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Thread: LMTV Air Conditioner AC Main Unit Gen1 and Gen2 Details

  1. #31
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    You will need condenser and dryer. And hoses and v-belt. Refrigerant. Pressure switches. And Time and money. Lol

  2. #32
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    Thanks... Now have to figure out what to do. Would it be stupid to put camper roof top and try to use inverter. coleman has one 1225 - 1450 watt. Wonder if electrical system could keep up a 2,000 watt inverter...
    Last edited by KEN2; 03-13-2017 at 18:47.

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  4. #33
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    I have learned from experience that there is only one way to do things.... And that's the right/correct way. Lol. There are modifications that can be done and alot of guys on this site have done them. But do whatever you need to to be cool. Lol.

  5. #34
    4 Star General mkcoen's Avatar
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    I have the correct set up using all the correct parts and its less than overwhelming. It will cool the cab down to a point but you've got a lot of area absorbing heat, including whats coming off the engine, and the units are not putting out enough cold air to fully overcome that. You're going to need a bigger unit and a whole lot of insulation to get "car quality" AC.
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  6. #35
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    I have totally modernized my cab. 3 layers of insulation. It has really quieted down the cab and really insulated it. Really needed here in Florida.

  7. #36
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    Quote Originally Posted by mkcoen View Post
    I have the correct set up using all the correct parts and its less than overwhelming. It will cool the cab down to a point but you've got a lot of area absorbing heat, including whats coming off the engine, and the units are not putting out enough cold air to fully overcome that. You're going to need a bigger unit and a whole lot of insulation to get "car quality" AC.
    That is to be expected, you have a windshield the size of USS Nimitz that lets in solar heat and the cab sits on a 230hp diesel fired heater (engine).
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  9. #37
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    Hey mkcoen. Can you help with a few questions about my gen 2 sysyem? Charged the system but condenser fans and compressor not cycling.

  10. #38
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    Quote Originally Posted by bikeracer917 View Post
    Hey mkcoen. Can you help with a few questions about my gen 2 sysyem? Charged the system but condenser fans and compressor not cycling.
    Mine is a gen 1 unit so not sure if there is a difference. We wired the condenser fans to run full time when the unit was on. Not sure why your compressor isn't cycling on though.
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  11. #39
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    I have Gen2 and it's operating fine, I guessing you have a wiring issue. Did you use a binary or trianary pressure switch and how did you wire up the compressor and fan?

    Here is how the wiring should be connected

    Gen 2 Evaporator

    Single pin connector --> connect directly to ground if you want the condenser fan to run continuously or connect thru a trianry pressure switch and the fan will only run when the system pressure is above the switch point (around 230 psi if I remember correctly?)

    Two pin connector --> 24V positive and ground either use a 20A inline fuse or a 15A breaker (a 15A fuse will blow since the motor starting current is much higher than the running current)

    4 pin connector

    Purple --> Condenser fan power
    Black --> Condenser fan ground
    Green --> Compressor clutch power
    Yellow --> Bianary or trianry pressure switch ( the other wire on the pressure switch is grounded)

    The remaining connector on the evap unit plugs into the connector that was used on the heater that was removed.

    Hopefully this make sense
    Last edited by Smike740; 05-21-2017 at 20:14. Reason: added info

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  13. #40
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    Thanks for the reply... I think I found my problem. Pressure switches backward on the receiver dryer.

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