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Old 08-04-2011, 08:44 AM   #1
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115v AC marine a/c help with wiring diagram


i have a/c on my boat but the compressor wont run. The charge is good, im thinking either the a/c compressor is bad, something with the capacitor, or in the circuit board. Anyways its a 115v ac system.
The purple wire going into the compressor from the circuit board has 115v, there is 115v on the orange wire coming from pin S (compressor), pin c 115v (compressor), pin R 1.2v (compressor). There is also 1.2v on the white wire coming from the capacitor which has 115v going into it.
Alright NOW with the white wire removed from pin R at the compressor the compressor shows 115v on that pin. With both white wires removed from the circuit board at the compressor run it shows a output of .5v
Im very new to 115v AC current compaired to 12v DC. If you need more info ill try to fill you in. But this is what i got from testing last night. Below is a wiring diagram

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Old 08-04-2011, 09:00 AM   #2
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115v AC marine a/c help with wiring diagram


Where is your second lead when measuring the voltages? It should be on neutral not ground. There could be an open neutral issue.

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Old 08-04-2011, 09:06 AM   #3
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115v AC marine a/c help with wiring diagram


its on the green ground wire.
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Old 08-04-2011, 09:10 AM   #4
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115v AC marine a/c help with wiring diagram


Sounds like you are using a ground point for one of you meter leads. When you measure voltage to the motor you measure from white to purple. If you have 115V between these two points then to me it looks like the compressor is bad. The capacitor is labeled as a run capacitor so the compressor should be trying to start. You don't hear of feel a hum from the compressor?
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Old 08-04-2011, 09:18 AM   #5
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115v AC marine a/c help with wiring diagram


I dont really hear a hum, just the water pump running and the compressor gets warm/hot to touch after 5min-10min
i also didnt check between the purple and white wire. i went to the green ground and purple, green ground and white. I really dont know AC current that well like i know AC current

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Old 08-04-2011, 09:26 AM   #6
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115v AC marine a/c help with wiring diagram


You could try a new capacitor.
You said the charge is good. Do you have a gauge set for AC?
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Old 08-04-2011, 09:42 AM   #7
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no gauge set, there is a warning that is set with low pressure. also does it sound like a capacitor? i much rather spend the 17$ over the $500-$600
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Old 08-04-2011, 09:51 AM   #8
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115v AC marine a/c help with wiring diagram


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no gauge set, there is a warning that is set with low pressure. also does it sound like a capacitor? i much rather spend the 17$ over the $500-$600
Hard to say.
If the motor is getting hot that tells you it is getting power.
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Old 08-04-2011, 02:07 PM   #9
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115v AC marine a/c help with wiring diagram


There is no way can know if the charge is good unless the compressor running. Then you can put gauges on it see the pressures.

Hot compressor tells me it is getting voltage. Cap is a cheap test to see if it will start.
Drawing looks fishy to me. The terminals on the compresor are marked c ,s & r, which to me is comon, start, & run, yet the capacitor is labelled as run cap and connected to what I consider the start terminal. I tjhink it is actually a start cap as I also connections for start assit option across it.
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Old 08-04-2011, 09:40 PM   #10
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115v AC marine a/c help with wiring diagram


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There is no way can know if the charge is good unless the compressor running. Then you can put gauges on it see the pressures.

Hot compressor tells me it is getting voltage. Cap is a cheap test to see if it will start.
Drawing looks fishy to me. The terminals on the compresor are marked c ,s & r, which to me is comon, start, & run, yet the capacitor is labelled as run cap and connected to what I consider the start terminal. I tjhink it is actually a start cap as I also connections for start assit option across it.
I agree. You should try a new cap and assist cap
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Old 08-05-2011, 03:25 PM   #11
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115v AC marine a/c help with wiring diagram


the start assist kit gets smoking hot too, i dont know if that means anything or not but the run capacitor doesnt get warm or anything.
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Old 08-05-2011, 05:28 PM   #12
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Did you try a jumper wire across the LPCO switch just to see if it starts? If it starts you need to find the freon leak and fix it.
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Old 08-05-2011, 05:32 PM   #13
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Did you try a jumper wire across the LPCO switch just to see if it starts? If it starts you need to find the freon leak and fix it.
Why would fixing a freon leak be necessary at this point? The compressor motor is getting hot along with the start assist so there is power to the compressor. If the LPCO was open there wouldn't be power to the compressor.
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Old 08-06-2011, 06:57 AM   #14
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115v AC marine a/c help with wiring diagram


Mis read though compresssor was not on. Your post started out with my compreesor won't run. Good Luck.
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Old 08-06-2011, 12:43 PM   #15
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115v AC marine a/c help with wiring diagram


Using ground as reference when reading voltages is not a good or sound practice. Ground is for unwanted currents. What if the control panel was not grounded properly? Always read across the actual circuit wires. In this case the white neutral to any other terminal. I am glad Joed brought this up. Many electricians do this too. I guess they just do not know any better. Or they are not good at what they do.

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