AC pump?

[SCORPIO]

I recently had to replace the AC water pump on my '89 Sundancer. It runs whenever the AC is on. A dock neighbor told me it should only run when the compressor is running, which makes sense. I checked the wiring diagram and it is connected as per the Cruisair manual. Is there a good place to connect this pump so it will only run when the compressor is running? How are yours set up?

 

[rnbenton]

As far as I know and any unit I've evewr seen, if it's wired correctly to the A/C unit it should only run when the compressor is running.

What about the pump you replaced. Before it went bad did it run all the time or cycle on and off with the compressor?

If it is wired as per the wiring diagram and still runs all the time I'd give the A/C manufacturer tech rep and ask them.

Seems odd to me.

Bob

 

[SCORPIO]

Old one ran whenever the AC was turned on, even if it was just set to FAN. Seem odd to me too.

 

[cwms]

Some run only when compressor is on and some run all the time.
Mine runs all the time but it is also 1 water pump cooling 3 AC units.

 

[Bob J]

If relatively new; S/B able to program either way. I can have fan run either when compressor is running or not run when off.

 

[Robski97]

OLder models ran as soon as control knob was turned to fan. This is normal.

I dont remember the wiring diagram if u can find one i can tell u how to wire it for compressor only operation.

Rob

 

[PascalG]

most system have relays/trigger which will only turn the pump on when one of the compressor comes on. Compressor on, with jsut the fan running, the pump should be off.

not only does it save wear on the pump, and extends how often you need to clean the strainer, but it's also a safety feature. If something clogs the thruhull (plastic bag), the compressor(s) will shut down due to high pressure and that will shut the pump off as well.

 

[Ehoyles]

my sea ray has self contained A/C units which are hooked up through a A/C control box that turns on the pump when any of the 3 compressors are operational. Check to see if yours has such a control box

 

[Capt. Bill1]

Some run all the time and some don't.

As to which is better for the pump, most motors are happiest and run the longest if they are never shut down. Starting and stopping, cooling down and heating up tend to kill a motor faster then running continuously.