Preferred JC-23D2 Installation & Operation Instructions

Preferred Utilities Mfg Corp
Preferred Instruments div.
31-35 South Street, Danbury CT 06810
203-743-6741
www.preferred-mfg.com
SDI-JC-23D2 rev 8-23-22
JC-23D2 Flue Temp, Opacity, Draft Controller
Installation & Operation Instructions
The JC-23D2 3-in-1 Flue Temp, Opacity and Draft controller maintains the
flue gas at a constant positive or negative Draft by modulating the outlet
damper on a boiler or furnace while also monitoring flue gas temperature
and stack opacity. A separate 4-20mA Draft transmitter is required to
modulate the damper.
The JC-23D2 interfaces to the burner flame safeguard to automatically
sequence the outlet damper Open for: Purge, Light-Off, and Post-Purge.
The sequence closes the damper after the burner shutdown to minimize
heat loss up the stack.
A separate time delayed Draft Cutout switch wired into the flame safeguard
Lockout Limits is required by Code for Safety.
.
The JC-22XMTR-xxCO includes a separate Draft xmtr and a separate time
delayed Draft Cutout switch in a single enclosure to reduce installation effort.
The JC-23D2 includes a burner shutdown relay that can be wired into the
FSG limits circuit for a high flue temp shutdown or a high opacity shutdown
or both.
Features
 Automatic Draft Control for increased boiler efficiency and reliability.
 Precision Outlet Draft Control for low NOx induced FGR burners.
 Firing Rate Feedforward option is included and assures stable draft during
load changes. Separate curves for up to two fuels.
 Automatic Damper Sequencing for purge, lightoff, post-purge burner
shutdown, and standby. Simple Flame Safeguard interface.
 Damper Adjustable Start Position option is included for installations with
excessively high draft during lightoff.
 High Flue Temp, Draft, and Opacity Alarms with time stamped alarm and
event history.
 Light Source and Sensor 190851S and 190851D interface directly with
the JC-23D2.
 Opacity Calibration is automated, there are no manual adjustments.
 Automatic Opacity Calibration can be configured to occur when the burner
fan shuts off.
 Flue Temperature Sensor accepts Type J or K thermocouple input.
 5" Color LED Touchscreen for easy viewing. All setup can be done from
the touchscreen.
 Modbus Communication with RS-485 and Ethernet capability.
NYC DEP Accepted
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