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Part No. 550-141-705
Weil-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 6
4. Perform Hydrostatic Pressure Test....................................... page 12
5. Connect Water Boiler Piping.................................................. page 13
6. Connect Steam Boiler Piping................................................. page 15
7. Install Jacket ............................................................................. page 19
8. Pipe Tankless Heaters ............................................................. page 19
9. Install Water Boiler Controls .................................................. page 20
10. Install Steam Boiler Controls ................................................. page 21
11. Connect Breeching and Venting Systems........................... page 23
12. Install Burner............................................................................. page 24
13. Wiring and Fuel Piping............................................................ page 24
14. Make Final Adjustments.......................................................... page 25
15. Data and Dimensions .............................................................. page 27
16. Parts............................................................................................ page 29
17. Ratings ....................................................................................... page 31
Warranty...................................................................................... Back Cover
2
Hazard Definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of
various risk levels, or to important information concerning the life of the product.
Indicates presence of hazards that will cause severe personal injury, death or substantial
property damage if ignored.
Indicates presence of hazards that can cause severe personal injury, death or substantial
property damage if ignored.
Indicates presence of hazards that will or can cause minor personal injury, death or substantial
property damage if ignored.
Indicates special instructions on installation, operation or maintenance that are important but not
related to personal injury.
When Calling or Writing about the Boiler
Please have model and series from boiler rating label and CP number(s) from boiler jacket or controls.
Read all instructions before
installing. Failure to follow all
instructions in proper order can
cause severe personal injury, death
or substantial property damage.
Do not use petroleum-based
cleaning or sealing components in
boiler system. Severe damage to
system components can result,
causing substantial propety damage.