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Marine-AC Topics
Troubleshooting
Compressor not running on a WFAH 16k – continued from Hatteras Forums

Compressor not running on a WFAH 16k – continued from Hatteras Forums
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Mike

posts 2

9:16 am June 24, 2011
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Steve,

 

Good morning!, thought I would post here instead of Hatteras forum.

 

Location is Morehead City NC, boat is a 1969 Hatteras 53' MY. Air condition system is not a orginal Hatteras install. Units are approx 5-6 years old. I have (2) WFAH remote 16k system. (2) WFAH remote 8k systems. Units have the retro and SMXir control panels. Units are also tied in with multi trigger unit for the sea water pump.

 

To bring you up to date:  A/C – advice from SeaWhisper

 

Quote:
Originally Posted by SeaWhisper
Steve,

Again thanks for the help! by chance do you have the PDF training piece ….Link?

Steve, was getting ready to check the readings between the three contact points on the compressor. Not sure if this means anything… I set volt meter to continuity… tone… placed one lead to "C" contact and the other to ground.. results was open, no tone. Next placed the lead on the "R" contact and the other to ground.. results was open, no tone. Then checked the last contact "S" again the second lead to ground.. results was shorted, received a tone. Is this an indication of anything with the compressor?

Thanks,

 

Mike,

"SeaWhisperer"
1969 Hatteras 53' MY
Morehead City, NC.
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Steve Pooler

posts 1127

10:06 am June 24, 2011
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Hi Mike…Thanks for joining & posting here~

I will answer here but also finish over there with a link to this thread in case anyone over there wants to follow….

 

Simple answer is yes we have a problem with the compressor…The compressor motor has two windings (Start & Run)…The "S" terminal is for the Start winding which is larger (and stronger) than the run winding…The start winding is there to momentarily help to get the compressor up to speed, then it drops out & the run winding takes over…

From your measurements…The Start winding is "Shorted" to ground….This will cause the compressor overload to trip (meaning interrupt voltage to the compressor) but it will auto reset (unless it too has failed from the dead short)

This is why I was asking if it was even trying to start…Apparently your meter (boat installed) is not reading the A/C's line or else you would see this spike….

Sorry Mike…But I'm afraid you need a new compressor (over $700 from Dometic) and the compressor that will operate at the correct pressures is only available from Dometic…Supply house conversions never seem to match well at all…

The other choice is a new condensing unit…

Steve~
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Mike

posts 2

10:31 am June 24, 2011
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Steve,

 

Thanks for the help. Do you have the time for a phone call on the pricing for a replacement or a WFAH 16 if one is on the shelve.

 

Mike,
Admin

Steve Pooler

posts 1127

10:40 am June 24, 2011
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Call Away Mike…But make it soon please I'm trying to get out of here before noon to do a call…

 

Steve~
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Steve Pooler

posts 1127

12:09 pm June 25, 2011
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Post edited 12:13 pm – June 25, 2011 by Steve Pooler

Mike & I talked yesterday, and he is now considering an upgrade to the salon system…The Hatt 53 MY in 1969 was pretty shy on A/C originally, and now might be the time to replace the R-22 system with the new 410a stuff & increase his cooling capacity too.

At first we talked about just increasing his fwd salon air handler (also blows down into the galley fwd) size from 16K to 24K & removing the single 7-8K condensing unit for the aft salon…We would then install a 230 volt 30K condensing unit (also removing the bad 115 volt 16K unit) and tie the refrigerant lines together for both salon air handlers & operate them from a singe SMXir control…

Below is a partial copy of the e-mail I sent him this morning so that folks watching might see the advantages of a plan, and what can be accomplished with newer equipment  Wink

 

Edit: Hummmm….Sorry all…The text editor won't allow me to enlarge the font…Guess you will have to squint unless I can figure out how to edit it…

Steve~

 

Hi Mike~
 
After our conversation yesterday…It came to me (don't know why it didn't when we were talking)…You won't be able to use the 8K air handler in a 410a refrigerant system…
The metering devise is not calibrated for 410a, and the tubing walls are not made for the higher pressures of R-410a…
 
I you want to keep that air handler and run it as a slave off the other new one, the problem with that is it's 115 volt and we can't have dual voltages on one control, and we will need to order 417a (R-22's drop in replacement) equipment for the rest of the system…So we would still at least need to replace that blower assy on the 8K, or replace it altogether anyway…
We can do this and still go with the plan of a 30K condensing unit with a new 24K AH fwd…But I also have another idea to use 410a equipment which is not a bad idea if you plan on keeping the boat…
 
The new idea is to go with a 36K condensing unit, a 12K AH aft, and a 24K fwd….This will give you a full Ton (12K) more A/C in the upper/mid deck areas instead of just really a half ton (6K) over what you have now…
All this while only drawing a total of 13.73 amps @ 230 volt in cooling…As I figure your amp draw with the two existing systems (from old spec guide & with units in like new condition) I come up with 27.6 amps @ 115 volt (on one leg)
 
You have 2 choices of Air handler style for forward (that will affect pricing, and also add 1.18 amps to the above figure for the extra blower) but I need you to look at the specs to see which may be better suited for the area it will live…One is a dual blower low profile type that you could run one duct from one of the blowers to get a full ton of A/C into the galley area…The other 12K blower would go to the fwd salon (remember we are adding to the size of the aft AH to compensate) and it would still give you a full 24K
(2 tons) in the salon…http://www.dometic.com/cf0d453…..1dc3.fodoc
 
The other is a single blower type that you would split ductwork for galley/salon with a duct splitter…http://www.dometic.com/669dd4c…..7532.fodoc
 
Here is the AH I would recommend for the aft salon (12K 230 volt)…http://www.dometic.com/4380cc3…..6000.fodoc
 
Also…Here are the specs on the condensing unit for your info…and to be sure it will fit in your rack…http://www.dometic.com/9099854…..57c8.fodoc
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