Will 160 DEG F input be ok for this hydronic coil?

Bob Sweet

Out of curiosity, how are you planning on controlling the flow to the coil? That would be the only concern in regards to the flow requirements of the coil itself.

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Jeff_89

My brother who is mentaly handycapped has come to live with us. So he can have some independence, we have decided to build onto our 2 car garage and place a large addition above all three new bays (Bonus Room). I have heated my house with a 250,000 btu outside wood boiler for two years via a hydronic coil in the furnace, and the DHW with a "sidearm HX", off the waterheater.

I planned on heating and cooling the new apartment via a EMI split system unit that has a hydronic coil installed insted of the heat pump option with KW heat. I got a steal on it off a local supply house (overstock). The CHP EMI Unit has a 30,000 btu coil installed. (So the plate says on the unit!)

What I did not realize until installing it, was I will only have 150-160 deg F water supplying the coil. I have no way of tapping into the boiler supply (uptsream) before it enters my house furnace or side arm. To get the 180 F the manual says it requires, I would have to run a whole new under ground line around the entire house (LONG STORY WHY!!), but thats of course my last option.

My question is-- Does it matter if the input temp is an average of 160 deg F instead of 180 deg f??? Will it heat this room ok??

MORE INFO: The new bous room is very well isulated. R 28 in the 2X6 walls, and R 40 in the cieling. Anderson casments on the Gable ends and one skylight. The room is just under 500 SQ/ft. We live in southern Iowa.

Ray M

You should have NO problems. The 30k coil would heat 3 times the space.

Thanks

Ray M

Comfort Tech Corp

Brad White_150

Same thoughts

how would you control the heat output?

Personally, I would put the coil on it's own small circulator and circuit as a secondary zone and bleed in/inject primary HW to meet temperature. My thinking here is to use a 3-way valve to maintain a constant coil inlet or outlet temperature.

This will help even-out spikes by variation in primary water temperature.

And Good for You for taking care of your brother as you are.

Mark Hunt

And PLEASE keep in mind


that there will be living space above your garage now and combustion engines produce HUGE amounts of CO.

With your brother "right upstairs", DO NOT EVER idle your vehicles in the garage EVEN with the doors open.

I would also STRONGLY suggest a low level CO alarm for his apartment.

Mark H



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