CleaverBrooks CB120Z Instruction Manual

750-271 1
DESCRIPTION
The Cleaver-Brooks CB120Z expands on the standard CB120 (see manual 750-264) by combining
boiler control functions with the same burner management control found in the CB120. The result is
a single compact package that can directly control the boiler's output firing rate based on either input
pressure or temperature or both. The CB120Z System is designed to provide the proper burner
sequencing, ignition and flame monitoring protection on automatically ignited oil, gas, and combina-
tion fuel burners. Through the display, the operator programs the desired setpoint, cut in, cut out and
modulating range and with PID control, the CB120Z System controls the burner/boiler from start up
through shutdown, precisely maintaining the desired setpoint. The CB120Z System continuously
monitors interlocks and limits found in the L1-3 and 3-P circuits as it programs the burner/blower
motor, ignition and fuel valves to provide for proper and safe burner operation. VFD and LCD dis-
plays are available that may be either plugged in or mounted remotely to give full language descrip-
tors of current status and diagnostic lockout information as well as provide a user friendly menu
system to make setting the boiler parameters easy and understandable. Through SMART LED'S,
located on the front cover or through the display interface, the control provides current operating sta-
tus and lockout information in the event of a safety shutdown. Following are some of the major con-
trol and monitor capabilities provided by the CB120Z System:
•Operating Control Function for automatic sequencing of the boiler system to start and stop the
boiler to meet system demand.
•Full Modulation Control of fuel and combustion air through the firing rate motor to meet sys-
tem demand.
•Solid State Sensors to monitor steam pressure, water temperature, stack temperature, boiler
water temperature, or outdoor air temperature.
•High Pressure and Temperature Alarm Limits based on inputs from solid state sensors.
Exceeded limits will open interlock circuit to the flame safeguard control for shutdown of the
burner and boiler.
•Cold Start Thermal Shock Protection to slowly increase the burner firing rate on a cold start
to limit mechanical stress due to thermal differences.
•Multiple Lead/Lag operation of two or more boilers.
•User-friendly keypad display system in either VFD or LCD format featuring the all-info dis-
play mode, program and review of system setpoints and operating parameters.
•Remote Communication Capability allows reading and writing of all setpoint information.
•Password Protected Parameters (two levels of security) to restrict unauthorized entry and
modification of system setpoints and operating parameters.
CB120Z
MICROPROCESSOR-BASED
BURNER MANAGEMENT CONTROL
WITH INTEGRATED BOILER
CONTROL OPERATION
APPROVED

2750-271
•Marginal High Pressure and Temperature Alarm Limits based on input from solid state sen-
sors to indicate system approaching high alarm limits.
•Programmable Maximum High Fire Position of modulating firing rate damper motor.
•Assured low fire cut off prevents unnecessary stress caused by burner shut down at high fire.
•Auto / Manual firing rate control with bumpless transfer
A complete CB120Z System includes the chassis equipped with the type of flame amplifier required
for the application, appropriate flame detector, plug-in programmer module, appropriate tempera-
ture/pressure transducer, wiring base and alpha-numeric display. Interchangeable type programmer
modules allow for complete versatility in selection of function, timing and flame failure response
times. Refer to CB120Z PROGRAMMER SELECTION later in this document for the various com-
binations of programmer and display modules.
The chassis/flame amplifier module includes mounting screws and blank display module. The dis-
play module (833-3905 or 833-3906), if required, must be ordered separately. Functions such as pre-
purge time, recycling or non-recycling interlocks, high fire proving interlock, and trial for ignition
timing of the pilot and main flame are determined by the programmer module. The CB120Z System
can be used with ultra-violet, autocheck infrared, flame rod, self-check ultraviolet flame scanners or
direct coupled by choosing the proper chassis/flame amplifier module.
Wiring bases for the CB120Z control are available pre-wired with 4 foot lead wires color coded and
marked for easy installation or with an integral terminal block capable of a accepting up to 2 X 14
AWG wires. The wiring base terminal block is available with knockouts for conduit or open ended
for cabinet mounting. The pigtail wiring base is 4" X 5" and the terminal block wiring base is 4" X
7".
Additional functions of the CB120Z System include:
•A non-volatile memory which allows the control to remember its history and present position
even when power is interrupted.
•A consistent flame signal read-out via display module or 4-20 mA output.
•Read-out of main fuel operational hours and complete cycles via display module.
•Modbus communications via RS485 multi-drop link.
•Proof of fuel valve closure during off cycle.
•Burn-in time of program parameters occurs after 8 hours of main valve on time.
•A run/check switch which allows the operator to stop the program sequence in any of four dif-
ferent positions (Purge, PTFI, MTFI or Auto).
•Remote Display mounting with NEMA 4 protection.
•Remote Reset
•Programmable communication baud rate allows for DCS compatibility.
•Keypad selectable language readout.
•Revert to pilot can increase burner turn down.
•Additional terminals provided for applications requiring additional inputs and outputs.
CAUTION: While programmers are mechanically interchangeable in that they mate with a
common chassis/amplifier module, you should select the correct model for your application.
Inappropriate application of a control could result in an unsafe condition hazardous to life
and property. Selection of a control for a particular application should be made by a compe-
tent professional, such as a boiler/burner service technician licensed by a state or other gov-
ernment agency.
WARNING: Electro-mechanical high steam pressure or high water temperature limits must
remain in the running interlock circuit of the flame safeguard control.

