Instruction/ maintenance manual of the product 78 Weil-McLain
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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 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 ..
• 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.
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.
• 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.
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.
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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.
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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.
• 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.
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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.
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• 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).
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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 .
• 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.
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.
• 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 .
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=Boil.
• 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.
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 .
• 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.
Part No. 550-141-705/0600 32.
An important point after buying a device Weil-McLain 78 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Weil-McLain 78 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Weil-McLain 78 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Weil-McLain 78 you will learn all the available features of the product, as well as information on its operation. The information that you get Weil-McLain 78 will certainly help you make a decision on the purchase.
If you already are a holder of Weil-McLain 78, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Weil-McLain 78.
However, one of the most important roles played by the user manual is to help in solving problems with Weil-McLain 78. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Weil-McLain 78 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
