9 OM-TDB (C,A,C2T™) & TDBC (C,A,C2T™) Domestic
JACKET FILLING
Every day, before you turn on the unit, make sure the water level is approximately
in the center of the water gauge glass. The jacket was filled at the factory with the
proper amount of treated water, and is airtight, but over time steam may be vented
and water lost.
From time to time, you may need to restore the water to its proper level. The
procedure for adding water follows.
1. If you are replacing water lost as steam, use distilled water. Do not use tap
water. If you are replacing treated water that was drained from the jacket,
prepare more treated water as directed below.
2. Allow the kettle to cool completely. Remove the pipe plug from the jacket fill
assembly. Pour in the distilled or treated water. Using a funnel will help you
in this process. Hold the pressure relief valve open while you pour, to let air
escape from the jacket. Continue adding water until the water level rises to the
center of the round sight glass.
3. Air that gets into the jacket during the filling operation must be removed,
because it will make heating less efficient. Follow the procedure in Jacket
Vacuum/Removing Air From Jacket above, to restore a negative pressure
reading.
WATER TREATMENT
1. Fill a mixing container with the amount of water required. Use only distilled
water.
Model Kettle Capacity Jacket Capacity
TDB/TDBC-20 20 qt (5 gal), 18.9 liter 7 quart, 6.6 liter
TDB/TDBC-24 24 qt (6 gal), 22.7 liter 7 quart, 6.6 liter
TDB/TDBC-40 40 qt (10 gal), 37.8 liter 9 quart, 8.5 liter
TDB/TDBC-48 48 qt (12 gal), 45.4 liter 9 quart, 8.5 liter
2. 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.
3. Stir the water continuously, while you slowly add water treatment compound
until a color between indicating a pH of 10.5 and 11.5 is reached. (Shown on
the pH test kit chart.) Judge the pH by frequently comparing the test strip with
the color chart provided in the pH test kit. If there is a problem distinguishing
color, use a pH meter.
4. Use a measuring cup to add the compound so that you may record the exact
amount used.
5. The amount may be used again, if the same water sources and compound are
used in the future. However, it is best to check the pH each time treated water
is prepared.
SEQUENCE OF OPERATION
The following “action-reaction” outline is provided to help understand how the
kettle works.
When the operator starts up the kettle by turning the power switch to “ON” and
temperature dial from “OFF” to a desired setting, the control relay closes. This
lights up the heating indicator light and causes the contactors to close, allowing
power to flow to the heating elements. When the temperature of the steam jacket
reaches the value corresponding to the dial setting, the control relay opens. This
turns off the heating indicator light and causes the contactors to open, stopping
the power to the heaters. As soon as the control senses that the kettle is cooling
below the set point, the switch closes, the heating indicator light comes on,
the contactors close, and the heaters come on again. On-off cycling continues,
keeping the kettle at the set temperature. This is why the heating indicator light
cycles on and off during normal operation. Every time the kettle is tilted, the tilt
cut-off switch interrupts the power supply to the heaters, so that the heating
elements will not operate while not submerged in the jacket water.
If steam pressure greater than 50 PSI is generated in the jacket, the pressure
relief valve will open and relieve the excess pressure.
In the event that the jacket water level gets too low and the heating elements
overheat, the high limit control will open and shut off power to the elements until
the kettle cools. Setting the operating power switch to “OFF” shuts down all
control and heating circuits.
REPLACEMENT PARTS
To order parts, contact your Authorized Service Agent. Supply the model
designation, serial number, part description, part number, quantity, and when
applicable, voltage and phase.
CONTACT US
If you have questions pertaining to the content in this manual, contact Unified
Brands at 888-994-7636.
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