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Mermaid won't stop
November 30, 2011
1:08 pm
q240z
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November 26, 2011
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That is a very slick looking thermostat. For this Connie, which is up for sale, it's a lot more bang than I need. But I'm refitting another boat and will keep this in mind. I really like the idea of a dehumidifier function.

November 28, 2011
12:02 pm
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Steve Pooler
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You can use most any Home T-Stat or I can offer you one of these...(just picked up dealership)

 

** you don't have permission to see this link **

 

Steve~

November 28, 2011
10:40 am
q240z
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Excellent! Do you sell replacements for these, or is any programmable 4-wire thermostat acceptable?

November 27, 2011
7:36 am
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Steve Pooler
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If it will shut completely off in the off position of that T-Stat switch...Good...You don't have a bad contactor or fan relay.

 

I would say you have a bad Hunter thermostat that is not cycling it's own little relay to cut power to the compressor contactor coil when setpoint is reached...It may not be seeing temp properly, or it just that the thermostat has failed.

 

Steve~

November 27, 2011
7:26 am
q240z
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Hi Steve!

The t-stat is a Mermaid branded "CTC/Hunter" model 43103 digital programmable thermostat. From Mermaid's website it seems they used these for many years but stopped in the early oughts. I must have gotten the last one going out the door. lol

 

The fan-only feature turns on and off when the fan switch is moved from On to Auto, as it should. The complete unit (fan and compressor) turns on and runs normally (ie kicks out heat or chilled air) when I turn it to Heat or Cool, it just doesn't shut down when it reaches the set temp. It does shut off completely when I switch it from Heat or Cool to Off. The only thing that's not happening as it should is that it doesn't shut off when it reaches the set temp.

November 26, 2011
9:29 am
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Steve Pooler
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Questions Q…

 

  • What kind of Thermostat…Mermaid offers a couple…Does it look like a home type T-stat ?
  • It does shut completely off with the T-Stat switch ?…Meaning both the fan & compressor ? 
Steve~
November 26, 2011
9:07 am
q240z
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Hi.

I've got a 2004 Mermaid 16kbtu self-contained reverse cycle unit in a 1967 Chris Craft Connie that suddenly won't stop cranking out the heat. Even with the Mermaid electronic thermostat/controller set to 65*, the unit stays on all the way up to 80*. It will only shut off if I move the selector switch from heat to off. Resetting the thermostat/controller with the "reset" button had no effect. Also, previously I could turn the switch from off to either heat or cool and it would take a few seconds (and sometimes longer) before the unit would kick on even if the temperature was at a point where the controller should have been calling for heat or cooling. It always kicked on eventually though. Now, as soon as I move it to heat it kicks on immediately.

I just tried it on cool and the same thing happened--even though the controller should not be calling for cool, it kicked on immediately.

Thanks in advance for any suggestions you might have for me.

Cheers,

Q