Purging And Priming The System - Rinnai 37AHA Series Training Manual

Purging and Priming the System

For proper pump performance and circulation, the air handler plumbing loop must be purged
of air upon initial startup.
While there are various methods and products to optimize priming, Rinnai suggests the
installation of a Taco 4900 Series Air Separator. The Air Separator will also work as a
maintaintence device to purge air from the system.
The 4900 Series does not have to be installed at the highest point of the plumbing system as
with other air separators.
Rinnai 37AHA series air handlers can be piped without the need for a "purge cart" to fill the
system and remove the entrapped air bubbles. See the installation guide for details.
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Rinnai Corporation Hydronic Air Handler 101 Training Manual