CSA ANSI Z21.22a-2000/CSA 4.4a-2000 (R2014) PDF
Scope
Details test and examination criteria for:
(1) Temperature relief valves and combination temperature and pressure relief valves for use on storage tanks of hot water supply systems without heater input limitation;
(2) Valves having only pressure relief features for use on storage tanks of hot water supply systems with inputs up to and including 200,000 Btu per hour;
(3) Automatic gas shutoff valves and devices; and
(4) Vacuum relief valves.
