CleaverBrooks CBEX Elite

Questions and Answers

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pbrownAug 3, 2025
What to do if CleaverBrooks CBEX Elite Boiler burner does not start?
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  James SmithAug 3, 2025
  If the burner on your CleaverBrooks Boiler isn't starting, there are several potential causes to investigate. First, ensure that the main disconnect switch is not open, check for any blown control circuit fuses, and verify that all electrical connections are secure. If the program relay (flame safeguard) safety switch requires resetting, reset it. Also, check pressure or temperature settings, water level, and fuel pressure. Finally, ensure the fuel valve auxiliary switch is closed.
D
David CarrAug 10, 2025
What to do if CleaverBrooks Boiler has no ignition?
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  Christopher RodriguezAug 10, 2025
  If your CleaverBrooks Boiler has no ignition, start by checking for proper electrode setting, a grounded electrode, and ignition transformer functionality. If there's a spark but no flame, investigate for a lack of fuel or issues with the pilot solenoid. Check the damper motor, cam, and switch condition. Verify the proper setting of combustion or atomizing air proving switches. Inspect the flame detector and clean the sight tube and lens.
S
Shannon YoungAug 19, 2025
Why does my CleaverBrooks Boiler shutdown during firing?
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  David PetersonAug 19, 2025
  A shutdown during firing of your CleaverBrooks Boiler can occur due to several reasons. Check the fuel supply lines and connections to ensure there is no loss or stoppage of fuel. Inspect fuel valves for defects and tighten any loose electrical connections. Test the flame detector and replace it if necessary. Clean the lens and sight tube. If the programmer lockout switch hasn't tripped, check the limit circuit for an opened safety control. If the programmer lockout switch has tripped, inspect fuel lines and valves for issues. Adjust air/fuel ratios and inspect linkage and damper. Test and replace the interlock device if defective.
M
martinmaloneAug 27, 2025
What to do if CleaverBrooks Boiler pilot flame is on, but there is no main flame?
- A
  Adam AdamsAug 27, 2025
  If your CleaverBrooks Boiler shows a pilot flame but no main flame, first check the pilot flame parameters to ensure they are sufficient. If it's a gas-fired unit, open the manual gas cock and ensure the gas valve and regulator are functioning correctly. For oil-fired units, check for obstructions, closed valves, and ensure the pump is operating. Inspect and clean the flame detector, sight tube, and lens. Verify voltage at the main fuel valve circuit terminal.

Summary

Chapter 1 Basics

1.2 The Boiler Construction

1.4 Steam Controls and Components

Explains steam controls like pressure gauge, operating limit, and high limit controls.

1.5 Hot Water Controls and Gauges

Details pressure/temperature gauges and controls specific to hot water boilers.

Chapter 2 Burner and Fuel System

2.1 The Burner System

Describes the oil and gas burner types, ignition, and safety controls.

2.2 Front Head and Control Panel

2.3 Gas System Components

Explains the components of the gas flow control system (gas train).

2.4 Oil System Components

Lists components relevant to oil-fired or combination fired boilers.

2.6 Combustion Air System

2.7 Automatic Ignition Sequence

Details the process of automatic ignition using a pilot flame.

2.8 Atomizing Air for Oil Firing

2.10 Gas Fuel Flow

Chapter 3 Waterside Care

3.2 Water Requirements

Covers general water requirements for steam and hot water boilers.

3.3 Water Treatment Objectives

Details the goals of water treatment to prevent scale, corrosion, and foaming.

3.4 Cleaning Procedures

Describes cleaning methods for steam/water piping and the pressure vessel.

3.5 Boil-Out of a New Unit

3.7 Steam Boiler Blowdown

Explains types, frequency, and procedures for steam boiler blowdown.

3.8 Periodic Waterside Inspection

Chapter 4 Sequence of Operation

4.2 Boiler Circuits and Interlocks

Lists and describes the various electrical circuits and interlock components.

4.3 Firing Rate Controls

Explains the primary subsystems for modulating firing and burner sequencing.

4.4 Sequence of Operation: Gas or Oil

Details the operational sequence for gas or oil firing, including pre-purge.

4.5 Flame Loss Sequence

Describes the sequence of events and safety shutdowns upon flame loss.

Chapter 5 Starting and Operating Instructions

5.1 General Startup Preparation

Covers essential preparations before initial boiler startup for all fuels.

5.2 Control Settings for Steam and Hot Water

Details how to set operating limit and high limit controls for proper function.

5.3 Gas Pilot Adjustment and Checks

Explains how to check and adjust the gas pilot flame for satisfactory performance.

5.4 Atomizing Air Pressure Check

5.5 Firing Preparations for No. 2 Oil

Outlines specific preparations required before firing light oil.

5.6 Firing Preparations for Gas

Details the necessary preparations before firing natural gas.

5.7 Startup, Operation, and Shutdown

Covers the complete process of starting, operating, and shutting down the boiler.

5.8 Control Operational Checks

Describes how to perform operational checks on various boiler controls.

Chapter 6 Adjustment Procedures

6.2 Burner Operating Controls: General

6.3 Operating Limit Pressure Control Adjustment

Details how to set the 'cutout' and 'cut-in' pressures for the operating limit control.

6.4 High Limit Pressure Control Adjustment

Explains how to set the high limit pressure control for safety.

6.5 Operating Limit Temperature Control Adjustment

Describes setting the operating limit temperature control for hot water boilers.

6.6 High Limit Temperature Control Adjustment

Details setting the high limit temperature control for hot water boilers.

6.8 Combustion Air Proving Switch Adjustment

6.9 Atomizing Air Proving Switch Adjustment

6.10 Gas Pilot Flame Adjustment

Provides guidance on adjusting the gas pilot flame size and signal.

6.11 Gas Pressure and Flow Information

Covers gas pressure requirements and flow calculations for proper input.

6.13 Low Gas Pressure Switch Adjustment

6.14 High Gas Pressure Switch Adjustment

6.15 Burner Drawer Adjustment

Chapter 7 Troubleshooting

7.1 Problem-Cause Suggestions

Lists common burner problems and their potential causes for diagnosis.

Chapter 8 Inspection and Maintenance

8.1 Overview of Inspection and Maintenance

8.1.1 Recommended Boiler Inspection Schedule

Provides a schedule for daily, monthly, semi-annual, and annual inspections.

8.2 Fireside Cleaning Procedures

8.3 Water Level Controls Maintenance

Stresses the critical need to check water level controls and waterside conditions.

8.4 Water Gauge Glass Maintenance

8.5 Electrical Controls Inspection

8.6 Flame Safety Control Maintenance

8.7 Oil Burner Maintenance

8.8 Gas Burner Maintenance

8.10 Solenoid Valve Maintenance

8.11 Air Control Damper Checks

8.12 Fan;Motor Cassette Removal

8.13 IFGR Inspection and Adjustment

8.14 Fan;Motor Cassette Installation

8.15 Safety Valves Inspection

8.16 Fuel Oil Metering Valve Maintenance

8.17 Air Pump and Lubricating System

8.18 Refractory Inspection and Maintenance

8.19 Front Door and Rear Access Plug

8.21 Combustion Adjustments

CleaverBrooks CBEX Elite Specifications

General

Model	CBEX Elite
Manufacturer	Cleaver-Brooks
Category	Boiler
Type	Firetube
Application	Commercial, Industrial
Fuel Type	Natural Gas, Oil
Efficiency	Up to 85%
Construction	Welded
Emissions	Low NOx options available