Argh, sorry about the rotated image in my set of photos... how embarrassing. Also, I included some unintended confusing information; the final photo
with the big white vent hose is the OTHER fridge, which is a DC front-loader. Richard, you correctly noted that there were two, but until I crawled in to start looking for answers to your questions, I didn't realize that I had mis-identified that image and thrown it in with the others. Oops.
The vendor of both was Sea-Freeze (Bellingham); I just met them at the Seattle Boat Show
, although that didn't really translate into anything quite so handy as a manual. But it's good to know who did the install!
Regarding my original pump question: I mentioned in my last post that "I'll test the baby pump" - after some thought (and buying
fittings), I'm not sure I should bother.... though I totally agree with you, Sailorchic, that it would move enough water to extract the amount of heat involved. But since it's not self-priming, it may be a pain and end up with a big air bubble... if not during the installation
, then perhaps after a haulout (especially if I forget to shut the system off and it quickly clears the hoses of raw water). This hasn't been an immediate problem, as I've been leaving the cabinet door open where the air heat exchanger
is located and it's cool weather
, but I do need to fix it. Do you folks think I should just replicate the pump that was there and stop tempting fate?
Back to identification, once we ignore the superfluous fifth photo
: the big AC refrigeration system is connected to TWO enclosures (are they both cold plates?). One is the photo of the top-loading fridge that I included with the Grunert logo, and the other is a nearby top-loading freezer
about 2 feet away, under the nav-station desk. It's a bit icy in there at the moment, so not photographable to reveal any system details... but they are the same system. The pic with the two gauges shows their temps.
Richard, you have me curious now... I'll get in there and take some fresh photos including the inside of the control box
. About 3 years ago I had a "maintenance event"... somebody had put a plastic inline fuse-holder unsupported in the middle of the wiring
harness to the hinged power panel, and it failed while I was not on board. While trying to figure it out, I opened that box... as I recall
, there are just 2-3 open-frame relays in there. Observing the system's cycling, it sometimes runs for just a few minutes, and other times goes for an hour or more... and this is in otherwise steady-state conditions with access and ambient temperature. I'm obsessively geeky about almost everything on the boat and am instrumenting things left and right with a data collection system, yet this has remained a mystery. I really appreciate your helpful insights and pointers to ejumacational resources!
(Again, other than the failed seawater pump, this system has been working just fine... at this point I'm mostly trying to understand it better.)