nasty51ford Posted August 18, 2014 Share Posted August 18, 2014 Hi, I have a 1958 B67T Mack with a 36" sleeper on it, there's a hole in the roof already, from what looks like was probably a roof unit it once had. I started looking for roof units, because I want to put air back in the truck (I live in Florida) and I came across Dometic 12 and 24 volt self contained units. I am familiar with the company because I helped my friend put one of their units on his Airstream, and it works great! HAs anyone had any experience with their 12/24 volt systems? It would make installing air so much easier if they work good. The website say's they are available all the way up to 13,000 BTU ! I would imagine that little Mack cab and 36" sleeper would turn into a freezer with a 13000 BTU unit! lol Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/ Share on other sites More sharing options...
Freightrain Posted August 19, 2014 Share Posted August 19, 2014 Sounds interesting. Might have to google them up.I've got my eye on an underdash unit for mine someday. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256570 Share on other sites More sharing options...
Reuhlz Posted August 19, 2014 Share Posted August 19, 2014 I've got my eye on an underdash unit for mine someday.Who makes those? Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256575 Share on other sites More sharing options...
nasty51ford Posted August 19, 2014 Author Share Posted August 19, 2014 Go to Alibaba.com, and look at the TKT-30ES for one Here's another one DCpowersales.com Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256582 Share on other sites More sharing options...
Freightrain Posted August 19, 2014 Share Posted August 19, 2014 Who makes those?I know Vintage air has one, but I was given a link to a place in Texas that has one a bit cheaper. Not quite as flashy looking box, but I don't need flashy. Link is at home, I'll get it posted.The big issue I have to deal with is getting the compressor mounted. I need to move my original filter off the front right side of engine(likely move it to frame mounted bracket) and then fab something and drive it off the waterpump. Have to mount pulley to outside of stock waterpump pulley.Checked into DCpowersales. One of the rooftop units was 330w, which equates to 27.5 amps at 12v. Wow, that will put a load on an alternator. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256583 Share on other sites More sharing options...
nasty51ford Posted August 19, 2014 Author Share Posted August 19, 2014 That's why I'm looking at the self contained unit, where you don't have to mount a compressor, drier and condenser, it's all in the unit, my B67T has that doghouse right there under the dash, so no under dash unit fitting, and I can't put one on the floor between the seats on the floor, because of the sleeper. Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256585 Share on other sites More sharing options...
nasty51ford Posted August 19, 2014 Author Share Posted August 19, 2014 Vehiclima is another good one For some reason, you can't copy and paste into this text box Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256587 Share on other sites More sharing options...
Freightrain Posted August 19, 2014 Share Posted August 19, 2014 Yup, the firewall is bad enough on a std B, I can imagine yours. Even with the smallest underdash, it will stick out about 6-7" past my dash. Livable since with the shifters there you can't do anything else with the space.I have a vintage revolving light on the roof so no room for that kind of unit(though I thought of them and considered it). Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256588 Share on other sites More sharing options...
nasty51ford Posted August 19, 2014 Author Share Posted August 19, 2014 Well, you could put it on the roof of the sleeper, just make sure it's big enough to cool the whole truck! Shouldn't take much. Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256631 Share on other sites More sharing options...
b61mack Posted August 19, 2014 Share Posted August 19, 2014 You still would need a compressor on the engine unless you use one from a motorhome then you would need a power source for 110 volt. Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256644 Share on other sites More sharing options...
nasty51ford Posted August 20, 2014 Author Share Posted August 20, 2014 Well no, actually there are units now that run on 12 and 24 volt systems, that's what this whole post was started about. Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256648 Share on other sites More sharing options...
MACKS Posted August 20, 2014 Share Posted August 20, 2014 They must draw some serious amps. Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256651 Share on other sites More sharing options...
nasty51ford Posted August 20, 2014 Author Share Posted August 20, 2014 Yeah, may want to make sure you have a "fat" altenator! Lol Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256654 Share on other sites More sharing options...
br549 Posted August 20, 2014 Share Posted August 20, 2014 We have one on a 70" sleeper for the sleeping system. It runs off of 4 12v batteries that charges up during the day and just runs on the batteries at nite When the batteries are new it will run for 8 hours in texas at nite and does a good job cooling the sleeper. works better and longer on up the east coast. As far as the unit goes, we put it on truck new in 2005 and one on another truck in 2009 and have done a good job and never had a problem with them other than battery replacements. Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256660 Share on other sites More sharing options...
nasty51ford Posted August 20, 2014 Author Share Posted August 20, 2014 What kind of truck do you have it on? Is it a big sleeper? I would be using it as my only source of A/C, but in a little B67, and a 36" sleeper, it should be fine I would think, I can close the sleeper off while I'm driving during the day Thanks Keith Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256668 Share on other sites More sharing options...
grayhair Posted August 20, 2014 Share Posted August 20, 2014 You might get a self-contained 24 volt roof mount unit, add two new 12 volt batteries and a new 24 volt alternator slave driven off wherever you can add a pulley. These babies draw quite bit of current so with this setup your a/c is completely independent from the rest of the trucks electrical system. Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256680 Share on other sites More sharing options...
br549 Posted August 21, 2014 Share Posted August 21, 2014 It is on a CXN Mack with the 70" high rise sleeper. We only use it to sleep in. The other one is on a 56" flat top sleeper it will last 10 -12 hours on the batteries on it. These are the older models system, I think the new models should do even better, but If you are going to have the truck running and charging the batteries I think it should do a good job. Running during the day we have a relay that charges the 4 additional batteries that run it when you shut the truck down. We run a 160 amp alt. We have not have a problem with them and they are used 4 nites a week in the spring thru fall. These Dometic are only 6000 or 7000 BTU units, I think the 13000BTU should do a great job, but you might have to put a higher amp alt. Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-256817 Share on other sites More sharing options...
nasty51ford Posted August 23, 2014 Author Share Posted August 23, 2014 Thanks, sounds like I will be installing a roof unit! Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-257055 Share on other sites More sharing options...
mrmack87 Posted September 3, 2014 Share Posted September 3, 2014 Does anyone know where they would sell a separate unit that is 12 or 24v? Any links? Quote Link to comment https://www.bigmacktrucks.com/topic/36741-roof-ac-unit/#findComment-258405 Share on other sites More sharing options...
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