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Old 01-30-2017, 01:37 AM   #1
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What would this relay be for?

I am still trying to figure out the electrical system in my boat. Does anyone have any ideas what this relay might be for? It is on my 120v panel. I haven't yet been able to trace the wires.Click image for larger version

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Old 01-30-2017, 05:23 AM   #2
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I am still trying to figure out the electrical system in my boat. Does anyone have any ideas what this relay might be for? It is on my 120v panel. I haven't yet been able to trace the wires.Attachment 61120

Hey, this component is the building automation and HVAC controls, is the air conditioning / ventilation, if so, in my opinion, it is this system component.

you have a fairly new boat, if you have a wiring diagram Drawing, exploring for and what path to take

http://www.functionaldevices.com/bui...l=RIB2401SB-NC
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Old 01-30-2017, 05:23 AM   #3
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Hmmm, the ratings are both AC and DC. Could be a relay that links your battery system to the inverter/charger. When off the charger just manages the house, when on all of the batteries are linked - house, genny, starts.

I have a Pathmaker Heart Interface switch that does that.

If you have a wiring schematic you should see that on there and be able to see what it is relaying. That is how I found out what my Pathmaker switch was for.
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Old 01-30-2017, 05:44 AM   #4
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It appears to be a 20 amp AC relay. Maybe it switches certain outlets to your inverter?

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Old 01-30-2017, 05:48 AM   #5
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Air Cond water pump?
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Old 01-30-2017, 08:05 AM   #6
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You could trace the wires or you could find the boat's electrical diagram and try to figure it out from that.


Or, you could turn if "off" and see what doesn't work. Turn it "on" and see what does work.


Note: The 24 volt coil is often used in HVAC controls. If your boat has the standard 12 volt DC system, I would start looking in the HVAC system.


Of course if everything seems to work, you don't really have to know what the relay does.
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Old 01-30-2017, 08:14 AM   #7
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My first thought is a HVAC water pump.

Turn stupp on and off while listening for the contacts to close. Start with the HVAC.
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Old 01-30-2017, 10:13 AM   #8
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Thanks for thoughts folks. This boat doesn't have an HVAC system.
I will pull up the schematics for the boat but I have already found a number of owner modified changes.

I think Ted and Menzies may be on to something.
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Old 01-30-2017, 11:38 AM   #9
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Engine room ventilation fans??? AC driven fans with 24Vdc start signal from engines?? Or 24Vdc manual switch up on helm? They don't like running AC under helm panels for safety reasons.
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Old 01-30-2017, 11:41 AM   #10
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Engine block heater?
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Old 01-30-2017, 11:55 AM   #11
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Old 01-30-2017, 12:08 PM   #12
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The 24 vac/or 24vdc coil is the odd part of this. why add a step down transformer just to activate a relay... when relays are available in 120vac or 12 vdc.... so the next question is what kind of furnace do you have on board,,, or it may feed the 120vac to the inverter/charger.... what about thrusters are they 24volt if so are the batteries separate and with their own charger.... The easiest way to find out is to turn it off and see what doesn't work...
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Old 01-30-2017, 01:34 PM   #13
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The interesting thing is that is I turned it off a while ago and could find nothing that was affected.
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Old 01-30-2017, 01:45 PM   #14
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Do you have electric heater of some kind that you can turn on for the engine room? I am thinking it is for a heater of some kind, either engine room or engine block, something that would use shore power when you are away from the boat.
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Old 01-30-2017, 02:32 PM   #15
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Do you have electric heater of some kind that you can turn on for the engine room? I am thinking it is for a heater of some kind, either engine room or engine block, something that would use shore power when you are away from the boat.


No engine heat. The only furnace we have is a diesel furnace.
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Old 01-30-2017, 02:42 PM   #16
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Relay in a box

Awesome products, I have installed hundreds of them. They come in all flavors of control voltage and contact rating. It is a generic product not specific to any "system."

Edit - Also note the control side will accept a variety of input voltages to include 120 VAC, not just 24 VAC, VDC. I loved using them, they have an LED that light up when energised, some have HOA's built right onto them.

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I am still trying to figure out the electrical system in my boat. Does anyone have any ideas what this relay might be for? It is on my 120v panel. I haven't yet been able to trace the wires.Attachment 61120
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Old 01-30-2017, 02:57 PM   #17
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The interesting thing is that is I turned it off a while ago and could find nothing that was affected.
Leave it off and monitor your battery charges.
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Old 01-31-2017, 12:32 AM   #18
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I have a relay that enables charging the 2 X 12 volt AGM batteries via the Balmar Digital Duocharge, switching off when the 24 volt bow thruster is in use. I wonder if this is related somehow to the charging of a 24 volt system?
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Old 01-31-2017, 08:15 AM   #19
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Can you contact previous owner?
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Old 01-31-2017, 08:25 AM   #20
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Could you pan out and take a couple more pictures?
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