750-271 3
TABLE OF CONTENTS
CB120Z SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PART NUMBERS AND APPROVALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ORDERING INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
INSTALLATION PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Wiring Base. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pressure And Temperature Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
CB120Z PROGRAMMER SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
PTFI*MTFI Timings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
LED INDICATOR LIGHTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DESCRIPTION OF FUNCTIONS OF OPERATING CONTROLS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SETTING PROGRAMMER PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
PROGRAM SET UP SUB-MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
To View And Modify A Programmable Parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
GETTING STARTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
All-info Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Set the Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Units of Measure / Display Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
System Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Control Variable Configuration Sub-menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
SEQUENCE OF OPERATION - OPERATING CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
SEQUENCE OF OPERATION - MODULATING CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
SEQUENCE OF OPERATION - MARGINAL AND HIGH ALARM LIMITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
SEQUENCE OF OPERATION - LEAD/LAG CONTROL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
ALTERNATE USES FOR LAG2 INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
SEQUENCE OF OPERATION - STANDBY WATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Standby Lag Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Standby Thermal Shock Protection Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
ALTERNATE USES FOR AUX 1 INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
ALTERNATE USES FOR AUX 2 INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
FLAME SCANNERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Installation - UV Scanners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Operation - 45UV5 & 55UV5 Self-checking UV Scanner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Wiring - UV Scanners. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Installation - Infrared Scanner Type 48PT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Operation - IR Learn. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Installation - 69ND1 Flame Rod. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
SYSTEM INFO SUB-MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
SYSTEM OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Start-up (Normal Cycle) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Normal Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Suggested Wiring Diagram for YP138 Programmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
LOCKOUT CODES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Safety Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Diagnostic Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Resetting the Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Lockout Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Lockout History Sub-menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
COMMUNICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Message Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Modbus Message Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Interlock Annunciator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Boiler Operating Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Explanation of Logstat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
OPERATIONAL FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4-20 Ma Test Jacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Check-run Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
OPERATIONAL TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Test Checkout Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Suggested Grounding Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
CB120Z PROGRAMMING / SETUP GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

4750-271
CB120Z SPECIFICATIONS
Control:
Supply Voltage:
120 VAC (+10%, -15%) 50/60 Hz
Power Consumption:
25 VA
Temperature Rating:
-40°C (-40°F) to +60°C (140°F)
Protection Category:
Control NEMA 1 (IP01)
Display, Remote mounted NEMA, 4X (IP66)
Unit Dimensions:
Wiring base 60-2850-1: - 4.0" (101 mm) W x 5.0" (127mm) H
Wiring Base 60-2852-1, 60-2854-1: - 4.0" (101 mm) W x 7.0" (178 mm) H
Shipping Weight:
Approx. 3.2 lbs. (1.45kg)
Temperature Sensors:
Temperature Measurement Range:
TS350-X: 32°F to 350°F (0°C to 176°C)
TS752-X: 32°F to 752°F (0°C to 400°C)
RTD Type: Platinum, 100 ohms +-0.1% @32°F (0°C)
Temperature Coefficient: .00385 ohms/ohms/C
Output: 4-20 mA, linear with temperature
Operating Temperature Range: -13°F to 185°F (-25°C to 85°C)
Accuracy: +- 0.75% of span
Thermowell Case: 300 Series stainless steel
Mechanical Fittings: 1/2-14 NPT
Pressure Sensors:
Pressure Measurement Range: 0 to 15, 0 to 30, 0 to 200, 0 to 300 psig
Excitation Voltage: 9-30Vdc (supplied by CB120Z control)
Accuracy: +/- 0.25% Full Scale (at constant temperature)
Output: 4-20 mA, linear with pressure
Maximum Over Pressure: 200% of full scale
Maximum Burst Pressure: 800% of full scale
Operating Temperature Range: -40°F to 185°F (-40°C to 85°C)
Fitting: 1/4" NPT Male
Electrical: 1/2" Conduit and Terminal Strip

750-271 5
OPERATING TEMPERATURE LIMITS
LOAD RATINGS:
Combination of fuel and igniter terminals
Composition of each combination
Maximum connected load not to exceed 2000 VA
COMPONENT MAXIMUM MINIMUM
Chassis/amplifier 140°F 60°C -40°F -40°C
Programmers 140°F 60°C -40°F -40°C
833-3905 VFD Display 140°F 60°C -40°F -40°C
833-3906 LCD Display 140°F 60°C -4°F -20°C
Scanner UV 200°F 93°C -40°F -40°C
Scanner IR 140°F 60°C -40°F -40°C
Flame Rod (Tip 2460°F) 1500°F 816°C -40°F -40°C
Temperature Transducers 185°F 85°C -13°F -25°C
Pressure Transducers 185°F 85°C -40°F -40°C
Humidity: 90% R.H. (Non-condensing)
Terminal Typical Load A. Maximum Rating
@120V-50/60 Hz B. Maximum Rating @230V-50/60 Hz C. Alternate Rating
M Burner/Blower Motor 9.8 F.L.A. *
58 L.R.A. 4.0 F.L.A. * 20 L.R.A. 240 VA Pilot Duty (Motor Starter Coil)
10-11-12-X Modulator 125 VA Pilot Duty
A Alarm 50 VA Pilot Duty
Terminal ratings may be selected from either column A or C for 120 VAC or from either column B or C for 30 VAC:
(select the rating from the column which best applies to the connected load on that terminal).
* F.L.A. = full load amps; L.R.A = locked rotor amps
Combination No. Pilot Fuel
Trm 6 Main Trm 7 Ignition Trm 5 Delayed Valve Trm W
1C E No Load No Load
2B E No Load No Load
3No Load E No Load B
4EEANoLoad
5No Load E A E
6DEANoLoad
7D DAD
8No Load D A No Load
AB C D E
4.5A Ignition
@120 VAC 50 VA Pilot Duty
plus 4.5A igni-
tion@ 120 VAC
180 VA Ignition plus
motor valves with:
660 VA inrush, 360
VA open, 250 VA
hold.
2A Pilot Duty
@120 VAC
65 VA Pilot Duty plus
Motor valves with:
3850 VA inrush, 700
VA open 250 VA hold.
2.2A Ignition
@230 VAC 50 VA Pilot Duty
plus 2.2A ignition
@230 VAC
1A Pilot Duty
@230 VAC

