2. Weil-McLain
  3. WGO Series 4 Oil-Fired Water Boiler

Weil-McLain WGO Series 4 Oil-Fired Water Boiler User manual

  • Hello! I've carefully reviewed this user manual for the Series 4 WGO oil-fired water boilers. This document provides important details about boiler installation, operation, maintenance, and component replacement. I am here to help answer your questions about the features of this boiler which include different assembly options, and detailed instructions for servicing and troubleshooting your boiler. Please feel free to ask me anything!
  • Who should use this manual?
    What type of antifreeze should be used in the boiler system?
    What are the recommended initial steps to ensure the boiler's optimal performance?
• Installation
• Startup
• Maintenance
• Parts
Boiler Manual
Series 4
Oil-Fired Water Boilers



Part number 550-142-331/0124
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
When calling or writing about the boiler



Homeowner —
Read and follow all information on pages 1 through 7 ONLY.
Service technician —
Read and follow ALL information in the entire manual.
Failure to follow all instructions in proper order can cause severe personal injury,
death or substantial property damage.
Using this manual


 

 

 

 


Hazard denitions
Packaged, Semi-packaged, and knocked-down boilers
Packaged boilers:  

Semi-packaged boilers 
           

Knocked-down boilers  

Part number 550-142-331/0124
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Using this manual . . . . . . . . . . . . . . . . . . . . .2
Homeowner. . . . . . . . . . . . . . . . . . . . . . .2
                    
         

Hazard denitions . . . . . . . . . . . . . . . . . . . . .2
Contents . . . . . . . . . . . . . . . . . . . . . . . . . .3
Please read before proceeding . . . . . . . . . . . . . .4
Homeowner. . . . . . . . . . . . . . . . . . . . . . .4
                    4
               4
                   4
                    4
             5
Routine maintenance schedule. . . . . . . . . . . . . .5
             5
              5
5
                 5
                    5
Operation. . . . . . . . . . . . . . . . . . . . . . . . . .6
                   
Troubleshooting . . . . . . . . . . . . . . . . . . . . . .7
Before installing boiler . . . . . . . . . . . . . . . . . .8
             
             

(see                       


Install boiler — Packaged boilers only. . . . . . . . . 10
                      
           
Install boiler -   12
                      
           

              
                 
Install burner — all boilers . . . . . . . . . . . . . . . 15

    
Connect breeching . . . . . . . . . . . . . . . . . . . 16
             
Connect water piping . . . . . . . . . . . . . . . . . .18
              
                      
       
         

                     
              

              
            
Connect wiring. . . . . . . . . . . . . . . . . . . . . . 22
             
                   
            
                     
                     
                 
Connect wiring — blocked vent
shuto switch option . . . . . . . . . . . . . . . . . .25
              
Connect wiring - vent damper . . . . . . . . . . . . . 26
Connect oil piping . . . . . . . . . . . . . . . . . . . . 26
            
            
Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . 27
                     
                
                 
Check-out procedure . . . . . . . . . . . . . . . . . .28
             
           
Annual service check list . . . . . . . . . . . . . . . .29
           
Detailed service procedures . . . . . . . . . . . . . . 30
                
       
Close clearance installation . . . . . . . . . . . . . . 31
              
                 
Replacement parts . . . . . . . . . . . . . . . . . . . 33
Dimensions . . . . . . . . . . . . . . . . . . . . . . . 38
Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Handling ceramic ber and berglass materials . . . 40
Contents
Part number 550-142-331/0124 3
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
 

• 

• 
• 
• 

• 
   

     

• 
• 
• 
• 
Tips for water systems —
•      


 




• 


• 
       

        


 
 



 

 
          

Saltwater Damage —      








Electrical Damage — electrical componentwiring



Homeowner —
•      

the system
•  must
      



•       

• 

•     
   

•     

Service technician —
•       



•        
      

• 
      

•      

 
    

•        


• 
     
       

•       
      

• 
    

• DO NOT TAMPER WITH UNIT OR CON-
TROLS.   


Please read before proceeding
Part number 550-142-331/0124
4
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Routine maintenance schedule
Beginning
each heating season
 

Daily
during heating season
 

Weekly
during heating season
 

 


 


 


End
of heating season
 

• 

• 


Boiler
shutdown
 

 

• 
• 
• 
• 
Frozen Water Damage Hazard





Part number 550-142-331/0124 5
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Figure 1 
1 
2 
3 

4 
5 

6 

7 l
Operation
WGO (see Figure 1)
 
•       

• 
• 
• 
• 
 



 
    

 

Part number 550-142-331/0124
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Troubleshooting
   


Common
Problems Common Causes Possible Corrections


  






 



 



   





    





   
















 
 

 







  


  

    

 




 





Part number 550-142-331/0124
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.

