| Author | Message | ||
| mark (Coolbus)
Registered Member Username: Coolbus Post Number: 63 Registered: 7-2006 Posted From: 71.54.203.149 Rating: N/A |
I am thinking about installing an air dryer on the bus. Can somebody tell me about the installation - never done it before. Is there a certain location where the dryer has to be plumbed in? Or can it go anywhere in the system? Thanks Mark | ||
| John Jewett (Jayjay)
Registered Member Username: Jayjay Post Number: 372 Registered: 1-2001 Posted From: 75.14.14.68 Rating: |
Try www.bendix.com. Their Site covers all of their models, installation instructions, etc. Info included would apply any brand. if you operate in cold country, pick a model with a heater built in. Stops the moisture removed from clogging the vent when it freezes. Cheers...JJ | ||
| Glenn Vining (Glennvin)
Registered Member Username: Glennvin Post Number: 22 Registered: 10-2002 Posted From: 75.90.8.68 Rating: |
Hi Mark, You gonna want to locate the dryer as far away from the compressor as possible. This usually means up around the front on a bus. This will give the air time to cool before it reaches the dryer. As John stated above, the Bendix site will help a lot. Workin' til He comes, Glenn | ||
| George M. Todd (George_mc6)
Registered Member Username: George_mc6 Post Number: 196 Registered: 8-2006 Posted From: 76.168.69.233 Rating: N/A |
Morning Mark, I too suggest you go to the Bendix site, they have been at it for a while, and know what they are doing. Download the portion of the handbook that lists models of air dryers, if you don't have hi-speed internet, and don't want to take the time to download a large file. Then, pay close attention to their schematic diagram, and do as they say, which is in contravention to the above post. They actually provide piping length requirements for cooling, according to air usage, but the dryer HAS to go between the compressor and the first reservoir, or it won't do much good. HTH, George | ||
| Paul Lawry (Dreamscape)
Registered Member Username: Dreamscape Post Number: 15 Registered: 5-2007 Posted From: 64.40.223.242 Rating: N/A |
Compressed air heats up thus creating moisture in the system. The closer the dryer to the compressor would be best. Less moisture equals fewer problems and rusting/gumming of parts. As stated before check the Bendix site before you do anything. | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 598 Registered: 10-2003 Posted From: 71.58.117.21 Rating: N/A |
Bendix recommends at least 6 feet away with a downhill slope to the line, preferably copper to dissipate the heat. My other 4905 has one up front by the end of the fuel tank on the driver's side. | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 377 Registered: 11-2005 Posted From: 63.97.117.18 Rating: N/A |
Glenn is right. Heating the air doesn't cause moisture, cooling it does. It is called condensing. | ||
| Ron Walker (Prevost82)
Registered Member Username: Prevost82 Post Number: 307 Registered: 11-2003 Posted From: 208.181.210.47 Rating: N/A |
Hi Mark .. on my Prevo it's mounted just behind the tag axle on the curb side. It's plumbed with a 6ft steel braided hose from the compressor on a down hill slope into the dryer. Then it goes into the wet tank which should be above the drive axle Ron (Message edited by prevost82 on June 17, 2007) | ||
| JR Lynch (Njt5047)
Registered Member Username: Njt5047 Post Number: 166 Registered: 7-2006 Posted From: 69.132.237.9 Rating: N/A |
FWIW, MC9s have the dryer mounted ahead of the front axle. That is a looong way from the compressor. However, it works well in this position. Purge valve sure is easy to hear! I check the air tanks occasionally and have never had any oil or water in any tank. I have a question about the dryer purge valve...does shop air application, if the pressure reaches the purge pressure (120 lbs in my bus) will the purge valve cycle? That would be bad if working in that area. I've spent a good deal of time under the front axle looking for leaks. Cheers, JR | ||
| Buswarrior (Buswarrior)
Registered Member Username: Buswarrior Post Number: 1028 Registered: 12-2000 Posted From: 70.53.131.78 Rating: N/A |
Hello. Heat is bad for the air dryer desicant. That is why there are minumum runs away from the air compressor, so you don't bake the desicant, rendering it ineffective. So, further away, the cooler the incoming charge, the better for the dryer. JR, yes, your shop air would be able to generate a purge cycle if the air system's pressure is cycling up and down. If the air pressure in the coach drops so that the governor cuts in, and then your shop air builds beyond the governor's cut-out, you will get a purge from the air dryer. The governor is a spring type device that does not care whether the engine is running. It reacts to the air pressure pushing, or not, on its internals. The air compressor governor is what controls the purge valve in the air dryer using a pneumatic signal line. In order to have a quiet visit under the front of the coach, a simple option is to lower your shop air pressure below your coach's cut-out pressure. happy coaching! buswarrior | ||
| JR Lynch (Njt5047)
Registered Member Username: Njt5047 Post Number: 168 Registered: 7-2006 Posted From: 69.132.237.9 Rating: N/A |
Thanks Buswarrior...I sorta thought that was a possibility, so the shop air is set to 100 lbs. 120 lbs is gov set point. I don't recall it purging on shop air, but the regulator has always been set at 100 lbs. I'm already blind in one eye...sorta like to keep the other! Worried more about overpressurizing the air system than thinking about the purge valve. Spent many an hour looking for leaks. That's a lost cause. Thanks, JR | ||
| John Harrelson (Jharl)
Registered Member Username: Jharl Post Number: 52 Registered: 7-2005 Posted From: 72.73.67.180 Rating: N/A |
Buswarrior you look cold | ||
| Buswarrior (Buswarrior)
Registered Member Username: Buswarrior Post Number: 1033 Registered: 12-2000 Posted From: 74.12.74.111 Rating: N/A |
Yup, makes the summer sun feel just a bit better with that frosted picture on there... beverage anyone? happy coaching! buswarrior |
