AEC ACOA Series Air-Cooled Central Chillers - Manual (Page 23)

3-3 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 greatly
accelerate the reaction between dissimilar metals.
Use PVC or ferrous piping to reduce galvanic action. If piping must be copper, use dielectric
unions at the chiller.
3-4 Water Treatment Considerations
Water treatment is important in any piping system. In some locations, raw water can be used in
the system without problem; in other locations, it may result in large deposits of scale and
corrosion. Water that is corrosive, high in mineral content, or contains entrained solids can
reduce chiller efficiency and destroy evaporators.
AEC, Inc. offers a complete line of water treatment equipment. Contact your AEC, Inc. Sales
Representative for water testing and treatment options.
3-5 Making Process Water Connections
ACOA chillers have two chilled water connections per circuit:
TO PROCESS
The
TO PROCESS water connection is the chilled water supply outlet (located closest to the
expansion valve) leading to the process being controlled.
FROM PROCESS
The
FROM PROCESS water connection is the chilled water return inlet for water returning back
to the chiller from the process to be cooled and recirculated.
3-6 ACOA Refrigerant Charge Considerations
ACOA chillers are charged at the factory with the refrigerant for which they were designed. The
type and amount is listed on the serial tag.
Page 22
ACOA Series Air-Cooled Central Chillers