North American TwinBed ® II Furnace Pressure Control
Sheet 4343-6
The systems on this sheet are meant to convey the functions rather than the actual hardware used in control. There are many combinations of hardware and logic that can be used. CONTROL OF CLEAN EXHAUST GAS FLOW AND FURNACE PRESSURE Typical for non-fouling furnaces
When flue damper is fully closed, setpoint of exhaust is lowered. When flue damper is fully open, setpoint of ehaust is raised.
Furnace pressure control
Air jet damper
Furnace pressure transmitter
EPIC ® II
Exhaust temp. control
Combustion air
Exhaust control valve
From combustion air
Reference
Pressure tap
Exhaust cycle valve
Exhaust ther- mocouple
POC = products of combustion
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