I. Inspect the firebox for signs of corrosion every 3
months during the first year and every 6 months
thereafter.
2. Clean firebox walls and the front and back corners;
then inspect the firebox. If excessive corrosion is
visible, review your maintenance procedures and
monitor quarterly (see Maintenance Schedule).
3. Periodically, lubricate the door handle with a light
petroleum distillate (WDAO 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.
Testing Supply Water
Before filling the furnace with water, test a sample of
the supply water that will be used to fill it (softened
water is best, if possible).
1. Collect a small sample of the water to be used to fill
the furnace in a clean container.
2. Dip the pH indicator tape from the test kit in the
water. Shake excess water off the paper. Compare
the color of the tape to the chart provided with the
test paper 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
furnace may be filled with this water.
4. If the water to be used to fill the furnace has a pH
level of less than 6.5 or greater than 8, a sample of
the water should be sent to a water quality test lab
for recommended treatment, the water should be
conditioned, or water should be supplied from a
different source.
Corrosion Inhibitor Plus and Initial Treatment
Central Boiler Corrosion Inhibitor Plus (pin 1650) gives
optimum protection when the water is initially treated to
a nitrite level of 20 drops of permanganate reagent.
The recommended initial treatment rate for the furnace
is specified by units. One unit of the Corrosion Inhibitor
Plus is a l-gallon container. The normal rate for the initial
treatment is dependent on the model: CL 4030, CL
5036 and SCL 5036 - 1 unit; CL 6048 and SCL 6048-
2 units.
NOTE: If the system has a larger than normal
water capacity, more Corrosion Inhibitor Plus
should be added at a recommended rate of one
unit per 180 gallons of water.
Section 3 - Maintenance Instructions
I. Add the recommended amount of Corrosion
Inhibitor Plus through the vent pipe at the top of the
furnace.
2. Immediately fill the furnace to the FULL level mark
on the sight gauge.
3. Start the pump(s) and circulate water for 24 hours.
4. See Obtaining System Water Sample for
instructions on collecting a test sample.
5. Use Test Kit (pin 405) when no antifreeze is present
in the water. Use Test Kit (pin 597) when antifreeze
has been added to the water.
6. Remove and dip one strip of pH paper into the water
sample. Shake excess water off the paper. Compare
the paper color to the color chart in the kit. The pH
of the water should now be between 8.0 and 9.5.
7. Rinse and fill the sample tube to the 25 mL mark
with treated water from the furnace.
8. Add 25 drops of Sulfuric Acid (pin 404) to the water
sample and swirl to mix.
CAUTION
Sulfuric Acid is a corrosive acid. Handle
carefully.
9. Using the dropper, add Permanganate Reagent (pin
403) one drop at a time, swirling the water and
counting each drop, until the color changes from
colorless to a faint pink that persists for at least one
minute.
NOTE: Always hold the dropper in a vertical
position to ensure proper droplet size.
10. If the nitrite level is not at least 20 drops by nitrite
test, add 112 unit of Corrosion Inhibitor Plus (pin
1650); then circulate water for 24 hours and repeat
procedure, as needed, to achieve a nitrite level of at
least 20 drops by nitrite test.
11. Do not exceed treatment of higher than 30 drops by
the nitrite test. If the test requires more than 30
drops, dilute the water by draining water from the
system until the water level just reaches the bottom
of the sight gauge and then perform steps 2-12.
CAUTION
Before draining water from the system, make
sure the firebox is not hot.
12. After the proper nitrite level has been obtained,
check pH to make sure it is between 8 and 9.5.
After the initial treatment, maintain the nitrite level
between 15-20 drops by the nitrite test. One drop of permanganate
reagent equals approximately 100 ppm.
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