You must be logged in to post Login Register


Register? | Lost Your Password?

Search Forums:


 






Minimum search word length is 3 characters – Maximum search word length is 84 characters
Wildcard Usage:
*  matches any number of characters    %  matches exactly one character


Forum
Marine-AC Topics
Troubleshooting
add on high pressure switch

add on high pressure switch
Print this Topic
Page:   1   2
Post
Member

sabrejocky

posts 14

9:49 am January 30, 2012
Print this Post
1
0

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
Admin

Steve Pooler

posts 1127

10:27 am January 30, 2012
Print this Post
2
0

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~
Admin

Steve Pooler

posts 1127

10:30 am January 30, 2012
Print this Post
3
0

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~
Member

sabrejocky

posts 14

11:17 am January 30, 2012
Print this Post
4
0

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
Member

sabrejocky

posts 14

11:27 am January 30, 2012
Print this Post
5
0

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
Admin

Steve Pooler

posts 1127

12:11 pm January 30, 2012
Print this Post
6
0

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:

http://marine-ac.com/marine-ac…..ion-units/

 

Steve~
Member

sabrejocky

posts 14

6:02 pm January 30, 2012
Print this Post
7
0

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
Member

sabrejocky

posts 14

6:10 pm January 30, 2012
Print this Post
8
0

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
Admin

Steve Pooler

posts 1127

6:47 am January 31, 2012
Print this Post
9
0

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~
Member

sabrejocky

posts 14

8:34 am January 31, 2012
Print this Post
10
0

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
Page:   1   2
Topic RSS

About the marine-ac.com Forum

Forum Timezone: America/New_York

Most Users Ever Online: 29

Currently Online:
8 Guests

Currently Browsing this Topic:
1 Guest

Forum Stats:

Groups: 5
Forums: 11
Topics: 398
Posts: 2369

Membership:

There are 334 Members
There have been 143 Guests

There are 2 Admins
There is 1 Moderator

Top Posters:

GeorgeH – 47
Angela – 45
z28jimi – 25
MexicoMike – 21
reefgeorge – 21
ThirdHatt – 18
davidwigler – 17
Mr. Dee – 17
biohazard – 17
mixman – 16
Ultimate Indulgence – 15
sabrejocky – 14

Recent New Members: becsvet, adjustrite, blackwatch30, DWB, Raymond, pbrads1021, sizematters, cgeist, TMorse, Iproff, Ernie Jones, Holsum69

Administrators: Steve Pooler (1127 Posts), Scott Pooler (13 Posts)

Moderators: Steve Pooler (1127 Posts)



 
Bookmark and Share