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Section 1 - Furnace Installation
NOTE: Be sure to ll the outdoor furnace with
water of good quality (softened water, if possible).
See Water Quality and Maintenance section.
Use the following procedure to ll the outdoor furnace
with water and purge the air from the system. Be sure to
purge the air from each pump circuit from the outdoor
furnace. All valves in the outdoor furnace system should
be opened before starting this procedure.
1. Connect a hose with two female ends and a backow
preventer inline to the pressurized domestic water
line. Run water into a pail or other container until
clear; then connect to the system.
2. Close the valve on the hot supply line of the outdoor
furnace.
3. Open the two valves that allow the pressurized
domestic water to ll into the system (water will
start entering the outdoor furnace through the return
line).
4. Conrm the direction of the water ow through
the system by feeling the temperature along the
direction of the system ow at the water lines, heat
exchanger and return port on the outdoor furnace.
If the parts of the system in the opposite direction
are changing temperature, then the supply and return
lines are reversed and should be corrected.
5. Let the outdoor furnace ll through the return line
for about ve minutes.
6. Close the valve on the return line of the outdoor
furnace (both valves will now be closed) while the
water is still entering the outdoor furnace.
7. Open the valve on the hot supply line of the outdoor
furnace. Conrm the ow direction on the supply
side at the water-to-water heat exchanger and supply
port on the outdoor furnace.
8. 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 purged with water, continue lling the outdoor
furnace until the water level reaches one inch (2.5
cm) below the FULL mark on the sight gauge to
allow for expansion of water as it heats up.
9. Close the two lling valves.
10. Open all valves on the outdoor furnace and turn on
the circulation pump(s). This will allow the water
to circulate throughout the outdoor furnace system
when the pump(s) are operating.
NOTE: At this point, water should not be allowed
to circulate through the existing heating system.
11. Test all piping to the dual fuel burner for leaks and
repair as required. Purge all air from the piping.
12. Refer to Firing the Outdoor Furnace to start the
outdoor furnace. Cycle the furnace several times
to ensure proper operation. Do a functional test of
each control position on the four-position switch to
ensure proper operation.
CAUTION
Be sure the outdoor furnace is lled with water
before ring. Never re the outdoor furnace when
the water level is more than 1" (2.5 cm) below the
FULL mark on the sight gauge.
NOTE: The sight gauge valve should always be
closed except when checking water level. Water
will automatically drain from the sight gauge
tube. Remember that this type of valve requires
only 1/4 turn to open or close.
13. Check the system for leaks again. Inspect all
ttings and hose ends for any signs of leakage; repair
as necessary. It may be possible to stop a very slow
leak at a hose clamp by tightening the clamp after
the system has warmed up and the poly becomes
more pliable. It might also be necessary to install a
second hose clamp with the screw positioned on the
opposite side. Release the pressure upon completion
of the test.
NOTE: It should not be necessary to add water
to the outdoor furnace more frequently than
once every twelve months. If it is more frequent,
either there is a leak in the system or the outdoor
furnace is boiling because of improper operation
or maintenance (see Troubleshooting Section).
Be sure to locate and repair the problem
immediately. Frequently adding water can cause
deterioration in the water jacket. Each time water
is added, refer to Water Quality and Maintenance
for water testing procedures. If indicated by
test results, add Corrosion Inhibitor Plus™ as
required. Deterioration due to improper operation
and/or maintenance is not covered by warranty.
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