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Page 4 WM 550-141-996/1105
RWB 6104WMNX R1005
Verify that burner specifi cation number (on burner carton) and confi guration agrees with information below.
Table 1. Burner Confi gurations
The table below provides burner specifi cations and starting air settings for NX burners applied to Weil-McLain Model
UO boilers. Follow all instructions in this burner manual, the boiler manual and the fuel pump literature to install, setup
and service the burner.
Boiler
Model
Burner
Spec
Firing
Rate
(GPH)
Air Tube
Combina-
tion
Inser-
tion
Primary
Nozzle
Alternate
Nozzle
Fuel
Pump
Pres-
sure
(psig)
Head/
Air
Adjust-
ment
Plate
Setting
UO-3 CV WL5703
(See Note1)
0.80 NX70LC 1-3/4” 0.65 X 60
o
A
Delavan
0.65 X 70
o
B
Hago
150 1.75
UO-3 CV WL5703 1.00 NX70LC 1-3/4” 0.75 X 60
o
B
Hago
0.75 X 60
o
B
Delavan
175 2.50
UO-4 CV WL5704 1.20 NX90LB 3-1/2” 1.00 X 70
o
B
Hago
1.00 X 70
o
B
Delavan
140 4.00
UO-5 CV WL5705 1.40 NX90LD 3-1/2” 1.10 X 70
o
B
Hago
1.10 X 70
o
B
Delavan
160 1.50
UO-3 DV WL5803
(See Note1)
0.80 NX70LC 1-3/4” 0.65 X 60
o
A
Delavan
0.65 X 70
o
B
Hago
150 1.75
UO-3 DV WL5803 1.00 NX70LC 1-3/4” 0.75 X 60
o
B
Hago
0.75 X 60
o
B
Delavan
175 2.50
UO-4 DV WL5804 1.20 NX90LB 3-1/2” 1.00 X 70
o
B
Hago
1.00 X 70
o
B
Delavan
140 4.00
UO-5 DV WL5805 1.40 NX90LD 3-1/2” 1.10 X 70
o
B
Hago
1.10 X 70
o
B
Delavan
160 1.50
1) Shipped as 1.0 GPH Burner Confi guration. The 0.80 GPH input uses same burner as 1.0 GPH input. Replace
nozzle, adjust pump pressure and Head/Air setting as shown above and install 14”x16” blanket on combustion
chamber fl oor. (See Maintenance Section for Nozzle Replacement details.)
NX Burner Specifi cations for Weil-McLain Ultra Oil Boilers
NOTICE
The remainder of this manual contains Information to be used ONLY by a
qualifi ed Service Technician.
Weil-McLain Burner Specifi cations