Maintenance
5-4
750-204
Profire D/LND
5.5 — Pilot and Ignition Electrode
The ignition transformer requires little attention other than making sure the ignition wire is firmly attached to the
transformer and the electrode.
FIGURE 5-4. Ignition Pilot Electrode Setting
Be sure the wire insulation is in good condition and not grounded. Failure to keep the ignition electrode clean
and properly set can cause faulty operation. The pilot assembly is supported by a socket in the diffuser and gas
inlet tube. No adjustment is required except proper positioning of the electrode wire.
5.6 — Flame Scanner
The scanner must be clean. Even a small amount of contamination will reduce the flame signal. Wipe the scan-
ner lens with a clean soft cloth.
5.7 — Oil Nozzle
Successful burner operation requires use of the proper style nozzle tip and keeping the orifice clean. Standard
nozzle tips furnished on the burners are of a special emulsifying type which delivers a spray of extreme fineness
and at an angle which insures proper mixing with the air stream. Unsatisfactory performance and loss of effi-
ciency can result from the use of non-standard nozzle tips. If the burner flame becomes stringy or lazy, it is pos-
sible that the nozzle spring is not properly in place or the nozzle is clogged. This problem is usually indicated by
an abnormally high reading on the atomizing air pressure gauge on the air-oil tank.
To remove the nozzle:
1. Disconnect the oil and air tubes from the nozzle assembly.
2. Loosen the three 1/4” screws holding the nozzle spider bracket to the support ring.
3. Withdraw the nozzle and bracket assembly.
4. Clean the nozzle tip by unscrewing the tip from the nozzle body. Use care not to distort the tube.
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