On 6 Jun 2006 09:55:01 -0700, wrote:

Ignoramus8339 wrote:
On Tue, 06 Jun 2006 10:43:11 GMT, Mys Terry wrote:
On Tue, 06 Jun 2006 02:21:13 GMT, Ignoramus11409
wrote:

I have an old 120v spa. It had trouble previously, which I fixed by
replacing GFCI outlet a couple of years ago.

It developed a new problem, which is t hat it does not heat water.

The pump, the timer etc, all work, but the water stays lukewarm (we
have warm days). I set thermostat to the highest position, but it does
not help. I am a reasonably electrically handy person (plz do not
suggest to "hire a pro", at least yet), but I would like to know what
typically goes wrong.

thanks

i

Could be the heating element.

Beacuse the heating element can be easily damaged in a matter of seconds by a
lack of water flowing over it, most spas have a flow sensor that detects of the
water is not circulating properly. This sensor will keep the heater element off
if it detects little or no water flow. Could be as simple as cleaning the
filters.




Thanks. I will drain the pool, check the filters and will also check
the heater with an ohmmeter.

If the heater is bad, and if there is enough room for a 220V heater
(as opposed to a 115V heater that I have), perhaps I can put a 220V
circuit to the spa and rewire it to use 220V heating. The issue that
must be resolved before it is whether the flow of water from my
current pump is enough to keep the 220V heater cool.

i

I'm sure the water flow on the circulation setting is adequate if you
did switch from 120V to 240V for the heater. It will heat 4X as fast,
but that still amounts to a very small temp delta of the water flowing
through the heater. The water coming out is barely noticeable as
being warmer than the water going in.

That is overwhelmingly likely to be the case.

However, I don't think I would fool around with trying to rig up the
heater to work at 240V That typically would require going into the
power pack, running 240V to the relay (assuming it's rated for that),
etc. Unless you're 100% sure of what you're doing, you could create a
lethal hazhard. It may be possible to get a whole new power pack for
the spa that is designed for 240V.

Well, surely it is important to either do it right, or not do it at
all.

I could add a GFCI 20A circuit for 240V, and use the 120V output from
my control (that used to feed the heater) to be the input to a
appropriately rated contactor, that would switch 240V.

The only issue with this is that instead of one breaker going to the
spa, there will be two (120V and 240V). So an unsuspecting person may
think that by disconnecting one of the breakers, the spa is no longer
powered, which would not be the case.

i