Weil-McLain 78 - Manual

• Installation • Start-Up • Maintenance • Parts 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 a...

Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Assemble Block 3a Sections are top heavy. Unbolted sections mayfall if not supported, resulting in severepersonal injury or death. Install back refractory blanket: 1. Lay back section on floor with ports face up.2 Apply water glas...

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 sealingcompounds in boiler system. Severe damage tosystem components can resul...

• Installation • Start-Up • Maintenance • Parts 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 sureflue collar gasket is in place, not broken, bentor folded. 2. Install 5/16" x 2" carriage bolts...

General water piping information: • System water supply and return piping should be installed and piping connections attached toboiler before erecting jacket or installingcontrols. • Do not pipe in through supply and out through return. This creates reverse water flow throughboiler that must not be ...

• Installation • Start-Up • Maintenance • Parts Connect Steam Boiler Piping 6a General steam piping information: • Hartford Loop piping arrangement and wetreturn are required for steam boilers. • Maintain 24-inch minimum from waterline to bottom of header (56-1/4" from bottom ofsection). • When ...

Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners Install Burner 12a Wiring and Fuel Piping 13a To install burner: 1. Unpack burner.2. Place gasket around air tube and against burner mounting flange. If sealing rope isused, apply 1/8" continuous bead of ropeadhesive around bu...

• Installation • Start-Up • Maintenance • Parts Make Final Adjustments 14a To 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 squ...

• Installation • Start-Up • Maintenance • Parts Data and Dimensions 15a Data Dimensions Supply Tappings Return Tappings Quantity Quantity And Size* And Size* BoilerModel Water Steam Water 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 ...

• Installation • Start-Up • Maintenance • Parts 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

Weil-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) 11B329 B Intermediate Section Regular (7815) 11B330 Intermediate Section Supply - Steam (7814) 11B331 C Intermediate Section Tankless (7816) 11B332 D Back ...

• Installation • Start-Up • Maintenance • Parts 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 Vent Steam Less Oil Gas Output S...