Coleman 7900b Presidential Electronic pilot retrofit , also any service bulletins

Try you local York/Luxaire/Coleman supplier.... *if* there is a retro kit available, they should be able to find the correct part number(s) Assuming that the furnace is standing pilot now, at the least...you will be looking at a minimum of a gas valve, control module/board, ignitor, flame sensor, and wiring harness. You might have a problem with the modification if it wasn't available for that particular furnace when it was manufactured.... not only for parts availability, but also for the UL listing, and insurance purposes. This isn't for a trailer, is it??

You might be better off just doing a furnace change-out.

Yes it's for a trailer. They really want a heat pump . I was going to retro fit it . till I get the time to replace the system

Set them up with dual fuel....gas furnace and the heat pump.... best of both worlds and real easy to do.

As long as YOU are paying for it.......knock yourself out. Its a big waste of money though considering the age of the furnace and the money/parts involved. Get them a new furnace and have a pro install it. Bubba

I thought I might be able to buy a retrofit kit. Yes I'm paying for it. They're scared of lighting the pilot . They had one bad exp. I pay

Suggest best to swap the thing out ( or get a pro to do this for you if your time is at a premium ) for a newer, ( more efficient ) gas furnace--and at that same time then also add a coil box for your eventual heat pump install.

Disclaimer :

The existing ductwork may well not even be large enough to handle the cfm airflow that's required for heat pump operation anyways--and so this all serves as pretty darned good incentive to get a pro out there so as to at least get some ballpark quotes / info as far as how to best proceed since your wanting to eventually add a heat pump.

honeywell, robershaw and white rogers all offer cycle-pilot, intermittant pilot conversion kits for standing pilot systems.

i've seen them installed in just about every kind of hvac equipment imaginable. most kits contain everything you need, and someone who works in the field shouldnt hav e too many problems installing such a kit. Johnstones Honeywell kit is L38-263 or L86-058. Johnstones Robershaw kit is L36-962 or L38-185

Another thought is to add a Robertshaw automatic pilot relight kit, L38-127. Take 24v thru a momentary (push button type) switch to the relight module. I got some of these installed on duct furnaces, where re-lighting the pilot is a major pain in the ass.

Still a waste in my opinion but "whatever floats your boat". Look in a Johnstone catalog

I can use a Robertshaw kit and a 3 wire valve . I can make anything work . I just want it to be safe . I'll do a change out asap. Thanks

You could call your HVAC warehouse, and ask em.