CleaverBrooks CFC User Manual

57 750-265
CH outdoor reset
enable
If outdoor reset is enabled then the current outdoor temperature is used to determine the
Setpoint by interpolation using CH Setpoint (or CH Time-Of-Day Setpoint if TOD is on), the
min water temperature, and the min and max outdoor temperatures.
24
CH P gain This gain applied to the proportional term of the PID equation for the CH loop. 24
CH pump control The CH 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. In Auto mode it operates according
to the demand sources listed above and the overrun time.
43
CH pump cycle
count
CH pump cycle count. Can be written to a new value (e.g. if the pump or controller is
replaced).
5
CH pump frost
protection overrun
time
This time indicates how long the CH 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.
28
CH pump output This parameter allows the CH pump function to be disconnected or to be attached to any of
the pump outputs.
43
CH pump overrun
time
This time indicates how long the CH pump should remain on after demand from any source
ends. That is, whenever the pump has been on, but the last requests for the pump to be on
ends, it always continues to run for the time given by this parameter.
43
CH sensor The sensor used for modulation and demand may be either the Outlet sensor or the Header
sensor input.
22
CH setpoint This Setpoint is used when the time-of-day input is off. If the ODR function is active, this
Setpoint provides one coordinate for the outdoor reset curve, as described for the CH
Outdoor Reset parameter.
22
CH slow start
enable
This parameter enables or disables the slow start limit function for CH (or LL slave)
demand.
33
CH tod setpoint This Setpoint is used when the time-of-day input is on. If the ODR function is active, this
Setpoint provides one coordinate for the shifted (because TOD is on) outdoor reset curve,
as described for the CH Outdoor Reset parameter.
23
Delta-T degrees If the outlet is hotter than the inlet temperature by the amount given by this parameter, the
response defined for the Delta-T Limit Response will occur. Stepped Modulation Limiting will
occur as the temperature approches this limit..
29
Delta-T delay This parameter provides the delay time for the Delta-T limit. 29
Delta-T enable This parameter enables or disables the entire delta-T limit function. 29
Delta-T response If the temperature difference exceeds the limit and Recycle && delay is selected then the
burner control recycles and holds while waiting for a delay (see the Delta-T Limit Delay
parameter) to expire.
29
Demand rate
interval time
This is the time in milliseconds between iterations of the demand/rate task. 21 (for CH)
24 (for DHW)
DHW
anticondensation
enable
This parameter enables or disables anti-condensation for the DHW sensor. 34
DHW
anticondensation
pump force off
If DHW anti-condensation is in control of the burner and this parameter is Forced off, then
the DHW pump is turned off to warm up the heat exchanger more quickly.
34
DHW
anticondensation
setpoint
If DHW anti-condensation is enabled, has priority, DHW is firing the burner, and the outlet is
below the temperature given by this parameter then the firing rate set to the Maximum
modulation rate until the temperature exceeds this this by 4 degrees F.
34
DHW D gain This gain applied to the Differential term of the PID equation for the DHW loop. 26
DHW demand
source
The source of DHW loop control can be specified to use different inputs. 26
DHW enable This parameter determines whether the DHW loop is enabled or disabled. When disabled
the demand caused by the DHW sensor is ignored. It may be disabled to turn it off
temporarily or because the application does not use this feature.
18
DHW forced rate For DHW demand, if the DHW forced rate time is non-zero, then the firing rate will be held
at the rate specified here during that time. This parameter is also needed as the starting
point for Slow State, even if the forced rate time is zero.
32
Table 30. Parameter Glossary.
Parameter Name Short Description Ref. Page

CleaverBrooks CFC Specifications

General

Brand	CleaverBrooks
Model	CFC
Category	Boiler
Language	English