Weil-McLain 78 Manual
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Weil-McLain 78 Manual

Boiler for gas, light oil, gas/light oil fired burners
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All manuals and user guides at all-guides.com
78
78
Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners
Boiler Manual
• Installation
• Start-Up
Installer: Leave all documentation received with boiler and burner
with unit for future reference.
User:
Boiler and burner must be installed and serviced by a
qualified service technician.
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.
• Maintenance
• Parts
Part No. 550-141-705/0600

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Summary of Contents for Weil-McLain 78

  • Page 1 All manuals and user guides at all-guides.com Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Boiler Manual • Installation • Maintenance • Start-Up • Parts Installer: Leave all documentation received with boiler and burner with unit for future reference. User: Boiler and burner must be installed and serviced by a qualified service technician.

  • Page 2: Table Of Contents

    All manuals and user guides at all-guides.com Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Contents Before Installing Boiler.............. page 3 Set Packaged Boiler or Block Assembly in Place....page 5 Assemble Block................page 6 Perform Hydrostatic Pressure Test........page 12 Connect Water Boiler Piping..........

  • Page 3: Before Installing Boiler

    All manuals and user guides at all-guides.com • Installation • Start-Up • Maintenance • Parts Before Installing Boiler Installation must comply with: Opening sizes must comply with state, provincial or local codes. In their absence, use the following • State, provincial and local plumbing, when boiler is in a confined room: heating and electrical codes.
  • Page 4 All manuals and user guides at all-guides.com Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Before Installing Boiler Provide clearances for servicing Lay a foundation, if needed: around boiler: Floor construction and condition must be suitable for weight of boiler when filled with •...

  • Page 5: Set Packaged Boiler Or Block Assembly In Place

    Correct shipping rails. all conditions and repeat step b. If unsealed 2. Remove boiler from skid. Cables are already areas still exist, contact your Weil-McLain attached to block assembly. See Lifting Weight distributor or sales office before continuing Chart.

  • Page 6: Assemble Block

    All manuals and user guides at all-guides.com Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Assemble Block Sections are top heavy. Unbolted sections may Do not pre-cut rope. Gas tight fall if not supported, resulting in severe seal must be maintained to personal injury or death.
  • Page 7 All manuals and user guides at all-guides.com...
  • Page 8 All manuals and user guides at all-guides.com Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Assemble Block Prepare remaining sections: If you would like to pressure-test block 1. Follow “Prepare intermediate section” for assembly now, proceed to page 12.
  • Page 9 All manuals and user guides at all-guides.com...
  • Page 10 All manuals and user guides at all-guides.com Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Assemble Block Prepare flue collector hood c. Apply double-faced tape to flanged surface. d. Apply rope to tape beginning on one side of assembly: open end of hood, leaving 1/4"...
  • Page 11 Correct all conditions and repeat step b. If unsealed areas still exist, contact your Weil-McLain distributor or sales office before continuing installation. Flanged nut Holddown clip Regular nut...

  • Page 12: Perform Hydrostatic Pressure Test

    All manuals and user guides at all-guides.com...

  • Page 13: Connect Water Boiler Piping

    36 to 50 2-1/2" 2-1/2" water fill Check 51 to 77 3" 3" valve 78 to 142 4" 4" Water Manual meter isolation b. Locate circulator in supply piping. valve Pressure c. For return piping, use full diameter pipe for...
  • Page 14 All manuals and user guides at all-guides.com...

  • Page 15: Connect Steam Boiler Piping

    All manuals and user guides at all-guides.com • Installation • Start-Up • Maintenance • Parts Connect Steam Boiler Piping General steam piping information: Install piping: • Hartford Loop piping arrangement and wet Install piping as shown on page 16 for single return are required for steam boilers.
  • Page 16 All manuals and user guides at all-guides.com...
  • Page 17 All manuals and user guides at all-guides.com...
  • Page 18 All manuals and user guides at all-guides.com...

  • Page 19: Install Jacket

    All manuals and user guides at all-guides.com...

  • Page 20: Install Water Boiler Controls

    All manuals and user guides at all-guides.com...

  • Page 21: Install Steam Boiler Controls

    All manuals and user guides at all-guides.com...
  • Page 22 All manuals and user guides at all-guides.com...

  • Page 23: Connect Breeching And Venting Systems

    All manuals and user guides at all-guides.com...

  • Page 24: Install Burner

    All manuals and user guides at all-guides.com Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Install Burner To install burner: Maintain gas-tight seal between burner mounting flange and plate 1. Unpack burner. to prevent damage to air tube.

  • Page 25: Make Final Adjustments

    All manuals and user guides at all-guides.com • Installation • Start-Up • Maintenance • Parts Make Final Adjustments To fill water boilers: Adjust burner and breeching damper: 1. Close manual air vents and drain cocks. Make final burner adjustments 2. Fill to correct system pressure. Correct pressure using combustion test equipment will vary with each installation.
  • Page 26 All manuals and user guides at all-guides.com Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Make Final Adjustments Skim steam boilers: Determine if water treatment is Clean all newly install steam boilers to remove needed (water boilers only): oil.

  • Page 27: Data And Dimensions

    All manuals and user guides at all-guides.com • Installation • Start-Up • Maintenance • Parts Data and Dimensions Data Dimensions Supply Tappings Return Tappings Quantity Quantity And Size* And Size* Boiler Model Water Steam Water Steam 2 - 4" 2 - 4" 2 - 3"...
  • Page 28 All manuals and user guides at all-guides.com Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Data and Dimensions Minimum for heater removal 3" NPT 3" NPT return return Front Back Water line 4" NPT supply outlets W=Boiler...

  • Page 29: Parts

    All manuals and user guides at all-guides.com • Installation • Start-Up • Maintenance • Parts Parts Part No. 550-141-705...
  • Page 30 All manuals and user guides at all-guides.com Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Parts Figure No. Description W-M Sales Ref. No. Front Section (7813) 11B329 Intermediate Section Regular (7815) 11B330 Intermediate Section Supply - Steam (7814)

  • Page 31: Ratings

    Water ratings are based on a piping and pick-up allowance of 1.15. Steam ratings are based on the following allowances: 378 through 1178 - 1.333; 1278 - 1.321. An additional allowance should be made for gravity hot water systems or for unusual piping and pick-up loads. Consult a Weil-McLain representative.
  • Page 32 All manuals and user guides at all-guides.com Part No. 550-141-705/0600...

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