I should really says he problem is the contactor that was in it is the wrong one someone has put in it, it's a 10A contactor with the phases jumpered and it's basically done.
My question is what size should I use?
A similar machine (about 4posts below this is the thread) had a abb a16 30 10 used but what coil voltage do I need to get? 24v?
There should be a smaller transformer somewhere in the machine. This should produce the low AC voltage for various parts of the machine (gas valve?, pcb input ect) You could do as the other chap done and bypass the contactor, then operate the trigger and measure the voltage going to the wires that fed the contactor (will probable be a pair of thinner wires to other) most likely 24 to 30 vAC. See what the gas valve is marked up as. Then you need a contactor rated at or better above the max current the machine will draw. Is it a 3phase or single phase(jumper-ed?) machine?
Thanks mike, it's 24V so I actually managed to get an abb A26-30-10 with a 24vac coil for half the price of the A16-30-10.
I'm looking forward to getting it, I want to get it installed and working again now