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These terms are used throughout this
manual to bring attention to the presence
of hazards of various risk levels or to
important information concerning the life
of the product.
LGB
Control Supplement
LGB-6
LGB-20
to
- Natural gas
CSD-1 Control System
Indicates presence of hazards that can cause severe personal injury, death
or substantial property damage.
Indicates special instructions on installation, operation or maintenance
that are important but not related to personal injury or property damage.
This Control Supplement must only be used by a qualified installer/ser-
vice technician. Read these instructions completely before beginning the
installation. Failure to follow these instructions can cause severe personal
injury, death or substantial property damage.
Gas-fired boiler
Series 2
Contents
I.
Installation .................... 2
II. Gas piping ..................... 4
IV. Wiring ............................ 5
Sequence of operation ......8
Wiring procedure ...............8
V. Leak test procedure ... 10
VII. Parts list ...................... 12
Part Number 550-141-815/1010
5
....................
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Table of Contents
Related Manuals for Weil-McLain LGB-6 Series 2
Summarization of Contents
Installation
Pilot Burner and Flame Sensor Assembly
Assemble pilot burner and flame sensor to main burners with pilot brackets.
Burner Assembly Reinstallation
Reinstall burner assemblies, referencing pilot burner and flame sensor locations.
Gas Controls and Ignition Panel Installation
Install gas controls and ignition control panel(s) according to tables and figures.
Gas Piping
Natural Gas Piping Sizing
Size natural gas piping for proper inlet pressure to the gas valve during operation.
Gas Piping Sizing Considerations
Factors for sizing gas piping: diameter, length, fittings, and maximum consumption.
Gas Piping Installation Practices
Follow good practices: pipe dope, drip leg, union, and support piping.
Gas Connection Leak Testing
Perform bubble test to check boiler and gas connections for leaks.
Water and Steam Trim Components
Water Boiler Control Requirements
Water boilers require manual reset high temp limit and low water cutoff controls.
Steam Boiler Control Requirements
Steam boilers require manual reset high pressure limit and low water cutoff controls.
Wiring
Electrical Wiring Standards
All wiring must comply with National Electrical Code and local code requirements.
Boiler Electrical Grounding
Ensure the boiler is electrically grounded per the National Electrical Code.
Wire Gauge and Conduit Requirements
Use No. 14 gauge wire or heavier and install wiring in conduit.
Dedicated Electrical Circuit
A separate circuit with a fused disconnect switch (15 amp recommended) is required.
Wiring Diagram References
Refer to Figure 3 for schematic/ladder diagrams and Figure 5 for field wiring.
Leak Test Procedure
Gas Valve Leak Test Steps
Follow detailed steps to test the main gas valve and manifold for leaks.
Interpreting Leak Test Results
Analyze pressure readings to identify potential leaks in upstream valves.
Operating Instructions
Pre-Operation Safety Warnings
Critical safety warnings for automatic pilot ignition, gas detection, and water exposure.
Boiler Startup Procedure
Step-by-step guide for safely starting the boiler, including gas and electrical checks.
Parts List
Flame Sensors and Brackets
Details for main flame sensor, sensor bracket, and pilot burner bracket.
Gas Valves and Shut-off
Part information for manual main shut-off, secondary, and main gas valves.
Control Modules and Relays
Parts list for pilot proving, main flame proving modules, and impulse relay.
Auxiliary Components
Includes push-button switch, lens cover, light bulb, pilot solenoid, and firing valve.
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