Placement of expasion tank on Caleffi Hydro-Separator

Rocky_3

except that this particular unit only has one tap at the bottom with a factory installed drain, for getting rid of any dirt in the system. I guess I could pull it out and put in a nipple and tee and build a spot for the expansion tank and drain.
Thanks again,
Rocky

Rocky_3

Anyone piped one of these up?

Am going to use a Caleffi 1-1/4 Hydro-Separator connected to a single boiler. Usually I put the expansion tank on the bottom of the Spirovent, but there will be no spiro on this set-up as the Caleffi has a built-in air elimination device. Should I put my boiler pump pumping away from the Hydro-Separtor back into the boiler (as you would if the boiler was tied into the system with closely spaced tee's), and have my expansion tank between the Hydro Sep and pump hanging off a tee?
Thanks,
Rocky

ALH_4

XT Location

Connecting the expansion tank where you described is correct.

Connecting the expansion tank to the bottom port of the Hydro Separator is the ideal location in the system in my opinion as long as you pump away from the Hydro Separator both on the boiler and system sides.

In my opinion, a separate port for the expansion tank should be incorporated, at least for the smaller models.

Brad White_172

I agree with Andrew

on the point about connecting to the low loss header (Hydro-Link Separator). By definition, is that not the ideal PONPC?

Paul Rohrs_4

Alternate Location

I also like utilizing the lower port for dirt separation, even with y-strainers we include.

Attached is a pdf of where I normally locate the Exp.tank. We have had no issues.

Regards,

PR

kal_2

i have only used 6 of the 4\" ones...

and always connected my feed/exp tanks to the bottom with a tee and a ball valve underneath so that i can purge dirt out

honeywell/sparco is going to be making these soon too, i have some input with them and am getting them to put sensor wells in the middle upper third - so that you can get a good reading to drive a multiple boiler control – right now, if you put the boiler sensor on the boiler side - when the boiler just turned off and not running it's pump, the sensor is reading the heat from the last run and the computer thinks that the boiler supply temp is hot enough and wont run the boilers, and if you put the sensor on the system side, the boiler loop goes way past the desired 180 when making hot water for the indirect - it's a real dilemma - you end up epoxying the sensor right onto the hydro isolator and biasing the target temp down to 170 for DHW setpoint – I you have a boiler like a Lochinvar knight – then you set the post purge pump run time longer than the controller’s cycle time, to lets say 10min – so that we keep the boiler water flowing under the sensor at least as long as the “off” cycle or until the water has come down in temp equal to the system side’s temp

Brad White_9

That is exactly

what I did at the LLH on my Susan's Vitodens. Works great, very steady pressure even though it is "between the systems".

Rocky_3

kal

I know what you mean. We have had to "fudge" the target temp lower on some of our installs just so we don't get that "overshoot" due to poor sensor location. Have often wondered how to place the sensor in the ideal location (inside the LLH) and it sounds like Honeywell might be on to something. Are you listening Caleffi?
Rocky

AlexG

HydroSep

Hi Kal

Could I send you a picture of our prototype version of the HydroSep? I would really appreciate any input you had. Thanks.

Alex - R&D
Watts Radiant

Moses

Caleffi Hydro-Separator

Here are some pictures of our installation of the Caleffi Hydro-Separator that Kal is referring to

Dave_4

yup.. i sent you mine and moses emails

mikeschreiner

Caleffi Hydro Separator

Rocky,

The smaller Caleffi hydro separators (1", 1-1/4" & 1-1/2")have always had a port in the mixing chamber for a temperature probe. Over the years, Caleffi has found this to be the best position for the probe. There was a short time where the product coming into the US did not have that port but it has been put back in. (see attached)

Some guys prefer to put the indirect and the sensor on the secondary side but that requires your controls to kick out the other secondary loads to prevent high temp to them when the indirect calls.


Thanks,
Mike Schreiner
Caleffi North America

Kal Row

alex..

it's been a while - and we havent heard from you
whats up
kalro@pobox.com

AlexG

HydroSep

Hi Kal
Did you get the pics I sent? Thanks.
Alex - R&D
Watts Radiant

TONY_22

Hall of fame

Whoever did the install here should be nominated to the "Copper Institutes Hall of fame" what a great looking install! Will it eventually be pipe covered? Almost a shame in this case!

Excellent soldering and alignment work kudos to the tradesmen!

Rich