While in the caravan last week the warm air heating was ineffective in the cold weather even with both gas and electric on full. The van is a 10 month old Lunar Lexon. The problem appears to be that nearly all the warm air ducting is outside the caravan as is also the case with this year's Lunars. We have been away in cold weather many times in the past and never been cold. Previous vans have had the ducting mainly inside and ran off only one fuel source.
Is there any known cure eg lagging for the ducting, or anything else that would not affect the warranty?
Try going back to dealer or Lunar, the short distance of external pipe should not cool the warm air, as most ducting is foil lined or insulated - if not at 10 months old - its there problem, not yours! We have a 2007 Lunar and we found that turning the speed of the fan up too soon was a mistake, keep the fan low for a good 10 mins to build up heat and then let it rip! and after that it was piping hot!
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We used our ranger 520-4 last weekend for the first time. To start with it was freezing as everything inside the van was very cold. Had the electric & gas on full for ages but didn't really warm properly.
Next morning we found one of the frot window latches was on night position so it was letting in a cold draft. After closing it properly it warmed up quickly and stayed warm for the rest of the stay.
It's important to keep the heating on if you go out and leave it on lowish at night. If the van cools down too much it takes a lot of reheating. Also don't put the fan on for half an hour at least.
Its not just a short length of pipe outside (as in my last van - aBailey Indiana) but most of it, I will try your method as we did tend tend to give it full speed at top heat.
We were at Ferry Meadows last weekend and it was very cold too. It was only about 3 or 4 degrees during the day. We have found - then and in the past, that the caravan does take a long time to heat up at first so we tend to plug in our little fan heater to help the process. But once there (after a couple of hours !!!) the blown air heating keeps it toasty on it's own. We tend to leave the blown air heating fan on Auto. And as stated above - we leave it ticking over when we go out too, otherwise it just takes too long to heat up again !
I got lunar freelander put the main switch to 2k then put the temp setting to 9 then when u feel the heat on the fire put the blower switch. To auto and set to number 2 max. U should not have to wait until toastie when warm enough turn heat setting down till u hear it click and then just put up again just after the click and u should be warm enough. I am in my van most of year never a problem. Mind u took me ages to Suss it out
The above advice works for us as well in our Lunar Delta
turning the fan up above 2 just draws in to much cold air from outside also fitting a remote thermostat for the heater as advised by Arc Systems keep the temperature more constant.
I think the problem here is these excessive lengths of ducting outside, more than a metre and a half which is not already insulated in a second black outer duct, will loose a lot of heat.
This last new year I checked the temperature from the rear bathroom vent, it was 42C, front vents fed by internal duct around 55C. The rear duct underneath is 2.5m long, it already had the outer insulation and I managed to quickly insulated half of it using 3 inch strips of camping sleeping mat and gaffer tape.
Doing half is not the best idea but result was still an impressive 5deg increase at the outlet and obviously more to be gained yet.
Screw-fix among others do something called 'Spiral-wrap' insulation which should do an even better job quicker and easier I'd think as well
Although the ducting is foil lined inside for insulation we fine that the ducting loses lots of heat, so I wrapped all the internal pipes in another layer of foil and found it did make a difference. The external ducting on ours is quite long, so I have a foil space blanket which I'll use to wrap that, then I'll see if I can slit a plastic pipe lengthways to keep that water off and slip it over the wrapped duct and seal that off, fixing it to the bottom of the 'van.
I got some of that sponge backed foil used under laminate flooring and cut it to size to fit under all the lockers, laying carpet samples over that, and that made a huge difference last winter. I did under the removable carpets in the living area too and they sit quite well and stop the carpets sliding around.
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When we got our van last year my hubby did the same as Arcsystems did, got an old camping mat (the red and blue type), cut it into strips and wrapped them round the external ducting, fixing it with duck tape. Not an easy job lying flat on your back, it took him ages, but we feel it was worthwhile if you go out in winter a lot. We also have a mini oil filled radiator to plug in as well to help the trumatic heater.
Quote: Originally posted by powerjohn on 11/2/2010
The daftest part of the heating in our Avocet is that the fan keeps blowing even when the thermostat switches off the heat!!! Is this common?
Have you got the 'van set to 'Manual' rather than 'Auto'.
I think the problem here is always the automatic fan control is not fully integrated with the electric control. The fan is totally reliant on air temperature cooling before it can react and slow down, hence there will always be some delay.
However if it's seems excessive and begins to blow uncomfortably cool without apparently slowing down, then perhaps something else is amiss, first possible is the sensor itself is wrapped in a cosy blanket of fluff.
You can find the sensor behind the black plastic box on the back of the fan housing, it's on the little circuit board in a red rubber cover.
While your at it, it will probably also be worth cleaning the fan itself as this is often clogged with fluff.
Our heater & fan etc is on a sideboard type unit with a cupboard each side. The cupboards are baking hot when you open the doorsw so there must be a lot of heat lost behind the heater as well.
Our Pageant Burgundy is much warmer in the back than the front, because the duct goes under the van to pass the door! Shower compartment is really warm!
We have caeramic element fan heater which warms the van very quickly as all the heat is direct from it, if it is very cold we use that instead, also good in the awning!
Getting a Pegasus soon, apparantly they are much warmer!
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