No power from Cutwater 30 air conditioning unit to cooling p

[Dritchie]

Background....the air conditioning cooling pump burned itself out due to the loss of prime and was replaced with a new pump. The electrical lead for the new pump was made by cutting the original wire at the old pump location and a female tri plug 110V receptacle installed. 110V power to the new pump was provided by simply plugging into this receptacle with no change to the pump's wiring. This also avoided any changes to the circuitry at the compressor end or control functions of the A/C unit. Unfortunately, when starting the system the pump does not turn on, although the compressor and other A/C components do.
Unplugging the pump and plugging into a separate and independent 110V power source the pump runs beautifully. Two strong water effluents exit from the port A/C drain thru hulls. Now, with the cooling waters circulating using this separate power source, and if you start the A/C unit,it operates 100% correctly. I ran the unit through a full range of heating and cooling and it operated as required. I also tested the female triplug for 110V power (the lead from the compressor/control function) using a multi meter. There was no power.
The two fuses, marked pump, located in the lower quarter berth are 100% ......there has to be a simple answer as to where I screwed up....thoughts
Dritchie

 

[knotflying]

It sounds like you are not getting power to the plug outlet. Are you sure the old pump was burned out? I am far from being and air conditioner expert, but it sounds like something in the unit is not allowing power to the pump. Perhaps a relay or a burned circuit board? Is there an internal fuse in the unit for the pump? Usually when there is no prime the unit will shut down on it's own. Why did your pump continue to run and then burn out? Something from your original issue seems funky.

 

[Matty]

I am having a pump issue as well. Based on what I have learned the pump comes on after the fan and compressor. The control box (not the digital controller) sets this series in motion when you turn on a/c. The power for the pump comes from the box. When you plug it into a separate independent plug it bypasses this series and the motor comes on. So you still have a problem that tells the control box not to turn on the pump. Without the pump the unit should overheat. I would imagine if you test the wires going into power box you added there would be no voltage coming in.
In my case they thought it was an airlock in the water line and provided instructions on how to purge the line using a garden hose. I do not think that is my issue. I get a E3 error code which would indicate low refrigerant. Since it is still under warranty I will have to pursue that avenue.
Did you test the old pump on an independent plug to be sure it is burned out?

 

[BB marine]

I had an issue last year of no fan. After several attempts to reset the system I started a troubleshoot procedure. I found this PDF and used it for troubleshooting. If you can get to the control box which is located close to the compressor /fan assembly you can trouble shoot the Triac Board. Page 29 shows a diagram of the circuit board. The terminals are labeled on the diagram illustrating which terminal to check for power for each function. In my case the fan was not turning on so I checked voltage at the fan terminals no power at terminals but power coming into panel indicted the board was bad. In your case you want to check voltage at the pump terminals if you have power there then I would suspect a bad solenoid. If you have one pump for two units the power for the pump at the Panel goes to a solenoid to turn the pump on and off when required from either unit. If the pump doesn't turn on when using both units I would suspect a bad solenoid. The hardest part for me in troubleshooting was getting to the control box . It was mounted behind the unit and not accessible without removal of the complete compressor/fan unit.


http://www.tropicalmarineairconditionin ... rt-I-O.pdf

 

[Boatagain]

The two fuses, marked pump, located in the lower quarter berth are 100% ......there has to be a simple answer as to where I screwed up....thoughts
Dritchie

I’m guessing you’re referring to the circuit breakers, not fuses, in the AC panel? I noticed you said “two”. There needs to be three breakers on: Aft Air, Fwd Air and Air Relay. Wouldn’t it be nice if it were that simple? Good luck.

 

[Dritchie]

Thank you all...in particular Matty and BB Marine as you caused me to think outside the box... problem bypassed but not resolved which I will leave to the factory gerus. The original test, after installing the new pump (and for those who question what a burned out pump looks like I can send you photos of pump internal ceramics which look like spaghetti and beyond the circuit breakers there are at least two fuses,40 amp and 10 amp, plus others and to which pumps ?...I digress) original test was flashing up only the after (salon) air conditioning circuit as the boat is moored at the foot of my home lot which has only a 15 amp circuit.... Matty and BB got me thinking maybe both A/C units have to be on to turn on the coolant pump. Fired up the generator. Turned on both A/C units ....bingo pump eventually came on. Apparently my circuitry is unique....pump comes on with fwd A/C unit, pump comes on with both fwd and aft A/c units on, pump does not come on with aft A/C unit only on and in fact the pump shuts down in going from both A/C units on to the aft (salon) unit only. Go figure..Gotta be one of the laws of nature associate with Climate change but works for me....my thanks

 

[BB marine]

I don't think it is an issue of how your circuitry is. I would suspect the Triac circuit board or internal relay on aft unit has failed. No voltage at pump terminal that is shown in the illustration when the air unit is turned on. If there isn't power at the terminal the multi unit pump relay is not activated and pump will not turn on. When the fwd air unit is on ( working properly) it has activated the multi unit solenoid and the pump runs. The issue is in the aft air unit. The control box circuit/system is not powering up the pump circuit and not applying voltage to the multi unit solenoid. There is power because the unit works (except pump) the pump circuit has failed or as simple as a loose or failed connection at the terminal strip. Quick and easy troubleshoot test voltage at terminal strip marked pump. No voltage, connection good, controller issue, internal relay, or triac circuit may have failed.

 

[Dritchie]

Thank you Brian. I think that you are onto it. When I have a spare weekend I shall pursue your thought pattern with my multimeter. ....so thank you. In the meantime I have my bypass. I also have your id, so stay tuned for the idle weekend for an update and I greatly appreciate your assistance and Cutwater for providing this forum. 🙂