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Weil-McLain LGB-20 Control Supplement

Series 2 – natural gas
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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
Wiring procedure ...............8
VII. Parts list ...................... 12
Part Number 550-141-815/1010
5
....................

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Table of Contents
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  Summary of Contents for Weil-McLain LGB-20

  • Page 1: Table Of Contents

    Gas–fired boiler Control Supplement LGB-6 LGB-20 – 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.
  • Page 2: Installation

    LGB-6 to LGB-20 Installation 1. Assemble pilot burner and flame sensor to main burners with pilot brackets. See Figures 2. Reinstall burner assemblies. See Table 1, below for pilot burner and flame sensor loca- 3. Install gas controls and ignition control panel(s) as shown in Table 2, below and Figure Table 1 Pilot burner and flame sensor...
  • Page 3 CSD-1 Control System - Natural gas Installation Figure 1 Pilot burner assembly, typical Figure 2 Main flame sensor assembly Part Number 550-141-815/1010 – continued...
  • Page 4: Gas Piping

    LGB-6 to LGB-20 Gas piping 1. Size natural gas piping from Table 3, below. Size piping to provide proper inlet pressure 2. Size gas piping considering — 3. Remove knockout disc from jacket panel through which gas supply will be piped.
  • Page 5: Water And Steam Trim Components

    CSD-1 Control System - Natural gas Water and steam trim compo nents 1. Install water or steam trim components as required by CSD-1 latest edition. See the Wiring 1. All wiring must be installed in accordance with the requirements of the National 2.
  • Page 6 LGB-6 to LGB-20 Series 2 – Control Supplement Part Number 550-141-815/1010...
  • Page 7 CSD-1 Control System - Natural gas Figure 3 Wiring diagram Part Number 550-141-815/1010...
  • Page 8: Sequence Of Operation

    LGB-6 to LGB-20 Wiring Sequence of operation 1. Operating control begins startup sequence. a. Limit control contacts are closed. 2. Pilot proving module energized. a. Pilot solenoid opens. b. Pilot ignition spark begins. c. Pilot ignites. d. Pilot proves. 3. Main flame proving module energized from pilot proving module.
  • Page 9 CSD-1 Control System - Natural gas Figure 5 Field wiring diagram Part Number 550-141-815/1010...
  • Page 10: Leak Test Procedure

    LGB-6 to LGB-20 Leak test procedure 1. Remove red (MV) and blue (PV) wires from main gas valve. 2. Close main test firing valve attached to the manifold. 3. Check that both leak test valves are closed and remove plugs.
  • Page 11: Operating Instructions

    CSD-1 Control System - Natural gas Operating instructions Starting boiler 1. STOP! Read the safety information above. 2. Set the Operating control to lowest setting. 3. Turn off all electrical power to the appliance. 4. Remove Front panel. 5. This appliance is also equipped with an ignition device which automatically lights the 6.
  • Page 12: Parts List

    LGB-6 to LGB-20 Series 2 – Control Supplement Parts list Figure 6 Part Number 550-141-815/1010...