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Part Number 550-141-916/1001
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2 Part Number 550-141-916/1001
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3 Part Number 550-141-916/1001
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LGB-6 to LGB-23 Series 2 – Control Supplement II 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. Canadian installations must comply with B149.1 or B149.2 Installation Code. 2. Size natural gas piping from Table 3, below. Size piping to provide proper
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Universal Control System – Natural gas III Wiring For your safety, turn off electrical power supply before making any electrical connections to avoid possible electrical shock hazard. 1. All wiring must be installed in accordance with the requirements of the National Electrical Code and any additional national, state or local code requirements having jurisdiction. All wiring must be N.E.C. Class 1. 2. The boiler must be electrically grounded in accordance with the National Electrical Code, ANSI
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LGB-6 to LGB-23 Series 2 – Control Supplement III Wiring – continued SCHEMATIC WIRING DIAGRAM STEAM WATER LIMIT CIRCUIT LIMIT CIRCUIT HIGH OPERATING LOW WATER LIMIT LOW WATER CONTROL CUT-OFF CONTROL CUT-OFF MAIN FLAME PILOT PROVING PROVING MODULE MODULE MV MV (NOTE 7) MV/PV MV/PV PV PV TEMPERATURE GND (BURNER) GND (BURNER) (NOTE 8) G G OPERATING/LIMIT COMBINATION 24V (GND) 24V (GND) CONTROL THESE TERMINALS 24V 24V JUNCTION TO BE JUMPERED MAIN FLAME BOX WHEN L.W.C.O. IS SENSOR (NOTE 7) WIRE NUTS
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Universal Control System – Natural gas EQUIPMENT Figure 3 LADDER WIRING DIAGRAM H N GROUND 120 V.A.C. (NOTE 10) Wiring diagram HIGH SERVICE SWITCH OPERATING LOW WATER LIMIT (BY OTHERS) CONTROL CUT-OFF CONTROL PRIMARY R C 24 V.A.C. PRIMARY R 24 V.A.C. MAIN GAS VALVE HIGH FIRE FIRING RATE CONTROL (WHEN USED) OPERATOR (NOTE 6) MV MV MV/PV MV/PV MAIN GAS VALVE LOW FIRE OPERATOR PV PV MV/PV GND (NOTE 6) (BURNER) PV MV/PV 24V SECONDARY GAS VALVE (GND) 24V MAIN FLAME SENSOR SENSE SPARK NO. 1 BASE MV MA
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LGB-6 to LGB-23 Series 2 – Control Supplement III Wiring – continued Wiring Procedure 1. Determine right or left electrical supply wiring. 2. Attach electrical junction box(es) to inside jacket end panel. Screws and nuts are provided. For dual base boilers, use offset nipples (provided) to connect junction boxes together, then hang junction boxes by screwing top box to boiler jacket. See Figure 4, below. 3. Attach control transformer(s) to junction box(es). 4. Drill 1/8" hole in interior jacket
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Universal Control System – Natural gas IV Operating instructions Part Number 550-141-916/1001 9
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LGB-6 to LGB-23 Series 2 – Control Supplement V Verification testing Before starting boiler for the first time and at least annually (during annual inspection and start-up), follow the procedures below to verify boiler controls are operating correctly and that automatic gas valve properly shuts off gas flow. Failure to verify boiler operation could result in severe personal injury, death or substantial property damage. Manual test firing This boiler is equipped with a manual test firing valve —
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Universal Control System – Natural gas VI Parts list – continued Figure 5 Parts drawing 8 9 7 12 14 3 4 5 11 13 10 1 6 2 91601 Part Number 550-141-916/1001 11
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LGB-6 to LGB-23 Series 2 – Control Supplement Weil-McLain 500 Blaine Street Michigan City, IN 46360-2388 http://www.weil-mclain.com 12 Part Number 550-141-916/1001