Walls


Wall

A 

B 



A
A
A

Installations must comply with

• 
• 
• 

• 


• 

• 
• 
Before selecting boiler location

• 
• 
• 
•  
• 
• 

Provide clearances around
boiler
(see Figure 2)
 





•  
•  
     


• 
•  
• 

•      
      

Figure 2 
 

Before installing boiler
Homeowner — STOP! 



Part number 550-142-331/0124
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4— Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Before installing boiler 

    
  
Boiler
Size
Length
inches
Width
inches
Minimum
height
inches
WGO-2  
WGO-3  
WGO-4  
WGO-5  
WGO-6  
WGO-7  
WGO-8  
WGO-9  
Table 1 
Provide air for combustion and
ventilation
 

• 
• 

      
        






   





Permanent Openings



Inside air




 

Outside air



• 



• 

  

       
       




• 
•  



Foundation



 
         



• 
• 
Part number 550-142-331/0124
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — Packaged boilers only
Place boiler
 
      

 
 

 


 

 


         
       

      
 
 
        


         

 
 



 
 

 
 
 
 

       

Perform hydrostatic pressure test
 
 
 
 
 

 



      


 
     
      
    

 
 
Part number 550-142-331/0124

WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4— Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — Packaged boilers only 
Figure 3 

Part number 550-142-331/0124 
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler – Semi-packaged and Knocked-down boilers only
    


Place boiler
Semi-packaged WGO-2 through 6 — position on
site
 



outlet (see 
 


 
   

 
  
          


 

 
 



Knocked-down WGO-7, 8 & 9 — split the
assembled block for easier handling (see
Figure 4, page 13)
 

 


 
 
     
  

 


 


 

 


 


      



        



Part number 550-142-331/0124

WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4— Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Figure 4 










hood















Install boiler – Semi-packaged and Knocked-down boilers only (
Knocked-down WGO-2 through 9 — install ue
collector hood (see Figure 4 )
 


 

 



 

  

 
• 

      

• 
  

       

 
Part number 550-142-331/0124 
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Front section
WGO-2


 

Back section
Perform hydrostatic pressure test
 See 
 
 

 
 
 


 



 


 
 


 
Figure 5 
Location Size Function
  
  

  
  

  
 
 

  
Table 2 
 

 
 
 
 
 
 

 

Install jacket
(knocked-down boilers only sizes 7 through 9 only)


Install boiler controls
     and   and 

 

       

Install boiler – Semi-packaged and Knocked-down boilers only
Part number 550-142-331/0124

WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4— Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.








Figure 6 
Install burner
(also refer to instructions packed with burner)
    


For burners with OEM welded anges:
 

 

 
For burners without OEM welded anges:
 

 
 
        

        


 
Install burner — all boilers
Part number 550-142-331/0124 
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Boiler
Size
Minimum
breeching
diameter

Minimum
AHRI
chimney size Minimum
chimney
height
Rect. Round
WGO-2
 
  WGO-3
WGO-4 
WGO-5 

  
WGO-6

WGO-7
WGO-8
 
  
WGO-9

 
 
 
Connect breeching
General chimney requirements
• 

•   
       

• 

•        

•        

• 

• 

• 


• 
• 
• 
• 




• 
•  
•  
• 
 


Connect breeching:
    


      
      

 
 
Table 3
•  and
•  and 
 



Table 3 
 


    



         

•      

•      

• 
 

  


 and
Part number 550-142-331/0124

WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4— Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.

















0251-056_OVD

















0250-056_OVD


















Connect breeching 
Figure 7 

Figure 8 

Figure 9 

Figure 10 

Part number 550-142-331/0124 
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect water piping
General piping information
• 

•        
        






•          

Install piping
• See Table 4



• 

• 







DIAPHRAGM expansion tank
(Figure 11, page 19)
• 



• 


•          

CLOSED expansion tank
(Figure 12, page 19)
• 

    



•        



To connect WGO boilers to indirect-
red water heaters
        

Table 4 
Boiler
Size To system From
system
  
  
  
  
  
  
  
  


Part number 550-142-331/0124

WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4— Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect water piping 
Figure 11
Figure 12 
Isolation


system


To system



 




Isolation










system
To system


Isolation






Part number 550-142-331/0124 
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.


55
3
Piping MULTIPLE ZONES


See        

Zoning with circulators:
       

 

 
Zoning with zone valves:
 

      
     
      

 

      



4
5
5
Figure 13
Legend
1 
2 
3 
4 
5 
Connect water piping 
Figure 14
Part number 550-142-331/0124

WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4— Boiler Manual
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
/