OM-TDH/C
14
Sequence of Operation
The following “action-reaction” outline is provided to
2.
High limit pressure switch, set to open at
help the user understand how the equipment works.
about 43 PSI and shut down the burners
When the operator sets the desired temperature on
the thermostat dial, the thermostat switch closes and
3.
Pop safety valve, which will release steam
sends a signal which (1) starts the spark and (2)
if the jacket pressure exceeds ±50 PSI.
opens the automatic valve for the pilot burner. The
spark ignites the pilot flame, which heats a probe.
4.
Tilt switch that shuts off all burners when
The heated probe sends a signal that causes the
the kettle is tilted.
spark to shut off and the automatic valve to admit
gas to the main burner. The pilot flame ignites the
When the kettle reaches the set temperature, the
main burner. If a pilot flame is not sensed within 30
thermostat switch opens, stopping the signal to the
seconds after the spark begins, a timer shuts down
gas control valve and causing the valve to shut off
the whole operation. In addition to the lockout timer,
all gas flow. When the kettle cools below the set
safety features include:
temperature, the thermostat switch closes and starts
1.
Low water cutoff relay that will shut off the
maintains the kettle at the desired temperature.
gas supply to all burners until the water
level is corrected.
until jacket pressure is decreased.
another heating cycle. On-off cycling continues and
Troubleshooting
Your Groen kettle 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 furnished inside the service panel and
in this manual.
If an item on the list is followed by
Y
Y
, the work should be done by a qualified service
representative.
WARNING
BEFORE REPLACING ANY PARTS, DISCONNECT THE UNIT FROM THE ELECTRIC POWER SUPPLY
AND CLOSE THE MAIN GAS VALVE. ALLOW FIVE MINUTES FOR UNBURNED GAS TO VENT.
CAUTION
USE OF ANY REPLACEMENT PARTS OTHER THAN THOSE SUPPLIED BY GROEN OR THEIR
AUTHORIZED DISTRIBUTOR CAN CAUSE INJURY TO THE OPERATOR AND DAMAGE TO THE
EQUIPMENT AND WILL VOID ALL WARRANTIES..
SYMPTOM
WHO
WHAT TO CHECK
Y
Y
indicates items which must be performed by an authorized technician.
Kettle is hard to tilt.
Auth
a. Gears for foreign materials, lubrication and alignment.
Y
Service
Rep Only
Kettle continues heating after User
a. Thermostat dial setting.
it reaches desired
temperature.
Auth
b. Thermostat calibration.
Y
Service
Rep Only
c. Thermostat operation. The thermostat should click when the dial is
rotated to settings above and below the temperature of the kettle.
Y
Kettle stops heating before it User
a. Thermostat dial setting.
reaches the desired
temperature.
Auth
b. Thermostat calibration.
Y
Service
c. Thermostat operation. The thermostat should click when the dial is
Rep Only
rotated to settings above and below the temperature of the kettle.
Y
Safety Valve
pops open
User
a. For air in the jacket. See “Jacket Vacuum” in the Maintenance
section.
b. Thermostat dial setting.
Summary of Contents for TDHC Series
Page 21: ...OM TDH C 20 Schematic...
