North American TwinBed ® II 8663B Cycle Control Manifold for Pair of Burners
Bulletin 8663B
The 8663B Manifold controls pneumatic cycling valves on a pair of TwinBed II burners. Electrical signals from the control panel ac- tuate the 8663B which sends/vents air to open and close cycling valves that control combustion air, exhaust, and gas. Air and ex- haust valves are almost always pneumatically operated, but fuel valves can be either electrically or pneumatically controlled. As a result the 8663B is available in a number of models for different control requirements. Systems with all pneumatic cycling valves require a 8663B- -P Manifold while systems with electrically operated fuel valves use an 8663B- -E Manifold for pneumatic control of air and exhaust. The 8663B controls two burners while the 8663A controls one TwinBed II burner. As a result the 8663B is used when burners are next to each other. One manifold is required per burner pair. The 8663A is used when a burner pair is mounted on opposite sides of a furnace. Two manifolds are required for a burner pair. See Bulletin 8663A. (For pneumatic logic arrangements, refer to Piping Schematic 1444A. For combustion system piping, refer to Piping Schematic 4343.)
8663B Cycle Control Manifold
8663B- Manifold
Pneumatic
Control
Reference Manifold Schematic
Logic
Valve
Designation
Description
Configuration
11-E
Both burners cycling Both burners in stop cycle Both burners cycling Both burners in stop cycle Both burners cycling Both burners in stop cycle Both burners in direct fire Both burners cycling Both burners in stop cycle Both burners in direct fire
B and C
MS11
11-P
A,B,C, and F
MS11
12-E
B,C, and E
MS12
12P
A,B,C,E, and F
MS12
(continued)
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