VI. Installation: Piping Flush, Purge
Piping Flush
Purpose: It is common for the construction process to leave debris in the piping between the chiller
and the application. This must be cleaned out of the piping prior to startup.
To flush the piping, follow procedure below.
1. Close supply and return ball valves.
2. Remove caps from flush ports and connect external water hose to each flush port.
3. Flush piping with external water until water runs clear.
4. Close return side flush valve and apply 100 psi gas for 30 minutes to check for leaks.
5. Repair any leaks and perform flush again.
Piping Purge
Purpose: The piping should be purged of the fluid used for the flush. This ensures a clean piping
system that is not contaminated.
To purge the piping, follow procedure below.
1. After a successful leak check, open all drains including those installed on piping rise.
2. Use compressed air or nitrogen to eliminate water from lines.
3. Close all drains and purge isolation valves.
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