Replacing a L192.02 with a new L192.03 does not require any special procedure, with a few exceptions.

Please take note of these PARTICULAR CASES:

Linea Mini steam boiler: the new L192.03 valve must be installed with the new copper tube A.2.017 (no copper washer needed). Although maintaining same part number, older A.2.017 tubes had G1/4''-G1/4'' connections, while currently in use ones have G1/4''-G1/8'' connections, to allow for installation of the new valve. 

Proportional steam valve (Strada AV-EE-EP, Strada EP 1gr, Leva X, Leva 1gr): the new L192.03 valve must be installed with the new fitting A.5.154. While the previously used fitting (A.2.003.01) had G1/4''-G1/4'' connections, the new A.5.154 fitting has G1/4''-G1/8''connections, to allow for installation of the new valve.