6 OM-EE
SEQUENCE OF OPERATION
The following “action-reaction” outline is provided to help the user understand
how the equipment works.
When the operator starts up the kettle by turning the operating thermostat dial
from “OFF” to a desired setting, the thermostat switch 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 dial setting, the thermostat switch opens. This turns off the heating indicator
light and causes the contactors to open, cutting the power to the heaters.
As soon as the thermostat senses that the kettle is cooling below the set point,
the thermostat 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.
If steam pressure greater than 30 PSI is generated in the jacket, the safety valve
will open and relieve the excess pressure.
If the jacket water level gets too low, the high- limit control will open and shut
off power to the elements until the kettle cools. This will prevent the heating
elements from overheating.
Setting the operating thermostat dial 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.
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. Wir-
ing diagrams are found at the end of this manual. When in doubt, turn unit off
and call for service at 888-994-7636. USE OF ANY REPLACEMENT PARTS OTHER
THAN THOSE SUPPLIED BY THE MANUFACTURER OR AN AUTHORIZED DISTRIBU-
TOR CAN CAUSE INJURY TO THE OPERATOR AND DAMAGE TO THE EQUIPMENT
AND WILL VOID ALL WARRANTIES.
SYMPTOM
WHO
PROCEDURE
Kettle will not
heat, and heating
indicator will not
come on.
User
a. Electric power supply to the unit.
b. Water level in jacket.
c. Control circuit fuses in the control console.
REPLACE BLOWN FUSES ONLY WITH A
FUSE OF THE SAME AMP RATING. a HIGHER
RATED FUSE WILL NOT PROTECT THE UNIT
OR THE BUILDING.
Authorized
Service Rep
Only
d. For loose or broken wires.
f. Operation of variable thermostat.
g. Low water cutout switch.
h. Water probe.
i. That high limit pressure switch is closed.
Kettle will not
heat, but heating
indicator comes on.
User
a. For air in the jacket. See “Jacket Vacuum”
in the Maintenance section of this manual.
Authorized
Service Rep
Only
b. Contactor.
c. Heater elements with ohmmeter for
ground short or open element. If element is
defective, call Groen.
Kettle continues
heating after it
reaches the desired
temperature.
User
a. Thermostat dial setting.
Authorized
Service Rep
Only
b. Thermostat circuit for short.
c. Thermostat calibration.
d. Thermostat operation. The thermostat
should click when the dial is rotated above
and below the setting for the temperature
of the kettle.
e. Contactor, to determine whether it is
energized or stuck.
Kettle stops
heating before it
reaches the desired
temperature.
User
a. Thermostat dial setting.
b. Jacket water level.
Authorized
Service Rep
Only
c. Thermostat calibration.
d. Thermostat operation. The thermostat
should click when the dial is rotated above
and below the setting for the temperature
of the kettle.
e. Pressure limit switch.
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 Groen.
c. Voltage of main power source.
Safety valve pops.
User
a. For air in the jacket. See “Jacket Vacuum”
in the “Maintenance” section of this
manual.
b. Whether kettle was being heated empty
when valve popped.
Authorized
Service Rep
Only
c. Pressure limit switch.
d. Thermostat operation. Thermostat should
click when the dial is rotated above and
below the setting for the temperature of the
kettle.
e. Safety valve. If the valve pops at pressures
below 48 PSI, replace it.
f. Contactor, to determine whether it is de-
energized.
Safety valve leaks
a small amount of
steam when the
kettle is operating.
User
a. For contamination that prevents seating of
valve. With full pressure in the jacket, pull
the chain all the way briefly to blow the
valve clean, then let it snap back to seat the
valve.
Authorized
Service Rep
Only
b. Safety valve for defects. Replace any
defective valve with an identical valve.
