| Author | Message | ||
| Jesse Williams (Buffalo_76)
Registered Member Username: Buffalo_76 Post Number: 7 Registered: 8-2006 Posted From: 205.175.225.5 Rating: N/A |
The person that did the conversion installed a Duo-Therm basement A/C in the rear-most baggage compt. The airflow in the rear of the bus is great but in the front it leaves much to desire. I'm not sure it's ducted correctly as there is 6 inch (I think) ducting all the way from the unit to the front. Shouldn't it start with a larger diameter and neck down as it goes forward? Would it help if I installed a couple of inline duct fans along the run? There is also a Duo-Therm roof A/C just fwd of the mid point of the coach. I assume this was done because of the flow problem. I want to keep the roof unit and still improve the basement unit air flow. Any suggestions? JW | ||
| Bob greenwood (Bob_greenwood)
Registered Member Username: Bob_greenwood Post Number: 77 Registered: 7-2006 Posted From: 65.150.44.112 Rating: |
pushing cold air up takes more horsepower,'specialy if it's for long distances | ||
| John MC9 (John_mc9)
Registered Member Username: John_mc9 Post Number: 59 Registered: 7-2006 Posted From: 69.82.158.243 Rating: |
Re: "Would it help if I installed a couple of inline duct fans along the run?" It might help. It'd be well worth a try! I'd shut down the rear vents, if possible. Anything that'd help the air to get pushed forward, would be a plus! | ||
| Jack Conrad (Jackconrad)
Registered Member Username: Jackconrad Post Number: 472 Registered: 12-2000 Posted From: 207.30.189.43 Rating: |
Our RVP (formerly Coleman) basement air specs the supply duct at 48 sq. in.. We made our duct 3" tall by 16" wide and it runs almost the full length of the bus in the ceiling. We get good air distribution in all areas. We do run 2 small fans mounted above the windshield to throw the cool air back onto us when driving | ||
| Marc Bourget Unregistered guest Posted From: 64.142.42.176 Rating: |
The 6 x 24(??) duct, depending on the output of the duo-therm, won't be a problem as much as the lack of insulation of the duct on the way forward. The duct should be smooth. It would conduct air better than a 12" flexible ducting. I'm sure there's a resource on the BB or on the 'net that will help you match your output with a duct size. | ||
| Greg Peterson (Gpmci102)
Registered Member Username: Gpmci102 Post Number: 13 Registered: 8-2006 Posted From: 71.228.18.37 Rating: N/A |
I had a room in my house that never got enough air. I put one of those cheap fans that you get at Home D and it only lasted 2 years and the bears froze up. It did not blow that much air either. I replaced it with a Fantech FX 6xL that will put out 392 CFM and it will do it with high backpressure. No more problems. Take a look at this site. http://www.hvacquick.com/frfnconfig.php?fm=fx If you go back a page they also have fans with plastic housings and different CFM ratings. These things are actually blowers with real bearings and are amazing almost like a small version of the furnace blower. Don’t waste your money on the propeller fans at the Home improvement stores. All you have to do is cut your duct and mount this blower and connect it to 120VAC and you will be done. I put mine on a thermostat in the room it feeds and wired it back to the blower control of my furnace, it kicks on when needed automatically. This thing was way cheaper than tearing up my house and trying to increase the duct sizes. | ||
| C. Ray Powell (Raypowell)
Registered Member Username: Raypowell Post Number: 84 Registered: 3-2001 Posted From: 66.174.79.233 Rating: N/A |
I suggest choking down the rear outlets, even if it means installing new vents that could be regulated. Here how I did mine. Ran 4"X14" duct up to attic area then ran 6 runs of 4" duct to outlets. C Ray | ||
| Bob greenwood (Bob_greenwood)
Registered Member Username: Bob_greenwood Post Number: 82 Registered: 7-2006 Posted From: 63.233.7.154 Rating: N/A |
I 'understand' you have a 6" round duct going forward ?..yes on the inline fan,put it about halfway in the run, | ||
| Bob greenwood (Bob_greenwood)
Registered Member Username: Bob_greenwood Post Number: 83 Registered: 7-2006 Posted From: 63.233.7.154 Rating: N/A |
don't choke down the rear vents,you have to move x amount of air or the unit will freeze-up | ||
| John Jewett (Jayjay)
Registered Member Username: Jayjay Post Number: 361 Registered: 1-2001 Posted From: 64.136.49.226 Rating: N/A |
The Duotherm fan is 650 CFM and should do the job without auxilliary help. You suppy plenum is far too small, and you need a return that is three times the area of the supply. You may have nothing more than grills in the floor for the return, and if so then you should not have a supply opening nearby, since it will recirculate too quickly, and not cool the front of the bus. Get on their website for more installation tips. When you get it corretly plumbed it is a truly wonderful, quiet, efficient system. (and your roof will never leak with one!) Cheers...JJ | ||
| Nick Badame Refrigeration Co. (Dnick85)
Registered Member Username: Dnick85 Post Number: 37 Registered: 2-2006 Posted From: 66.174.93.98 Rating: N/A |
Hello, I have installed 2 Duo- HP, stacked 15,000btu's in the center bay. Piped with 2 6" oval supply's to my 3"x14" main trunk in my ceiling. they are stagged for hi and low cooling/Heat.With 1300cfm of air power there is never a problem getting air to the front. The return is piped to the coach air returns and works very well. Very quiet, air flo is supurb, and no hot spots. Nick- |
