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1990 3807 heat/air issue

Discussion of AC's, plumbing and sanitation related issues.
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Topic author Canada
Washopay
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Vessel Info: 1990 3807 Aft twin 7.4 Mercruisers
1984 3207 twin 270 Crusdaers
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1990 3807 heat/air issue

Postby Washopay » May 1st, 2016, 9:42 pm

Anybody know the make of the heat/air units in 1990 3807s? Or where I can get a manual to do some troubleshooting?


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tomschauer
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Re: 1990 3807 heat/air issue

Postby tomschauer » May 1st, 2016, 11:26 pm

I don't know what manufacturer Carver used in 1990, others on this forum may. But if you are not the original owner, there is a good chance the unit(s) may have been replaced somewhere along the line. There should be a make / model number somewhere on the unit, normally on the control box. If not you may want to make sure the power is off and remove the control box cover. The make / model and wiring diagram should be on the back side of the cover.
A couple things to look for...
When you turn the stat on do you have water flow from the pump through the unit and discharging from the boat? If not you need to start here.
If you have water flow, does the compressor try to start? If not look for the high pressure switch. the older units had a manual reset switch, usually a red button on one of the copper lines near the discharge of the compressor. Some also had a low pressure switch, normally a blue button on the larger copper line near the compressor.

If the high pressure was tripped, you most likely ran the unit without water flow. If the low pressure tripped, you most likely need to clean the filter if it has one and the evaporator coil.


Give some more info and I am sure help can be provided.

Tom
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Topic author Canada
Washopay
Deck Hand
Deck Hand
Posts: 52
Joined: September 29th, 2014, 9:47 pm
Vessel Info: 1990 3807 Aft twin 7.4 Mercruisers
1984 3207 twin 270 Crusdaers
Location: Barrie, ON
Has thanked: 23 times
Been thanked: 5 times

Re: 1990 3807 heat/air issue

Postby Washopay » May 2nd, 2016, 6:31 am

Hi Tom. Thanks for the guidance. You've given me a great place to start and I'll let you know how I make out
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Topic author Canada
Washopay
Deck Hand
Deck Hand
Posts: 52
Joined: September 29th, 2014, 9:47 pm
Vessel Info: 1990 3807 Aft twin 7.4 Mercruisers
1984 3207 twin 270 Crusdaers
Location: Barrie, ON
Has thanked: 23 times
Been thanked: 5 times

Re: 1990 3807 heat/air issue

Postby Washopay » May 2nd, 2016, 10:30 pm

Hey Tom. It's a Marine Airrrrrr. The pump runs and discharges. The compressor kicks in. I could see no evidence of low pressure or reset switches.
image.jpeg
. This is the model. Any ideas on how to proceed? Pressure test, drain and refill? Thanks!
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tomschauer
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Vessel Info: 1998 Carver 355
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1990 Proline 17CC
2018 Regal 1900ESX
Location: upper chesapeake bay
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Re: 1990 3807 heat/air issue

Postby tomschauer » May 3rd, 2016, 8:59 pm

Ok, I assume the fan runs? And if the compressor runs, does it continue to run? If so, in the ac mode you should get a temp drop between the ambient air and the discharge air from the unit. This should be at least 10 degrees after it has been running for 10 minutes or so. If the temp drop is much higher and the coil starts to frost, it is most likely a dirty coil. If you have little or no temp drop you most likely lost refrigerant.

Let me know.
Thanks
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Topic author Canada
Washopay
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Posts: 52
Joined: September 29th, 2014, 9:47 pm
Vessel Info: 1990 3807 Aft twin 7.4 Mercruisers
1984 3207 twin 270 Crusdaers
Location: Barrie, ON
Has thanked: 23 times
Been thanked: 5 times

Re: 1990 3807 heat/air issue

Postby Washopay » June 18th, 2016, 8:23 pm

It's been a while since I was on this (other problems). No drop in temp. Checked the refrigerant and recharged it. No drop in temp. The pump and the compressor both run. I'm stumped.
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Re: 1990 3807 heat/air issue

Postby waybomb » June 19th, 2016, 9:27 am

Is this aheat/ac unit?
If so, I believe there is a three way valve in the refrigerant line.
Check the electrical connection there.

Ps, I never dug into one of these, my knowledge is from working on Thermo kings many years ago on refrigerated trailers.
Thanks
Fred
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
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Past - 1988 2807, 1989 4207 Aft

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tomschauer
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Posts: 2002
Joined: March 28th, 2016, 10:52 pm
Vessel Info: 1998 Carver 355
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Re: 1990 3807 heat/air issue

Postby tomschauer » June 20th, 2016, 11:22 am

was there any refrigerant in it? If not did you find and repair the leak? If so did you remove the refrigerant, evacuate the system and add 12oz of r-22?

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Re: 1990 3807 heat/air issue

Postby Viper » June 20th, 2016, 9:38 pm

Have you checked to see if the heat cycle works? Reversing valve may be stuck.
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Topic author Canada
Washopay
Deck Hand
Deck Hand
Posts: 52
Joined: September 29th, 2014, 9:47 pm
Vessel Info: 1990 3807 Aft twin 7.4 Mercruisers
1984 3207 twin 270 Crusdaers
Location: Barrie, ON
Has thanked: 23 times
Been thanked: 5 times

Re: 1990 3807 heat/air issue

Postby Washopay » July 13th, 2016, 10:49 pm

I drained, recharged, checked for leaks. Nothing worked. Until this weekend. I turned it on . Out came ice cold air. I think I forgot to say abracadabra in the spring. Stupid me. :lol:

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