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JimT[_2_]

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On Wed, 3 Nov 2010 16:13:21 -0700 (PDT), wrote:

On Nov 3, 5:38 pm, "JimT" wrote:
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...

On Wed, 3 Nov 2010 13:27:42 -0500, "JimT" wrote:

Oh yeah and no doubt. The fact is, a pool heater that is heating
should
not
be just "shut down". Those sensors are for problems like power
interruptions
and pump failures. I don't think the mfg of Raypak want their heaters
to
fry
circuit boards on shut down but you should let your pool heater run
for
awhile anyway, after it's been heating, to let the pool water cool
down
the
heater. I don't have a problem "going manual."

I just officially claimed pool season is over. I can turn the heater
off
and
put my pump "off timers" back on. I'm thinking I'll cycle the pool for
about
4 hours a day.

Jim

The instructions for your pool heater will say you should be using a 2
stage timer that lets the pump run a few minutes after the heater goes
off.

No such instuctions for the Jandy here. As soon as the pump cuts off,
the heater goes off. Nor does it have any capability of doing that
even if I wanted to. The water flowing through it keeps the thing
cool while it's fired up. The water leaving this 400K BTU heater is
only 7 deg F warmer than it comes in. Any residual heat that results
when the pump and heater shut off at the same time may warm the water
a bit, but not anywhere near hot enough to be concerned about.

This is from page 20 of the Sta-rite gas heater installation book.

"The filter pump should run continuously when the
heater is on, and for at least 15 minutes after the
heater is off."

The instructions on my Raypak talks about the dual timer:

"To operate the heater with a time clock, connect the
timer to the fireman's switch connection in the heater's
wiring. The time clock should be of the dual switch
type and set to shut off the call for heat to the pool
heater 15 to 20 minutes prior to shutting down the pool
pump."

Jim