I've been beating my head against this for a while now, and this is the only missing piece of the puzzle.
I'm looking to make a propane based HERMs system using propane for the HLT exchange, but I'm coming up blank when it comes to having the controller turn on/off the flame. I understand the use of the solenoid valves to control the level of the flame, but once the flame goes out completely, how can I be sure the pilot is lit before the gas starts flowing?
I found this, http://bostonheatingsupply.com/sp10764c.aspx
and it seems like it's the closest thing to what I'd want, but I'm not sure whether or not I could mount it properly for use on a Banjo burner. I'm open to either an open flame pilot or an electronic ignitor.
For obvious reasons, the open flame pilot concerns me due to a draft coming in and blowing it out. The electronic ignitors are known to misfire on occasion.
How are people doing this?