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

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

  • Hello! I've reviewed the Weil-McLain Series 4 WTGO Boiler Manual. This document covers everything from installation, maintenance, to troubleshooting. It includes instructions for various boiler configurations and important safety guidelines, as well as detailed procedures for connecting water, oil, and electrical components. I am ready to answer your questions about the boiler and its operation.
  • What should a homeowner do before operating the boiler?
    What is the recommended pH range for boiler water?
    What type of antifreeze is recommended for hydronic systems?
Part number 550-142-332/0124
• Installation
• Startup
• Maintenance
• Parts
Boiler Manual
Series 4
Oil-Fired Water Boilers



Part number 550-142-332/0124
2
WTGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.


 

 

 

 


Hazard denitions
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
When calling or writing about the boiler
              

Packaged boilers: 


Semi-packaged boilers: 


Knocked-down boilers: 

Part number 550-142-332/0124
WTGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Contents
Using this manual . . . . . . . . . . . . . . . 2
Homeowner . . . . . . . . . . . . . . . . . 2
                   2
         2
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
             8
             8
    8

              
Install boiler — Packaged boilers only. . . . . 10
                      
           
Install boiler -  12
                      
                
           
      
                 
Install burner — all boilers . . . . . . . . . . 15

                  
Connect breeching . . . . . . . . . . . . . . .16
             
                  
Connect water piping . . . . . . . . . . . . . 18
              
                     
       
         

              
              

              
            22
Connect tankless heater piping . . . . . . . .23
Connect wiring . . . . . . . . . . . . . . . . .24
             24
                   24
                    24
                     24
                     24
                 24
            24
              27
Connect wiring - vent damper . . . . . . . . . .28
Connect oil piping . . . . . . . . . . . . . . . 28
            28
Start-up . . . . . . . . . . . . . . . . . . . . . 29
                     
                
                 
                   
Check-out procedure . . . . . . . . . . . . . . 30
            
           
Annual service check list . . . . . . . . . . . 31
           
Detailed service procedures . . . . . . . . . . 32
                
       
Handling ceramic ber and berglass materials 33
Close clearance installation . . . . . . . . . .34
              
Replacement parts . . . . . . . . . . . . . . . 36
Dimensions . . . . . . . . . . . . . . . . . . .41
Ratings . . . . . . . . . . . . . . . . . . . . .42
Part number 550-142-332/0124
4
WTGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Please read before proceeding
 

• 

• 
• 
• 

• 
     

      

• 
• 
• 
• 
Tips for water systems —
•      


 




• 


• 
       

        


 
 



 

 
          

Saltwater Damage — 




       



Electrical Damage —electrical componentwiring


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Homeowner —
•      

the system
•  must
      



•       

• 

•     
   

•     

Service technician —
•       



•        
      

• 
      

•      

 
    

•        


• 
     
       

•       
      

• 
    

• DO NOT TAMPER WITH UNIT OR CON-
TROLS.   


Part number 550-142-332/0124 5
WTGO 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 550-142-332/0124
WTGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Operation
WTGO (see Figure 1).
 
•       

• 
• 
• 
• 
Figure 1 
 



 
    

 

1 
2 
3 

4 
5 




6 

7 l
Part number 550-142-332/0124 7
WTGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
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Common Problems Common Causes Possible Corrections
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 




 





Part number 550-142-332/0124
8
WTGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Before installing boiler

Walls
24"
A
A
A
Wall


Wall
24"

Installations must comply with

• 
• 
•       
      

• 


• 

• 
• 
Before selecting boiler location
• 
• 
• 
• 
•  
• 
•        

Provide clearances around boiler
(see Figure 2)
 
     


•       

•  
•  
 

• 
•   
•   
•       
  
• 


Homeowner — STOP! The procedures and information on this and following pages are intended only for a
qualied service technician who has the necessary equipment to inspect and adjust boiler and burner. A homeowner
should never attempt these procedures. The service technician must also read pages 1 through 7 before proceeding.
 

Figure 2 
A 

B 


Part number 550-142-332/0124
WTGO 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
WTGO-3L 17 22 2
WTGO-3 17 22 2
WTGO-4 20 22 2
WTGO-5 20 22 2
WTGO-6 23 22 2
WTGO-7 26 22 2
WTGO-8 29 22 2
WTGO-9 32 22 2
Table 1 
Provide air for combustion and ventilation
 

• 
• 













•          

         

• 





• 


• 



• 



• 

       


• 
• 


Lay a foundation, if needed







• 
• 


    
  
Part number 550-142-332/0124

WTGO 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 550-142-332/0124 
WTGO 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 550-142-332/0124

WTGO 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
 



 

• 


• 


• 
 
• 

        

• 

• Sn
 
    


 

 

 


 
 
     
     

          


        


         

 


 


 


 




 

 


         


        

        


 
        

 

 





 



Tankless heater, if used
 
        


Part number 550-142-332/0124 
WTGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.










hood















Install boiler – Semi-packaged and Knocked-down boilers only 
Figure 4 
Part number 550-142-332/0124

WTGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Location Size Function
  
  

 
 ¼"

¾" 
L ¾" 


 

 ¾"  Front section


L


Back section
Install boiler – Semi-packaged and Knocked-down boilers only 
Perform hydrostatic pressure test
 Table 2 and 
 
 

 
 
 


 



 


 
 


 
 

 
 
 
 
 
 



Install jacket
(required on sizes 7 through 9 only)


Install boiler controls
Table 2 and  to

 


 

       

Table 2  Figure 5 
Part number 550-142-332/0124 
WTGO 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 550-142-332/0124

WTGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect breeching
Table 3 
Boiler
Size
Minimum
breeching
diameter

Minimum AHRI
chimney size Minimum
chimney
height
Rect. Round
WTGO-3 5" 
  
WTGO-4 
WTGO-5 

 7" 
WTGO-6
7"
WTGO-7
WTGO-8
7" 
 7" 
WTGO-9

 
 
 
General chimney requirements
• 


      

• 

•    

•        

• 

• 

     


• 
• 
• 



         

• 
 
  
• 
    


Connect breeching
 
   




 
 

• 
• 

        
     

 


    



         

•      

• 

• 
 

 


 and 8
Part number 550-142-332/0124 
WTGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect breeching 
Figure 7 

Figure 8 

Figure 9 

Figure 10 


















0251-056_OVD

















0250-056_OVD


















Part number 550-142-332/0124

WTGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect water piping
Table 4 
General piping information
• 

• 






• 

Install piping:
See Table 4



• 

• 


 



DIAPHRAGM expansion tank
(Figure 11, page 19)
• 



 


•           

CLOSED expansion tank
(Figure 12, page 19)
• 

• 


• 
    
       

To connect WTGO boilers to
indirect-red water heaters
• 

• 
•      


• 


Boiler
Size To system From
system
  
  
  
  
  
 2" 2"
 2" 2"


Part number 550-142-332/0124 
WTGO 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


















system
To system


Isolation






Part number 550-142-332/0124

WTGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.


5
2
Connect water piping 


4
5
Piping MULTIPLE ZONES
   

See        

Zoning with circulators:
       

 

 
Zoning with zone valves:
 

      
     
      

 

      

Legend
1 
2 
3 
4 
5 
Figure 13
Figure 14
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