SAVANNAH STOKER v3 INSTRUCTION MANUAL
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8
Operational Parameters Defined, continued from page 7
6.3.4
“t” Cycle time
Cycle time
“t”
is a time period (in seconds) the controller uses to
calculate the auger’s runtime. This is also known as the duty cycle.
Default is 20 seconds.
Example: If the cycle time parameter is set to
t=20
, and the controller
has determined the output for the next cycle should be 25%, the auger
will run for 5 seconds at the start of the next cycle and will be off for the
remaining 15 seconds of the cycle.
Notes:
The default value for the cycle time is 20 seconds. This gives the
best performance for most stock configured grills. The controller also
runs the auger a minimum amount each duty cycle to maintain the fire
much like a pilot light. The minimum amount is controlled by parameter
“
OutL
”, and the maximum limit is controlled by parameter “
OutH
”.
If the cycle time is less than 20 seconds the auger may not run long
enough during each duty cycle to maintain the fire. Before lowering the
value of either the cycle time or OutL, refer to section 6.4 “How to
Determine the Lowest Stable OutL Value”.
Larger cycle times typically give larger temperature swings except on
large insulated cookers where a cycle time of 45 or 60 may have to be
used.
6.3.5
“Sn” Sensor Input Selection
Sn
is used to define the type of input sensor used.
Pt
= The default value for the temperature sensor (PT1000 RTD)
shipped with the controller and for the sensor used with the stock
controller.
K
= K-Type thermocouple.
6.3.6
“Pb” Sensor Calibration Offset
Pb
is used to set an input offset to compensate the error produced by
the sensor. Use this to calibrate the sensors PV reading.
6.3.7
“OutL” and “OutH” Auger Runtime Limits
OutL
and
OutH
are runtime limits of the auger. The value is a
percentage of the total cycle time, parameter “t”.
OutL
is the minimum % of the cycle time the auger will run at the start of
each cycle. Default is 17%. A minimum run time is required to maintain
the fire. See the top of the next column. Example: With a cycle time t=20,
and
OutL
=17, the auger will run for 17% of the 20 second cycle time or
3.4 seconds.
OutH
is the maximum % of the cycle time the auger will run.
Default is 100%. The high limit is used to help reduce temperature
overshoots that will occur at start-up, after the cooking chamber door is
opened, and after the target temperature is increased. The default value
works well with most grills. On small grills better performance is achieved
with a lower value of 70 or 80.
CAUTION:
A pellet grill requires a minimum amount of fuel feed
per cycle time to maintain the fire.
If
OutL
is too low the fire will go out; too high and the smoking
temperature will be too hot on very hot days. The default value
will give satisfactory results with most stock pellet grills. If you
need to change the
OutL
value refer section 6.4.
6.3.8
“C-F” Selecting Fahrenheit or Celsius
Parameter
C-F
is used to change between Celsius and Fahrenheit.
F= Fahrenheit (default)
C= Celsius
If changing to Celsius, Change the value of “P”, See Section 6.3.3
6.3.9
“FAnS” Fan Speed
FAns
is used to change the fan speed.
3= Normal fan speed
2= Medium Fan Speed
1= Low Fan Speed. (not recommend except for cold smoking)
6.3.10
“Fant” Fan Shut Off Temperature
The unit is degree. When the controller is turned off, the fan will
continue to run until the cooking chambers temperature is cools down to
the temperature set by
Fant
. For example, if the
Fant
is set to 130, the
display will flash between "Hot" and “current smoker temperature", until
the smoker temperature drops to below 130 degree.
6.4
How to Determine the Lowest Stable Value for OutL
.
1)
Start the grill normally. Set the target temperature to 225°F. Let the
temperature stabilize for 20-30 minutes.
2)
Change the parameter values of: t=20 and OutL = 10.
3)
Change the controller to Manual mode. See section 5.2
4)
Press the ▼or ▲KEYs to set the value in the lower display to 17.
5)
The grill’s temp will slowly lower until it stabilizes. This could take
30-45 minutes or longer. If the grill’s temperature (PV) drops below
160° raise the output value by 2.
6)
After the temperature becomes stable; take the average
temperature; then, do one of the following.
a)
If the average is between 170-180°, do nothing.
You have a found the stable value for OutL.
Enter the lower display value as the OutL parameter value.
b)
If above 180° lower ▼the SV value by 1, retest
c)
If above 190° lower ▼the SV value by 2, retest
d)
If below 170° raise ▲the SV value by 1, retest
e)
If below 160° raise ▲the SV value by 2, retest
