Buffer tank Tstat

Wayco Wayne_2

for a buffer tank. Large differential required. I think Hot Rod recommended a surface stat from RTI. Does anyone have info on this or another recommendation? Thanks WW

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Empire_2

T-Stat

Not sure what you mean by a Buffer tank, but the "Johnson Controls" model A419 24 vac offers a 30 diff. with other options incorporated in a digital stat. 120/240 also availiable.

J Matthers_2

I have

a Ranco ETC two Stage setpoint range -30 to 220, dif adjustment 1-30 deg ETC-211000-000 120/240 or ETC-212100-000, 24 volt input.

newlove

buffertank control

had success useing HW L6006c1018 ( 30diff )through
a HW 7184.

hr

30° is about

as wide as I have found.

RTI had some with a range up to 100°! However the last 4 I bought only went to 20. Not sure what happeed to the wide delta T models??

Sure were nice for buffer tanks and condensing boilers

hot rod

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tombig

A419

The Penn-Johnson temp control that Empire mentioned is a nice, economical remote sensor unit with a lot of flexibility. I've used it for pump controlling, slab sensor control and others. Reposition the jumpers to open or close on rise or fall. Here's the specs. Sorry they were a little wrinkled out of the box.

Wayco Wayne_2

Thanks

I'm real interested in the Johnson A419. I've ordered one and it should be in on Monday. How big is the Sensor. Could it also be used as an aquastat. I'm questioning the size of the sensor. I have a Boiler that's short cycling because of a broken aquastat. I'd like to have the A419 on there so I could have the 30 degree differential and the time delay on make protection. There is a well that takes the 3/8 bulb of an aquastat. Is the sensor a similar size or do I have to get creative?

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Paul Rohrs

Tekmar 150

I have used a Tekmar 150 on several buffer tank jobs. I especially like the adjustable differential and lcd display of current tank temp. I just took extra precaution in mounting the 071 sensor in the 34 bulb well with insulation.

Regards,

PR

tombig

The sensor on 419

is about 1/4x2. It'll fit in a thermometor well I'd wager. With the wide diff. you might not need a time delay. Read carefully about positioning the jumpers. For a cut-in on temp rise (to pull in a pump??) jumper for cooling mode and sutract diff.

leo g_78

wayne, we use the A419

on all of indirect tanks now. very accurate and ecinomical (sp?), we also use it it for our high limits on the radiant side. can do cooling also.

leo g

hr

For an aquastat well

I've found the temperature gauge well usually fit thermistors. I use Trerice brand wells, they have two well diameter sizes.

I suspect any brand temperature well would work. I cut a piece of copper tube to slide in with the sensor to maintain good contact if the well is too big.

Here is a small diameter well, the larger gauge well is about 1/2" id.

hot rod

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