1nolaguy Posted April 10, 2022 Share Posted April 10, 2022 Yesterday we had both of our old Dometic Duo-therms, that had died, replaced with new Houghton A3800 heat pumps from Recpro. One small thing turned what should have been a relatively quick process in to a long drawn out affair. The Houghton units arrive complete with everything you need for most installs. The catch is the 4 hex head bolts that draw the roof unit to the ceiling bracket that forms a tight seal. Houghton provides the 4 bolts that are suitable for most installation on roofs up to 5-1/2 " thick that are flat. If you have a slightly curved roof like the one on out 2005 Safari Cheetah there is included a 1-1/4" thick foam rubber gasket to isolate the A/A from the roof and provide proper seating. Unfortunately, the gasket combined with the thickness of our roof resulted in the the bolts being about 1-1/4" short. The Duotherm bolts on the old units were long enough but were 1/4"-20 coarse thread. The new bolts supplied by Houghton are M8-1.25 metric fine thread. Our solution ended up being to use M8-1.25 threaded rods plus M8-1.25 couplings in conjunction with the supplied bolts. Because of the length of the supplied bolts they had to be cut, as well as the threaded rods. I ended up having to drive to 3 different stors in three different towns to find all the parts needed to complete the install. If you are planning to install Haughton a/cs on a thick roof coach I recommend getting the proper length bolts in advance of starting the install so that it will go much easier and quicker. Without the bolt issue this would have been a very quick and easy install. The new A/Cs are great! 1 Link to comment Share on other sites More sharing options...
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