Weil-McLain UO-3 CV Instruction Manual Download Page 1

Oil Fired Water Boiler

Beckett Model 

NX

 Burners

Potential for Fire, Smoke and Asphyxiation Hazards

To the Homeowner or Equipment Owner:

Please read and carefully follow all instructions provided 
in this manual regarding your responsibilities in caring for 
your heating equipment.
Contact a professional, quali

fi

 ed service agency for 

installation, start-up or service work.
Save this manual for future reference.

Incorrect installation, adjustment, or misuse of this burner could result in death, severe personal 

injury, or substantial property damage. 

To the Professional, Quali

fi

 ed Installer or Service 

Agency:

Please read and carefully follow all instructions provided 
in this manual before installing, starting, or servicing this 
burner or heating system.
The Installation must be made in accordance with all 
state and local codes having jurisdiction.

WARNING

Weil-McLain Part No. 550-141-996/510

Instruction Manual

Summary of Contents for UO-3 CV

Page 1: ...or service work Save this manual for future reference Incorrect installation adjustment or misuse of this burner could result in death severe personal injury or substantial property damage To the Pro...

Page 2: ...2...

Page 3: ...especially during the summer in order to prevent condensation of moisture on the inside surface of the tank y y y y y Remainder of manual to be used ONLY BY QUALIFIED SERVICE TECHNICIANS Weil McLain B...

Page 4: ...t the air inlet openings to the burner or the combustion air ventilation openings in the room y y y y y Please read and understand the manual supplied with this equipment This equipment must be instal...

Page 5: ...3 See Note 2 1 00 NX70LC 1 3 4 0 75 X 60 B Hago 0 75 X 60 B Delavan 175 2 50 UO 4 DV WL6504 See Note 2 1 20 NX90LB 3 1 2 0 85 X 60 W Delavan 0 85 X 60 W Hago 190 4 00 UO 5 DV WL6505 See Note 2 1 40 NX...

Page 6: ...NX90LB 0 40 1 35 6 Slot NX50LC NX70LC NX90LC 1 10 1 75 9 Slot NX50LD NX70LD NX90LD 1 10 1 75 6 Slot NX50LF NX70LF NX90LF Inspect Prepare Installation Site Clearances to Burner and Appliance Provide s...

Page 7: ...ded that an approved insulated stainless steel liner be installed 3 4 5 6 7 For those installations not requiring a chimney such as through the wall vented appliances follow the instructions given by...

Page 8: ...truction sheet supplied with the adapter This kit allows combustion air to be Figure 3 Pressure Switch Installation piped directly to the burner The NX outside air adapter kit may also be used for chi...

Page 9: ...e the bypass plug is NOT installed in the fuel unit Manual bleeding of the fuel unit is required on initial start up If connecting a two pipe fuel supply install the fuel unit bypass plug Oil Leak and...

Page 10: ...rer s wiring diagram prior to connecting the burner wiring All wiring must be in accordance with the latest revision of national Electric Code NFPA 70 and all local codes and regulations In Canada all...

Page 11: ...inals as shown in Figures 7a and 7b Refer to the label on the underside of the control for wiring details Motor off delay on a 7505P will be disabled if the safety and operating limits as shown in Fig...

Page 12: ...on sequence The control will continue to Recycle each time the flame is lost until it reaches a pre set time allotment The control will then go into Hard Lockout instead of recycle This feature preven...

Page 13: ...as the button is held Enables Pump Priming After the reset button has been held for 15 seconds the button can then be clicked during the next ignition sequence to enter Pump Prime mode Run igniter is...

Page 14: ...The fuel valve is opened A flame should be established within the 15 second lockout time LOCKOUT If flame is not sensed by the end of the TFI the control shuts down on safety lockout and must be manu...

Page 15: ...until the retention head engages the fixed stops in the retention ring at the end of the air tube Refer to Figure 10 Tighten the zero setting locking nut The rear door must be closed The adjustment sc...

Page 16: ...Head Retention Head Head Support Legs Head Support Legs Electrode Tips Electrode Tips Electrode Clamp Electrode Clamp Electrode Bracket Electrode Bracket Electrode Insulator Electrode Insulator Elect...

Page 17: ...lint or foreign material Use a clean soft cloth with a degreaser to clean any accumulated soot or oil stains from the throttle cup sight windows Check motor current The amp draw should not exceed the...

Page 18: ...utilizes pressures higher than 100 psig so the actual nozzle flow rate will be greater than the gph stamped on the nozzle body Example A 1 00 gph nozzle 140 psig 1 18 gph For typical nozzle flow rates...

Page 19: ...92 0 99 1 06 0 85 0 95 1 01 1 04 1 13 1 20 0 90 1 01 1 07 1 10 1 19 1 27 1 00 1 12 1 18 1 23 1 32 1 41 1 10 1 23 1 30 1 35 1 46 1 56 1 20 1 34 1 42 1 47 1 59 1 70 1 25 1 39 1 48 1 53 1 65 1 77 1 35 1...

Page 20: ...he splined nut and the lower acorn nut 1 2 3 Turn the air adjustment screw clockwise to adjust the plate with the pointer to the zero position Referring to Figure 10 slide the nozzle line assembly for...

Page 21: ...21 Weil McLain Ultra Oil NX Burner Manual Figure 13 Retention Head Throttle Cup Alignment Figure 14 Blower wheel assembly SK9670 Section Trained Service Technician s Regular Maintenance...

Page 22: ...22 4 22 19 9 17 16 23 10 1 24 6 7 2 15 11a 11c 11b 25 21 26 20 11d 8 5 Section Replacement Parts For best performance specify genuine Beckett replacement parts Replacement Parts...

Page 23: ...et air louvers 1013U 19 Nozzle Line Electrode and Head Assembly Specify 20 PSC Motor Requires Mounting screws 20 x 7 8 21805U 4189 21 Primary control 7505P 22 Retention head assembly 6 slot 51785U 23...

Page 24: ...e choose one of the following options Visit our website at www beckettcorp com warranty Email your request to rwb customer service beckettcorp com Write to R W Beckett Corporation P O Box 1289 Elyria...

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