Honeywell EXCEL 5000 User Manual page 51

EXCEL CARE CONTROL ICONS
Maximum off time
Minimum off time
Duty cycle type
Internal Parameters
Temperature setpoint
Duty cycle type
Parameter Number
Descriptions
NIPU and DUC Operation
No Fixed Off Times
Number type: Decimal, Unit: percent
Default: 50.0 percent, Range: 25 through 80.0 percent
Select a Maximum off time for the output (YD1 or YD2, for example, a supply fan)
that guarantees an adequate air change (minimum outdoor air rate per person). This
value refers to cycle duration.
Number type: Decimal, Unit: percent
Default: 0.0 percent, Range: 5 through 50.0 percent
Select a Minimum off time that prevents the fan motor from overheating. This value
refers to cycle duration.
Cycle time Number type: Whole number, Unit: Minutes
Default: 30 min., Range: 5 through 60 min.
Select a Cycle time that ensures that the fan motor does not switch on more often
than the allowable number of times per hour.
Determines the system type (Heating, Cooling, or Heating and cooling).
Fan type Determines whether or not the system has a two-speed fan.
Additional parameters in Excel Web / Excel Web II.
Zone temperature setpoint
with value 3 and a limit of 5 < = x < = 40.
Indication of available heating and cooling possibilities,
with value 1 and a limit of 1 < = x < = 3
(1=heating, 2=cooling, 3=heating and cooling).
P3 Comfort range (±).
P4 Maximum off time.
P5 Minimum off time.
P6 Cycle time.
P7 System type:
P8 Fan type:
P9 Highest zone temperature*
P10 Lowest zone temperature*
P11 Setpoint*
* These values are only available in the controller if you enter them as
parameters.
Using both NIPU and DUC in a system can result in command conflicts. You should
use switching tables to force NIPU to override DUC commands.
DUC does not work with fixed off times. Off time duration varies as a function of the
system load within limits you define. The following diagram illustrates how the load-
corrected off-time duration function operates in DUC.
1=heating
2=cooling
3=heating and cooling
1=Two-speed fan
0=Single-speed fan
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ALPHABETIC REFERENCE
74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)