Testing Procedure

The bonnets on the charging and drain valve should be tightened down securely for the
lockdown period of the test. Minute leaks at these valves also can falsely indicate
tubing leakage.
Verification and Time
Once the system is fully charged at 80 psig, the contractor should demonstrate the
pressure readings to the project manager, engineer on site, or other authority having
jurisdiction. The time of the inspection should be noted. The pressure charge must
remain on the system for a minimum of 24 hours. The installer and the verifying agent
should inspect the gauge and verify the pressure reading on the gauge. A small
amount of pressure reduction is normal, just from the gauge movement. A maximum of
5 psig drop over a 24 hour period is acceptable. Any more pressure drop below the
original charge pressure must be thoroughly investigated and all leakage eliminated.
Once the leaks are corrected, the entire testing procedure must be repeated to assure a
totally tight system before covering.
For the protection of the Owner and the Installers a report should be recorded for each
manifold test. The manufacturer will require these records in the event of a warranty
claim.