compressor water-cooled chilling stations use city or tower water as a cooling
medium. All external condenser supply, discharge piping and connections should be of
adequate size. Water regulating valves are not required on the Screw Compressor Chiller if
the tower water does not fall below 65°F (18ºC). Water flow must be adjusted based upon
the pressure drop in the following table on the next page.
Two connections are made to each unit:
Condenser Water In
The optional condenser water manifold allows one-point connection of TO TOWER (drain)
and FROM TOWER (city water) piping. Sch. 40 steel include butterfly valves for each
condenser.
The city or tower water supply inlet is located at the side or rear of the chiller.
Screw Compressor Central Chiller
Run all external chilled water connections with adequate size to the
process.
Provide the largest possible openings and passages for the flow of
chilled water through platens, dies, molds, or other pieces of
equipment.
Minimum external pressure drop is critical for proper operation.
Water pressure 25 psi ( 172.4 kPa/ 1.72 bars)
Water temperature 85°F ( 29ºC)
Chapter 3: Installation 21