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Old 13-07-2020, 18:08   #1
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Wiring up a AC raw water pump relay.

I have two AC units (one 16k BTU, and the other 8k BTU), each with separate raw water pumps pulling from a common strainer and through hull. Apparently this is not a good setup, and I often see poor water flow to the smaller unit. Dometic recommend using a single pump with a relay board to energise the pump when either AC unit need water flow. I picked up a board, but I have some questions regarding the wiring. Looks like I need to run a new AC line from the breaker panel to the relay board - annoying, since there's already power to both pumps. The real question is the trigger wiring. Do I simply connect the live and neutral wires from that used to go to the pump(s) to the trigger (and the ground to the ground stud in the relay box), or do I need to run new wires from each AC unit to the relay? The documentation does not specify...

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Old 14-07-2020, 15:43   #2
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Re: Wiring up a AC raw water pump relay.

The pump outputs from each unit hook to each units trigger/relay in the relay box.
Power from New pump breaker to line in terminals in relay box.
New pump wires to pump terminals in the relay box.
Simple.
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Old 14-07-2020, 15:57   #3
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Re: Wiring up a AC raw water pump relay.

Look at figure 25 on page 34 in dometic manual L-2086
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Old 16-07-2020, 06:59   #4
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Re: Wiring up a AC raw water pump relay.

Quote:
Originally Posted by Coolerking View Post
Look at figure 25 on page 34 in dometic manual L-2086
Thank you!
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