CleaverBrooks CFC-500 Operation, Service And Parts Manual page 221

Parameter Name
Plate preheat off The preheat off threshold is calculated as:
hysteresis T
OFF
If the preheat block is True, then it becomes False when:
• Tap during Preheat is recognized (see below) OR
• Both
•
•
Plate preheat This parameter provides the minimum on time for preheating.
minimum on time
Plate preheat on The preheat on threshold is calculated as:
hysteresis T
ON
If the preheat block is False, then it is Set (becomes True) when:
1. Tap demand is false, AND
2. The preheat delay-after-tap time has elapsed, AND
3. DHW sensor temperature <= T
4. The above have remained true for the time specified by:
That is, whenever conditions 1, 2, or 3 are not true, a preheat recognition timer is reset.
Whenever they are all true then the timer is allowed to run. If the time elapses then the
preheat block becomes true (preheat is active, and this causes the plate demand to be
true).
Plate preheat on This parameter provides the time duration for recognizing that preheat demand exists.
recognition time
Plate preheat This parameter provides the DHW setpoint used when firing for preheat. It also is used as
setpoint the basis for detecting the need to preheat.
Postpurge rate This parameter specifies the analog output or fan speed used during Postpurge.
Postpurge time This parameter sets the burner control's postpurge time. Setting this parameter to zero
disables prepurge.
Preignition time hr:mm:ss
Prepurge rate This parameter specifies the analog output or fan speed used during Prepurge.
Prepurge time This parameter sets the burner control's prepurge time. Setting this parameter to zero
disables prepurge.
Pulses per The number of pulses per revolution of the fan is provided by this parameter. (Typically it is
revolution the number of Hall-effect sensors that the fan contains.)
Pump exercise This parameter specifies the maximum number of days that a pump can be off. If this limit is
interval reached then the pump is turned on for the specified exercise time. If the interval is zero
then this exercise function is disabled.
Pump exercise time This parameter specifies the amount of time that a pump remains on, when it has been
turned on due to the exercise interval. If this time is zero then the exercise function is
disabled.
Purge rate proving This parameter specifies the input used to confirm the Prepurge rate has been reached.
PWM frequency This parameter provides the frequency of the pulse-width modulation for variable speed fan
control.
Run flame failure If flame fails in Run and recycle is selected then the burner control recycles back to the
response beginning of Prepurge, then continues with the normal burner startup process to attempt to
light the burner again.
Run stabilization During run stabilization the modulation rate is held at the Lightoff Rate parameter setting
time and is released for modulation only after the hold time given by this parameter has expired.
If this parameter is zero then there is no stabilization time.
Slow down ramp Whenever the burner is firing it will be commanded to decrease its RPM no faster than the
rate provided by this parameter.
Slow start ramp When slow start limiting is effective, the modulation rate will increase no more than the
amount per minute given by this parameter.
Slow start setpoint If slow start limiting is enabled and the outlet temperature is less than the temperature
provided by this parameter, slow start rate limiting is effective, whereas whenever the outlet
temperature is above this value, slow start limiting has no effect.
Spark Voltage Spark voltage configuration for Safety uC
Table 47. Parameter Glossary.
= Plate preheat setpoint + Plate preheat off hysteresis
DHW sensor temperature >= T
The preheat minimum on time has elapsed.
= Plate preheat setpoint - Plate preheat on hysteresis
Plate preheat on recognition time
Short Description
, AND
OFF
, AND
ON
97
CB FALCON
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