CSA ANSI Z21.42:2013 pdf download.Gas-fired illuminating appliances
5.2 Test gases
In conducting the performance tests specified herein, gases with characteristics approximately as shown in Table 1 shall be used.
a) Appliances for use with natural gas shall have the tests specified herein conducted with test Gas A. Additional tests shall be conducted with test Gas G at normal inlet test pressure with no change whatever in the natural gas adjustments, and shall comprise those tests specified in Clause 5.5, Burner operating characteristics. Compliance with these supplemental tests does not imply that the appliance has been examined under this standard for use with LP gas-air mixtures.
b) Appliances for use with manufactured gas shall have the tests specified herein conducted with test Gas B.
c) Appliances for use with mixed gas shall have the tests specified herein conducted with test Gas C.
d) Appliances for use with natural, manufactured and mixed gases shall be tested with test Gases A and G as specified in Clause 5.2(a) and test Gas B.
The tests specified in Clauses 5.4, Combustion and 5.5, Burner operating characteristics shall also be conducted with test Gas C only: (1) when the appliance is equipped with different burners for natural and manufactured gases, or (2) when a third burner is supplied specifically for use with mixed gas. In the former case, the burner equipment employed for the mixed gas tests shall be that specified by the manufacturer.
e) Appliances for use with liquefied petroleum gases shall have the tests specified herein conducted with test Gas E. The tests specified in Clause 5.5, Burner operating characteristics shall also be conducted with test Gas D with no change whatever in burner equipment.
f) Appliances for use with butane gas shall have tests specified herein conducted with test Gas D. The tests specified in Clause 5.5, Burner operating characteristics shall also be conducted with test Gas E with no change what-ever in burner equipment.
g) Appliances for use with LP gas-air mixtures shall have the tests specified herein conducted with test Gas H. The tests specified in Clauses 5.4, Combustion and 5.5, Burner operating characteristics shall also be conducted with test Gas F without change in the appliance except for main burner and pilot orifices and air shutter adjustments.
h) When use with more than one type of gas is desired, the tests outlined in Clauses 5.7 and 5.12 need be conducted with only one test gas provided there are no changes in the appliance or input rating which, in the opinion of the testing agency, would affect the results of these tests.CSA ANSI Z21.42 pdf download.