OPERATING SEQUENCES
1.
Turn On-Off Switch "ON"
*
16 volt relay is energized and powers solid state control system.
2.
Temperature Control Knob
*
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.
3.
Ignitor Sparks
*
Gas valve is energized
*
Ignitor sparks and ignition occurs.
4.
Temperature Reached
*
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.
5.
Maintaining Temperature
*
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.
SOLID STATE CONTROL SEQUENCE
Our solid state controls consist of the following components.
On-Off Toggle Switch
*
Provides or interrupts electrical power to the control system.
Control Box
*
Analyzes inputs from water level probe, tilt switch, potentiometer, thermistor.
*
Energizes control relay (RY-1)
Water Level Probe
*
Senses water in jacket.
Tilt Switch
*
When kettle is in upright position tilt switch is closed to complete circuit between
pin #8, the relay (RY-1) and green indicator light.
Potentiometer
*
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 16v 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.
Thermistor
*
The thermistor resistance decreases as temperature increases. When the,
thermistor resistance equals the potentiometer then 16v dc is removed from pin
#8. The control relay (RY-1) returns to the normally open position.
Green LED Light
Indicates that the control box is calling for heat. pin #8 powered.
Red LED Light
Indicates that the water level probe is not immersed in water. Not enough water
in the jacket or kettle tilted.
Relay (RY-1)
When energized allows the heating circuit to function. Electric elements or gas
burner system.
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 16v 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.
16
Содержание Cleveland Range KGT-12-T
Страница 21: ...18 WIRING DIAGRAM...