6750-271
ELECTRICAL RATINGS
VA ratings (not specified as pilot duty) permit the connection of transformers and similar devices
whose inrush current is approximately the same as their running current.
VA Pilot Duty ratings permit the connection of relays, solenoid valves, lamps, etc. whose total oper-
ating load does not exceed the published rating and whose total inrush current does not exceed 10
times the rating.
Running and locked rotor ratings are intended for motors. VA and VA Pilot Duty loads may be added
to a motor load provided the total load does not exceed the published rating.
APPROVALS
Underwriters Laboratories Inc.:
MCCZ File MP1537
Controls, Primary Safety - Listed
MCCZ2 File MP1537
Controls, Primary Safety - Component
MCCZ7 File MP1537
Controls, Primary Safety Certified for Canada
MCCZ8 File MP1537
Controls, Primary Safety Certified for Canada - Component
Factory Mutual: FM Class 7610
Acceptable by: Industrial Risk Insurers (I.R.I.)
CE: Gas Appliances
Gas Appliance Directive: 90/396/EEC
Low Voltage Directive: 73/23/EEC
EMC Directive: 89/336/EEC
GASTEC: 0063BT1754
(EN298, 2003; EN230, 2005)
DVGW Reg. No. NG-2510BT0347
DIN-CERTCO: Reg. No. 5F233/08
CAUTION: Published load ratings assume that no contact be required to handle inrush cur-
rent more often than once in 15 seconds. The use of control switches, solenoid, relays, etc.
which chatter will lead to premature failure. It is important to run through a test operation
(with fuel shut off) following the tripping of a circuit breaker, a blown fuse, or any known
instance of chattering of any external current consuming devices.
WARNING: This equipment generates and can radiate radio frequency energy, and if not
installed and used in accordance with the instruction manual may cause interference to
radio communications. It has been tested and found to comply with the limits for a Class A
computing device pursuant to Subpart J of part 15 of FCC Rules, which are designed to
provide reasonable protection against such interference when operated in a commercial
environment. Operation of this equipment in a residential area is likely to cause interference
in which case the user, at his own expense, will be required to take whatever measures which
may be required to correct the interference.

750-271 7
PART NUMBERS AND APPROVALS
APPLICABLE BULLETINS
Table 1: Agency Approvals
CB120Z
Chassis/Flame Amp. Module
833-3726 (UV) XXXXXX
833-3727 (UVSC) XXXXXX
833-3728 (IR) XXXXXX
CB120Z Programmer Module
833-3901 XXX
833-3902 XXX
833-3903 XXX
833-3904 XXX
CB120Z Displays
833-3905 XXXXXX
833-3906 XXXXXX
CB120Z Wiring Bases
833-3731 XX XXX
833-3730 X XXXX
X = CERTIFICATION IN HAND
Programmers, Non-recycle Operation
750-278Programmers, Recycle Operation
Programmers, Non-modulating
Displays 750-277
Wiring base installation, 60-2850-1 133-701
Wiring base installation, 60-2854-1 133-702
Pressure/Temperature Sensors 750-279
Interlock Expansion Module YZEM-3001
APPROVED

8750-271
ORDERING INFORMATION
CB P/N CB120Z Chassis/Flame Amplifier Module
833-3726 120 VAC input with UV non self-check amplifier
833-3727 120 VAC input with UV self-check amplifier
833-3728 120 VAC input with IR auto-check amplifier
833-3729 120 VAC input with IR2 auto-check amplifier - FGR APPLICATIONS ONLY
CB P/N CB120Z Programmer Modules
833-3901 Keypad selectable parameters, non-recycle operation, modulation, open damper proving, 4 second FFRT
833-3902 Keypad selectable parameters, non-recycle operation, modulation, open damper proving, 2 second FFRT
833-3903 Keypad selectable parameters, non-recycle operation, modulation, open damper proving, indefinite pilot hold,
revert to pilot from auto, 4 second FFRT
833-3904 Keypad selectable parameters, non-recycle operation, modulation, open damper proving, indefinite pilot hold,
revert to pilot from auto, 1 second FFRT
CB P/N CB120Z Displays
833-3905 Display, 2 line X 16 characters, VFD, with cable, NEMA 4
833-3906 Display, 2 line X 16 characters, LCD, with cable, NEMA 4
CB P/N CB120Z Wiring Bases
833-3731 Pigtail wires, 4 foot long, 4"W x 5"H
833-3730 Open base with terminal block. 4"W x 7"H
CB120Z Accessories
833-3156 Kit, remote mounting, CB120Z display, 4 ft. cable, provides NEMA 4 protection
833-3157 Kit, remote mounting, CB120Z display, 8 ft. cable, provides NEMA 4 protection
833-3539 Blank display module, included with chassis

