MN99102 042015
– 10 –
Model 99FRD, 102CRD & EZ-66 Oil Burners — Instruction Manual
3. Prepare Burner
(continued)
Inspect the nozzle adapter before replacing the nozzle. If the
threads have been damaged or show score marks, replace
the nozzle line/adapter assembly.
4. Replace the retention ring assembly by slipping one of the riveted arms
through the gap between the electrode tips. Align this arm straight up,
with the ring clamp firmly against the nozzle adapter shoulder (see
Figure 10). Then tighten the clamping screw.
5. Reposition and check the electrode settings. Position the electrodes as
shown in Figure 10. These settings are critical in ensuring a reliable
ignition. Once the electrodes are set, check all clamps to be sure they
are securely tightened.
6. Insert the combustion head/nozzle assembly in the burner.
Check zero position
(99FRD only)
1. See Figures 11, 12 and 13. Loosen the oil line thumb nut and adjusting
slide locking screw. Use a
B\cx
" Allen wrench to rotate the adjusting
screw until the lead edge of the slide aligns to “0” on the scale. The
retention ring should be flush, or nearly flush, with the edge of the
throttling ring.
2. If the retention ring is not close to flush with the throttle ring, make
sure the air tube is completely inserted into the housing collar and the
retention ring clamp is firmly against the nozzle adapter shoulder.
Set initial burner air settings
Combustion head
1. The combustion head adjusting slide controls the spacing between the
retention ring and throttle ring (or air cone), regulating how much air
passes around the retention ring.
2. Loosen the oil line thumb nut and adjusting slide locking screw. Use a
B\cx
" Allen wrench to rotate the adjusting screw until the lead edge of
the slide aligns to the number given in Table 3, page 11. Lock in place
by first tightening the oil line thumbnut, then tightening the locking
screw.
Air shutter
1. The air shutter is fixed for all 99FRD, EZ-66 and 102CRD burners. See
page 7 for the correct air shutter type. (Some 102CRD burners may
be equipped with 3-slot air shutters.)
Air band
1. The air band is marked in percent opening. Loosen the air band locking
screw and move the air band until the pointer lines up with the percent
opening given in Table 3, page 11.
Final adjustments
1. The burner is now adjusted to the approximate air settings for the firing
rate chosen. When you check combustion with instruments during start-
up or servicing, you may have to adjust the head slightly to achieve the
desired efficiency. See “Adjust burner using test instruments,” page 22.
( Note that pressure overfire will reduce air flow, requiring more air
opening.)
Figure 11 Check zero position — 99FRD only
Figure 10 Combustion head/nozzle/electrode settings
Figure 12 Combustion head and air band adjutsments
