CleaverBrooks CFC-1000, Operation, Service And Parts Manual

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CB FALCON
99 750-265
Tap detect on
hysteresis The second tap demand “set” criteria depends on the value of the DHW sensor. If the
temperature is less than or equal to the threshold given by subtracting this parameter from
the normal DHW setpoint, and if this condition has persisted for the time specified by the
Tap detect recognition time parameter, the Tap demand block is “Set” (Tap demand
becomes true and the minimum on timer is started). 36
Tap detect on
recognition time This parameter provides the time for a Tap detect event due to the Tap detect on hysteresis
parameter, as described just above. 36
Tap stop Inlet-DHW
degrees One criteria for asserting “Clr” is based on the difference between the DHW and the Inlet
temperature, calculated as: Inlet - DHW. When this value is positive and is greater than or
equal to the degrees given by this parameter, tap demand’s “Clr” input is asserted. 37
Tap stop Outlet-Inlet
degrees The other criteria for asserting “Clr” is based on the difference between the Outlet and the
Inlet temperature, calculated as: Outlet - Inlet. When this value is negative or is less than or
equal to the degrees given by this parameter, tap demand’s “Clr” input is asserted. 37
Temperature units This parameter determines whether temperature is represented in units of Fahrenheit or
Celsius degrees. 21
Warm Weather
Shutdown Enable, Disable, Shutdown after demands have ended, Shutdown immediately 19
Warm Weather
Shutdown Setpoint Temperature, None 20
XX pump output This allows the XX pump function to be disconnected or to be attached to any of the pump
outputs.
If two pump blocks are connected to the same pump output then their signals are effectively
OR'd together as shown in Fig. 22. 54
XX pump control The XX pump can be turned on manually, or it can be set to operate automatically. If it is
turned on then it remains on until changed back to Auto. 54
XX pump start delay When the pump demand changes from off to on, this delay time is used to delay the start of
the pump. The pump then starts after the delay expires, assuming that the demand is still
present.
A delay time of zero disables the delay.
For a stand-alone (non-slave) Falcon, this delay is skipped and does not occur if it is
already firing when the pump demand off-to-on event occurs.
For a Falcon in slave mode, this delay is skipped and does not occur if the “Master Service
Status” (defined in the LL specification and noted in the drawing) informs the slave unit that
some slave burner in the system is already firing, when the pump demand off-to-on event
occurs.
55
XX pump overrun
time This time indicates how long the pump should remain on after pump demand ends.
A time of zero disables the overrun.
However, a pump should overrun to use up the last of the heat only if it is the last pump
running.
Therefore: For a stand-alone Falcon if any local service is active then this status cancels
any overrun that is in-progress.
For a slave Falcon if any master service is active at this time this status cancels any overrun
that is in-progress. 55
XX pump cycles The XX pump cycle counters are mapped to the physical cycle counters; there is one
counter for each of the three physical pump outputs and this counter is visible via this
parameter, for whichever pump block (or blocks) are connected to it via the block's XX
pump output parameter. It is possible for two (or more) pump functions to be assigned to the
same physical pump. In this case, that physical pump's cycle counter is visible in each
pump control block. A pump cycle counter has the range 0 through 999,999 and it can be
restarted if a pump is replaced. 55
Table 47. Parameter Glossary.
Parameter Name Short Description Ref. Page