CleaverBrooks CFC Operation, Service & Parts Manual page 233

Parameter Name
DHW high limit If Recycle && hold is selected, the burner control recycles and waits for the DHW
response 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.
DHW high limit If the DHW temperature reaches the value given by this parameter then a response will
setpoint occur.
DHW hysteresis The time needed for one step of hysteresis shift, when the off hysteresis threshold or on
step time hysteresis threshold is shifted due to a burner-on or burner-off event, respectively. Zero
disables this function.
DHW I gain This gain applied to the Integral term of the PID equation for the DHW loop.
DHW maximum Provides the upper limit of analog output or fan speed during modulation when firing for
modulation rate DHW.
DHW modulation This parameter selects the source of modulation control for the DHW system. If the selected
sensor 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.
DHW off hysteresis The off hysteresis is added to the DHW Setpoint to determine the temperature at which
DHW demand turns off
DHW on hysteresis The on hysteresis is subtracted from the DHW Setpoint to determine the temperature at
which DHW demand turns on.
DHW P gain This gain applied to the Proportional term of the PID equation for the DHW loop.
DHW priority source Disabled, DHW heat demand
DHW priority Boost during priority time, drop after priority time
method
DHW Priority Time When enabled, the DHW Priority Override Time is derated when the outdoor temperature is
ODR Enable 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.
DHW priority versus This parameters determines the priority of DHW versus the CH call-for-heat, when both of
CH 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.)
DHW priority versus This parameters determines the priority of DHW versus the LL slave call-for-heat, when
LL 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.)
DHW priority If this parameter is non-zero then a DHW demand will take priority over other demand
override time 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.
DHW pump cycles Can be written to a new value (e.g. if the pump or controller is replaced).
DHW pump frost This time indicates how long the DHW pump should remain on after frost protection demand
protection overrun ends. That is, whenever the pump has been on due to frost protection and then this demand
time ends, it always continues to run for the time given by this parameter.
DHW setpoint This Setpoint is used whenever the time-of-day switch is off or not connected (unused).
DHW slow start This parameter enables or disables the slow start limit function for DHW demand.
enable
DHW storage This parameter enables or disables the DHW storage feature. If it is disabled then the other
enable parameters below are ignored.
DHW storage off This provides the off hysteresis as an offset that is applied to the DHW storage setpoint,
hysteresis used during DHW storage demand.
DHW storage on This provides the on hysteresis as an offset that is applied to the DHW storage setpoint,
hysteresis used during DHW storage demand.
DHW storage The temperature setpoint that the boiler maintains during the DHW storage time.
setpoint
DHW storage time The time DHW storage temperature is maintained.
DHW time of day This Setpoint is used when the time-of-day switch is on.
setpoint
Table 47. Parameter Glossary.
Short Description
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