J&E Hall Cellar Plus 70-S1, Technical Manual

Page: 13 / 35

Issue: 01.07.2020 Page 13
Installation
Pressure testing
Both the indoor and outdoor units have been pressure tested in the factory prior to dispatch and contain a
holding charge of oxygen free nitrogen.
Once the pipework installation is complete, it should be pressure tested prior to evacuation to test for leaks.
A pressure leak test should be carried out using oxygen free nitrogen (OFN). NEVER USE OXYGEN FOR PRESSURE TESTING
SYSTEMS. A calibrated nitrogen pressure regulator must always be used. Before starting any pressure testing, ensure the area
surrounding the system is safe, inform relevant personnel and fit warning signs indicating high pressure testing. Also, use correct
PPE as required.
Listen for any possible leaks and check all joints with bubble spray. If any leaks are discovered, release pressure slowly from
system until empty, repair leak and then restart pressure testing procedure. Never attempt to repair a leak on a pressurized
system.
A strength test should also be incorporated according to local regulations.
Once testing has been completed satisfactorily, release the pressure from the system gradually and safely to external
atmosphere.
Important Note:
Do not open the service valves on the condensing unit until pressure testing procedures have been
carried out.