8
OM-TDB(C) (C,A) (CE) INTERNATIONAL
WATER TREATMENT
1. Obtain water treatment compound and a pH test kit from your authorized parts
distributor.
2. Fill a mixing container with the measured amount of water required. (See
table). Distilled water is recommended.
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
3. 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.
4. Measure the water treatment compound (One way to do this is to add the
compound from a measuring cup.)
5. 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 test strip color with the color chart provided in the pH test kit. If
you are color blind use an electroanalytical instrument to measure the pH level
or have a person who is not color blind read the test strip color level.
6. Record the exact amounts of water and treatment compound used. These amounts
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 “ON” and
heat knob 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 heating elements.
When the temperature of the steam jacket reaches the value corresponding to
the heat 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 controller senses that the kettle is cooling below the set point, the
control relay 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 (345 kPa, 3.45 bar) is generated in the
jacket, the safety valve will open and relieve the excess pressure.
If the jacket water level gets too low before the heating elements overheat, the high-
limit control will open and shut off power to the elements until the kettle cools.
Setting the power switch dial to “OFF” shuts down all control and heating circuits.
The kettle has the following safety features:
1. Low water cutoff relay that will remove power from control and contactors
until the jacket water level is corrected.
2. High limit pressure switch, set to open at about 46 psi (317 kPa, 3.17 bar)
and to shut down the heat until jacket pressure is decreased.
3. Pressure relief valve, which will release steam if jacket pressure exceeds 50 psi
(345 kPa, 3.45 bar).
4. Tilt switch, which shuts off all heat when the kettle is tilted.
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.
TROUBLESHOOTING
This unit is designed to operate smoothly and efficiently if properly maintained.
However, the following is a list of checks to make in the event of a problem.
Wiring diagrams are found at the end of this manual. When in doubt, turn unit
off and call for service at 888-994-7636. If an item on the check list is marked
with (X), it means that the work should be done by an Authorized Service Agent.
SYMPTOM
WHO
WHAT TO CHECK
Display not lit
(Advanced)
User
a. That power supply is on.
Authorized
Service Rep Only
b. Fuses, accessible by removing caps on the side of the
control box.
c. For loose or broken wires. X
d. Temperature controller functioning, by listening for a click
when the switch opens or closes and verifying LEDs on
back of board. X
e. Contactor functioning. X
PROB in display
(Advanced)
Authorized
Service Rep Only
a. For loose or broken wires or damaged/failed RTD probe. X
b. PCB board malfunction/failure
HI in display
(Advanced)
Authorized
Service Rep Only
a. For loose or broken wires or damaged/failed RTD probe. X
b. PCB board malfunction/failure
Kettle is hard
to tilt
Authorized
Service Rep Only
a. Gears for foreign materials, and lubrication. X
b. Gears for alignment. X
c. Worn gears or broken gears. X
Kettle will
not heat, and
heating indicator
will not come on
User
a. Electric power supply to the unit. (Check the circuit
breaker.)
b. Water level in jacket.
Authorized
Service Rep Only
c. Control circuit fuses. Replace a blown fuse only with a
fuse of the same AMP rating. X
d. For loose or broken wires. X
e. Tilt cut-off switch. X
f. That pressure switch is open. X
g. Operation of temperature control. X
h. Low water cutoff. X
Kettle will
not heat, but
heating indicator
comes on
Authorized
Service Rep Only
a. Temperature control calibration and offsets. X
b. Heater elements with ohmmeter for ground short or open
element. If element is defective, call service. X
Kettle continues
heating after
it reaches
the desired
temperature
User
a. Control knob setting.
Authorized
Service Rep Only
b. Temp control circuit for short. X
c. Temp control operation. The contacts should click when
the dial is rotated above and below the setting for the
temperature of the kettle. X
d. Contactor, to determine whether it is energized or stuck. X
Kettle stops
heating before
it reaches
the desired
temperature
User
a. Control knob setting.
Authorized
Service Rep Only
b. Temp control calibration and offsets. X
c. Temp control operation. The contacts should click when
the dial is rotated above and below the setting for the
temperature of the kettle. X
Kettle heats
slowly
User
a. For air in the jacket. See “Jacket Vacuum” in the
“Maintenance” section of this manual.
Authorized
Service Rep Only
b. Heater elements with ohmmeter for ground short or open
element. If an element is defective, call service. X
c. Voltage of main power source. X
Pressure Relief
Valve pops
User
a. For air in the jacket. See “Jacket Vacuum” in the
“Maintenance” section of this manual.
Authorized
Service Rep Only
b. Pressure switch setting. X
c. Temp control operation. The contacts should click when
the dial is rotated above and below the setting for the
temperature of the kettle. X
d. Pressure relief valve. If the valve pops at pressures below
49 PSI, replace it.
e. ontactor, to determine whether it is energized. X
Safety valve leaks
a small amount
of steam when
kettle is operating
User
a. For contamination that prevents seating of the valve. With
full pressure in the jacket, pull the leer all the way briefly to
blow the valve clean, then let the lever snap back to seat
the valve.
Authorized
Service Rep
Only
b. Safety valve for defects. Replace any defectuve valve
with an identical valve. X
