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Thread: Question about ceiling cassettes
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07-01-2012, 01:27 PM #1
Question about ceiling cassettes
Hi Guys,
Im soon going to be working on ceiling cassettes, I would just like to know, the built in condensate pump in the cassette, how many metres can it push water without the need of a seperate condensate pump, vertically or horizontally, and what extra pumps do you recommend for long runs, also in terms of servicing, how do you access condensate pan to acid flush all hard water and also how to access filters for cleaning and coils
many thanks
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07-01-2012, 02:15 PM #2
Re: Question about ceiling cassettes
The lift from the internal pump varies between the brands and models, typically you are looking at between 300 & 600 mm but the exact height will be in the manual for your units.
The important bit is that the (condensate) pipe as it exits the cassette goes straight up to it's highest level and then slopes down from there. Also important if you got several cassettes on a common drain pipe, make sure the common pipe is below each cassette's drain's high point (to prevent one cassette pumping in to another)
If the maximum lift isn't enough or the pipe can't be routed straight up to it's highest point then another pump is needed, this can be almost any tanked condensate pump. Personally I would steer away from the smallest ones with just 1 litre tank and go for something with 4+ litres.
Access for service...
The filter will just fold down on the centre part of the facia, as to the rest it will vary.
The best you can do is to read the manual for the particular units you are about to install.
OR,
Better still,
Speak to the manufacturer/importer/supplier of the units about getting on one of their training courses. Here in UK most of them are more than happy to give unit/brand specific training.
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07-01-2012, 03:17 PM #3
Re: Question about ceiling cassettes
Thanks for your advice Viking,
So say the run from the cassette to outdoor when you want the condensate to exit is say 3metres away, from the cassette, could you not just take hard plastic condensate in a straight line away to the outdoors or would it not push in a horizontal line that far? as you said you take the pipe up about 300mm then let it drop, what sort of distance in a horizontal straight would it push the water?
Thanks
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07-01-2012, 05:56 PM #4
Re: Question about ceiling cassettes
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07-01-2012, 06:16 PM #5
Re: Question about ceiling cassettes
I get some 3mm wire rope grips (look like tiny exhaust clamps) and use them to hold the 3/4 plastic pipe clips to the ceiling wires, theres a wire every two tiles so you can use these to get to the outside wall easily, and just loosen the rope grips to slide the drain up and down to get the fall correct.
Mostly found in Oxfordshire, UK :)
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07-01-2012, 07:52 PM #6
Re: Question about ceiling cassettes
The pump's in the units are not designed for horizontal discharge hence the term "lift pump".
So even if your run is only three meters you should still utilise the lift available from the internal pump,you don't have to max it out but the greater the gravity fall you generate from the unit the less likely you are to have issues,Remember the pump in the unit is free may as well use it.
Cheers
Stu
Tool's ? check ! Condom's ? check !
If you can't fix it , f*ck it !!!
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07-01-2012, 08:03 PM #7
Re: Question about ceiling cassettes
hello post #4- over 550mm-straight up,immediatly then run your fall - i quote haha
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07-01-2012, 08:07 PM #8
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07-01-2012, 08:13 PM #9
Re: Question about ceiling cassettes
the beast is still currently under house arrest- gonna go wholesalers and get a 75mmsq 5 core swa to keep it occupied-if it was to bite me-its bye bye finger-you know what i mean haha
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07-01-2012, 08:17 PM #10
Re: Question about ceiling cassettes
Get a T-REX rat trap and put some speaker cable in it to entice the little fooker .
SNAP and he's history.
Cheers
StuTool's ? check ! Condom's ? check !
If you can't fix it , f*ck it !!!
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07-01-2012, 08:28 PM #11
Re: Question about ceiling cassettes
personally id take it bungee jumping over a motorway bridge-but apparently its the family pet-and if i ever loose me snips then it could be of use-the boss is giving it another chance before we curry it!! i will keep u updated-if you want you can sponser it-just £30 a week as its rarer than a snow leopard!haha
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08-01-2012, 07:52 AM #12
Re: Question about ceiling cassettes
except for LG. installed another one on friday (10kw) and checked the manual again (last did one 3 weeks ago and checked the manual in that too, nothing there either) but it still showed no mention of a max height for the drain.
i just keep them under 500mm above the ceiling and have no problems.
