air handler to boiler distance

Brian Maffioli

I am using 3/4" pex to the unit and I always dedicate a circ. to each zone. we probably will be filling system with anti freeze. About half of the total length will be in the basement, 1/4 will be inside an interrior wall and the last 1/4 will be in the attic with the unit.
just yesterday though I spoke to one of my sales guys and he recomended a Taco hydro air fan control (HAFC101) with an aquastat on the unit. Does this sound like it would work?

Brian Maffioli

air handler to boiler distance

I am currently roughing a new home and I am concerned about the distance from the boiler to the air handler, both are at total opposite ends of the house. I would estimate total developed length of pipe going one way is at least 120 ft.
I am worried about heat loss and the water being to cold going back to the boiler. I guess I could always do a bypass so the boiler doesent get shocked, I am more worried about having a cold coil.

Any advice?

Brad White_9

I would

insulate the bejeezus out of the piping run, first off.

Secondly, I would install a circulator in this coil piping, assuming it is dedicated to just the coil.

The control strategy I would use is constant circulation in this loop to the coil whenever the AHU is in heating mode. A modulating 3-way control valve would bleed in water to the coil or bypass to the return. This control valve would work off of a space thermostat or discharge thermostat, whatever controls the AHU heating.

This way, your hot water is always near the coil and the valve modulating open would introduce hot water rapidly to the coil with little time lag.

One way of doing it, I am sure there are others.

Rely_2

Things we need to know

1- what is the btu load of the space being heated
2-lenght of run to the AHU from boiler
3-delta t of the coil design

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hr

Also

the temperature of the space in which that piping will travel through.

If it's pex traveling through heated space at low flow rates, the loss isn't all that big. Send that info and I can plug it into the HDS pipe loss program. BTU's moved (flow rate) fluid type, and air space temperature around pipe. And pipe material, of course.

hot rod

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brucewo1b

HAFC201 Model

HAFC201 Model has an aquastat connector for freeze protection

Don't think the 101 does but give some thought to what you will need if the power goes out