!
Caution
The boiler and its individual shutoff valve must be disconnected from the gas supply piping
system during any pressure testing of that system at test pressures in excess of 1/2 psi
(3.5 kPa).
The boiler must be isolated from the gas supply piping system by closing its individual man-
ual shutoff valve during any pressure testing of the gas supply piping system at test pres-
sures equal to or less than 1/2 psi (3.5 kPa).