AC Pump relay

J

jmauld

Well-Known Member
Jun 9, 2020
2,844
Carolina Beach
Boat Info
2010 Sundancer 390
2016 Sea Hunt Ultra 211
Engines
Twin 8.1l of gas guzzling iron
Can someone give me a rundown of how this system works or how it is wired?

I see the relay box behind the electrical panel. I’m half blind and have trouble reading it. But it looks like it’s rated for 25A. I assume that’s the switched load rating.

My schematics don’t show how this system is wired, but when my AC turns on, that relay adds very little current draw. Is it providing 120V to the water pump? Is it safe to assume that pump pulls little power?
 
I’m guessing that’s the case. I’ll take a better look tonight but there were some substantial AC lines running through the box, which was confusing me. I’ll open it up again and spend more time on it.
 
I think you will find the raw water pump to be 120VAC or 240VAC (like mine) and that pump is turned on and off by the Dometic Cruiseair Pump Relay box. For each air conditioning unit on the boat there will be a "trigger" installed in that relay box. When one of the HVAC units demand cooling or heating it first sends a signal to the trigger to start the pump then five seconds later starts the compressor. Each HVAC unit can independently turn on/off the raw water pump; that is the purpose of that relay box.
 
Just curious if your having and issue??

The actual schematic is inside the lid of the pump relay box. The "triggers" are wired to each AC unit you have. There are 115VAC and 220VAC triggers depending on you AC units. These are replaceable items for about $60 each.

Power for the pump comes from the AC panel, through the relay box, then out to the pump.

upload_2023-3-10_10-8-10.png
 
No issues. Just doing some re-balancing of my panel so that I can put inverter loads on one line. Trying to figure out how much of a load the pump system demands.
 
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