Installation Made Easy by Honeywell
The manifold side of the gas valve is a ½ inch, but the kit comes with a ¾ inch flange if the manifold side of the gas valve requires ¾ inch. The gas supply side of the gas valve is a ¾ inch, but Honeywell includes a ¾ inch to ½ inch reducer bushing.
That makes it possible to use the include gas valve for either ¾ inch pipe or ½ inch black iron pipe. The most difficult part of the installation for me is usually not the piping or even the wiring but getting the pilot burner in the correct position to light the main burners.
The pilot burner is usually installed in a tight space, and you have to get it exactly right, so the main gas burners light right away when the main valve in the gas valve opens to feed gas to the main burners. We do not want any “whoosh” main burner ignition.
That means the pilot light is too far away from the main burner. That allows gas build-up, which can be dangerous. Make sure you get the pilot light in the recommended position per the manufacturer’s recommendations or guidelines.
Installation Tips
A few installation tips and features include the control only needs to be supplied with 24 VAC – no line voltage needed – you tap into the 24-volt transformer that should be with the boiler. Make sure you wire through all the safeties, so the control loses power when one of the safeties trips.
When the controller loses power, the burner shuts down. Always follow all the instructions when installing anything. Good luck with any future upgrades you decide to make concerning this retrofit ignition control kit.
Honeywell Y8610U6006 Gas Valve Intermittent Pilot Retrofit Kit Available here

Changing a Standing Pilot Boiler to Electronic Ignition