28
SEQUENCE OF OPERATIONS
1.
To turn the unit on, turn the switch to the on
position.
■
Power is sent to primary side of the
120vac/16vac transformer.
■
Power is sent to the normally closed high limit.
■
From the high limit power is sent to the normally
open contacts of the 12VDC relay.
2.
From the secondary of the transformer 16VAC is
sent to the controller.
■
Power is sent to the red LED (low water indicator
light) from terminal 4 of the controller.
■
If the water probe is grounded through water the
LED will go off.
■
If the water probe is not grounded the LED will
remain on and the unit will not heat.
■
If the resistance of the thermistor is higher than
the setting of the potentiometer( the unit is calling
for heat) then 16VDC is sent to the coil of the relay
and the green LED (heat indicator light)
■
The 12VDC relay will close until the unit reaches
temperature
3.
With the contacts of the relay closed, power is sent
to the 24 VAC transformer.
■
The transformer sends 24 VAC to the ignition
module.
■
Ignition module sends 24 VAC to the Amber LED
■
The ignition module will send spark to the igniter
and 24 VAC to the gas valve.
■
With 24VAC to the gas valve the valve opens
and gas is sent to the burner.
■
Spark and gas together cause ignition.
■
When this happens and the module reads at
least 0.7 micro amps DC within 4 seconds, the
Amber light will go out and the 24 VAC will remain
on the gas valve.
■
The unit will heat causing the water to boil and
steam to be generated.
■
If the module does not see the 0.7 micro-amps in
4 seconds, the module will try again in 15 seconds.
It will try 3 times then lock out.
4.
The kettle will heat (build pressure) until the
controller is satisfied by the thermistor at the
setting of the potentiometer.
■
The controller will then turn off the heat circuit
until the temperature of the kettle is below the
setting.
■
When the temperature drops below the setting
the controller will send 12 VDC to the relay and the
heat circuit will be energized again.
5.
To turn the unit off, place the switch in the off
position.
■
Power will be removed from the controller and
the heat circuit will de-energize.