750-271 9
SCANNER SELECTION
PRESSURE/TEMPERATURE SENSORS
CB P/N DESCRIPTION USE WITH
CHASSIS
817-2261
832-1170 Infrared 3’ Replacement photo detector 833-3728
817-2262
817-2263 UV 3’ UV 6’ 833-3726
817-2124
817-4063 Self-check UV Replacement UV tube 833-3727
CB P/N DESCRIPTION
817-4480 Pressure sensor 0-15 psi
817-4481 Pressure sensor 0-30 psi
817-4482 Pressure sensor 0-200 psi
817-4483 Pressure sensor 0-300 psi
817-4484 Temp. sensor 32-350 deg F, 2” long
817-4485 Temp. sensor 32-350 deg F, 4” long
817-4486 Temp. sensor 32-350 deg F, 8” long
817-4487 Temp. sensor 32-752 deg F, 2” long
817-4488 Temp. sensor 32-752 deg F, 4” long
817-4489 Temp. sensor 32-752 deg F, 8” long

10 750-271
WIRING BASE
833-3731
PRE-WIRED
4 FOOT
COLOR CODED
FRONT VIEW
(WITH OPTIONAL DISPLAY INSTALLED)
WIRING BASE
833-3730
OPEN BOTTOM
CABINET MOUNT
CHASSIS/AMPLIFIER
120 VAC, 50/60 Hz
833-3728
833-3729
833-3726
833-3727
PROGRAMMER MODULE
833-3901
833-3902
833-3903
833-3904
DISPLAY MODULE
833-3905 - VACUUM FLUORESCENT
833-3906 - LIQUID CRYSTAL
(WITH OPTIONAL PROGRAMMER AND DISPLAY INSTALLED)
SIDE VIEW

750-271 11
INSTALLATION PROCEDURE
WIRING BASE
Install the wiring base where the relative humidity never reaches the saturation point. The CB120Z
system is designed to operate in a maximum 90% relative humidity continuous, non-condensing
environment. Do not install the CB120Z system where it can be subjected to vibration in excess of
0.5G continuous maximum vibration. The CB120Z system is not a weather tight enclosure. The
standard vertical position is recommended. Allow at least one inch clearance around the control for
service and installation.
1. Wiring must comply with all applicable codes, ordinances and regulations.
2. Wiring must comply with NEC Class 1 (Line Voltage) wiring.
3. Limits and interlocks must be rated to simultaneously carry and break current to the ignition
transformer, pilot valve and main fuel valve(s).
4. Recommended wire routing of lead wires:
a. Do not run high voltage ignition transformer wires in the same conduit with any other
wires.
b. Do not route flame detector lead wires in conduit with line voltage circuits. Use separate
conduit where necessary.
5. Maximum wire lengths:
a. The maximum lead wire length is 200 ft. (61 meters) to terminal inputs (Operating limits,
interlocks, valves, etc.).
b. Flame Detector lead wires: see section on flame scanners
c. Remote reset: The maximum length of wire is 500 feet (152 meters) to a normally open
remote reset push-button, but should remain within sight and sound of the burner.
d. Modbus communications: The maximum cable length of wire is 3300 feet (1000 meters)
for RS-485.
A good ground system should be provided to minimize the effects of AC quality problems. A prop-
erly designed ground system meeting all the safety requirements will ensure that any AC voltage
quality problems, such as spikes, surges and impulses have a low impedance path to ground. A low
impedance path to ground is required to ensure that large currents involved with any surge voltages
will follow the desired path in preferences to alternative paths, where extensive damage may occur
to equipment.
Select either the pre-wired wiring base (833-3731) or terminal block style (833-3730). Either wiring
base type can be mounted on a din rail or directly mounted to the cabinet back plate. Refer to
Figure 3 for mounting dimensions.
FIGURE 1.
The location should be free from excessive vibration and within the ambient temperature rating.
HEIGHT WITH CONTROL INSTALLED IS 5.8" (147MM)

