Intex Inflatable Spa - Pump Problems

[mmartell]

These pumps are known to fail. Usually the ceramic shaft holding the impeller breaks and if caught early enough another shaft can be fashioned from stainless or brass. I let mine go a little too long making noise and now after repair my pump has failed again and probably for good. I have not yet disassembled the unit to get to the pump to check for sure so this is a little pre-emptive.

New pumps cannot be sourced and genuine parts are not available either. I do have on hand another pump of similar size and flow rate (specs on either pump are sketchy!) and if it comes to this I will test it in system to make sure it is a suitable replacement.

THE PROBLEM:

The old pump ran off 12v AC the new pump needs 12v DC. What is the best way to make this happen without adding an external power source ? Can I rectify 12v ac to obtain 12v dc or is that way too simple ?

[stj]

Re: Intex Inflatable Spa - Pump Problems

if you rectify it, and smooth it, it will rise to about 15v.
that may not be an issue - it depends how hot the pump gets.

[CapLeaker]

Re: Intex Inflatable Spa - Pump Problems

If you convert AC to DC you have to multiply your AC voltage by 1.414
12 x 1.414 = 16.968V DC.

I don't think it is such a good idea, but I guess we need more details.

[stj]

Re: Intex Inflatable Spa - Pump Problems

i wonder if it needs to be smoothed - never done much with dc motors.

[jazzie366]

Re: Intex Inflatable Spa - Pump Problems

These pumps are known to fail. Usually the ceramic shaft holding the impeller breaks and if caught early enough another shaft can be fashioned from stainless or brass. I let mine go a little too long making noise and now after repair my pump has failed again and probably for good. I have not yet disassembled the unit to get to the pump to check for sure so this is a little pre-emptive.

New pumps cannot be sourced and genuine parts are not available either. I do have on hand another pump of similar size and flow rate (specs on either pump are sketchy!) and if it comes to this I will test it in system to make sure it is a suitable replacement.

THE PROBLEM:

The old pump ran off 12v AC the new pump needs 12v DC. What is the best way to make this happen without adding an external power source ? Can I rectify 12v ac to obtain 12v dc or is that way too simple ?

If you were to list how many A the pump needs, you can probably find a dc-dc step down converter, there are plenty of cheap ones on ebay that can handle 30A easily. The only thing you need to do is all a beefy rectifier. Get back to us on this and let us know so we can help you further.

[stj]

Re: Intex Inflatable Spa - Pump Problems

no, actually he may have a speed controller.
mmartell - is it variable, or just on/off??

[mmartell]

Re: Intex Inflatable Spa - Pump Problems

It's on/off, controlled by a relay. I never shut off the circulation pump anyway - always leave it on, just like the pool pump.

The specs on either motor are impossible to find.

Hoping to investigate this further this coming weekend.

[CapLeaker]

Re: Intex Inflatable Spa - Pump Problems

How about you run that DC motor with a external, variable PSU? Some Astron, Samlex or whatever...

[jazzie366]

Re: Intex Inflatable Spa - Pump Problems

It's on/off, controlled by a relay. I never shut off the circulation pump anyway - always leave it on, just like the pool pump.

The specs on either motor are impossible to find.

Hoping to investigate this further this coming weekend.

You could grab an ammeter (unless you have a clamp style one) and then hook it up to a car battery, and see how much it draws? We're gonna need to know that in order to get a proper setup going.

[mmartell]

Re: Intex Inflatable Spa - Pump Problems

How about you run that DC motor with a external, variable PSU? Some Astron, Samlex or whatever...

Was hoping to avoid that.

[mmartell]

Re: Intex Inflatable Spa - Pump Problems

You could grab an ammeter (unless you have a clamp style one) and then hook it up to a car battery, and see how much it draws? We're gonna need to know that in order to get a proper setup going.

Can a standard multimeter measure this without burning it up ?

[stj]

Re: Intex Inflatable Spa - Pump Problems

only up to the limit of the meter - usually 10A

[budm]

Re: Intex Inflatable Spa - Pump Problems

Can we see the pictures of this replacement DC pump?

[mmartell]

Re: Intex Inflatable Spa - Pump Problems

Sorry bud I took pics but they need to be resized so let me figure that out first.

[mmartell]

Re: Intex Inflatable Spa - Pump Problems

Here you are bud - not much to see really.

[budm]

Re: Intex Inflatable Spa - Pump Problems

G-EAST
Shenzhen Chenzhou Electrical Appliance Co
CP50 series
CP50-1230A: 12VDC 2.2A

BTW, pictures always help.

DC Brushless Pump CP50 series g-east
● 12V～24V DC
● Long life, ideal life for 10000 hours
● Durable magnetic rotor and ceramics shaft
● Low or no maintenance
● Submersible or the diving installation
● Low power consumption
● Lift up to 7M
● Flow rate up to 2600L/H;
● Weight:385g
● 0~5V Speed control I wonder if it has this function.
How many wires does it have?

[goontron]

Re: Intex Inflatable Spa - Pump Problems

12 - 24v

Great, so slap together a bridge and have a working spa, OP.

[stj]

Re: Intex Inflatable Spa - Pump Problems

12 - 24v

Great, so slap together a bridge and have a working spa, OP.

no, 12v only - 24v is a different model.

[goontron]

Re: Intex Inflatable Spa - Pump Problems

^ are you sure? The a tilde in the position it's used in the datasheet usually used for X to Y voltage...

[stj]

Re: Intex Inflatable Spa - Pump Problems

different model number