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Quickly crack open the firebox door to see what the fire is doing. (Leaving the door open
any length of time will give you a blazing fire.)
If you have too hot a fire with the fan off, close the cover on the side of the fan a little
more. The water should never be boiling. If it is, the cover is open too far or there is a
downdraft problem.
If you still have a boiling problem or you are using too much water (and the cover is
completely sealed – page 22),
you can move the pump to the bottom of the furnace
(what is now the return line) and have the return line go to where the pump is
now.
STEAM inside furnace. Wet insulation, water dripping from inside roof:
99.9% of the time the hot water coil cover was not sealed with silicone!
TESTING a new furnace for water flow
This should be done when the furnace and heat exchanger are first installed so
that you will know that the water flow is like in
your
system, for future reference.
(Heat exchanger installation is on page 23.)
Perform these Steps on a new furnace:
1. After the furnace has been filled and running, separate the 2 valves shown above
at the Pex Pipe between them, after turning off both valves so that water won’t
drain out.
2. Insert the left plastic valve and pipe in a 5-gallon bucket. Open the valve. Turn on
the pump by turning on the furnace (raising the thermostat will do this, if
necessary).
3. Record the amount of time it takes to fill the 5-gallon bucket. If it is 45 seconds,
for example, write that figure down on the inside of the furnace with a permanent
magic marker, near the valve for future reference. Turn off the plastic valve.
4. Next, disconnect the Pex line at the pump output. Install a short piece of Pex
Pipe or washing machine hose about 4-6 feet long and insert the pipe/hose into a
bucket. Turn on the pump by turning on the furnace (raising the thermostat if
necessary).
5. Record the amount of time it takes to fill the 5-gallon bucket. If it is 35 seconds,
for example, write that figure down on the inside of the furnace, next to the pump
for future reference. Turn the pump off.
You can use the circuit breaker to turn the pump off and on if you have already raised
the thermostat high enough to make the pump come on.