12 750-271
FIGURE 2. WIRING BASE CONNECTIONS (shown for 120 VAC)
UL does not apply to 230 VAC operations
Terminal No.
60-2852-1
60-2854-1
Wire Color
60-2850-1 Type Description Rating
L1 (Hot) Black Line voltage supply 120 VAC (+10%, -15%), 50/60 Hz
L2 (Neu-
tral) White Line voltage common
EARTH Green Ground
S1 Red/Wht Scanner Input 300 VAC, 3 mA (UV models)
15 VDC (IR models)
S2 Blu/Wht Scanner Input 300 VAC, 3 mA (UV models)
0 VDC (IR models)
A Red Output Alarm 120 VAC, 1 A pilot duty
M Brown Output Combustion Blower 120 VAC, 9.8 FLA, 58.8 LRA
3 Yellow Input Operating Control 120 VAC, 1 mA
13 Orange Input Fuel Valve End Switch,
Pre-Ignition Interlock 120 VAC, 1 mA
P Gray Input Running Interlock 120 VAC, 1 mA
D Wht/Brn Input Low Fire Start Switch 120 VAC, 1 mA
8 Wht/Gry Input Open Damper Proving Switch 120 VAC, 1 mA
W Wht/Orn Output Delayed Main Valve See Load Ratings
5 LT Blue Output Ignition / Pilot Valve See Load Ratings
6 Tan Output Pilot Valve See Load Ratings
7 Violet Output Main Fuel Valve See Load Ratings
16 DK Blue Input Lag 1 Input See description for
alternate uses
21 Pink Input Lag 2 Input
LOW VOLTAGE INPUT/OUTPUT
12 Wht/Yel Output Modulator Drive Positive 4-20mA Output
10 Wht/Red Output Modulator Drive Common
X Wht/Blue Output Temp/Pressure Source Voltage 28 vdc Nominal
11 Wht/Grn Input Temp/Pressure #1 (PCV) 4-20mA Input, Primary Control Variable
22 Wht/Vio Input Temp/Pressure #2 (AUX 1) 4-20mA Input
23 Brn/Wht Input Temp/Pressure #3(AUX 2) 4-20mA Input

750-271 13
PRESSURE AND TEMPERATURE SENSORS
1. Insure that the range of the selected pressure or temperature sensor is appropriate for the appli-
cation. See Tables.
Table 2: Pressure Sensors
Table 3: Temperature Sensors
2. Note: A general rule to follow when selecting the sensor range is that the expected value of the
monitored pressure or sensor should fall between 40-70% of the upper range of the sensor. For
example, a steam boiler maintains 20 lbs. pressure, select the BLPS-30 Pressure Sensor, with a
0-30 psig range.
3. The sensors must be located where the ambient temperature will not exceed the maximum ambi-
ent operating temperature specified for the sensor.
4. Insure that the pressure range programmed on the CB120Z Control matches the installed pres-
sure sensor.
5. Do not mount any of the sensors where they could be used as a footstep.
Installation must be performed by a trained, experienced flame safeguard technician.
MOUNTING PRESSURE SENSORS
Note: refer to Figure 3
1. The steam pressure sensors provide a 1/4" NPT female fitting for connection to the steam
header.
2. Make sure the boiler is shut down and zero steam pressure exists in the boiler vessel.
3. Disconnect power to the boiler controller so the boiler cannot sequence during installation of the
steam pressure sensor.
Part Number Sensor Type Set Point Range Cut In Cut Out Mod Range
Increment
Decrement
817-4480
0 - 15 psi
0 - 1030m
1.0 - 14.0 psi
70m - 950m
0 - 6.0 psi
0 - 410m
0.3 - 6.0 psi
20m - 410m
0.3 - 6.0 psi
20m - 410m
0.1 psi
10m
817-4481
0 - 30 psi
0 - 2070m
1.0 - 28.0 psi
70m - 1950m
0 - 6.0 psi
0 - 410m
0.3 - 6.0 psi
20m - 410m
0.3 - 6.0 psi
20m - 410m
0.1 psi
10m
817-4482
0 - 200 psi
0 - 13.8B
10 - 190 psi
0.70 - 13.0B
0 - 60 psi
0.0 - 4.1B
3 - 60 psi
0.2 - 4.10B
3 - 60 psi
0.20 - 4.10B
1.0 psi
.05B
817-4483
0 - 300 psi
0 - 20.7B
10 - 280 psi
0.70 - 19.3B
0 - 60 psi
0.0 - 4.1B
3 - 60 psi
0.2B - 4.10B
3 - 60 psi
0.2B - 4.10B
1.0 psi
.05B
Note: 1 psi = 68.94757 millibar
m = millibar
Part Number Sensor Length Sensor Type Set Point Range Cut In Cut Out Mod Range
Increment
Decrement
817-4484 2” 32º - 350ºF
0º - 176ºC
36º - 338ºF
4º - 170ºC
0º - 60ºF
0º - 60ºC
3º - 60ºF
3º - 60ºC
3º - 60ºF
3º - 60ºC
1ºF
1ºC
817-4485 4”
817-4486 8”
817-4487 2” 32º - 752ºF
0º - 400ºC
36º - 725ºF
4º - 385ºC
0º - 60ºF
0º - 60ºC
3º - 60ºF
3º - 60ºC
3º - 60ºF
3º - 60ºC
1ºF
1ºC
817-4488 4”
817-4489 8”

