LMTV Air Conditioner AC Main Unit Gen1 and Gen2 Details

[bikeracer917]

Thanks for the reply... I think I found my problem. Pressure switches backward on the receiver dryer.

 

[Smike740]

If you are using a trinary switch, the blue leads are for the fan and the black are for the compressor clutch. The switch I used didn't come with any instructions but these seems to be the standard.

 

[bikeracer917]

No. No trinary. Just binary. I just screwed up and put the the switches in the wrong places. Simple fix. Hopefully that's the only issue with my ac install. Hoping it blows cold as a witches titty. Lol

 

[mkcoen]

Hoping it blows cold as a witches titty. Lol

It likely will at the vent. Unfortunately you'll be sitting about 3' from the vent and by the time it hits you it'll kind of coolish. At least that's the way mine is.

 

[bikeracer917]

Thanks for all the input guys. From what I know about the ac units the gen 2 is a higher btu than the gen 1. So i am pretty confident it will cool the cab pretty well. I have insulated the cab and modernized it as well. Seats. Carpet. Headliner. Etc. I'm hoping it's similar to a semi

 

[ramdough]

Anyone know the volume of the evaporators for gen1 and gen2?

Anyone know the volumes of the different condensers?

Thanks!


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[scottmandu]

Anyone know the volume of the evaporators for gen1 and gen2?
Anyone know the volumes of the different condensers?
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The LMTV condensers are all the same dimension.

 

[ramdough]

I spoke with an ac specialist today and we discussed matching volumes of different components.

There has been discussion in this thread about the stock condenser and two different MRAP condensers.

I am curious about the two evaporator volumes and the three condensers people are using.


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[ramdough]

Anyone have the full specs on these units? I have heard rumors of 26,000 BTU for the gen2 ac. Is that a real number? Anyone have the full specs?


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[ramdough]

What brake valve are you using with the gen2 ac units? I heard that it was necessary to upgrade to a different parking brake valve.


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[Smike740]

Here is the description of the valve I used.

Haldex Midland Manifold Valve 3064940 Parking Brake Trailer Air Supply Military

Should be available on the popular auction site for under $10.

Also here are the spec from the A/C unit drawing, the Gen 2 is the R-5760-0

 

[ramdough]

Here is the description of the valve I used.

Haldex Midland Manifold Valve 3064940 Parking Brake Trailer Air Supply Military

Should be available on the popular auction site for under $10.

Also here are the spec from the A/C unit drawing, the Gen 2 is the R-5760-0

Thanks,

Can you post or send their complete drawings or what you have? I have not found service manuals or for that matter, any documents. If you don't want to post it, send me a pm and we can do it through email if you like.

 

[SoreHorseman]

Fuses melt by current rating only. Voltage rating is based on suppressing the voltage arc that occurs after the fuse material melts. That is why 120 volt fuses are bigger than 12 volt fuses. The only issue with using a low voltage fuse in a high voltage situation is after the fuse metal melts, it may not open the arc and may destroy itself and any attached circuits. But the fuse will melt at the rated current.

 

[Mlvarnell]

Fuses melt by wattage. This heats and melts the fusible link because it cannot dissipate more than a certain amount of wattage. You are right about the rest...

 

[Mlvarnell]

Does anyone have the TM’s for the 2nd generation air conditioner unit? R-5760-0

 

[SoreHorseman]

"Fuses melt by wattage"; Yes that's true if the wattage you are talking about is the wattage delivered to the fuse. Joule heating, which is the mechanism behind destroying a fuse, can be expressed as follows:P = I[SUP]2[/SUP] * R. However when the manufacturer of a 2 Amp 250 VAC fuse talks about the fuse being a 500 Watt fuse, he's talking about the wattage delivered to the load, not the fuse. The fuse is rated at 2 amps. If the fuse is in a 250VAC circuit, the circuit will be delivering 500 Watts when it runs at a rated 250 VAC. If I stick that 250VAC fuse in a 12VDC vehicle circuit, the fuse will only deliver 2 amps to the load; The power delivered to the load is 2 amps x 12 Volts = 24 Watts, not 500 Watts.

 

[FMTV Truck Sales]

Does anyone have the TM’s for the 2nd generation air conditioner unit? R-5760-0

What are you looking for?

 

[Mlvarnell]

Exploded view + electrical diagrams...

 

[Mlvarnell]

Exactly right!

 

[Smike740]

View attachment rd-3-12500REVS.pdfView attachment rd-6-5678rev-.pdfHere is a couple of drawings I found in an AC thread that was posted a few years ago. Hopefully these help out. The first one is the drawing with Red Dot part numbers and has 4 pages, the second is the circuit diagram.