Janitrol heater

[hharney]

The normal aspirated Skymaster has the heat exchanger feature. Only the Turbo and the P models use the combustion heater.

[rmorris]

Originally Posted by hharney

The normal aspirated Skymaster has the heat exchanger feature. Only the Turbo and the P models use the combustion heater.

I'm ?? guessing ?? it has to do with trying to heat exchange at flight levels, but what about lower? Seems that the turbo should be able to be set-up with a heat exhanger and then switch over to combustion if for some reason you get high and exchanger doesn't function.

Anyone out there ever tried to set up a turbo or p with heat exchanger type heat in lieu or in addition to the combustion model?
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Puma

[JeffAxel]

Originally Posted by rmorris

I'm ?? guessing ?? it has to do with trying to heat exchange at flight levels, but what about lower? Seems that the turbo should be able to be set-up with a heat exhanger and then switch over to combustion if for some reason you get high and exchanger doesn't function.

Anyone out there ever tried to set up a turbo or p with heat exchanger type heat in lieu or in addition to the combustion model?

never tried this, but the P210 uses heat off the exhaust thru a heat exchanger. Worked fine down to -30 or so in my experience. Simple and lightweight. I wonder why Cessna didn't change to this on the later models?? The C&D heater works well though.

[Kim Geyer]

The T337H has a heat exchanger and only uses the heat from 2 cylinders. I guess it works good because the pilots don't whine about being cold.
Kim

[Paul Sharp]

I replaced the heater in my T337B two years ago with an O/H'd one from Janitrol ("Kelly Aerospace" now) and it was just under $2K through Harold Haskins (Dothan, AL). It was a totally new core and parts so while it was an "overhauled" heater it really is new now. I pulled the old one out and put the new one in and then my A&P's finished up one dififcult part of the process that was giving me some trouble and signed it off (less than $200). I spent half a day getting it out and half a day getting the new one back in. For certain steps of the in and out process it was really a 2-man job, and I had a good friend help for a couple of hours.

I can't get too excited over that endlessly quoted line "why light a fire" in the airplane for heating stuff. The heater works fine, it does the job, and if the other type had worked well at the time they designed the T's and P's I suspect they'd have used that instead. My A/C is certificated to 33K feet, and it needs a good heater when you get high and cold.

[rmorris]

Originally Posted by Kim Geyer

The T337H has a heat exchanger and only uses the heat from 2 cylinders. I guess it works good because the pilots don't whine about being cold.
Kim

Kim,
You suppose there is a way to convert to the 337H set-up and eliminate the Janitrol heater?
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NASH 600 SPECIFICATIONS

[Kim Geyer]

The cost of a T337H Fwd exhaust system is 4K-5K then you have the ducting and control valves It will be much more cost effective to buy a new heater or two. The biggest problem with a Janitrol heater was getting a cracked combustion chamber and everyone expiring from CO posioning. But a heater/muffler type system will do the same thing.
Kim

[Rick Gardner]

Can the Janitrol heater be removed on a P model? We operate 100% of the time in the Caribbean, Mexico and Ceentral America. Never have a problem being too cold.

I would like to permanently remove the Janitrol and get rid of some of the space consuming plumbing. However, we want to do it correctly and legally. Are there any options?

[rmorris]

OK, my Janitrol heater has now failed the decay test and is removed by the a&p doing other work on my front engine. Curious on options others have done. I need heat (turbo I usually fly high, and it has been very cold recently without a heater at 21K in November .

Looking for cost effective options, because I am already having to handle an engine overhaul right now in the pocketbook.

Again, looking for all options and comments please. either her, or email me at rmorris@agsi.us

Thanks,
Robert