Installation and Operating Instructions
NCB
Built Like A Tank With Laser Precision
Page
15
of 29
F. Installation of Pex Pipe.
Try to keep the Pex pipe underground as it enters the house. A 5” hole in concrete
block is easily made for the I- Pex pipe. It should be sealed with a can of expanding
foam.
If the I-Pex pipe has to come above ground to come through the sill plate or attic it
should be
well insulated.
G. Filling Boiler with Water
.
Once your Pex Pipe is hooked up, simply turn on your fresh water valve and allow it to
fill until water runs out the overflow. After starting the pump and bleeding the heat
exchanger, top off the water again. Be sure to open the fresh water valve at least once
a week during heating season to keep the boiler topped off. Failure to do so may
result in overheating and circulating pump failure.
H. Plumbing Parts Needed.
1. The pump needs a 1” PEX CRIMP to1” MPT to screw into a flange that is supplied and
already mounted to the pump. The flange is a female 1" FPT. See the picture below to
help visualize this. It’s the brass fitting on the bottom of the pump.
2. Extra Pex fittings can be purchased from your local hardware or plumber.
The Pex Pipe connected to the bottom of the pump runs to the house and normally
runs to the heat exchanger installed in your furnace.
This will also be your supply line for your hydronic system. In either case, a brazed-
plate heat exchanger is often used between the two systems. See end of this section
for more information on hooking up a brazed-plate heat exchanger.
3. The pump comes already mounted directly to the boiler
without a shut-off valve
.
However, it is a good idea to install a shut-off valve above the pump so that if the
pump ever has to be changed, the water supply can be shut off so water doesn’t flow
out of the boiler during the repair.
Simply add a valve and a 1” pipe, threaded on both ends, as shown.
4. It is also a good idea to put
two
shut-off valves on the return lines. This helps bleed
the system of air and is a big help when troubleshooting.
Note:
For larger homes, 1-¼ pipe may be best for maximum BTU output. A 1-¼ pipe can
put out up to 37% more BTUs due to higher water flow,
with the same heat exchanger!
The fittings above would need to be changed to accommodate 1-¼ Pex.
HINT:
Label the water lines or connect them before back filling over pipe and lines
