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Weil-McLain 78 manual

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Table of contents for the manual

  • Page 1

    This manual must only be used by a qualified heating installer/service technician . Failure to comply could result in severe personal injury , death or substantial property damage. Part No. 550-141-705/0600 78 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Boiler Manual • Installation • Start-Up • Maintenance • Parts Installer: L[...]

  • Page 2

    Part No. 550-141-705 W eil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Contents 1. Before Installing Boiler .............................................................. page 3 2. Set Packaged Boiler or Block Assembly in Place ................ page 5 3. Assemble Block ...........................................................[...]

  • Page 3

    • Installation • Start-Up • M aintenance • Pa r t s Befor e Installing Boiler 1a Installation must comply with: • State, provincial and local plumbing, heating and electrical codes. • Regulations of serving utilities. • National codes where applicable. Before selecting boiler location: • Check for nearby connections to: – fuel sup[...]

  • Page 4

    W eil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Befor e Installing Boiler 1b Provide clearances for servicing around boiler: • Back, for breeching - 30 inches. • Left side, for cleaning and tankless heater removal - 34 inches • Allow sufficient space on remaining sides for cleaning, servicing and burner installation. Se[...]

  • Page 5

    • Installation • Start-Up • M aintenance • Pa r t s Set Packaged Boiler or Block Assembly in Place 2a For packaged boiler: 1. Remove top jacket panel. Set aside until after boiler is piped. 2. Remove lag screws (2 in front, 2 in rear) from shipping rails. 3. Remove boiler from skid. Cables are already attached to block assembly . See Liftin[...]

  • Page 6

    W eil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Assemble Block 3a Sections are top heavy . Unbolted sections may fall if not supported, resulting in severe personal injury or death. Install back refractory blanket: 1. Lay back section on floor with ports face up. 2 Apply water glass as an adhesive to blanket. 3. Press blanket[...]

  • Page 7

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  • Page 8

    Prepare remaining sections: 1. Follow “Prepare intermediate section” for remaining intermediate and front sections: a. Remove any grit from threads inside tapped holes with clean rag. Do not use petroleum-based cleaning or sealing compounds in boiler system. Severe damage to system components can result, causing substantial property damage. b. [...]

  • Page 9

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  • Page 10

    W eil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Assemble Block 3e Prepare flue collector hood assembly: Make sure gaskets are intact, not torn or otherwise damaged. These conditions can cause possible flue gas leakage and carbon monoxide emissions, resulting in severe personal injury or death. 1. Stand one collector hood modu[...]

  • Page 11

    • Installation • Start-Up • M aintenance • Pa r t s Assemble Block 3f Install flue collector hood assembly: 1. Place hood on top of sections with open end of hood tightly against flue collar . Make sure flue collar gasket is in place, not broken, bent or folded. 2. Install 5/16" x 2" carriage bolts, flat washers and regular nuts o[...]

  • Page 12

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  • Page 13

    General water piping information: • System water supply and return piping should be installed and piping connections attached to boiler before erecting jacket or installing controls. • Do not pipe in through supply and out through return. This creates reverse water flow through boiler that must not be used. • When three-way valves are used fo[...]

  • Page 14

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  • Page 15

    • Installation • Start-Up • M aintenance • Pa r t s Connect Steam Boiler Piping 6a General steam piping information: • Hartford Loop piping arrangement and wet return are required for steam boilers. • Maintain 24-inch minimum from waterline to bottom of header (56-1/4" from bottom o f section). • When using condensate receiver, f[...]

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  • Page 24

    W eil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Install Bur ner 12a Wiring and Fuel Piping 13a T o install burner: 1. Unpack burner . 2. Place gasket around air tube and against burner mounting flange. If sealing rope is used, apply 1/8" continuous bead of rope adhesive around burner mounting flange and apply sealing rop[...]

  • Page 25

    • Installation • Start-Up • M aintenance • Pa r t s Make Final Adjustments 14a T o fill water boilers: 1. Close manual air vents and drain cocks. 2. Fill to correct system pressure. Correct pressure will vary with each installation. 3. Starting on lowest floor , open air vents one at a time until water squirts out. Close vent. Repeat with r[...]

  • Page 26

    W eil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Make Final Adjustments 14b Skim steam boilers: Clean all newly install steam boilers to remove oil. Failure to properly clean can result in violent water level fluctuations, water passing into steam mains, or high maintenance costs on strainers, traps and vents. Skim boiler only[...]

  • Page 27

    • Installation • Start-Up • M aintenance • Pa r t s Data and Dimensions 15a Data Dimensions Supply T appings Return T appings Quantity Quantity And Size* And Size* Boiler Model W ater Steam W ater Steam A B D E H W L 378 2 - 4" 2 - 4" 2 - 3" 2 - 3" 13-1/8 -- 8 42-1/2 13-1/2 20-3/8 21-1/2 478 2 - 4" 2 - 4" 2 - 3[...]

  • Page 28

    W eil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Data and Dimensions 15b Part No. 550-141-705 28 Front Back Side Intermediate Minimum for heater removal 3" NPT return W=Boiler section length 4" NPT supply outlets 3" NPT return W ater line[...]

  • Page 29

    • Installation • Start-Up • M aintenance • Pa r t s Part No. 550-141-705 29 Parts 16a B A C O N E G F D J K L P Q K M P I H[...]

  • Page 30

    W eil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Parts 16b Figure No. Description W-M Sales Ref. No. A Front Section (7813) 1 1B329 B Intermediate Section Regular (7815) 1 1B330 Intermediate Section Supply - Steam (7814) 1 1B331 C Intermediate Section T ankless (7816) 1 1B332 D Back Section (7818) 1 1B333 Section Assembly Kit [...]

  • Page 31

    • Installation • Start-Up • M aintenance • Pa r t s Ratings 17a Part No. 550-141-705 31 ◆ I=B=R Burner ✝ ✝ Boiler Water Capacity Net I=B=R Ratings ❏ Content Gals. Packaged ✝ ■ * * Positive Boiler * * Gross Net Stack Presure I=B=R Weight Light ❍ ■ I=B=R ■■ Firebox Gas In V ent Steam Less Oil Gas Output Steam Steam W ater [...]

  • Page 32

    Part No. 550-141-705/0600 32[...]