| Author |
Message |
JackW
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 10, 2005 - 11:33 am: | |
Hello,
Does anyone know the approximate BTU ratings for MCI8-9 driver's heat and air? Looking at replacing with a dual fan coil unit, with compressor/ condensor up front. Per Sean's thread on his install, and some measuring, I can tell you the unit he used, Red Dot R-8500 (22k heat, 15.2k cool) would fit very nicely without having to mess with the factory fiberglass plenum. It would also free up the entire righthand section (evaporator) for storage etc. Another Red Dot model, the R-9590 (31.6k heat, 33k cool) would fit nicely as well, and has larger capacity.
The A/C-heat will have to be sized large enough to keep the front cool/warm on the road.
I have a 1975 MC8 (coach heat-A/C removed) with two 15k Btu roof airs, and a Webasto heater.
TIA, Jack |
Sean Welsh (Sean)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 10, 2005 - 12:21 pm: | |
Jack,
Just as a data point, our "cockpit" is a fairly tightly enclosed space. The back wall is right behind my seat, the ceiling is 4' high, and it's the width of the coach. That makes it less than 200 cubic feet of volume, for which the R8500 (so far) has been plenty, even with the huge expanse of glass.
Since the volume in the MCI is "open ended," I think you'd be happier with a larger-capacity unit. The R8500 is intended for truck cab type applications such as armored cars.
If you can fit the 9590, I'd go with it. You'll also need bigger condensers than we used as well, but I think the compressor might still be up to the task. I don't have the ratings handy, but I found the specs on the internet in the past.
-Sean |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 10, 2005 - 12:32 pm: | |
I think the first item will do fine...12,000 BTU =one ton.(A/C)for front of bus..& I am useing 35,000 heat...to heat the WHOLE bus |
JackW
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 10, 2005 - 12:43 pm: | |
Thank's for the reply Sean,
Yes, your driver's area is a different situation altogether.
Could I ask what the R-8500 cost you?
I'm a commercial refrigeration/HVAC contractor, so once I can determine what the OEM capacity was, I can go from there.
It certainly not going to be the same with the coach heat-a/c gone, but would like to have somewhere close to OEM capacity up front.
I'm looking at the rooftop condensors Red Dot has as well.
Jack |
JackW
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 10, 2005 - 12:54 pm: | |
Hey TWODOGS,
Yep, one ton per 12k btu's.
I'm going to measure the evaporator and heat exchanger today, and do some calcs. That will answer some questions, but not all. Still need to know refrigerant cfm, and air cfm.
I have 48k btu of heat, and it's still cold up front when under 20F. Need to reconfigure some piping, it was that way when I bought it.
Thanks for your response,
jACK |
Sean Welsh (Sean)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 10, 2005 - 12:57 pm: | |
Jack,
I don't have the details handy, but I can try to look them up if you really need them.
I think the R8500 was also somewhere between $400-$500. On top of that, though, we had to buy the 4x3" duct adapter, and we also added a 3-knob dash control ("temperature"--really just the heater valve control, off-heat-ac, and 3 fan speeds) which replaces the two toggle switches that come standard with the R8500. Plus the heater valve. And I had to add a relay to make the fancy 3-speed fan switch work right.
When you add the condenser, condenser fan, and trinary pressure switch, we were into Red Dot for over a grand, I'm pretty sure.
-Sean |
JackW
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 10, 2005 - 1:16 pm: | |
Thanks Sean,
I read your post yesterday, and was interested to know how much of the ~2000. was to Red Dot.
$400-$500. isn't that bad for the fan coil unit.
(Now, where did I put those contact numbers for Thermo King?) :-) |
James Maxwell (Jmaxwell)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 10, 2005 - 2:00 pm: | |
Are we talking hermetic compressor or mechanical driven from engine? 33k elec. hermetic would be almost prohibitive from a power supply standpoint. I would think that a 15k cooling unit would be more than adequate to keep you comfy with the directed air discharge of dash diffusers. IMHO, a rooftop condenser appears somewhat like a delivery truck or an older Bluebird. I would opt for a Cruise-aire 15k unit. |
JackW
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 10, 2005 - 3:24 pm: | |
Hi James,
Yes, a hermetic compressor, or a auto type compressor driven by either elec motor, or hydraulic.
I appreciate the input on 15k.
Low profile condensor, wouldn't even see it.
Thanks,
Jack |
Jim Bob
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 10, 2005 - 3:53 pm: | |
Not sure about your bus, but the Eagle dash unit is 24,000 BTUs. The main air is two 60,000 BTU evaporators for a total of 12 tons.
Jim-Bob |
gillig-dan
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 10, 2005 - 4:05 pm: | |
Jim Bob,
Just wondering... do those ice cubes hurt when they come flying out of the dash???
Gillig-Dan |
JackW
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 10, 2005 - 4:16 pm: | |
Thank's Jim Bob,
That's certainly a baseline I can work off of.
You don't happen to know the capacity for heat, do you? |
Jim Bob
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 11, 2005 - 9:56 am: | |
Gillig-dan, the ice comes out shaved. You hear a rattling in the dash, then it comes flying out. Kinda like the spray from hitting a wave in the boat.
Refreshing!
Jack, I do not know the heat capacity. (Not something I worry about too much in S. Florida.) |
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