Dash Air pressure switch on 2001 Dynasty

[jlshand]

Wondering if someone with a similar year and model can tell me specifically where the trinary ( or maybe its a binary) switch for this models dash air is located? I believe it is either right on the compressor (engine rear) or close to the drier and condenser which are much harder and so far unable for me to reach.
The compressor has a couple of connectors covered by small plastic caps which look like those sold on the Evans Tempcon website. But.... what they seem to be covering does not look like the pictures I've seen of the trinary/ or binary switch.

My air worked fine after a charge but now wont recharge. I've read that these switches are often bad and often overlooked so a new compressor can be sold ( cynical me!)

I know I have to check out the obvious, the compressor itself, but I would just like to locate this switch at the moment

I also have been told that two seemingly identical rigs can come off the production line with "parts" in differing locations

Thanks to any and all suggestions

2001 Monaco Dynasty with 370 Cummins

[drnitrous]

I'm not exactly sure what you mean by binary, but if you are looking for the low pressure transducer that needs to be jumped to engage the compressor clutch, it is located in front on my 02 Dynasty. You have to slide out the generator and it is on a hose fitting, was half wrapped in foam on mine. Its about eye level right under the upper overhang in the middle. Its a standard Hobbs type switch, two wires you can disconnect and clamp together which will engage the clutch so you can add freon. Perhaps you are speaking of something else I'm not familiar with, good luck.
Brent

[jlshand]

Brent,

Thanks for taking the time to respond.

I'm not sure either if we are talking about the same switch. The binary/trinary switch is the one used to cutoff the compressor if the refrigerant is too low or two high (if its binary) or a third function which I have forgotten, if its a trinary switch. Evidently the Evans Tempcon manufacturer went back to a binary switch some time around when my rig was assembled. The purpose for either is to protect the compressor when the refrigerant is too high or low.

On the evans Tempcon website the switch is listed as RV212188 if trinary and RV 212069 if binary. The chassis maker (Monaco) decides where the switch is located

I'm thinking the switch you refer to is something else but if you know the one you refer to functions to cut the compressor as described above we are probably talking about the same thing.

I would like to know if you feel we are talking same switch

Thanks

[walt2137]

Quote:

Originally Posted by drnitrous I'm not exactly sure what you mean by binary, but if you are looking for the low pressure transducer that needs to be jumped to engage the compressor clutch, it is located in front on my 02 Dynasty. You have to slide out the generator and it is on a hose fitting, was half wrapped in foam on mine. Its about eye level right under the upper overhang in the middle. Its a standard Hobbs type switch, two wires you can disconnect and clamp together which will engage the clutch so you can add freon. Perhaps you are speaking of something else I'm not familiar with, good luck. Brent

What Bret is talking about is a preset thermostat and its on the passenger side of the firewall in the gen compartment and has two wires like Bret said and a temp probe into your AC box (go to Ebay # 120712249567 to see what we are talking about) I just replaced the one on my coach, what it is does is if the AC starts to freeze up it will cut the compressor off. Its not unusual for this part to fail.
To test just hook both wires together as Bret has said.

[lonestarace]

I think Brent has it right.

Its a low pressure switch in the gen area near the dryer w/two wires goin to it.

I find that the switch usually doesn't need jumping after the first can of freon is open and starts pressuring up the system. But if it does, it is easy to make a short jumper wire w/male ends.

We hope this helps

[Rex]

If it is a binary pressure switch, or you think it is, take a look at eBay item number 310312071793 and you can see what one looks like.

[drnitrous]

JL,
Attached is a photo of the low pressure spade end dual pole switch I am talking about. It senses the low pressure side and if you are indeed fairly low on freon it will not allow the ac clutch to engage. You can jump it by removing the two wires and putting a jumper cable made from two spades and a piece of wire in place of the sensor thus closing the circuit. Mine is invariably the low pressure cutoff that won't allow it to engage. Once its engaged you can check your pressures and go from there. Thanks to everyone for their input as well. I am going to try to attach a photo of the switch for you, hope I'm successful, haven't tried that before.
Good luck!
Brent

[RinkersRanch]

I've seen these switches before, but I've only seen the terms Binary/Trinary on the engineering drawings. The service side calls them low/high pressure switches. The Binary switch is a low pressure switch located somewhere on the low pressure line. The Trinary switch is a high/low pressure located somewhere on the high pressure line. Both these switches will interrupt the power to the compressor. With a compressor at the rear and the evaporator in the front these switches could be anywhere. Most service manuals i have seen are little help in locating these type switches. I'm sorry but I'm no help locating the switches, I just thought I could help a little with the terminology.