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BCS6000C-9
APPENDIX L: OPTIMIZER OPERATION
Some systems are configured to include special provisions for fuel optimization. This feature
enables firing gas as the primary fuel along with a secondary (Optimizer) fuel. The percentage
of the secondary fuel is adjustable and may be changed while the burner is in operation.
NOTE: On burners with a low fire bypass oil valve, a Normally Open Oil Bypass Solenoid valve
must be installed. This valve is wired to terminal 29 in order to energize the valve and shut off
low fire bypass oil flow when the gas valves are energized.
The following additional inputs and displays are provided on the RUN MEMU screen:
SET %: Used to set the desired Optimizer fuel percentage (5.0% minimum 99.9%
maximum). Note that this value may be changed at any time before or during burner
operation.
MODE: Two operating modes are available for Optimizer operation.
o PROP: This is the normal selection for optimizer operation. This mode
proportionately distributes fuel input between gas and oil. For example; if the
temperature control is calling for 50% output and SET % is 70.0, the optimizer
fuel motor will drive 35% open (70% of 50%) and the gas control motor will drive
15% (30% of 50%). Once the motors have reached these positions, the
ACTUAL % display will read 70.0%.
o FIXED: In this mode the gas control motor will supply a fixed portion of the fuel
input and the optimizer motor will then begin opening to supply any additional
heat required. The fixed percentage for gas input is determined by
subtracting the SET % from 100%. Repeating the above example in the fixed
mode instead of the proportional mode would result in the gas control motor
supplying the first 30% of the heat demand (100% - 70%), and the optimizer
control motor driving 20% open (50% - 30%) to supply the remainder. The
ACTUAL % display in this example would then read 40.0% (0.20 / 0.50).
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