Groen TDB/6 Operator's And Service Manual page 13

3. Jacket Filling and Water Treatment
The jacket was charged at the factory with
the proper amount of treated water. You may
need to restore the water to its proper level,
either because water was lost as steam
during venting or because treated water was
lost by draining.
If you are replacing water lost as steam,
a.
use distilled water. If you are replacing
treated water that ran out of the jacket,
prepare more treated water as directed
in step 4, "Water Treatment Procedure."
b. Allow the kettle to cool completely. Turn
the elbow on the safety valve
counterclockwise (to avoid thread
damage) until the opening of the elbow
faces upward.
c. Open the safety valve and pour the water
or treated water in at the elbow until the
water level rises to a point between the
marks on the gauge glass.
CAUTION
BEFORE YOU HEAT THE KETTLE FOR ANY
PURPOSE, TURN THE ELBOW CLOCKWISE
UNT IL T HE OPENING
DOWNWARD.
d. Air introduced to the jacket during the
filling operation must be removed to
obtain efficient heating. See "Jacket
Vacuum" on page 12.
4. Water Treatment Procedure
WARNING
TO AVOID INJURY, READ AND FOLLOW
ALL PRECAUTIONS
LABEL OF T HE WAT ER TREATMENT
COMPOUND.
a. Place one quart of water in the mixing
container. Distilled water is
recommended.
b. Hang a strip of pH test paper on the rim
of the container, with about 1 inch of the
strip below the surface of the water.
AGAIN FACES
ST AT ED ON T HE
c. Measure the water treatment compound
you will be using. (One way to do this is
to add the compound from a measuring
cup.)
d. Stir the water continuously, while you
slowly add water treatment compound,
until the water reaches a pH between
10.5 and 11.5. Judge the pH by
frequently comparing the color of the test
strip with the color chart provided in the
pH test kit. Color blind people mixing the
treated water solution must use an
electroanalytical instrument to measure
the pH level or have a person who is not
color blind read the test strip color level.
e. Record the exact amounts of water and
treatment compound used. These
amounts may be used again, if the same
sources of water and compound are
employed to refill the jacket in the future.
However, it is advisable to check the pH
every time treated water is prepared.
5. Component Replacement
WARNING
B E F O RE RE P L AC IN G
DISCONNEC T T HE
ELECTRIC POWER SUPPLY.
Internal wiring is marked as shown on the
circuit schematic drawings. Be sure that new
components are wired in the same manner as
the old components.
13
OM-TDB/6
A N Y P ART S ,
UNIT FROM T HE