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add on high pressure switch
February 5, 2012
12:57 pm
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Steve Pooler
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Cor~

 

There is still something that does not feel right here, and I'm happy to send you the parts you request, but I'm not sure it's your issue, Or you might need the heavy duty switch...So could you please answer my questions as I ask them ?...Earlier you told me it was a phone plug....but thanks for confirming the HHH fault.

 

Is this in the Heat or Cool mode, or both ???...

Passport II should ignore the Hi PS switch in heat....But there is more to it than that.

Where do the Black & Orange wires terminate ??...Where do they go after leaving the plug ???

 

Do you have this manual for the Passport II ?....** you don't have permission to see this link **

 

Only trying to help here Cor  Wink  But I need all the info I ask to be as accurate as possible...Each question can point a differing way and save us both some effort (and Yes I'm here to help) A couple answers one way or the other can confirm what I need to know to get you the right answer...

Hate to say it, but if I could be on the boat...You would have had your answer in less than 30 mins...But since I can't be...Please don't add freon yet...200 psi is not uncommon this time of year...But then again I would need to know if running in heat or cool & air & water temps at that time too... Cool

 

Steve~

February 5, 2012
11:36 am
sabrejocky
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Hi Steve,

well I got to get a much better look at it yesterday and I was also able to get my hands on the diagram.

The plug I am talking about is actually not the phone style but a flat plug with 3 prongs. It has a black and a orange wire to it and according to the diagram it is the high pressure switch, if it also had the 3th wire than that would have been to the low pressure.

With the plug plugged in again the unit would run for a couple of minutes and than stop, displaying "HHH" reset itself after a while and do the same thing over and over again. All this time the high pressure never went over 200 psi, guess it is also in need of some more freon.

As the unit in such a thight spot it would be easiest to go with the service port setup, do you have them? Is it best I give you a call on this?

 

Cor

February 2, 2012
11:23 am
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Steve Pooler
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Still...What does the display show when it shuts down...???

 

Passport II units did not have the pressure switch wired to the board from the factory...It was wired in-line to the compressor & was High amperage.

The Passport II board did however have pressure switch connections...Just not as you describe as telephone plugs.

The pressure switch connection would be White and just to the left of the Display connector (which is a tele jack type)

There are two other Telephone jacks...One for a Alternate inside air temp sensor, and the other for Outside air temp, or a chilled water system loop sensor (Dual Purpose)

 

All this is what makes me wonder what you are jumping or unplugging...The system will run with the 2 temp sensors unplugged...There is a temp sensor in the Passport II that takes over if you unplug the Alternate...The Alternate was an option that was typically installed when the sensor in the Passport II (due to location) did not sense properly.

The Outside Temp was optional as well...

Important to know what the fault code was...You may be barking up the wrong tree  Wink

 

Steve~

February 1, 2012
11:24 am
sabrejocky
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Hi Steve,

was not able to get the pressures for you as I spend most the time I had fixing other problems, aren't boats fun!

I did get the right model # 

it is a VCP16K = passport II controls

Diagram M1010082

product # 205-210700

 

The rest of the info will have to wait a couple of days till I can get back down there.

 

Cor

January 31, 2012
9:19 am
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Steve Pooler
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sabrejocky said:

Good morning Steve,

sorry for the confusion. The VCM 12K unit has a passport add on box, however I am now talking about the 16000 btu unit. Not sure of the model, I will get that later today, but it looks like this one came from the factory with the passport controls as this one does not have the extra box.

The plug I am talking about is on the circuit board that is in the box on the unit itself. I will try get you the other info as I will go to the boat today.

 

Cor

Try to get a picture of the board...Or at least see if it looks like one in the PDF...I don't remember any with a telephone plug for the pressure switch...I'm wondering what it is you are unplugging...And I need to know the other answers too about heat or cool & pressures when it shuts off...Are they always the same ?

 

Steve~

January 31, 2012
8:34 am
sabrejocky
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Good morning Steve,

sorry for the confusion. The VCM 12K unit has a passport add on box, however I am now talking about the 16000 btu unit. Not sure of the model, I will get that later today, but it looks like this one came from the factory with the passport controls as this one does not have the extra box.

The plug I am talking about is on the circuit board that is in the box on the unit itself. I will try get you the other info as I will go to the boat today.

