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Thanks for reply. Both sensible routes. Especially the service inspection angle. Prevention is better than cure anyday. Do you find that one element of inspection offered by the larger HVAC service companies is sampling and analysis of refrigerant to check for evidence of moisture, acids...

Does anyone out there know who, if anyone, insures chillers against breakdown etc. In the same way that I pay motor insurance and expect a rental car should I be unlucky enough to be involved in an accident that takes my car off the road if I owned a large chiller I would expect eg a hire...

As far as the What training is required ? goes - In the UK service technicians or those responsible for ammonia refrigeration plant should have received City & Guilds 2078 Ammonia or Construction Industry Training Board (CITB) training on Safe Handling of ammonia. Contact BES Publications...

I use a program called Engineering Equation Solver (EES or Ease) that has the thermophysical property data for a large range of sunstances including R22 and will do the calculations you require.

Hi ColonelBogart, Have you considered checking out www.thecarbontrust.co.uk ? Your company may be entitled to a free energy survey. If you have a particulary large refrigeration system then the company I work for has a service that can diagnose whether or not the refrigeration system you have...