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LP Conversion

BW
BW Member Posts: 5
Converting a Teledyne Laars boiler to LP-I have the LP spring for the Honeywell gas valve .I am trying to find out what size orifice is needed. Model# JVS75N DI
Input-75,000
Heat Cap.- 63,000
Existing orifice-43
Thanks in advance for any help.
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