OM-TDB/TDBC-CE 13
Maintenance
WARNING
BEFORE REPLACING ANY PARTS,
DISCONNECT THE UNIT FROM THE ELECTRIC
POWER SUPPLY.
b. When the pressure/vacuum gauge reaches a positive pressure reading of
5 PSI (0.35 Bar/34.5 kPa), release the trapped air and steam by pulling up
on the safety valve for about 1 second. Repeat this step, then let the chain
snap back into the closed position.
3. Jacket Filling and Water Treatment
The jacket was charged at the factory with the proper amount of treated distilled
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.
TO FILL JACKET WITH WATER:
a. If you are replacing water lost as steam, use distilled water. If you are
replacing treated water that ran out of the jacket, prepare more treated
water as directed in step 3, “Water Treatment Procedure”.
b. Remove fill plug with open-end wrench or crescent wrench.
c Open shutoff valve (turn handle 90° on ball valve).
d. Use a funnel and add water to jacket.
e Check water level in jacket, by viewing water level indicator glass.
f. Continue to add water until the water level indicator glass is 3/4 full.
g Close shutoff valve, and install fill plug. Follow procedure in “Jacket
Vacuum” to remove air from kettle jacket.
4. Water Treatment Procedure
a. Obtain water treatment compound and a PH test kit from your authorized
Groen parts distributor.
b. Fill the mixing container with the measured amount of water required. (See
the table at right). Use distilled water.
c. Hang a strip of pH test paper on the rim of the container, with about 25 mm
of the strip below the surface of the water.
d. Measure the water treatment compound you will be using. (One way to do
this is to add the compound from a measuring cup.)
e. 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.
f. 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. For optimum
performance, use correctly treated, distilled water.
5. Component Replacement
Wiring is marked as shown on the schematic drawings. Be sure new
components are wired in the same manner as the old.
Model
Jacket Capacity
TDB(C)-20, -24
3.8 Liters
TDB(C)-40, -48
4.7 Liters
WARNING
TO AVOID INJURY, READ AND FOLLOW ALL
PRECAUTIONS STATED ON THE LABEL OF
THE WATER TREATMENT COMPOUND.
IMPORTANT
PRESSURE GAUGE MUST READ 0 PSI (0 BAR/0
KPA) OR LESS BEFORE YOU FILL JACKET WITH
WATER.
