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Old 09-11-2012, 12:54 PM   #1
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Refrigerator on incline

Almost always have refrigerator on level both directions.....it runs 24/7,
however occasionally trailer is parked on a 4-5 degree incline to the rear,
level side to side....for 24 to 48 hours....no ill effects on cooling, but is this enough to do damage over time....please share some thoughts thanks
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Old 09-12-2012, 03:03 PM   #2
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Depends of course on the location of your fridge.
If mounted on back wall; side to side is the critical axis.
If mounted in side wall; front to back is critical.

IMO, 5 degrees out of level in a critical axis will overheat your boiler stack over time and cause early failure. How much earlier depends on how often and how long.
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Old 09-12-2012, 03:56 PM   #3
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Quote:
Originally Posted by sail2liv View Post
Almost always have refrigerator on level both directions.....it runs 24/7,
however occasionally trailer is parked on a 4-5 degree incline to the rear,
level side to side....for 24 to 48 hours....no ill effects on cooling, but is this enough to do damage over time....please share some thoughts thanks
This quote was published by Dometic in 1989. This is from a diagnostic manual for their absorption refrigerators. Heretofor operator must use a spirit level in the freezer floor to ensure the unit is level. The requirement now is less severe and just as interpreted. However it is less severe and damage to cooling unit is much less probable

"
In recent years Dometic has engineered a new
type of cooling unit that utilizes an improved
siphon pump tube design which drastically
reduces the possibility of permanent damage to
the coils if operated in an out-of-level condition,
or too much heat is generated at the boiler
section. As we can see from this drawing, the
siphon pump tube is enclosed in the design
and is surrounded by a weak ammonia solution,
which will protect the pump tube from abnormally
over-heating. This type of unit; however,
does not eliminate the need for proper leveling.
The unit still requires gravitational flow to
provide the proper cooling process, and if
leveling is outside the necessary limits, cooling
will dramatically slow down or stop completely.
The cooling coils are not normally damaged in
this fashion and once proper leveling is maintained,
the cooling process will resume.
(20)
Spirit or bubble levels are no longer being
supplied with the new style refrigerators as the
RV or vehicle only needs to be leveled so it is
comfortable to live in, with no noticeable sloping
of the floor or walls. For diagnosis, the new
style cooling units that incorporate the
protection boiler system, can be differentiated
from the older style coils by the shape and
design of the outer boiler box cover on the rear
of the cooling unit. These units will incorporate
a circular metal cover,"


In other words if you can stand comfortably its probably ok. More critical now is ensuring sufficient cooling flow across the condenser.
If that is overheated in excess, damage to unit and circ fluid will occur
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Old 09-12-2012, 04:46 PM   #4
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I am thinking 4-5 degrees out of level would be "noticable."
TAN (Theta) = opposite / adjacent
TAN (5) times 30 foot camper is 2.6 feet out of plumb.
TAN (4) times 30 foot camper is 2 feet out of plumb
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Old 09-12-2012, 05:09 PM   #5
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Quote:
Originally Posted by dunnnc View Post
TAN (Tangent)

SOH CAH TOA Sine=opposite/hypotenuse Cosine=adjacent/hypotenuse Tangent=opposite/adjacent.
Not sure what that was about. Only needed Tangent to solve for feet out of plumb. Did I use the function wrong? Adjacent would be length of camper in feet and opposite would be feet out of plumb.

Ah, you were editing it when I saw it.
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Old 09-12-2012, 05:14 PM   #6
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Ya'll are speaking some kind of foreign language aren't you?
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Old 09-12-2012, 05:23 PM   #7
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Quote:
Originally Posted by herk7769 View Post
I am thinking 4-5 degrees out of level would be "noticable."
TAN (Theta) = opposite / adjacent
TAN (5) times 30 foot camper is 2.6 feet out of plumb.
TAN (4) times 30 foot camper is 2 feet out of plumb
Agree Herk, Big time noticeable and in my opinion, way too far out of level to be comfortable.

