Adjustments
4-10
750-297
Profire E/LNE Series Manual
FIGURE 4-4.
Primary and Secondary Valve Positions
4.10.2 — Gas Meterng Valve Setup
•
Both servos are at the approximate same position at light off and/or low fire.
•
From low to mid fire (approximately 50% rate), use larger changes to the Secondary butterfly position and smaller
changes to the Primary butterfly position.
•
From the mid to high fire, make larger changes to the Primary butterfly position and smaller changes to the Second-
ary butterfly position.
Certain positioning controls require servo-position changes through the entire firing rate. Consequently, nominal
movements of the primary valve through the low-to-mid-fire range and nominal movements of the secondary valve
through the mid-to-high-fire range satisfy these controller requirements only
;
the position changes should have little
effect on the combustion rate.
5.0 Low Fire
5.0 Low Fire
65
5.5
10.0
60
6.0
15.0
6.5
20.0
7.0
25.0
7.5
30.0
8.0
35.0
8.5
40.0
Secondary
9.0
45.0
9.5
50.0
10.0
55.0
10.5 Mid Fire
60.0 Mid Fire
15.0
60.5
20.0
61.0
25.0
61.5
Primary
30.0
62.0
35.0
62.5
40.0
63.0
45.0
63.5
50.0
64.0
55.0
64.5
5
60.0 High Fire
65.0 High Fire
Low Fire
Mid Fire (50%)
High Fire
OP
EN
IN
G -
>
FIRING RATE ->
Primary and Secondary Bu
Ʃ
er
Ň
y Posi
Ɵ
on with respect to Firing Rate
Primary
(larger valve)
Secondary
Manifold Bu
Ʃ
er
Ň
y Valve Opening
NOTE: Values represent Valve Opening in % or
Degrees depending on the Control being used