Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 26-07-2020, 07:07   #1
Registered User

Join Date: Apr 2009
Location: West Palm Beach
Boat: Parkins Herreshoff 28
Posts: 851
AB cold machine, compressor air flow ideas....

I am installing a new ab cold machine in my little herreshoff 28. The compressor will be mounted in the cockpit locker behind the ice box

When i read the instructions this locker surely does not meet the ventilation requirements... and will often be crammed full, even around the compressor... not good i know...

I am thinking to build a box around the compressor (to protect it from the contents of the locker), and install a blower and ducting to pull air in from the cabin and discharge it into the cockpit...

I feel good about this plan other than the additional amp draw of the blower... has anyone ever done anything like this?

Also where should i connect the blower power on the compresser so that the blower kicks on and off with the compressor and is not always running when the fridge breaker is on?

Thanks
Ben
pressuredrop is offline   Reply With Quote
Old 26-07-2020, 07:19   #2
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,322
Re: AB cold machine, compressor air flow ideas....

You could tie into the fan wire and use a relay so it only draws the power required to close the relay, I believe you can only pull a low current from the fan wire before the controller shuts down.

You could also not touch the compressor wiring at all and use a thermistor to turn the blower on and off based on air temp inside of the locker.
a64pilot is offline   Reply With Quote
Old 26-07-2020, 07:19   #3
Registered User

Join Date: Jun 2019
Posts: 193
Re: AB cold machine, compressor air flow ideas....

I don't think the module that drives the system will support the additional load of a 2nd fan, I could be wrong, and maybe Richard will chime in on this, but you could run external power and control the fan with a cheap tstat that cycles on then the space gets warm.
Also many of the units come with a plenum designed to accept a duct to pull air to the condenser from outside the space its mounted in. You might be able to order one for the very unit you have.
Coolerking is offline   Reply With Quote
Old 26-07-2020, 07:34   #4
Marine Service Provider

Join Date: Aug 2004
Location: Ft. Lauderdale
Posts: 1,479
Re: AB cold machine, compressor air flow ideas....

A new AB would indicate it is CU100 or CU200 that has a 5 amp fuse on panel designed to carry a secondary fan or water pump. The primary condenser fan circuit is limited to 1/2 amp. It this unit is operated on 24 volts the fans are still 12 volts.
Richard Kollmann is offline   Reply With Quote
Old 26-07-2020, 07:46   #5
Registered User

Join Date: Apr 2009
Location: West Palm Beach
Boat: Parkins Herreshoff 28
Posts: 851
Re: AB cold machine, compressor air flow ideas....

Richard i know your the expert here... any thoughts on boxing in the compressor and forcing air around it?
Would it be better to put the blower on entrance or exit to the box... my guy says exit...
pressuredrop is offline   Reply With Quote
Old 26-07-2020, 10:29   #6
Marine Service Provider

Join Date: Aug 2004
Location: Ft. Lauderdale
Posts: 1,479
Re: AB cold machine, compressor air flow ideas....

Think of it this way heated air from refrigeration must be disposed of outside box it is installed in and mixed with cabin air or dumped into bilge. We are only dealing on average 300 btu per hour, about the same a a person moving around in boat.

There are two good ways to move this heat from heated area:
1. Install a second fan blowing air into compartment that will tend to pressurize the area, then provide exit holes for heated air to escape.
2. The most efficient way to control condensing unit and compressor heat is to position unit so condenser fan is sealed against a louvered opening drawing cabin air in and through condenser and fan. Again there needs to be holes for heated air to escape.

If you do not exit heat and bring in ambient air from cabin your unit will not be efficient. Air temperature interring condenser should be less than 90 degree F.
Richard Kollmann is offline   Reply With Quote
Old 26-07-2020, 11:07   #7
Registered User

Join Date: Sep 2017
Location: Langley, WA
Boat: Nordic 44
Posts: 1,316
Re: AB cold machine, compressor air flow ideas....

A cockpit locker would not be a good location for the compressor. Besides the ventilation issue you already identified salt water exposure would be a killer. Corrosion would destroy the controller module and the circuit board. The cold machine comes with fairly long tubing. Take advantage of that and find a better place.
stormalong is online now   Reply With Quote
Old 26-07-2020, 12:19   #8
Registered User

Join Date: Nov 2017
Location: Portland, Oregon USA
Boat: Island Packet, Packet Cat 35
Posts: 508
Re: AB cold machine, compressor air flow ideas....

These little fans are good for 7cfm which is more than you'll likely need, are tiny and use almost zero current. I have them in my fridge and freezer
Cpt Mark is offline   Reply With Quote
Old 26-07-2020, 12:29   #9
Marine Service Provider
 
Scott Berg's Avatar

Join Date: Jul 2011
Location: Aboard
Boat: Seaton 60' Ketch
Posts: 1,188
Re: AB cold machine, compressor air flow ideas....

I'm with Richard; we often pump in cooler air from bilge areas for exactly this purpose
__________________
Scott Berg
WAĜLSS
SV CHARDONNAY
Scott Berg is offline   Reply With Quote
Old 26-07-2020, 16:11   #10
Marine Service Provider

Join Date: Aug 2004
Location: Ft. Lauderdale
Posts: 1,479
Re: AB cold machine, compressor air flow ideas....

Quote:
Originally Posted by Cpt Mark View Post
These little fans are good for 7cfm which is more than you'll likely need, are tiny and use almost zero current. I have them in my fridge and freezer
Seven Cfm fans are OK for tumbling air inside refrigerator but 30 to 80 CFM is required to dispose of refrigeration process heat.
Richard Kollmann is offline   Reply With Quote
Old 27-07-2020, 09:37   #11
Registered User

Join Date: May 2008
Location: daytona beach florida
Boat: csy 37
Posts: 2,909
Images: 1
Re: AB cold machine, compressor air flow ideas....

i had a similar problem with my cold machine. i was able to install it just inside at the aft cabin bulkhead. i ran a short hose through a hole i cut in the bulkhead and it vented into the port cockpit locker. i added a louver door vent on the locker side like they use on clothes dryers. worked great.

i also had a computer fan that i added to the box where the unit lived. it insured that cooler cabin air would blow over the unit. i put it directly above the computer module. as mr. koillman will tell you, keep that module cool.

don't know if they still have this on the cold machine. it was designed to be not only air cooled but also water cooled if you wanted it. i didn't want it, per advice from mr. kollman. to piower the pump there is, or was, an output on the control module for it. i plugged my computer fan into that output and it turned the fan on every time the unit started up. no special wiring required.

had mine for ten years before we sold the boat and had zero problems with it after the initial start up problem. which ab fixed immediately. free.
__________________
Take two at low eight
onestepcsy37 is offline   Reply With Quote
Reply

Tags
compressor

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Want To Buy: Danfoss compressor for AB large cold machine lucseawalker General Classifieds (no boats) 3 08-05-2019 22:37
Adler Barbour Super Cold Machine - Too Cold ! svfinnishline Plumbing Systems and Fixtures 8 29-01-2019 18:01
For Sale: Cold Machine Compresser & Cold Boxes DCGSAILING Classifieds Archive 4 16-12-2011 05:43
For Sale: NOS Adler-Barbour Super Cold Machine Fridge with Cold Plate ! Christian Van H Classifieds Archive 6 22-08-2011 20:20
Air-Cooled Compressor vs Air/Water-Cooled Compressor melidramatic Plumbing Systems and Fixtures 4 06-02-2011 08:35

Advertise Here


All times are GMT -7. The time now is 21:49.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.