14 750-271
4. Always mount the steam pressure sensor above the water line of the boiler.
5. Locate the pressure sensors where the ambient temperature will not exceed 185F
6. Use only a small amount of pipe compound to seal the connection joints. Excess pipe compound
may clog the fitting and prevent proper operation of the sensor.
FIGURE 3.
7. Although the unit can withstand substantial vibration without damage or significant output
effects, it is good practice to mount the pressure sensor where there is minimum vibration.
8. A steam trap (siphon loop) must be connected between the boiler and the pressure sensor to pre-
vent boiler scale and corrosive vapors from affecting the pressure sensor element.
9. Make all pipe connections in accordance with approved standards.
10. When tightening the sensor, apply a wrench to the hex flats located just above the pressure fit-
ting. DO NOT tighten by using a pipe wrench on the housing. Do not tighten the pressure sensor
by hand.
.
MOUNTING TEMPERATURE SENSORS
The immersion style temperature sensors have a ½" NPT mounting for the 2", 4", and 8" thermowell
probes, and a ½" conduit fitting for electrical connections.
HOT WATER, STANDBY WATER TEMPERATURE
Note: Refer to Figure 3
1. Disconnect power to the boiler controller so the boiler cannot sequence during installation of the
hot water temperature sensor.
2. The thermowell must be mounted where it is always exposed to the circulation of the hot water.
3. If the water system is full, drain the system below the point where the thermowell will be
installed.
4. Tap an appropriate size fitting. (2", 4" and 8" thermowell have ½" NPT fitting).
5. Insert the appropriate thermowell (2", 4", or 8") and tighten.
6. Fill the system to check for leakage.
WARNING: The electro-mechanical high steam limit and/or high hot water temperature
MUST REMAIN in the 3-P running interlock circuit.
WARNING: Location of the temperature sensor to monitor boiler water temperature of a
steam boiler is critical. The sensor should be mounted where it is always exposed to the cir-
culation of the boiler water, not too close to a hot or cold inlet or steam coil. Consult the
boiler manufacturer for guidance on the sensor location

750-271 15
STACK TEMPERATURE
1. Use the existing well connection for the stack temperature sensor if provided by the boiler
manufacturer.
2. If no well connection is provided, select an appropriate location for mounting the temperature
sensor. Preferably as close to the boiler outlet as possible.
OUTDOOR TEMPERATURE
1. The outdoor air temperature sensor should be mounted on the outside of the building where it
will be exposed to representative air temperature, but not to direct sunlight. A sun shield may be
required.
2. Mount the temperature sensor high enough so it cannot be covered with snow, leaves, or other
debris, or be tampered with. Vents from the building should be avoided
WIRING PRESSURE AND TEMPERATURE SENSORS
1. All wiring must be in accordance with National Electrical Code and local codes, ordinances, and
regulations.
2. Sensor housing provides connection for 1/2" conduit.
3. The pressure and temperature sensors require 2 conductor, 18 gauge, shielded cable. Power lim-
ited, rated for 300V @105C. Use Belden 9318 or equivalent.
4. The shield should be connected to the earth ground terminal on the wiring base of the CB120Z
Control (Terminal #E). The shield should be taped at the sensor to avoid unintended contact
with the sensor housing.
5. All sensor wiring should be in a separate conduit. DO NOT install sensor wiring in any conduit
or junction boxes with high voltage wiring.
6. Maximum wiring distance for sensor wiring is 100 feet.
7. See following chart for wiring terminations:
WIRING FIRING RATE MOTOR
1. All wiring must be in accordance with National Electrical Code and local codes, ordinances, and
regulations.
2. For 4-20 mA motors, use 2 conductor, 18 gauge, shielded cable. Power limited, rated for 300V
@105C. Use Belden 9318 or equivalent.
3. The shield should be connected to the earth ground terminal on the wiring base of the CB120Z
Control (Terminal #E). The shield should be taped at the motor to avoid unintended contact with
the motor housing.
4. All wiring should be in a separate conduit. DO NOT install wiring in any conduit or junction
boxes with high voltage wiring.
TS350/TS752 BLPS PVC AUX1 AUX2
1 +EXC X (WHT/BLU) X (WHT/BLU) X (WHT/BLU)
2 -COM 11 (WHT/GRN) 22 WHT/VIO) 23 (BRN/WHT)
CAUTION: Disconnect power supply from the CB120Z Control before connecting wires to
prevent electrical shock and equipment damage.
CAUTION: PROGRAM AND SET-UP
The proper operation of the CB120Z System and the pressure and temperature sensors
require that the selected pressure ranges are appropriate for the application and must
match the pressure range programmed on the CB120Z Control. Insure that the range of the
selected sensor is correct for the application and pressure range matches the installed pres-
sure sensor.

