Section: Nozzle Assembly Maintenance
E. Low Firing Rate Baffle.
The low firing rate baffle (See LFRB in Replacement Parts) reduces the air flow and pressure. The LFRB is sometimes used for firing rates under 1.00 gph as listed in Table 1. Refer to the equipment manufacturer’s instructions. Do not omit the LFRB when specified. Omitting the baffle when specified or installing the baffle when not specified could result in poor burner performance.
2.Place a 3/4”
3.If the nozzle is already installed, remove the nozzle line assembly to verify that the nozzle size and spray pattern are correct for the application (per equipment manufacturer’s information). Verify that the electrode tip settings comply with Figure 2.
Nozzle Assembly
Maintenance
Correct Nozzle and Flow
Rate Required
Use care when removing or installing an oil nozzle
A damaged nozzle could cause impaired combustion, sooting, puffback of hot gases, oil leakage and potential fire or asphyxiation hazards.
Incorrect nozzles and flow rates could result in impaired combustion, under- firing,
Use only nozzles having the brand, flow rate (gph), spray angle and pattern specified by the appliance manufacturer.
Follow the appliance manufacturer’s specifications for the required pump outlet pressure for the nozzle, since this affects the flow rate.
yNozzle manufacturers calibrate nozzle flow rates at 100 psig.
yWhen pump pressures are higher than 100 psig, the actual nozzle flow rate will be greater than the gph stamped on the nozzle body. (Example: A 1.00 gph
yInspect the nozzle adapter to insure that the sealing surface is not grooved or scratched.
yTo insure that the nozzle functions properly, check the orifice and strainer for dirt, scratches or other damage before installation.
yDo NOT attempt to install or remove a nozzle without securing the adapter to prevent seriously damaging the alignment.
yUse care when handling the nozzle line assembly to prevent changing the electrode tip settings or damaging the ceramic electrode insulators.
yEnsure that the electrode settings match the values shown in Figure 2.
Figure 2. Electrode Tip Setting
nozzle at 140 psig = 1.18 gph)
Securely tighten the nozzle (90 torque inch pounds). For typical nozzle flow rates at various pressures refer to Table 3.
A. Replace the Burner Nozzle.
1.If applicable, remove the plastic plug protecting the nozzle adapter threads.
5/32” GAP
1/4” ABOVE
CENTER
1/8”
Figure 5. Nozzle, Line & Electrode Assembly
Electrode gap to be centered with nozzle center.
Contacts to be parallel with | 6 |
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horizontal center line within 2°. | 8 | 1 | 90° | 5 |
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11 |
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10
9
2
7
3
4
4
Item # Description
1Electrode Contact (3” ATC or extension over 3”)
2Nozzle Line
3Spider spacer assembly
4Static Plate
5Electrode clamp
6Electrode clamp retaining screws
Item # Description
7Nozzle line setscrew
8Electrode Insulator
9Nozzle adapter
10Nozzle tip
11Electrode tip
12 Vdc ADC Burner Manual
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