January 18, 2021 at 10:37 pm #225917Eduardo AcostaParticipant
Just discovered my boat didn’t come with a water pump for the water cooled Grunert Baysider that is sitting under the bed in the aft state room.
So trying to figure out what capacity that pump needs to be would be grateful if someone has this model unit and has a manual or could tell me what size water pump you use for its cooling
January 19, 2021 at 2:57 am #225923Bryan BywalecKeymaster
I believe the original design had it plumbing the flow thru condenser into the intake side of the engine’s raw water cooling circuit.
“The flow thru condenser is connected to the inlet side of the engine’s seawater system circuit. It should be mounted as close to vertical as practical. The sea water enters the bottom of the condenser and exits through the top. Use of water fittings of the same size or larger as the existing water supply to the engine are recommended. Reinforced marine grade hose should be used for the seawater circuit, and all fit-tings are to be double-clamped. Caution:Condenser must be connect-ed to the vessels bonding circuit.”
S/V Pelican, Hull 209
Siren Engineering, LLC
January 19, 2021 at 10:23 am #225926RichCarterParticipant
I have an original Grunert engine-driven refrigeration system on my boat. I suspect it was a factory option offered by Pearson. It’s been a service headache since I bought the boat many years ago. I had to learn to service it myself. The original York compressor was unreliable. I installed a Sanden car air conditioner compressor. It’s been much more reliable. I’ve replaced everything except the holding plates over the years. including a replacement water pump where I used a seawater washdown pump instead of hunting for an original replacement. The washdown pump is way too big for what the reefer needs but it works. It consumes a lot of power, approx 15A, but I don’t really care since the engine is running anyway.
It works very well. If I come aboard after a few days and start the system to cool the fridge, I have cold beer in about 30 minutes. It takes about 90 minutes of engine time each day to keep the fridge cold. I usually run about half in the morning and half in the evening. Since I’m not running a 12V electric refrigeration system, my batteries never get run down.
I’ve thought of replacing it with a large 12v system but what I have works and it would be a lot of work to convert, including upgrades to the ice-box insulation. If I kept my boat in a slip with shore power, this would not make sense.
If you have questions about the system I can probably answer them.
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