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[Corneroffice]

Honeywell strap on 6006C-1018

I used this aquastat on my heater in the garage (modine type) the strap on is nice and easy to install. the issue I have is the pex lines take 4-5 minutes to warm up enough to satisfy the aquastat on start up. then on shut down when the pipe needs to cool to shut the fan off, I have 180 degree water sitting in the pipe and it take 8-10 min to cycle off.
I have messed around with the temp controller on the aqustat and Ive concluded its just how its going to be.  and its all good.

An aquastat that is sensing the water  and not the pipe is going to respond much more quickly.

[Corneroffice]

so after a week + of running the unit I think I need more BTU's out of the boiler.

I currently have 2 - 009's inline from the boiler to the house. 120' with approx 10' of head.

I have my DHW going through a plate exchanger (60 plate), hot air via a heat exchanger (20x20,4, approx 140kBTU) in the plenum and a modine (approx 40k BTU) type heater in the garage.
when all 3 zones are open, the fan in my boiler short cycles, when only the zone for the plenum is open the fan does not short cycle.
I have messed with the temp on the aquastat on the heat exchanger (in the plenum) and got it to run without cycling but the air temp drops too low after 5 min or so.

my conclusion is I need more volume (GPM's) to increase the BTU's coming to the house.
I was looking at the 0013 and according to the performance chart and I will be getting about 30 GPM's at 10' of head.
anyone been down this road?

[Big Wood]

I run 0014 and 0013 on my boilers you have close to 400 gals of water in that boiler and you want to move it in and back quickly that will help on your return temps

[Corneroffice]

Installed the 0013 over the weekend and looks like the system is performing a bit better. Still having short cycle issues with my fan but its much improved.
going to add a check valve on the return side to the boiler. Mechanical guy thinks with zone 3 pumps on pushing water to the return, they are over powering the 0013 and not allowing water back to the boiler to reheat. by adding a check between the supply and return loop the 3 zone pumps will not be able to interfere with the 0013 loop.
I will post results when we get her done.