Bleeding a Heat Exchanger
With the pump running (turn the thermostat up to 90 F so that the pump comes on),
simply close the brass valve on the return line quickly, holding it for 3-4 seconds. Then
open the valve. Repeat the procedure at least 4 times.
If you’re unsure if all the air is getting out, you can separate the 2 valves (shown on
previous page) at the Pex Pipe between them, after turning off both valves so that water
won’t drain out.
Insert the left plastic valve and pipe in a 5-gallon bucket. Open the valve. Then simply
close the plastic valve on the return line quickly, holding it for 3-4 seconds. Then open
the valve. Repeat the procedure 4 times. That way you can see if bubbles are coming
out of the line.
Insufficient Air Flow through Plenum
You can attain up to 42% higher BTU outputs with higher CFM of air flow. If you need
more airflow, the pulleys (if used) can usually be changed on the fan and/or motor to
give a higher fan speed. If you can’t get enough heat, a slow fan may be an issue
Many furnaces have 2 or 3 speeds or variable speed fans, utilizing the high speed for
A/C, which can beneficial here. Please consult a furnace specialist about this.
How to prevent the water from freezing
As long as there is a fire, the water won’t freeze in the outdoor furnace.
The pipes that are underground won’t freeze it they are below the frost line, as the
ground temperature is 50 degree or more.
WIRING:
A switch can be added to turn off the fan
before loading. This will prevent smoke from blowin
your face.
An example is shown to left.
See instructions on Pages 30 or 31
A switch can be added to the pump as well,
in case you want to have it run 24/7 to
prevent freezing, while you are away. Or it can be
wired without the third (red) wire, to run 24/7.
Running water won’t readily freeze and it will pick
up heat from in the house to keep the water warm.
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