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Bill Holstein (Billmoocow)
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Username: Billmoocow

Post Number: 36
Registered: 5-2009
Posted From: 98.232.207.25

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Posted on Monday, November 09, 2009 - 11:58 pm:   

Does anyone know of anywhere someone can get a descent schematic of a mc8 duct system? I want to see if i can modify air, heat introduction besides original equipment. Is it possible to put a heat pump or air to original duct system?
John MC9 (John_mc9)
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Username: John_mc9

Post Number: 1014
Registered: 7-2006
Posted From: 74.162.83.126


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Posted on Tuesday, November 10, 2009 - 8:24 am:   

If you saw what's inside those ducts, you wouldn't want to ride in it.

That aside, the ducts aren't insulated, since the OE system had
enough power to cool the bus with the door and windows open.

Without insulation, your puny little AC unit would be working
it's evaporator off, just trying to cool the ductwork.

I suppose you could route insulated duct through the existing
ducts if you tried hard enough, but it'd be easier to go overhead
with it.

I had planned on routing the Welch Auxiliary air system into
overhead ducts along the edge of the ceiling.

Since cold air drops and hot air rises, circulation would be easier
on the unit and more effective overall.

You might want to consider that?

Good luck!
Bill Holstein (Billmoocow)
Registered Member
Username: Billmoocow

Post Number: 37
Registered: 5-2009
Posted From: 98.232.207.25

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Posted on Tuesday, November 10, 2009 - 10:35 pm:   

That makes a lot of sense about the oem. It was just an idea but i thought i would throw out there for sugestions anyway.
John MC9 (John_mc9)
Registered Member
Username: John_mc9

Post Number: 1015
Registered: 7-2006
Posted From: 74.235.211.18


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Posted on Wednesday, November 11, 2009 - 8:30 am:   

I don't know why no-one else answered, we used to
have tons of input regarding this stuff.

Maybe they're all on "buttbook" now instead of here?
marvin pack (Gomer)
Registered Member
Username: Gomer

Post Number: 660
Registered: 3-2007
Posted From: 71.53.155.14


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Posted on Wednesday, November 11, 2009 - 9:17 am:   

If I am not mistaken,which I usually am, I believe the oem 's are rated at about 15 tons of ac. So It won't work to just hook in the existing ducting and there is about zero insulation in the floor ducting. I have 2 18,000 Cruise-air in an 4104 and it does a pretty good job,except the drivers area which is remedied with a couple of 12 v fans pointed right at ME.

Gomer
Bill Holstein (Billmoocow)
Registered Member
Username: Billmoocow

Post Number: 38
Registered: 5-2009
Posted From: 98.232.207.25

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Posted on Wednesday, November 11, 2009 - 10:40 pm:   

That was a good one John! Kinda crossed my mind as well.LOL. But back to the subject of the ducts, what a waste of ducting. One would think a person would be able to put a heavy duty air/heat system in bay that woud keep up with the downsides of the ductwork. Maybe a house system of some sorts?
John MC9 (John_mc9)
Registered Member
Username: John_mc9

Post Number: 1016
Registered: 7-2006
Posted From: 74.235.211.18


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Posted on Thursday, November 12, 2009 - 12:06 am:   

My bus is gone now, and I never had the chance to finish it,
but as far as the AC unit.... I decided that roof airs were the least
expensive to buy, easiest to install, and would put the air into the
bus where I wanted it.

I ran one while working on the bus down here in Florida during
the summer, and it was fine for me. With both going, it was
more than cool enough. But I had three windows on each side
sealed and insulated with 2" foam, and a reflective shield in
the windshield area.

Driving down the road, even with the OE unit in use, with a fully
loaded passenger bus, fans were needed when the sun was beating
down into the windshield.

Like Gomer said, you'd need fans up front.....

You could make some modification to the driver's air that exists,
and there's a few guys here that can tell you how they did it.

I think it was Niles, that had a refrigerator compressor running
the driver's air... It sounded like the way to go.

That Welch aux system I gave you a link to, can also be used to
supply the driver's air assy with refrigerant. Guys ran tubing inside
the existing piping from the old OE unit in the rear, to the driver's
AC stuff in the front. The Welch system seemed to do well running
both rear and front. The engineer at Welch had some names of those
that did it.

There's a lot of ways to spend the cash..... Like Fred says:
Do it your way!
R.C.Bishop (Chuckllb)
Registered Member
Username: Chuckllb

Post Number: 966
Registered: 7-2006
Posted From: 75.210.7.85

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Posted on Thursday, November 12, 2009 - 10:50 pm:   

JTNG....contact me via private email...I want to check on U! :-)

Regards..

RCB

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