AERCO C-More Controls Manual June 2010 - Manual (Page 120)

C-More Controller for Benchmark, Innovation & KC
USER MANUAL
Page 120 of 162 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 04/22/14
GF-112 Phone: 800-526-0288 OMM-0032_0E
The BST Integral Gain item sets the fraction of the output, due to BST Setpoint error, to add or
subtract from the output each minute to move towards the BST Setpoint.
BST Deriv Time (Span 0.00 min – 2.00 min, Default = 0.10 min)
The BST Deriv Time item is the Derivative component of the PID control algorithm.
The BST Deriv Time item value (0.00 to 2.00 min.) responds to the rate of change of the
setpoint error. This is the time that this action advances the output.
BST Deadband Hi (Span = 0 – 25, Default = 1)
BST Deadband Lo (Span = 0 – 25, Default = 1)
Note! These values are scaled in either Degrees F or Degrees C depending on the Degrees
Scale selected by the user on the S-More Setup Menu.
The Deadband High and Deadband Low settings create the “Header Temperature” Zone in
which no Valve Position corrections will be attempted.
When the header temperature reaches the BST setpoint and remains within the range BST
Setpoint +1degree and BST Setpoint -1degree for the period of time entered into “Deadband En
Time”, The Deadband Mode is set and all valve position corrections will be halted. When the
Outlet Temperature drifts out of the Deadband ZONE (BST Setpoint + BST Deadband Hi) &
(BST Setpoint - BST Deadband Lo), the DEADBAND MODE will be terminated and the PID
LOOP will again attempt Valve Position corrections.
When in Deadband mode, the
˚F or ˚C LED on the C-More Control Panel will flash to confirm
Deadband Mode is set or reached.
Deadband En Time (Span = 0 seconds – 120 seconds, Default = 30 seconds)
The “Deadband En Time” is the amount of time the header temperature has to stay within the
temperature range BST Setpoint +1 and BST Setpoint -1 before invoking the BST Deadband
Mode.
BST FR Up Rate (Span = 1 sec – 120 sec, Default = 20 sec)
The BST Fire Rate Up Rate controls the frequency of updates made to the BST Fire Rate sent
to all boilers. This feature can be used to slow down the rate of change of the Fire Rate of the
BST System. The BST PID calculates the BST Target Fire Rate for the system. When we need
to increase the Fire Rate to all boilers, the BST increases the Fire Rate of all ignited boilers
incrementally based on the BST FR Up Rate.
Example: If the BST FR Up Rate is set to 20 sec, Incremental increases will be made to the
BST Fire Rate every 20 seconds until we reach the BST Target Fire Rate.
The Fire Rate increase is 2% per BST FR Up Rate until we are withinn10 Degrees F of
setpoint, at which time the increase is 1% per BST FR Up Rate. This feature does not apply to
decreasing fire rate.
(See Appendix C for Reset Ratio, Header Temperature setup charts)
BST Bldg Ref Tmp (Span = 40°F - 230°F, Default = 70°F)
BST Bldg Ref Tmp is used with Outdoor Reset Setpoint Mode. It is the temperature the system
references to begin increasing its header temperature (See section BST Reset Ratio for more
details). Default is 70°F. It can be varied from 40°F to 230°F.
(See Appendix C for Reset Ratio, Header Temperature setup charts)