CB FALCON
93 750-265
DHW high limit
response
If Recycle && hold is selected, the burner control recycles and waits for the DHW
temperature to fall. It will remain in this holding condition until the DHW temperature is lower
than the DHW high limit temperature minus 5 degrees F.
49
DHW high limit
setpoint
If the DHW temperature reaches the value given by this parameter then a response will
occur.
49
DHW hysteresis
step time
The time needed for one step of hysteresis shift, when the off hysteresis threshold or on
hysteresis threshold is shifted due to a burner-on or burner-off event, respectively. Zero
disables this function.
34
DHW I gain This gain applied to the Integral term of the PID equation for the DHW loop. 34
DHW maximum
modulation rate
Provides the upper limit of analog output or fan speed during modulation when firing for
DHW.
51
DHW modulation
sensor
This parameter selects the source of modulation control for the DHW system. If the selected
input is not a temperature (e.g. S1 is steam pressure for a steam control) then an alert
occurs and the DHW control subsystem is suspended.
35
DHW off hysteresis The off hysteresis is added to the DHW Setpoint to determine the temperature at which
DHW demand turns off
34
DHW on hysteresis The on hysteresis is subtracted from the DHW Setpoint to determine the temperature at
which DHW demand turns on.
34
DHW P gain This gain applied to the Proportional term of the PID equation for the DHW loop. 34
DHW priority source Disabled, DHW heat demand 19
DHW priority
method
Boost during priority time, drop after priority time 19
DHW Priority Time
ODR Enable
When enabled, the DHW Priority Override Time is derated when the outdoor temperature is
below 32°F. When the outdoor temperature is at or above 32°F, the programmed time is
used as-is. For temperatures at or below -40°F, the programmed override time is derated to
zero (no override).
Between 32°F and -40°F, a linear interpolation is used. For example, at -4°F, DWH priority
override time is half the value provided by the parameter.
34
DHW priority versus
CH
This parameters determines the priority of DHW versus the CH call-for-heat, when both of
these are enabled and active. (If DHW has a lower priority, it may be boosted to the highest
priority temporarily via the DHW Priority Override Time parameter.)
20
DHW priority versus
LL
This parameters determines the priority of DHW versus the LL slave call-for-heat, when
more than one source is enabled. (If DHW has a lower priority, it may be boosted to the
highest priority temporarily via the DHW Priority Time parameter.)
20
DHW priority
override time
If this parameter is non-zero then a DHW demand will take priority over other demand
sources for the specified time. If this persists for longer than this time the priority will expire.
The timer is reset when demand from the DHW source turns off.
20
DHW pump cycles Can be written to a new value (e.g. if the pump or controller is replaced). 6
DHW pump frost
protection overrun
time
This time indicates how long the DHW pump should remain on after frost protection demand
ends. That is, whenever the pump has been on due to frost protection and then this demand
ends, it always continues to run for the time given by this parameter.
42
DHW setpoint This Setpoint is used whenever the time-of-day switch is off or not connected (unused). 34
DHW slow start
enable
This parameter enables or disables the slow start limit function for DHW demand. 49
DHW storage
enable
This parameter enables or disables the DHW storage featu
re. If it is disabled then the other
parameters below are ignored.
39
DHW storage off
hysteresis
This provides the off hysteresis as an offset that is applied to the DHW storage setpoint,
used during DHW storage demand.
39
DHW storage on
hysteresis
This provides the on hysteresis as an offset that is applied to the DHW storage setpoint,
used during DHW storage demand.
39
DHW storage
setpoint
The temperature setpoint that the boiler maintains during the DHW storage time. 39
DHW storage time The time DHW storage temperature is maintained. 39
DHW time of day
setpoint
This Setpoint is used when the time-of-day switch is on. 34
Table 47. Parameter Glossary.
Parameter Name Short Description Ref. Page
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