16 750-271
5. Maximum wiring distance for sensor wiring is 100 feet.
BEFORE INSTALLING THE CB120Z CONTROL
INSTALLING THE PROGRAMMER MODULE
The programmer module plugs into the side of the
CB120Z chassis module and can only be installed
in one direction. DO NOT ATTEMPT TO FORCE
THE PROGRAMMER INTO THE CHASSIS.
Referring to the illustration on the right, align the
holes in the programmer housing with the posts
located within the CB120Z chassis. Push the mod-
ule into the chassis until the module is flush with
the chassis housing.
If it is necessary to remove the programmer module
from the chassis, 2 slots are provided on the top
and bottom of the programmer module housing. A
small screwdriver can be used to ‘pop’ the pro-
grammer from the chassis.
Note: The CB120Z system can only be used with 833-3901, 833-3902, 833-3903, or 833-3904 pro-
grammers. All other programmer types will cause LOCKOUT, INVALID YP TYPE to be displayed.
For installations requiring CE certification:
After installation, the equipment should be protected from general access by means of a cabinet
which is only accessible with a key or special tool and therefore a clear responsibility who replaced
the fuse. If the fuse is blown during installation or operation, the control must be sent to the manu-
facturer to check.
ELECTRICAL CHECKOUT
If either a ground or a short circuit is detected, it must be eliminated before the control is plugged
into the wiring base and power turned on.
Test the electrical field wiring for short circuits and grounds. The recommended method requires the
use of an ohmmeter set on its lowest resistance scale.
6. Touch the meter probes together and calibrate accurately to ensure a reliable test.
7. Disconnect the neutral wire (L2) from the control system at the power source. Clip one meter
test lead to the grounded green wire or to terminal E and with the other probe touch each other
terminal. At no time should the meters show continuity or read 0 ohms.
8. Reconnect the neutral wire (L2) at the power source. Remove the test probe from the grounded
terminal and reconnect it to Terminal L2 in the wiring base. With the other probe, touch each
other terminal. It is normal to obtain a resistance reading on the meter at some terminals during
this test as there are resistive loads (coils, transformers, lamps, etc.) connected whose normal
DC resistance may be less than 5 ohms. However, at no time should the test meter read zero
ohms.
WARNING: Controls require safety limits utilizing isolated mechanical contacts. Electronic
limit switches may cause erratic operation and should be avoided.
CAUTION: Ensure that electric power is turned off. Refer to SN-100 for recommended
grounding techniques.
Be aware that power to some interlocks (operating controls, air flow switches, modulating
circuits, etc.) may be derived from sources other than what is controlling the CB120Z.
Programmer
module

750-271 17
9. With CB120Z installed, measure voltage from L2 to all other terminals. Reading should be zero
on all terminals except Ll.
INSTALL CB120Z INTO WIRING BASE
The CB120Z chassis/amplifier module contains 2 screws permanently retained into the top and bot-
tom of the housing. The wiring base contains two brass inserts with recessed threads to ease the
installation. Line up the printed circuit board spacer located in the chassis/amplifier module with the
alignment tabs located in the wiring base. Firmly push thechassis/amplifier module into the wiring
base to assure the connectors mate properly. Tighten the screws into the brass inserts until snug.
REPLACEABLE FUSE
The following applies only to the CB120Z controls operating at 120 VAC, 50/60 Hz:
The chassis/amplifier modules are designed with a field replaceable fuse to protect Terminals 5, 6, 7
and W against short circuit loads or mis-wiring. In the event the fuse becomes OPEN, the display
will indicate CHECK FUSE or the CLOSE DAMPER, AUTO and IGN LED’s will light. An OPEN
or blown fuse is a result of an over current condition on Terminals 5, 6, 7, or W. The over current
condition causing the fuse to OPEN must be resolved before another attempt to apply power.
For installations requiring CE certification:
Only a CB authorized technician is allowed to replace the fuse.
All other installations:
The fuse is located on the printed circuit board containing the relays. To replace the fuse, remove
power from the system and remove the control from its wiring base. Using an appropriate tool,
remove the defective fuse and discard. Install a replacement 10 amp fuse. Re-install the CB120Z
control in accordance with the installation procedure detailed in a previous section.
CB120Z PROGRAMMER SELECTION
The functional operation, flame failure response time, purge timings, firing rate motor circuit, trial
for ignition timings, recycling function and display messages are determined by the programmer.
A chart of the most common programmers is found below.
Take note of the programming sequence chart for each programming module for the proper explana-
tion of prepurge timings.
CAUTION: Restore power for the following test.
WARNING: THE INAPPROPRIATE SELECTION OR APPLICATION OF A PRO-
GRAMMER MODULE COULD RESULT IN AN UNSAFE CONDITION HAZARDOUS
TO LIFE AND PROPERTY. The various programmer modules are interchangeable
because they plug into a common chassis. Many parameters are configurable through the
keypad display. Care should be taken to insure the proper parameters are set. Refer to the
appropriate programmer bulletin for appropriate settings. Selection of the programmer
module and setting the various parameters for a particular application should be made by a
competent professional, such as a Boiler/Burner technician licensed by a state or govern-
ment agency, engineering personnel of the burner, boiler or furnace manufacturer (OEM)
or in the performance of duties based on the information from the OEM.

18 750-271
PTFI*MTFI TIMINGS
The CB120Z system provides keypad selectable timings for both PTFI and MTFI. The selections
offered can provide 5 or 10 second timing for terminal 5 and 6 or a shortened time for terminal 5,
allowing for early spark termination. CB120Z also provides selectable interrupted or intermittent
operation for terminal 6.
The selections provided for PTFI*MTFI timings are:
Table 4:
CB PART
NUMBER Pre-purge Programming
(Seconds)
Proven
High Fire
Interlock
(M-8)
Proven
Low Fire
Interlock
(M-D)
Terminal 6,
Interrupted
or
Intermittent
Early Spark
Termination PTFI (5/6) MTFI (5/6) Running Interlock
(3-P)
Flame
FailTime
(Seconds
)
Firing
Rate
Motor
SETTINGS SHOWN ARE FACTORY DEFAULT
833-3901 30 YES YES INTRP NO 10/10 10/15 Non-recycle 4 YES
833-3902 30 YES YES INTRP NO 10/10 10/15 Non-recycle 2 YES
833-3903 30 YES YES INTRP NO 10/10 10/15 Non-recycle 4 YES
833-3904 30 YES YES INTRP NO 10/10 10/15 Non-recycle 1 YES
SELECTION PTFI MTFI COMMENT
Term 5 Term 6 Term 5 Term 6
10/10*10/15 10 10 10 15
5/5*0/10 5 5 0 10 NO SPARK DURING MTFI
5/5*0/5 5 5 0 5 NO SPARK DURING MTFI
5/5*10/15 5 5 10 15 SHORTENED PTFI
5/5*10/10 5 5 10 10 SHORTENED PTFI
5/10*0/15 5 10 0 15 EARLY SPARK TERMINA-
TION
5/10*0/10 5 10 0 10 EARLY SPARK TERMINA-
TION
10/10*0/10 10 10 0 10 NO SPARK DURING MTFI
10/10*0/5 10 10 0 5 NO SPARK DURING MTFI
10/10*10/10 10 10 10 10

