Rapid 4044, Инструкция по установке, эксплуатации и обслуживанию

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4000-S
ERIES
I
NSTALLATION
, O
PERATION AND
S
ERVICE
M
ANUAL
116 of 154
20.2 Direct Fired Burner Flame Provin g (Flame
Rod)
The flame rod in the b u rner is constr u cted of a
material that prod u ces a signal w hen heated. This
signal is meas u red as a direct c u rrent micro amp.
The path of the signal is from the flame rod to the
b
u rner. From the b u rner, w hich is mechanically
gro u nded to the u nit casing, the signal contin u es to
the gro u nded side of the flame rectification mod u le in
the flame safeg u ard control. The signal contin u es o u t
of the mod u le to the flame rod w here it completes the
loop. The length the flame rod extends into the
b
u rner is determined by, the ins u lator s u rro u nding
the rod. This ins u lator m u st not be exposed more
than 1/8" into the b u rner and not recessed more than
1/8". At this setting the flame rod w ill be en v eloped by
the pilot or main flame. It w ill be glo w ing bright red
along at least 50% of its length. See Page 115,
Figure 72 .
NOTE: For the flame rod to prod u ce this signal its
position in relation to the gro u nding rod, pilot and
main flame is critical.
The flame rectification mod u le of the flame safeg u ard
control con v erts this signal to a D.C. v oltage. This
v oltage is the v al u e that is u sed to monitor the pilot
and the main flame of the b u rner. For the flame
safeg u ard control to recognize this signal the v al u e of
the v oltage m u st be bet w een 6 to 18 v olts D.C. and it
m u st be steady. This signal is meas u red at the flame
relay, on the rectification mod u le's test jacks; S1
(colored red) and S2 (colored black). Upon recei v ing
the correct signal, the flame relay w ill accept this as
proof that the b u rner is f u nctioning correctly and w ill
proceed w ith its f u nctions.
FIGURE 73: Maxon NPLE Burner