PREFERRED INSTRUMENTS Industrial Partner

Preferred Instruments JC-22D Draft Controller Simple Type: Draft Controller

The JC-22D Draft Monitor and Controller is a microprocessorbased draft controller, indicating instrument, and alarm monitor. The JC-22D directly accepts a 4-20 mADC draft transmitter signal, 120 VAC flame safeguard interface, and outputs a solid state switching (triac) or 4-20 mADC outlet damper actuator control signal. Draft is continuously displayed using a highly visible backlit LCD display. An intuitive bargraph display and alarm message provide clear boiler draft status. All adjustments can be made directly from the faceplate of the instrument by scrolling through user friendly, English language menus. The outlet damper may be controlled in “Auto” or “Manual” mode and will automatically sequence through the purge, light-off, post-purge and burner shutdown modes in response to flame safeguard system inputs. The JC-22D automatically positions the outlet damper according to burner operation based on either the field selectable “Floating” or “Precise Draft” Control modes.

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