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Old 09-28-2021, 06:19 PM   #1
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hydronic heated floor x45 diesel

hey all and thank you in advance for your help!
i have a 06 bluebird cat7 and we have an external x45 proheat diesel heater. were using it to run a hydronic system. one loop for heated floor, one for heat transfer for hot water and one radiator. my questions

Is there a way to lower temperature in diesel heater, right now its set for shot off 185Fdegrees back on 150F. way to hot for my pex flooring.

if temperature is left alone can it be regulated with a globe valve which controls water flow?

also is a xtra flow tank/expansion tank needed? if so how big?

thanks again andy

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Old 09-28-2021, 06:35 PM   #2
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This video will help a lot.

https://youtu.be/OSJkjcTHVLE
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Old 09-28-2021, 06:45 PM   #3
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it looks like the Proheat is hard set at those temp ranges.. I dont see a method for changing it.. the Proheat units perform a similar function to the chinese diesel heaters in that they heat the coolant, these operate in a totally different way from a webasto or the chinese heaters.. form what ive seen thse units operate much more efficiently in terms of fuel usage.. but they lack the ability to ramp up and down like the webasto units do..



somewhereinusa camn best answer tyour hydronic floors concerns as he has a really nice setup in his bus..
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Old 09-28-2021, 06:56 PM   #4
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Quote:
Originally Posted by cadillackid View Post
it looks like the Proheat is hard set at those temp ranges.. I dont see a method for changing it.. the Proheat units perform a similar function to the chinese diesel heaters in that they heat the coolant, these operate in a totally different way from a webasto or the chinese heaters.. form what ive seen thse units operate much more efficiently in terms of fuel usage.. but they lack the ability to ramp up and down like the webasto units do..



somewhereinusa camn best answer tyour hydronic floors concerns as he has a really nice setup in his bus..

Shortcut to watching the video: if you put a diverting valve in the radiant circuit itíll recycle the cooler water until it needs additional heat and only take new heated water when itís cooler than the valve setting. Seems easy to implement.
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Old 09-29-2021, 07:42 AM   #5
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the thing about this is i only have one circulator. that means i need to regulate temperature and flow in only and not recirculate. 1 way in and one way out.
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Old 09-29-2021, 07:49 AM   #6
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You may be well served to add one to the radiant loop. Not sure how much energy they draw but a little pulp just to keep that water moving shouldnít be a big deal. Maybe a solar hot water pump of small size? Iím no expert in this area at all though, you definitely should dig into this more, Iím just guessing that you need one. With that valve in the video itís possible you donít too.
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Old 09-29-2021, 10:29 AM   #7
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for Home HVAC we always spec's diverter valves and a circulator per zone.. the little Davies Craig pumps I use only pull about 1.4 amps a piece on full power.. never tried running them at low voltage to see if they will work and pull less.. the reason for a circulator within the zone is the mixing valve is temp controlled so it will monitor the loop temp and only open up the supply when its necessary to add heat to the loop.. they usually open up very slowly to give the mix water a chance to circulate through the loop.. when your zone is satisfied you can shut off the circulator within the zone and closew the zone valve fully..


thats how its done in Home hydronics.. the boiler heats the water to the temperature required for coil type radiants and fan-coils..
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Old 10-06-2021, 02:21 PM   #8
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Quote:
Originally Posted by cadillackid View Post
for Home HVAC we always spec's diverter valves and a circulator per zone.. the little Davies Craig pumps I use only pull about 1.4 amps a piece on full power.. never tried running them at low voltage to see if they will work and pull less.. the reason for a circulator within the zone is the mixing valve is temp controlled so it will monitor the loop temp and only open up the supply when its necessary to add heat to the loop.. they usually open up very slowly to give the mix water a chance to circulate through the loop.. when your zone is satisfied you can shut off the circulator within the zone and closew the zone valve fully..


thats how its done in Home hydronics.. the boiler heats the water to the temperature required for coil type radiants and fan-coils..
whats a good brand or website for diverter valve?
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