A/C AC Help Needed

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Dan

Dan

.
Jul 26, 2006
190
Hunter 420 Stamford
So, one of my more significant winter projects is to replace one of the A/C units. I had a MarineAir unit in there and now I'm putting in a CoolMar FCF unit (from Webasto). Both are 16k BTUs. My problem is the wiring. I've attached a photo with a scan of the FCF unit wiring diagram on the left; on the right is my drawing of the connections that were the MarineAir unit. There were two sets of wires going to the MarineAir unit: the heavier gauge wires were black, white and green and went to the "power" section. the lighter gauge were also black, white and green and went to the "pump" section. I just want to make sure I understand how they'd get reconnected to the FCF unit. I REALLY don't want to goof up that part of the project, for obvious reasons. Can anyone help in deciphering the FCF diagram? Also, I want to mount the electrical box to the inside of the hull. I thought I'd secure a piece of wood (teak?) using adhesive and then screw the box to the wood. Is this wise? Any suggestions as to the choice of wood and adhesive? Any other thoughts? Your help, as usual, would be greatly appreciated. Thanks in advance!
 

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Dan

Dan

.
Jul 26, 2006
190
Hunter 420 Stamford
So, one of my more significant winter projects is to replace one of the A/C units. I had a MarineAir unit in there and now I'm putting in a CoolMar FCF unit (from Webasto). Both are 16k BTUs. My problem is the wiring. I've attached a photo with a scan of the FCF unit wiring diagram on the left; on the right is my drawing of the connections that were the MarineAir unit. There were two sets of wires going to the MarineAir unit: the heavier gauge wires were black, white and green and went to the "power" section. the lighter gauge were also black, white and green and went to the "pump" section. I just want to make sure I understand how they'd get reconnected to the FCF unit. I REALLY don't want to goof up that part of the project, for obvious reasons. Can anyone help in deciphering the FCF diagram? Also, I want to mount the electrical box to the inside of the hull. I thought I'd secure a piece of wood (teak?) using adhesive and then screw the box to the wood. Is this wise? Any suggestions as to the choice of wood and adhesive? Any other thoughts? Your help, as usual, would be greatly appreciated. Thanks in advance!
 
Ken Honeycutt

Ken Honeycutt

.
Dec 27, 2005
500
Hunter 36 Chicago
I can answer the power question

The large black wire is your L1 (hot), large white wire L2 (neutral). They show a P and another X(n) connection which would be P for the small black and N(x5) for the small white. The green wire is ground. Didn't see a ground post (there should be one) on the new diagram but maybe I didn't look hard enough. If there is one, that's where the green wire goes.
 
Ken Honeycutt

Ken Honeycutt

.
Dec 27, 2005
500
Hunter 36 Chicago
I can answer the power question

The large black wire is your L1 (hot), large white wire L2 (neutral). They show a P and another X(n) connection which would be P for the small black and N(x5) for the small white. The green wire is ground. Didn't see a ground post (there should be one) on the new diagram but maybe I didn't look hard enough. If there is one, that's where the green wire goes.
 
Ken Honeycutt

Ken Honeycutt

.
Dec 27, 2005
500
Hunter 36 Chicago
Ground

Dan, Your green wire (ground) should be grounded back to your shore power recepticle. The ground prevents you from getting shocked in case the AC enclosure somehow shorts or touches the AC hot (L1) so yes, your AC box will be grounded once you connect the green wires to the ground post. You're on the money as far as the rest of the connections. Just as an aside, are you installing a new thermostat or just using the existing one? You may have a different time delay setting for your compressor restart if you've replaced the thermostat...I was fooled by this when I installed an AC in my old 31 Hunter...thought I had a bad thermostat.
 
Ken Honeycutt

Ken Honeycutt

.
Dec 27, 2005
500
Hunter 36 Chicago
Ground

Dan, Your green wire (ground) should be grounded back to your shore power recepticle. The ground prevents you from getting shocked in case the AC enclosure somehow shorts or touches the AC hot (L1) so yes, your AC box will be grounded once you connect the green wires to the ground post. You're on the money as far as the rest of the connections. Just as an aside, are you installing a new thermostat or just using the existing one? You may have a different time delay setting for your compressor restart if you've replaced the thermostat...I was fooled by this when I installed an AC in my old 31 Hunter...thought I had a bad thermostat.
 
Dan

Dan

.
Jul 26, 2006
190
Hunter 420 Stamford
Thanks a bunch, Ken

This really helps. The old unit was shot -- rusted, and the compressor was kaput. This is a self-contained unit that comes with an integrated control panel and thermostat, so I have no preconceived expectations on the compressor restart timing. My work is to shoehorn the thing into the available space and connect wires, ducting and hoses. By the way, does my idea for securing the electrical box make sense? I figure I'll glue a piece of marine plywood or pressboard or something to the inside hull and mount the box to it. Again, thanks, Ken. I really didn't want to take any chances. My insurance company would have been very angry with me if I put in for a new boat because of a fire. ;o)
 
Dan

Dan

.
Jul 26, 2006
190
Hunter 420 Stamford
Thanks a bunch, Ken

This really helps. The old unit was shot -- rusted, and the compressor was kaput. This is a self-contained unit that comes with an integrated control panel and thermostat, so I have no preconceived expectations on the compressor restart timing. My work is to shoehorn the thing into the available space and connect wires, ducting and hoses. By the way, does my idea for securing the electrical box make sense? I figure I'll glue a piece of marine plywood or pressboard or something to the inside hull and mount the box to it. Again, thanks, Ken. I really didn't want to take any chances. My insurance company would have been very angry with me if I put in for a new boat because of a fire. ;o)
 
Ken Honeycutt

Ken Honeycutt

.
Dec 27, 2005
500
Hunter 36 Chicago
Dan, don't see a problem with your plan

When I installed A/C on my 31', I glued a piece of marine plywood on a fiberglass shelf using west epoxy and set the compressor assembly on top of the plywood. Never had a problem with it. Shouldn't be any different than your plan.
 
Ken Honeycutt

Ken Honeycutt

.
Dec 27, 2005
500
Hunter 36 Chicago
Dan, don't see a problem with your plan

When I installed A/C on my 31', I glued a piece of marine plywood on a fiberglass shelf using west epoxy and set the compressor assembly on top of the plywood. Never had a problem with it. Shouldn't be any different than your plan.
 
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