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NOTICE
All Series 24 cast iron boilers are designed, built, marked and tested in accordance with the
ASME Boiler and Pressure Vessel Code
, Section IV
, Heating Boilers
. An ASME Data Label is
factory applied to each Series 24 jacket, which indicates the boiler Maximum Allowable Working
Pressure (MAWP). Each cast iron section is permanently marked with the MAWP listed on the
boiler's ASME Data Label. Those values for the Series 24 are as follows:
MAWP, Steam - 1
5 psi
M
AWP, Water (USA) - 80 psi
M
AWP, Water (Canada) - 45 psi
I
t is common and acceptable practice to install these boilers in lower pressure systems, below
the boiler MAWP. Therefore, Crown offers safety relief valves set at or below the MAWP of the
boiler. See page 9 for standard safety relief valve set pressures.