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Section 3 - Routine Maintenance
3-7. Completely Remove Ash
1. Remove all ashes from the rebox.
CAUTION
Always wear the appropriate personal protective
gear when cleaning ashes from the rebox.
2. Use a wire brush and small scraper to clean the
rebox, side walls, back wall and ash pan. Use a
light to inspect for corrosion. If corrosion is present,
contact your dealer. Lubricate the solenoid plunger
with a light petroleum distillate (e.g., WD-40 or
equivalent).
2. Disposal of ashes - Place ashes in a metal container
with a tight-tting metal lid. It can take many days
before the ashes are completely cooled. Other waste
should not be placed in this container.
3. Each time the ashes are cleaned out, inspect the
door rope (see Section 3-5) to make sure it is sealing
properly.
WARNING
When cleaning the outdoor furnace, be careful not
to spill any hot ash outside of the noncombustible
container.
3-8. Scrape Bottom of Firebox
Scrape the bottom 12 inches of the rebox clean. Allow
the re to get very low; then move the coals to one side
of the rebox.
Use a hoe to clean the other side. Move the coals to the
other side and nish cleaning the rebox, leaving some
ashes with the live coals. Pull the coals and ashes to the
draft area (front and center of the rebox). When the
furnace is lled, the coals remaining in the rebox will
light the re.
NOTE: Regular cleaning of the rebox, particularly
at the ash line and below, reduces the possibility
of corrosion.
The top of the rebox and walls of the rebox above
the ash line should be scraped clean if large, thick, dry
or crusty deposits are present. A thin, tar-like layer of
creosote does not cause any problems in the operation
of the furnace.
3-9. Door Handle
Lubricate the door handle with a light petroleum
distillate (e.g., WD-40 or equivalent).
WATER QUALITY AND MAINTENANCE
An important part of furnace maintenance is controlling
the quality of the water in the furnace. Central Boiler
supplies a pH tape and a nitrite test kit with each new
furnace.
Water Test Kits and Test Results
It is very important to keep record of water test results
(include the date, pH and nitrite level). If subsequent
water tests indicate a pH that is too low and/or a nitrite
level that is too high, the results should be veried using
a new test kit.
The pH test strips and Permanganate Reagent each have
a varying shelf life that can affect their accuracy. Test
kits should be stored in a dry area at room temperature
to obtain maximum accuracy over a longer period of
time. The area in the access panel door where the test kit
is located upon arrival from the factory is intended for
shipping purposes only. The kit should be moved to an
area as stated above as soon as possible after delivery.
The pH of the water in the outdoor furnace will not
decrease unless fresh water is added to the furnace. The
nitrite level of the water in the outdoor furnace will not
increase unless Corrosion Inhibitor Plus™ is added.
For example, if a water test in the fall of the year indicates
a pH of 8.5 and a nitrite level of 20 drops by nitrite test
(2000 ppm) and no water or Corrosion Inhibitor Plus™
is added, a water test the following spring must indicate
a pH of at least 8.5 and a nitrite level of no more than 20
drops by nitrite test (or slightly less, due to evaporation).
If the test indicates a signicantly lower pH level or
higher nitrite level, perform another test with a new test
kit to verify the results. If the results are +10% different
using a new test kit, either water or Corrosion Inhibitor
Plus™ has been added to the system.
If a test is conducted and veried that indicates a high
pH (above 9.5) and/or nitrite level (above 30 drops),
DO NOT ADD MORE CORROSION INHIBITOR
PLUS™. Adding Corrosion Inhibitor Plus™ increases
nitrite and pH levels. The outdoor furnace should be
drained until the water in the sight gauge reaches the
bottom of the sight gauge; then add fresh water until
it is 1 inch below the FULL mark on the sight gauge.
Circulate the water for 24 hours and test the water again.
Testing Supply Water
Before lling the outdoor furnace with water, test a
sample of the supply water that will be used to ll the
outdoor furnace (softened water is recommended).
1. Collect a small sample of the water to be used to ll
the outdoor furnace in a clean container.
2. Dip the pH test strip from the test kit in the water.
Shake excess water off the test strip. Compare
the color of the test strip to the chart provided to
determine pH level.
3. If the pH level is between 6.5 and 8 and there are
no other known water quality problems, then the
outdoor furnace may be lled with this water.
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