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#1
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Janitrol heater
Two questions:
1) Has anyone taken advantage of the C&D special show pricing and put in their heater replacement. If so, what was the cost of the heater, and what was the cost of the labor to swap it out. pirep on it? 2) IO've looked throughout my POH and can not seem to find the fuel flow requirement for the Janitrol heater on my T337C. I understand my new JPI fuel flow gauiges will not reflect the fuel used by the heater and I want to makie sure I'm calculating actual burn with the heater turned on...anyone have the fuel flow numbers? -Robert Morris rmorris@agsi.us ________ FORD VERVE CONCEPTS Last edited by rmorris : 03-12-11 at 11:59 AM. 
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#2
12-31-08, 08:12 AM
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'Nother heater question:
We're not too impressed with the idea of starting a fire in the nose of our T337C for heat - a muff-type heater, or an electric heater, sounds much better. We've been unable to find a drop-in electric heater replacement for the combustion heater, or a muff-type heater to put around an exhaust stack - has anybody heard of any of these options for a T337C? Or is the C&D replacement combustion heater truly the only realistic alternative?
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Paul T337C
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#3
12-31-08, 08:30 PM
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How many incidents have been caused by the combustion heater? I have not ever heard that using these is a danger. I agree that having one of these units on fire producing heat while flying across the country could look and seem like a hazard. But these are proven appliances and with proper maintenance and use will be fine. There are a large amount of GA aircraft that have these units and you just don't hear about planes falling out of the sky. I did a quick search on the FAA site and only found 2 incidents and one of them didn't say anything about the heater. If there are more incidents that I am not finding here please pass them on to this thread.
http://www.ntsb.gov/ntsb/brief.asp?e...22X02072&key=1
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Herb R Harney 1968 337C Flying the same Skymaster for 47 years
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#4
01-01-09, 01:14 PM
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Yeah, you're right - there probably aren't that many crashes caused by combustion heater malfunctions. Maybe it's the psychological aversion to the scenario - drifting peacefully off to sleep under the influence of carbon monoxide somehow doesn't seem as bad.
Of course, electric heaters risk electrical fire, and muff heaters risk carbon monoxide poisoning (although a good digital read-out carbon monoxide meter with alarm would mitigate that risk). I wonder how these three heater options compare in terms of crashes per 100,000 hours flown? Maybe combustion heaters are actually safer than muff-type heaters?
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Paul T337C
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#5
01-01-09, 05:20 PM
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why the combustion htr on a push-pull?
Sorry, but I just don't understand the thinking by Cessna engineers, nor why no one has made a modification through field approval or STC to remedy it.
The reason a combustion heater is necessary on most twins is simple - the engines are out hanging under the wings, so very inefficient to try and pipe that excess heat through an exhanger into the cabin. Our engines are not out under the wings- we have one right in front of us - just a like a single engine design. On single engine airplances it is a simple process to set-up a heat exchanger type system, no extra fuel or flame needed, to get heat into the cabin. You still have to have proper carbon monoxide detectors and sound exhaust system checks done under any system. Why not just heat the Skymaster the way a single engine plane does it? Has anyone ever tried to use a mod that gets nice engine heat into the cabin and eliminates the combustion heater? ________ Washington Dispensaries Last edited by rmorris : 03-12-11 at 12:00 PM.
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#6
01-01-09, 08:26 PM
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The normal aspirated Skymaster has the heat exchanger feature. Only the Turbo and the P models use the combustion heater.
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Herb R Harney 1968 337C Flying the same Skymaster for 47 years
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#7
01-01-09, 09:38 PM
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Quote:
the combustion heater uses 2.25lbs/hr on fuel, and draws it from the same tank as the front engine (left). As to the C&D heater, I swapped my old one out at the last annual. The new one actually works, the old one didn't. Be sure whoever does this for you actually reads the installation procedures and follows the checklist and checks that everything is set up properly, and then tests it at altitude. It seems that if the fuel pump for the heater is not up to spec, the heater won't light at altitude. Don't ask how I know! The folks who did this for me hadn't done this before, and didn't do it very well or very efficiently. The total cost was $6800. I won't be going back to this shop. The heater works well though, once it was set up properly.
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#8
01-02-09, 06:37 AM
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Quote:
This is the service bulletin that describes the changes to the basic installed heaters: http://www.kellyaerospace.com/servic...-101_Rev_D.pdf
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#9
01-02-09, 09:01 PM
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Quote:
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#10
01-03-09, 07:56 AM
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Quote:
Think about it, 1/3 gph? That is so absurd that this is why a red flag popped up. Skymaster, Seneca, Seminole, Baron are all comparable sized cabins as far as cubic foot areas, so they all have the same size/family of heaters.
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#11
01-05-09, 06:35 PM
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turbo -v- aspirated
Quote:
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? ________ Puma Last edited by rmorris : 03-12-11 at 12:00 PM.
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#12
01-06-09, 02:33 PM
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Quote:
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#14
02-17-09, 10:09 PM
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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. Last edited by Paul Sharp : 02-17-09 at 10:14 PM.
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#15
03-14-09, 09:47 AM
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heat exchange
Quote:
You suppose there is a way to convert to the 337H set-up and eliminate the Janitrol heater? ________ NASH 600 SPECIFICATIONS Last edited by rmorris : 03-12-11 at 12:02 PM.
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