TAN (Tangent)

OK, you are saying tanϴ = TAN (Theta)


SOH Sine=opposite/hypotenuse
CAH Cosine=adjacent/hypotenuse
TOA Tangent=opposite/adjacent.
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Old 09-12-2012, 05:25 PM   #8
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Originally Posted by dunnnc View Post
Agree Herk, Big time noticeable and in my opinion, way too far out of level to be comfortable.

TAN (Tangent)

OK, you are saying tanϴ = TAN (Theta)


SOH Sine=opposite/hypotenuse
CAH Cosine=adjacent/hypotenuse
TOA Tangent=opposite/adjacent.
I misread it thinking you were saying TAN meant Theta. DUH!
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Old 09-12-2012, 05:27 PM   #9
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Ya'll are speaking some kind of foreign language aren't you?
I think it use to be called trigonometry and the functions of a triangle, but nowadays, who knows?
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Old 09-12-2012, 05:37 PM   #10
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Originally Posted by herk7769 View Post
Not sure what that was about. Only needed Tangent to solve for feet out of plumb. Did I use the function wrong? Adjacent would be length of camper in feet and opposite would be feet out of plumb.

Ah, you were editing it when I saw it.

Think it is called "Foot in Mouth" Herk. Sorry about that.
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Old 09-12-2012, 05:49 PM   #11
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Huh?? I ddn't think he's using a protractor, I guess its not too bad at whatever angle his is at, thats the reason for the Dometic article. So how much taper is 3 deg over 30' or is it the 3' of the reefer base ie the effective lengh? High Scool Trig was so long ago I've reused those memory cells three times over! I guess without calculating the coils might be out of level 1/8". Dometic is trying to tell us don't worry bout it.
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Old 09-12-2012, 05:57 PM   #12
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Huh?? I ddn't think he's using a protractor, I guess its not too bad at whatever angle his is at, thats the reason for the Dometic article. So how much taper is 3 deg over 30' or is it the 3' of the reefer base ie the effective lengh? High Scool Trig was so long ago I've reused those memory cells three times over! I guess without calculating the coils might be out of level 1/8". Dometic is trying to tell us don't worry bout it.
And the answer to your 36" question is 1.88"

Tan 3į x 36"=1.88"
Which means the top of the frig would be tilted 1.88 off vertical and the boiler wouldn't be that much out of level. But, without knowing the width of the burner, it is just swag.
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Old 09-12-2012, 06:00 PM   #13
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Don't worry 'bout it. They sell'em all the time!

If you stand up and you feel like you are at an angle, you probably are. That's what blocks and boards are for. Play it safe and get on the level.

Now if money is no object....
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Old 09-12-2012, 06:29 PM   #14
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Originally Posted by Timex View Post
Ya'll are speaking some kind of foreign language aren't you?
Yes, the "universal" language.
Well, at least that's what my Math teacher told me.
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Old 09-12-2012, 06:54 PM   #15
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Yes, the "universal" language.
Well, at least that's what my Math teacher told me.
Good one Herk, my hs trig teacher called all the kids that didn't take advanced algebra and trig, "poor dumb civilians" and that was back in 1954.
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Old 09-12-2012, 08:55 PM   #16
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Brag, Brag, Brag!!

They didn't teach trig when I graduated; the 8th grade!

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Old 09-12-2012, 09:13 PM   #17
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For the numbers

Pin to bumper 28 feet......Fridge center about 13 feet from pin....harbor freight magnetic protrator on bumper with needle settling between 4-5 degrees....unit is not at all uncomfortable to be in under this condition....
fridge cools same a when level....5 foot level on entry steps at rear of trailer raised to bring bubble to center maybe inch and half....so thinking
around 8 inches difference between pin and rear bumper....would think half way point would be only about 4 inches lower than pin .....fridge on right side so not exactly sure how much slope from left side of fridge (front) to right side of fridge rear......thinking rear of fridge 1 inch lower than front at max......maybe this will help solve the math......next time I park in that spot will put a level at bottom of fridge and see the exact difference.....as always thanks so much to all the great input....and I had never thought about the side to side and front to rear in reference to where the fridge is......
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