 

Cor

January 31, 2012
6:47 am
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Steve Pooler
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Ok Cor...Let's try to start over here as I am a bit confused & here's why:

  • Passport controls with the small penguin facing right were in production 1990-1996
  • You said your unit is a 1997 model "VCM"12K
  • If you look at that PDF again...It shows No "VCM" units on any page.
  • You also said that you unplug the telephone type plug from the board...
  • The only telephone type plugs on the Passport board board are for the Display, and an Air Temp Sensor.
  • Does your board look like the one in the PDF (page after the control) and if not...Which does it look like ?
I also need to know what the fault code is (what does it read) and when it happens...
  • Does it happen in cooling, heating, or both ?
  • What is the High pressure reading when it happens ?
  • Does it consistently shut off at that same pressure ?
I must admit I will be working from memory here as neither Marine Air, or Micro Air (Manufacturer of the Passport) provide a on-line version of the Passport manual...(They used to, but it's gone from both sites now)
That memory tells me that Passport units did not connect the pressure switch to the board...It was high amperage as described earlier & the Passport itself looked for a Compressor Load Fault...Then displayed either "CLF", "HHH" or maybe "---"
It could very well be that it is not the High Pressure switch that is doing the actual cut off, and that's why I need answers to all of the above...
Back in the days of your unit I was working for the Cruisair distributor, and yes we serviced Marine Airrr, but replaced the controls with Cruisair SMXII since that was what we handled (also felt it was a better control for the same money back then)
Steve~
January 30, 2012
6:10 pm
sabrejocky
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Tried link again and it worked this time.

It looks like I have the one on page 7, little penquin looking away from the writing.

 

Cor

January 30, 2012
6:02 pm
sabrejocky
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It will show fault and stay off. My control panel has the little pinquin on it, does that help? The link you posted is not working right now.

I have removed and plugged back in the connector many times and it still will do it.

 

Cor

January 30, 2012
12:11 pm
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Steve Pooler
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i'm not saying that the switch might not be bad but It could be your connections are dirty Cor...

The pressure switch is set to cut off at 425 psi...

One other question though...Does the unit restart by itself or does the control show a fault & leave the unit off ???

 

Passport does not tell me much...There was more than one version & they handle HI PS a bit differently.

You can identify your Passport model & board with this PDF:

/marine-ac-control-identification-marine-air-direct-expansion-units/

 

Steve~

January 30, 2012
11:27 am
sabrejocky
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I have put a jumper on the phone style connection on the circuit board and the unit runs just fine, if I plug the pressure switch back in it may run for a couple of minutes or not at all.

I have never seen the pressures go over 280 psi, it must be the switch.

 

Cor

January 30, 2012
11:17 am
sabrejocky
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Mine must be to low amperage one as it plugs in on the circuit board with a phone like plug, I have the passport controls.

 

Cor

January 30, 2012
10:30 am
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Steve Pooler
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Sorry about the weird text format in the post above...

This text editor seems to do funny things when you copy & paste from a PDF....But you get the idea  Wink

 

Steve~

January 30, 2012
10:27 am
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Steve Pooler
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Cor~

What pressure does it shut off at ?

 

Anyway here is the info straight from page 27 of the Marine Airrr price book (link at top of every page here)

Screw on Pressure Control Tee Assemblies to Wire to Circuit Board.
For Passport II and all Maxx Systems. (Does not require cutting into refrigeration circuit.)
297000014 $115.00 Tee Assembly High Pressure, low amperage
297000015 $135.00 Tee Assembly Low Pressure, low amperage
 
But...Your switch may be in-line to the compressor...Meaning it carries the full compressor load/voltage.
One kit (Above) is designed to connect to the circuit board pressure switch terminals and the switch Cannot handle load.
The other kit can carry the compressor load...(Below)
 
Screw on Pressure Control Tee Assemblies (Does not require cutting into refrigeration circuit.)
297000012 $115.00 Tee Assembly High Pressure, high amperage
297000013 $260.00 Tee Assembly Low Pressure, high amperage
 
The 297000014 (low amperage) kit is the better option in my opinion, but you would need to bypass the old switch (clip, strip & butt connect the wires) together)
Then run small wire into the circuit board from the new switch....
You need to first verify that your circuit board has pressure switch connections, and if this is a 3 Knob control you will need the High Amperage kit 
 
Steve~
January 30, 2012
9:49 am
sabrejocky
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My 16000 btu marine air unit has a high pressure switch that will shut down the unit even when the pressures are normal, I have confirmed this with the gauges hooked up.

The problem is that it is going to be a major pain to replace the switch as I will need to remove the water heater before i could even get to the a/c move it closer to the hatch so i could work on it.

Now here is my question I was told by Dometic that there is a kit that would allow you put a T on the HP service poort that than would accept the new switch. This I could do without all the extra work.

Is this a good solution and do you know what kit/part # I would need?

 

Thanks Cor