750-271 19
LED INDICATOR LIGHTS
The CB120Z control module has seven (7) LED indicator lights to annunciate the operating status of
the control, as well as provide the reason for the last lockout condition. The “Open Damper” and
“Close Damper” LED's provide easy set-up of the modulating motor end switches. Each LED has a
graphic symbol to describe its function (see Table 5 ).
Table 5:
FAN Lights when the blower motor is energized (terminal M) and flashes when the RUN/
CHECK switch is in the “CHECK” position during Purge, PTFI, MTFI and AUTO.
OPEN
DAMPE
R
Will blink when the modulator motor is being driven to the high fire position. (circuit 10-X
made). Once the high purge switch closes (M-8), this LED will light constant. This LED
provides the status of the high fire purge interlock circuit (M-8). This LED lights anytime
the M-8 circuit closes during Prepurge, PTFI, MTFI, Post Purge.
CLOSE
DAMPE
R
Will blink when the modulator motor is being driven to the low fire position (circuit 10-12
made). Once the low fire switch closes (M-D), this LED will light constant. This LED pro-
vides the status of the low fire start interlock circuit (M-D). This LED lights anytime the
M-D circuit closes during Pre-purge, PTFI, MTFI, post purge.
AUTO Will light when the control releases to automatic modulating control (circuit 10-11 made).
IGNITIO
N
Will blink during Pilot Trial For Ignition (PTFI). Will light constant during Main Trial For
Ignition (MTFI).
FLAME Will light whenever flame is detected by the flame scanner.
ALARM In the event of a lockout condition, the Alarm LED will blink, the remaining LED's will
light up to indicate the lockout condition. See “Safety Lockout Codes.”

20 750-271
DESCRIPTION OF FUNCTIONS OF OPERATING CONTROLS
1. Operating Controls: Generally pressure or temperature activated, the operating control closes,
causing the burner start-up sequence to begin. When the operating control opens, the burner
shuts off. The operating control is connected in the L1-3 circuit on the wiring base.
2. Limit Switches: These are generally pressure, water level or temperature activated
a. Recycle — when it is desired to stop the burner when the limit switch opens and restart it
when the limit switch recloses, they are connected between Terminals L1 and 3.
b. Non-Recycle —when it is necessary to stop the burner when the limit switch opens and pre-
vent it from starting until both the limit switch recloses and the manual reset is activated, they
are connected between terminals 3 and P.
3. Fuel Valve End Switch Interlock: This is generally an integral switch mounted on the main
fuel valve and activated by the valve stem. It is connected between Terminal L1 & 13. The fuel
valve end switch interlock prevents a burner start-up if the valve stem is not in the “valve
closed” position. This interlock must remain closed while in STANDBY and until the start of
PTFI.
4. Purge Interlock: Generally a firing rate motor linkage position switch or a differential air-pres-
sure switch, that proves a maximum purge air flow rate. It is connected between Terminals M
and 8. The purge interlock proves that the air damper is fully open and purge air flow rate is at
maximum during the purge.
5. Running Interlocks: These generally are air flow switches, high and low fuel pressure
switches, oil temperature switches, atomizing media pressure switches, and excess smoke den-
sity controls. These interlocks prove proper conditions for normal operation of the burner. They
are wired in series and connected between Terminals 3 and P.
6. Low Fire Start Interlock: Generally a firing rate motor linkage position switch or a damper
position switch, will prove both the linkage and dampers are in their proper positions to begin
burner light off. This switch is connected between Terminals M and D.
SETTING PROGRAMMER PARAMETERS
In order to change the factory default parameters stored in the programmer module an optional key-
pad/display (833-3905 or 833-3906) is required. All configurable parameters are stored within the
PROGRAM SETUP sub-menu. The keypad/display module provides tactile feedback keys that are
used to access the sub-menus inherent in the CB120Z system.
The CB120Z display consists of 2 lines having 16 characters per line. The default displayed item is
the current operating status. This would include the current point in the burner sequence followed by
the parameter pertaining to that point in the sequence, such as time or the flame signal level. The bot-
tom line is used to display the current operating status. The CB120Z display also provides the histor-
ical information stored in the control’s memory such as burner hours, cycles, lockouts and system
hours. The remainder of the display items are menus with sub-menus indicated by a right facing
arrow. The sub-menus indicate the current value of the selected item and in some cases can be modi-
fied to suit the application.
All programmed safety times and interlock configuration settings become permanent after
8 hours of main burner (Terminal 7) on time. (This does not apply to Boiler Parms).
STANDBY
PROGRAM SETUP >