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OPERATING SEQUENCES
1.
Turn On-Off / Temperature Dial
3.
Ignitor Sparks
4.
Temperature Reached
5.
Maintaining Temperature
SOLID STATE CONTROL SEQUENCE
Our solid state controls consist of the following components.
On-Off / Temperature
Dial (Potentiometer)
Control Box
Water Level Probe
Tilt Switch
Thermistor
Green LED Light
Red LED Light
Relay (RY-1)
NOTES:
* A ground loop circuit must be established between kettle body, water in jacket, water level probe and
control box. If this loop is present, it indicates that there is sufficient water in the kettle for safe operation.
* If there is not sufficient water in the jacket then the loop is broken and the control box will prevent 14v DC
from being supplied to pin #8. The control relay (RY-1) will remain (or return) to the normally open
position and the unit cannot heat. The red LED light will be illuminated.
*
14 volt transformer is energized and powers solid state control system.
*
Temperature knob is turned up and control box calls for heat.
*
Relay (RY-1) closes and powers 24 volt transformer.
*
Ignition control box is powered.
*
Gas valve is energized.
*
Ignitor sparks and ignition occurs.
*
Solid state controls senses temperature reached.
*
Relay (RY-1) opens and 24 volt transformer loses power.
*
Ignition control box is turned off.
*
Gas valve closes.
*
Solid state controls senses temperature drop.
*
Relay (RY-1) closes and powers 24 volt transformer.
*
Ignitor control box is powered.
*
Steps three and four are repeated.
*
Provides or interrupts electrical power to the control system.
*
Rotate to change resistance from 0 to 50,000 ohms. This resistance is
compared to the resistance on the thermistor using a voltage comparator
circuit inside the control box.
*
If the resistance is lower than the thermistor resistance then the control box will
provide 14v dc to pin #8. The green indicator light illuminates and the control
relay (RY-1) is energized closed to provide power to the heating system.
*
Analyzes inputs from water level probe, tilt switch, potentiometer, thermistor.
*
Energizes control relay (RY-1)
*
Senses water in jacket.
*
When kettle is in upright position tilt switch is closed to complete circuit
between pin #8, the relay (RY-1) and green indicator light.
*
The thermistor resistance decreases as temperature increases. When the
thermistor resistance equals the potentiometer then 14v dc is removed from
pin #8. The control relay (RY-1) returns to the normally open position.
Indicates that the control box is calling for heat. Pin #8 powered.
Indicates that the water level probe is not immersed in water. Not enough water
in the jacket or kettle tilted.
When energized allows the heating circuit to function. Electric elements or gas
burner system.
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