Product Overview | 8663C Cycle Control Manifold
The 8663C Manifold controls pneumatic cycling valves on
8663C- Manifold Designation
Pneumatic Logic Description
Control Valve Configuration
individual TwinBed ® II burners. Electrical signals from the control panel actuate the 8663C which supplies/vents compressed air to open and close cycling valves that control combustion air, exhaust, flue gas recirculation (FGR), gas, and oil. Air, exhaust, and FGR valves that are pneumatically operated. FGR and oil are not always used, as a result the 8663C is available in a number of models for different control requirements. Systems with all pneumatic cycling valves require an 8663C- -P Manifold while systems with electrically operated fuel valves use an 8663C- -E Manifold for pneumatic control of air, exhaust, and FGR. If your system is dual-fuel with an electrically operated gas and pneumatically operated oil cycling valve, use the 8663C-1-P. The manifold will be supplied with the second fuel port plugged. The 8663C controls a single burner, therefore two manifolds are required to control a pair of burners. Typically, the 8663A is used when each burner in a pair is mounted on opposite sides of a furnace. (For pneumatic logic arrangements, refer to Piping Schematic 1444A. For combustion system piping, refer to Piping Schematic 4343.)
Both burners cycling
Both burners in stop cycle Both burners in direct fire Either burner in direct fire with its twin in stop cycle
1-E
B and C
Both burners cycling
Both burners in stop cycle Both burners in direct fire Either burner in direct fire with its twin in stop cycle
1-P
B, C and D
Both burners cycling
Both burners in stop cycle Both burners in direct fire Either burner in direct fire with its twin in stop cycle Both burners using FGR
2-E
A, B and C
Both burners cycling
Installation:
Both burners in stop cycle Both burners in direct fire Either burner in direct fire with its twin in stop cycle Both burners using FGR
Manifolds should be mounted as close to the cycle valves as possible but not where the ambient temperature exceeds 150 °F. When piping the compressed air supply to the manifold assembly, take care in routing the pipe so that the compressed air temperature does not exceed 150 °F. Galvanized or pickled pipe is recommended on the compressed air supply to prevent pipe scale from entering the manifold assembly. Instrument quality air is preferred. An 8645A Compressed Air Filter/ Separator is recommended just upstream of the manifold.
2-P
A, B, C and D
Stainless steel tubing is recommended for the piping to the individual components.
Bulletin 8663A Page 2
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