HHT's Intellifire IPI system
It's been pretty reliable compared to standing pilot systems. There were some initial bugs but HHT flew some engineers over to China and corrected the quality issues with the Dexen valve pretty much except a few quirks.
With a standing pilot, you must first light the pilot then turn the control knob to 'on' in order to get readings at the gas pressure taps. With the Dexen, as long as the gas cock is open, you have inlet pressure at the tap. No mechanical failsafe. You cannot adjust the pilot flame with the Dexen. When converting fuels, you can swap out the burner solenoid. However, there is a relatively high complication rate on field converted valves. There is a delicate flat O ring which gets easily crushed and everyone tries to use the wrong scwer holes. Need a tamperproof Torx-T20 bit.
The new PSE pilot is much more reliable than the old Robertshaw 3 way flame, which needs a grounding strap at the right hand screw retaining the pilot assy. Needs a good ground.
If you install two D cell batteries, it will suck them dead first then look to the 110vac. Therefore, they came up with a Cabin Kit to do the switching for you. Now their new WSK 300 wall control has this function built right in. :cool:
The brown wires always are your on/off circuit and are low voltage, even with power venters and remotes or stats.
The new fan kits use a timer so the fan kicks in after 7 minutes of burning and shutoff 12 minutes after burner shutdown. However, if you elect to control it with a wall rheostat, you'll need the 14/3 in a switch loop.
In normal ignition, it will continue to spark for 60 seconds. Once good flame rectification is sensed, should it lose the signal, it will attempt to relight x 1 minute.
If you need a standing pilot for that ~1,200 BTUs behind the glass or to prime the flue so it drafts out of the starting gate, you can select Cold Climate function on the wall control or buy the kit.
This system tolerates wide swings in flame rectification. I've seen it run with 0.2 to 12.5 microamperes.
In high humidity, some units fail to get good rectification until the flame rod's non-vitreous ceramic insulator dries out. Not a problem with the PSE pilot.
Test you ground and polarity. More than about 5 mv ac on the neutral can freak it out. Did I say needs a good ground? :D
When handling, don't allow valves to be tossed around. The potting in the valve can give way allowing things to move around inside. Treat it like a precision component..............that was made in China.
IPI has been around with furnaces for over 12 yrs. now. Just when we get comfortable with this system, we'll begin switching over to UV detection.