48
Fig. 67
3. Whenever the burn chamber is removed for
maintenance, or if there is a problem with the gas
ignition, clean the electrode using a coarse (i.e.,
denim) cloth rag. If there is excessive creosote or
deposits on the electrode that are difficult to remove,
oven cleaner may be used to soften the deposits.
Inspect for cracked insulation, damage or for any
loose components.
4. Make sure the connector on the end of the ignitor is
threaded on tightly.
5. When properly adjusted, the electrode will appear
in the end of the burner tube as it does in Fig. 68.
Fig. 68
Electrode
M250_ELECTRODE
WATER QUALITY AND MAINTENANCE
An important part of outdoor furnace maintenance
is controlling the quality of the water in the furnace.
Central Boiler supplies a pH test strip and a nitrite test
kit with each new outdoor 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 verified 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.
NOTE: Do not store the test kit where it will be
exposed to heat (e.g., on top of the water heater).
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 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 significantly 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 verified 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 LED display flashes
to indicate
that the water level is below the sensor; then add fresh
water until the water level indicator rod is above the
vent cap (Fig. 55). Circulate the water for 24 hours and
test the water again.
Testing Supply Water
Before filling the outdoor furnace with water, test a
sample of the supply water that will be used to fill the
outdoor furnace (softened water is recommended).
1. Collect a small sample of the water to be used to fill
the outdoor furnace in a clean container.
2. Dip the pH test strip from the test kit in the water
sample. Shake excess water off the test strip.
Compare the color of the test strip to the chart
provided to determine pH level.
Section 9 - Routine Maintenance
