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What do you have for a LWCO?
Is the water feeder new or existing?
If your gas valve had those terminals then you have/had a millivolt system. So you need a 24 volt transformer to make this work. Do you have a transformer?
There is an additional charge for a phone call. My screen shows a payment failure. I'm not allowed to call you unless the payment clears. It may just be a glitch but we can continue here if you like or if you still need a call let me know
Is this steam or hot water? The 4 series was steam originally. Your old gas valve was millivolt not 24 volt so this will require some rewiring.
Yes and I also installed the Burnham 4 series 20+ years ago when it was still in production. Please read my last post
This can be done but it's not as simple as you seem to think it is. I can tell you how to do this but I'm blind here and I need to know what you have. So far your info doesn't add up so I'm thinking some info is missing. You keep mentioning a water pump for what usually is a steam boiler. Steam boilers don't have water pumps. How about some pictures of your boiler and the controls? Click on ADD FILES next to the SEND button to post pics here.
I have to step away for a while. I respond when I get back
Ok, I won't be back for at least an hour
Ok, you need to connect one lead from the transformer in your 2nd pic to 24 gnd on the ignition control. Then one thermostat lead to the other transformer terminal. The other thermostat lead to TH-W on the control. You should have 2 thermostat leads at the old gas valve. Also run a lead from the transformer terminal connected to the thermostat to 24v on the ignition control.