Preferred JC-22D2 User Manual

SDI-JC-22D2 rev. 11-1-21 page 1 of 22
Preferred Utilities Mfg Corp
Preferred Instruments div.
31-35 South Street, Danbury CT 06810
203-743-6741 www.preferred-mfg.com
JC-22D2 Sequence Draft Controller
NYC DEP Accepted
Installation & Operation Instructions
The JC-22D2 controller maintains the flue gas at a constant positive or
negative Draft by modulating the outlet damper on a boiler or furnace.
A separate 4-20mA Draft transmitter is required to modulate the damper.
The JC-22D2 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.
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.

Floating Draft Control mode is the easiest to tune. Floating Control can be
used with any type of actuator or an ID Fan VSD.

PID Draft Control mode is for those who prefer this type of tuning.

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 Draft Alarm with time stamped alarm and event history.

Modbus Communication with RS-485 and Ethernet capability.

Live Data Tuning Screen for more convenient tuning.
Table of Contents:
SAFETY .............................................................................. 2
Operation ............................................................................ 3
Alarms ............................................................................ 3
History ............................................................................ 3
Standard Sequence ............................................................ 4
Control Types, Control Options, and Actuators .................. 5
Control Types: Floating vs. PID ..................................... 5
Command Types: Triac vs. mA ...................................... 5
Firing Rate Feedforward ................................................ 5
Adjustable Start Position Option .................................... 5
Configuration Compatibility Chart .................................. 5
Installation ........................................................................... 6
JC-22D2 Indicator Mounting: ......................................... 6
JC-22XMTR-xxCO Mounting ......................................... 6
Damper Actuator Linkage: ............................................. 6
Wiring Requirements ..................................................... 7
BEFORE installing the wiring: ........................................ 7
Terminal Layout and Wiring Diagrams ........................... 8
Wiring Diagrams Sheet 1 of 3 ...................................... 8
Parameters / Menu Map ................................................... 12
Screen Settings ........................................................... 13
Draft Control Setpoint .................................................. 13
Tuning ......................................................................... 13
Control Options ........................................................... 14
Sequencing ................................................................. 14
Adjustable Start Menu ................................................. 15
Draft Xmtr. ................................................................... 15
Bargraph Setup ........................................................... 15
Commissioning ................................................................. 16
Triac Servo Calibration ................................................ 16
Triac Deadband Test ................................................... 16
Firing Rate Signal Calibration ...................................... 16
Controller Tuning Screens ............................................... 17
Tuning Screen Loop .................................................... 17
Firing Rate Feedforward Curve Screen ....................... 17
Live Tuning Data Screen ............................................. 17
I/O Examine - Troubleshooting ........................................ 18
Modbus ............................................................................ 19
Parts List .......................................................................... 20
Specifications ................................................................... 20
Full Size Cutout Template ................................................ 21

Preferred JC-22D2 Specifications

General

Brand	Preferred
Model	JC-22D2
Category	Controller
Language	English