Sterlco GC Series Central Chiller - Manual (Page 17)

GC Series Central Chillers Chapter 3: Installation 17 of 79
3-3 Process Water Connections
All of our central chillers have two chilled water connections. The chilled water supply,
labeled “To Process” is the outlet for the chilled water leading to the process being cooled.
The chilled water return, labeled “From Process” is the inlet leading from the process back
into the chiller to be cooled and re-circulated.
Figure 1: Typical GC70-210 Process Piping Connections
All external chilled water connections should be run full size to and from the pumping
system. Flow and pressure information is available in the Appendix. Flow control valves
are supplied, and should be used to adjust flow and pressure through the chiller.
Note: Be sure to reduce external pressure drop as much as possible by generously
sizing piping.
3-4 Galvanic Corrosion Considerations
The materials used in the water module piping of these chillers are non-ferrous and react
electro-chemically with ferrous metallic materials. Some water has dissolved minerals that
greatly accelerate the reaction between dissimilar metals.
PVC or non-ferrous piping is recommended to reduce galvanic action. If iron piping must be
used, use dielectric unions at the chiller, and water treatment is required.
Note: The use of galvanized piping is discouraged because the rough inside surface
promotes debris to stick and eventually block the flow of the process fluid..
3-5 Water Treatment Considerations
Water treatment is an integral part of the system. In some locations, water may cause large
deposits of scale, erosion, algae, and/or corrosion.
Evaporator Inlet
Evaporator Outlet