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08-01-2012, 09:43 AM #13
Re: Question about ceiling cassettes
ffs I can't believe someone hasn't already said this
generally 1 cm drop over a meter for 1 cassette with 3/4 drain line check the cassette install manual for maximum pump lift-daikins/mitsi over 550mm-straight up,immediatly then run your fall and support it every metre or it will sag if it holds water
as I am first to post the right answer I expect loads of rep for this!
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08-01-2012, 09:46 AM #14
Re: Question about ceiling cassettes
rb post 4
07-01-2012 05:56 PM#4install monkey
VIP Poster I am starting to push the Mods: of RE
Join Date Oct 2007Location manchesterAge 38Posts 1,624Rep Power7
Re: Question about ceiling cassettesgenerally 1 cm drop over a meter for 1 cassette with 3/4 drain line check the cassette install manual for maximum pump lift-daikins/mitsi over 550mm-straight up,immediatly then run your fall and support it every metre or it will sag if it holds water
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08-01-2012, 11:02 AM #15
Re: Question about ceiling cassettes
hi all i have installed ac cassettes before and tend to always use the lift if needing to get gravity for a distance. i have never knew that you can not run it out horizontally. until reading this post i have installed lots like where ran out horizontally. oops. having said that never had one call back or known of a issue because of this. in future will go up with them though.
cheers
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08-01-2012, 11:10 AM #16
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08-01-2012, 11:15 AM #17
Re: Question about ceiling cassettes
haha busted!!!
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08-01-2012, 11:47 AM #18
Re: Question about ceiling cassettes
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08-01-2012, 12:06 PM #19
Re: Question about ceiling cassettes
HAHA Monkey has taken to blowing smoke up his own arse.
MY HERO !!!
Cheers
StuTool's ? check ! Condom's ? check !
If you can't fix it , f*ck it !!!
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08-01-2012, 12:10 PM #20
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08-01-2012, 03:07 PM #21
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08-01-2012, 04:00 PM #22
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08-01-2012, 04:06 PM #23
Re: Question about ceiling cassettes
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08-01-2012, 04:52 PM #24
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08-01-2012, 05:01 PM #25
Re: Question about ceiling cassettes
Last edited by r.bartlett; 08-01-2012 at 05:05 PM.
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08-01-2012, 05:18 PM #26
Re: Question about ceiling cassettes
install monkey figure 6.1 in that installation manual. am i missing something here but is it saying they can come out horizontal certainly looks that way?
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08-01-2012, 05:21 PM #27
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08-01-2012, 05:35 PM #28
Re: Question about ceiling cassettes
https://rapidshare.com/files/1121286...all_manual.pdf;
daikin cassette manual- page 2 rise within 300mm and 675mm maximum lift
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08-01-2012, 07:17 PM #29
Re: Question about ceiling cassettes
can sleep easier now install monkey thanks :-)
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08-01-2012, 07:43 PM #30
Re: Question about ceiling cassettes
10yr ago i fitted a daikin 600sq cassette in my old bosses extension- 5kw he drylined his ceiling around the unit-didnt have much space as it was a pitched roof, due to the he knows best on how to run pipework- i had to fit a little giant 2ltr tank pump on top of the cassette, as the 3/8 braided hose terminates outside at low level,he has been exposed to the syphon effect-gurgling when the pump stops- thats if his pump hasnt died from being exposed to elephant snot syndrome- i sleep like a log haha
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08-01-2012, 08:26 PM #31
Re: Question about ceiling cassettes
is that why he is your old boss now. interested if its still gurgling me. update required!!
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08-01-2012, 08:28 PM #32
Re: Question about ceiling cassettes
the 50w spotlights have probably boiled off any condensate! he didnt fit an inspection hatch haha