You may want to consider the drawing (Fig 10 on page 25) of this PDF link http://www.dometic.com/FileOrg.....ration.pdf when connecting hoses to your manifold/s

You will be able to feel a difference in coil temps if one is starving...feel the bottom coil of each unit, and the bottom of each coil on the dual condenser unit.

Again...The only reason they go with dual condensers is the available length of that condenser tubing...When the unit's capacity exceeds one length's ability to remove the proper amount of heat...Two shorter lengths that add up to the proper formula are used, and the refrigerant plumbing is tee'd into & out of ...]]> Mon, 06 Sep 2010 11:57:57 -0500 http://marine-ac.com/forum/troubleshooting/routing-seawater-cooling-hoses/#p885 Troubleshooting http://marine-ac.com/forum/troubleshooting/routing-seawater-cooling-hoses/#p885

I am going to do as you say and split my water hoses into four runs, one for each coil and, in total, I have four coils wrapping around 3 condensing units with one of the 24K’s having dual coils and the other 24K having only a single one. In planning this, I am looking at the math and equipment I will have and have a question about adequately cooling the older 24K condensing unit. The TE-5.5C-MD pump is 30 GPM. If split that four ways through each of the four equally sized hoses and all hoses splitting off and coming back together at the same point, is it fair to say that each hose will be delivering 7.5 GPM (30 ÷ ...]]> Mon, 06 Sep 2010 10:18:49 -0500 http://marine-ac.com/forum/installation/replacing-a-condensing-unit/#p884 Installation http://marine-ac.com/forum/installation/replacing-a-condensing-unit/#p884 SeaDoc~

1) That would depend on what you are replacing & where it's located…Cruisair has discontinued the "F" series units that were most common…The base of those units was 13 wide x 18 deep…The "R" series is 13 x13, so if this unit is in a rack it may not fit correctly, and you may need to modify the rack to support it…

2)  The condensing unit & air handler must match !!!…You cannot connect a RX12 to a 16,000 air handler and have the system work properly…Take my word for it…It just won't work….and it will void any warranty on the new unit.

If you want to downsize (which I would not recommend on that size boat/salon) You will need to change out the air handler to a 12,000 ...]]> Sun, 05 Sep 2010 09:37:43 -0500 http://marine-ac.com/forum/installation/replacing-a-condensing-unit/#p883 Installation http://marine-ac.com/forum/installation/replacing-a-condensing-unit/#p883 Two questions:

1) How hard is it to replace a condensing unit - Cruisair RX 16C? I realize I'll need a tech to charge/test the system but could save a few $ by doing most of the work myself. I'm a mechanical engineer and reasonably handy.

2) I can get the RX 16C for about $2000. I may also have access to a RX 12C for a fraction of that cost. I realize the RX 12C capacity is only 75% of the RX 16C but wonder if I can get by with it since the cost differential is significant. The boat is in northern waters (New England, Great Lakes, etc) during the summer and FL in the winter. Do you have ...]]> Sun, 05 Sep 2010 07:56:53 -0500 http://marine-ac.com/forum/troubleshooting/routing-seawater-cooling-hoses/#p882 Troubleshooting http://marine-ac.com/forum/troubleshooting/routing-seawater-cooling-hoses/#p882 Yes, it does heat, but I don't use the heat on it. I understand that the heat function operates at a higher pressure. Last time I used heat, I blew out the fittings on one of the solenoid valve manifolds and had to build an entirely new one from scratch. So, I'm too afraid to run the heat for fear of blowing up more of the 30-year-old joints in that system. I am babying this thing along very tenderly for as long as I can. In Miami, a few space heaters on the very, very few nights I need them, work fine. Although, last winter was a freak of nature, and I used them a lot! I never ...]]> Sat, 04 Sep 2010 12:31:59 -0500 http://marine-ac.com/forum/troubleshooting/routing-seawater-cooling-hoses/#p881 Troubleshooting http://marine-ac.com/forum/troubleshooting/routing-seawater-cooling-hoses/#p881 Initially, the dealer installed a RM24C. After nearly year’s worth of constant service calls because the unit would not function properly, they figured out it was the wrong unit and admitted that it would never work right with my equipment. The dealer and the regional rep got into a pissing contest over whose fault it was, all the while I had to wait for them to finish their fight before I could get my problem fixed and have air conditioning again. I got tired of waiting - they had my thousands of dollars and I didn’t have the right equipment and didn’t have reliable cooling. So, I finally contacted the trio of Butch Prince, Louie Swingle and John Barnett, and collectively, ...]]> Sat, 04 Sep 2010 12:26:33 -0500 http://marine-ac.com/forum/troubleshooting/routing-seawater-cooling-hoses/#p880 Troubleshooting http://marine-ac.com/forum/troubleshooting/routing-seawater-cooling-hoses/#p880 Curious Angela...Does your modulating system still heat ?

If so...That could be the reason for the special order condensing unit...The new modulating systems are not reverse cycle (no reversing valve on the condensing unit)) but have heat strips in each air handler.

Steve~