Blodgett BLP-G Series - Manual (Page 13)

OM-BLT/BLP-G 13
Sequence of Operation
The following “action-reaction” outline is provided to help understand how the kettle works.
A. Standard Models with Spark Ignition
1. When the power switch is turned on, it starts the spark igniter and opens
the automatic valve for the pilot burner. The spark ignites a pilot flame,
which heats the sensor. The sensor then sends a signal to turn off the
spark. The flame thereafter acts as a standing pilot until the power is
turned off.
2. If the pilot flame is not sensed within 70 seconds after spark begins,
a timer shuts down the entire operation. To attempt a second trial for
ignition, turn off the power switch. Check the gas supply valves and wait
five minutes before trying again by switching power on. If there is still no
pilot flame in four tries, close all valves, turn off the power, and contact an
authorized Service Agency.
3. When the operator sets a temperature on the thermostat, it allows the
automatic gas valve to admit gas to the main burners, where it is ignited
by the pilot flame. When the braising pan reaches the set temperature, the
thermostat switch opens. This stops the signal to the gas control valve and
shuts off gas to the main burner. The pilot flame remains lit. When the pan
cools below the set temperature, the thermostat switch closes and starts
another cycle. On and off cycling continues and maintains the pan at the
desired temperature. This action is indicated by the Heat indicator light.
B. Models with Optional Standing Pilot Ignition
1. When the operator presses down the knob on the Combination Gas
Control Valve and turns it to “Pilot”, gas is admitted to the pilot burner.
Depressing the knob in this position overrides the automatic control, which
otherwise shuts off all gas supply when the thermopile is cold. Lighting
and maintaining the pilot flame for sixty seconds heats the thermopile
to operating temperature, so the thermopile begins to provide electric
current at 750 millivolts. Electricity from the thermopile powers the control
circuit and the Combination Gas Control Valve. When the thermopile begins
operating at full capacity, the knob may be released.
2. When the knob is turned to “ON”, the automatic valve for the main
burner is able to open. Setting the thermostat to call for heat causes the
thermostat to send a signal to the valve, which opens and admits gas to
the main burner. Gas from the main burner is ignited by the pilot flame.
When the pan reaches the set temperature, the thermostat switch opens,
stopping the signal to the main burner valve and causing the valve to close.
When the pan cools below the set temperature, the thermostat switch
closes and starts another heating cycle. On-off cycling continues and
maintains the pan at the desired temperature.