Central Boiler CLASSIC Owner's Manual page 29

All valves in the outdoor wood furnace system should
be opened before starting this procedure.
1. Connect a washing machine supply hose (a garden hose
with two female ends) to the pressurized domestic water
line. Run water into pail or other container until clear;
then connect to the outdoor system.
2. Close the valve on the hot (supply) line of the outdoor
wood furnace.
3. Open the two valves that allow the pressurized domestic
water to fill into the system (water will start entering
the furnace through the return line). Confirm that the
water lines are connected correctly by feeling the
water lines as indicated by the arrows. They should
immediately feel cold to the touch. If they don't
immediately feel cold but the other ones do, stop
filling the furnace as the water lines are reversed.
Continue filling the furnace after switching the return
and supply water lines.
4. Let the outdoor wood furnace fill for about five minutes.
5. Close the valve on the return line of the outdoor wood
furnace (both valves are now closed) while the water
is still entering the outdoor wood furnace.
6. Open the valve on the hot (supply) line of the outdoor
wood furnace.
Fig. 38
Section 3 - Furnace Installation
7. Fill for 5 minutes; then if more than one pump circuit
is present, close the valves and repeat the process for
each pump circuit. Once all pump circuits have been
backfilled with water, finish filling the outdoor wood
furnace until the water level reaches the FULL mark.
8. Close the two filling valves.
9. Open all valves on the outdoor wood furnace. This
will allow the water to circulate throughout the system
when the pump(s) are operating.
NOTE: The outdoor wood furnace can also be filled
through the vent in the top of the furnace and the
air can be bled out with bleeders.
CAUTION
Be sure the outdoor wood furnace is filled with
water before firing. Never fire the furnace with the
water level below the FULL mark.
Never drain water from the furnace with live coals
or fire in the furnace. If the furnace ever boils hard,
be sure to check the water level and restore to full
if necessary.
If water is added, the proper level of Corrosion
Inhibitor (p/n 165) must be maintained.
WARNING
Never leave the door open or ajar when
unattended. The fire cannot be controlled by the
draft opening when the door is open.
10. Turn on the circulation pump(s); then fire up the
outdoor wood furnace. When the water reaches the
operating temperature, finish filling the furnace to
the full level on the sight gauge; then close the sight-
gauge valve and disconnect the filling hose.
NOTE: When filling is completed, the sight-gauge
valve should be closed. The water will
automatically drain from the sight-gauge tube.
Remember, this type of valve requires only ¼ turn
open and close.
CAUTION
Do not force the water level check valve in the open
position, as it may damage the valve and cause
the valve to leak. This type of valve requires only
¼ turn to open and close.
Section
3
29