Troubleshooting; Sequence Of Operation; Replacement Parts - Groen TDB-20 Operator's Manual

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
TDB/TDBC-20 20 qt (5 gal), 18.9 liter
TDB/TDBC-24 24 qt (6 gal), 22.7 liter
TDB/TDBC-40 40 qt (10 gal), 37.8 liter
TDB/TDBC-48 48 qt (12 gal), 45.4 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.
8 OM-TDB(C) (C,A) (CE) INTERNATIONAL
Kettle Capacity Jacket Capacity
7 quart, 6.6 liter
7 quart, 6.6 liter
9 quart, 8.5 liter
9 quart, 8.5 liter
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
Display not lit User a. That power supply is on.
(Advanced)
Authorized b. Fuses, accessible by removing caps on the side of the
Service Rep Only 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 Authorized a. For loose or broken wires or damaged/failed RTD probe. X
Service Rep Only b. PCB board malfunction/failure
(Advanced)
HI in display Authorized a. For loose or broken wires or damaged/failed RTD probe. X
Service Rep Only b. PCB board malfunction/failure
(Advanced)
Kettle is hard Authorized a. Gears for foreign materials, and lubrication. X
to tilt Service Rep Only b. Gears for alignment. X
c. Worn gears or broken gears. X
Kettle will User a. Electric power supply to the unit. (Check the circuit
not heat, and breaker.)
heating indicator b. Water level in jacket.
will not come on
Authorized c. Control circuit fuses. Replace a blown fuse only with a
Service Rep Only 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 Authorized a. Temperature control calibration and offsets. X
not heat, but Service Rep Only b. Heater elements with ohmmeter for ground short or open
heating indicator element. If element is defective, call service. X
comes on
Kettle continues User a. Control knob setting.
heating after
it reaches
Authorized b. Temp control circuit for short. X
the desired
Service Rep Only c. Temp control operation. The contacts should click when
temperature
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 User a. Control knob setting.
heating before
it reaches
Authorized b. Temp control calibration and offsets. X
the desired
Service Rep Only c. Temp control operation. The contacts should click when
temperature
the dial is rotated above and below the setting for the
temperature of the kettle. X
Kettle heats User a. For air in the jacket. See "Jacket Vacuum" in the
slowly "Maintenance" section of this manual.
Authorized b. Heater elements with ohmmeter for ground short or open
Service Rep Only element. If an element is defective, call service. X
c. Voltage of main power source. X
Pressure Relief User a. For air in the jacket. See "Jacket Vacuum" in the
Valve pops "Maintenance" section of this manual.
Authorized b. Pressure switch setting. X
Service Rep Only 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 User a. For contamination that prevents seating of the valve. With
a small amount full pressure in the jacket, pull the leer all the way briefly to
of steam when blow the valve clean, then let the lever snap back to seat
kettle is operating the valve.
Authorized b. Safety valve for defects. Replace any defectuve valve
Service Rep with an identical valve. X
Only
WHAT TO CHECK