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Adobe page numbers may differ from document page numbers for documents with two-page spreads (such as wiring diagrams that span pages).) LGBGas–fired boiler Control Supplement Flame Guardian WMBC-1A RM7895C Controller Electronic Pilot System IRI Contents I. Installation ..................... 2 II. Gas piping ...................... 5 III. Wiring ............................. 5 IV.Startup ......................... 10 V. Sequence of operation 11 VI.Parts list ....................... 12 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/service technician. Read these instructions completely before beginning the installation. Failure to follow these instructions can cause severe personal injury, death or substantial property damage. Part Number 550-141-807/0298 LGB (Series 2) — Control Supplement I Installation 1. For use with LGB-6 through 12 boilers. 2. LOCAL INSPECTOR MUST CERTIFY BOILER FOR IRI COMPLIANCE. 3. Assemble pilot burner and flame sensor to main burners with pilot brackets. See Figures 2 and 3. Install ground wiring as shown in Figures 2 and 3. 4. Reinstall burner assemblies. See Table 1 for pilot burner and flame sensor locations. 5. Assemble control panel to boiler. See Figure 1. 6. Install gas controls as shown in Figure 4, page 4. 7. IRI installations require manual reset controls. Weil-McLain recommends installing manual controls in addition to standard as required by local inspector. Refer to the LGB Boiler Manual,“Boiler Controls” section. a. Steam boilers require a manual reset Low Water Cutoff and manual reset Pressure Limit Control. b. Water boilers require a manual reset Low Water Cutoff and manual reset Temperature Limit Control. Table 1 Pilot burner and flame sensor locations Figure 1 Mount control panel to jacket as shown Boiler Model Flame Sensor * Pilot Burner * LGB-6 2 9 LGB-7 2 11 LGB-8 2 13 LGB-9 2 15 LGB-10 2 16 LGB-11 2 16 LGB-12 2 16 * From left burner. Front of Boiler Panel Drill (7) 1/8“ Holes In Jacketto MountBracketDrill (7) 1/8“ Holes In Jacket to Mount Bracket Drill (3) Holes in Front Drill (4) Holes in SideDrill (4) Holes in Side 55BGL Part Number 550-141-807/0298 Flame Guardian WMBC-1A Electronic Pilot System – IRI I Installation – continued Sensor Q179 Pilot 10-32 x 5/16“Figure 2 Machine Screws(2) Q179 pilot burner assembly Ground Leadwire: Connect to WMBC Panel Terminal G2 (Ground Terminal) Pilot Mounting Bracket Locating Slot Igniter Burner Compression Sensor Lead Burner Support Bar Pilot Line Tubing 10-32 x 1/4“ Machine Screws (2) Main Burner (with Pilot Mounting Bracket) LGB-A56 Igniter Lead Union Locating Slot Flame Sensor Sensor Lead Burner Support Bar 10-32 x 5/16“ Machine Screws(2) 6-32 x 5/16“ Type ”F” Figure 3 Self Tapping Screws(2) Main flame sensor assembly Ground Leadwire: Connect to Main Flame Proving Module 24 V (GND) terminal Flame Sensor Mounting Bracket Main Burner (with Pilot Mounting Bracket) LGB-A85 Part Number 550-141-807/0298 LGB (Series 2) — Control Supplement I Installation – continued Figure 4 IRI gas train schematic 1613151718181412111097654321Boiler Jacket Vent to OutsideAtmosphere Drip Leg Service Valve 8 GAS PIPING DIAGRAM -LGB (Series 2) IRI Gas Train 1 Manual main shut-off gas valve 2 Low gas pressure switch 3 Pilot manual shut-off valve 4 Motorized gas valve w/ on/off actuator 5 Pilot gas pressure regulator 6 Normally open solenoid vent valve 7 Pilot solenoid gas valve 8 Test cock 9 Second motorized gas valve w/ on/off actuator 10 Manual leak checking gas valve 11 Regulating diaphragm gas valve (two stage) 12 High gas pressure switch 13 Main flame sensor 14 Main burner with main flame sensor bracket 15 Pilot burner 16 Main burner with pilot burner bracket 17 Adapter, for N. O. vent valve 18 Pipe flanges Part Number 550-141-807/0298 Flame Guardian WMBC-1A Electronic Pilot System – IRI II Table 2 Natural gas supply pipe sizing III Gas piping 1. Size gas piping considering: a. Diameter and length of gas supply piping. b. Number of fittings. c. Maximum gas consumption (including any possible future expansion). d. Allowable pressure drop from gas meter outlet to boiler. For pressure drops, see ANSI-Z223.1 – latest edition. 2. Size natural gas piping from table below. Size piping to provide proper inlet pressure to gas valve when operating at rated input. a. Inlet gas pressure to manual main shutoff gas valve minimum 7” W.C. standard (5.” on special order) – maximum 13”W.C. b. If pressure to gas valve exceeds 13”W.C., install positive dead-end lockup gas pressure regulator up stream of hand valve. c. To obtain approximate cubic feet per hour, divide input (BTU/HR) by 1000. 3. Remove gas supply knockout disc from jacket panel. 4. Follow good piping practices. 5. Pipe joint comp...