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Flame Safeguard Control Flame Signal Values
This curve correlates the relative values of O
fuels listed, as well as the percentage of excess air at given
O
and CO
values.
2
2
Example: Following the dotted line on the vertical axis from
4% O
to curve H and the dotted line on the horizontal axis to
2
the left, the % excess air column shows that 4% O
25% excess air.
Following the vertical dotted line axis again from curve H to
fuel A (Natural Gas) and the horizontal axis to the left, the %
CO
column shows that 4% O
2
Table 12
Acceptable Stable Pilot and/or Main Flame Current Readings
Control
R7795A or C
R7795B or D
R479A (D)
R4140M (G,L) or
BC7000
R7800
TFM - 2(3) or MII
UVM - 2(3)(5) or MII
D Series
E110
1. 4-10 Microamps - with microammeter in series with S - 2 wire to flame rod.
Table 13
CO
- O
Ratio Curves for Fuel Oils and Gases
2
2
170
1 7
160
1 6
F
150
1 5
E
140
1 4
D
130
1 3
120
1 2
B
C
110
1 1
A
100
1 0
9 0
9
8 0
8
7 0
7
6 0
6
5 0
5
4 0
4
3 0
3
2 0
2
1 0
1
0
1
2
3
PERCENT OXYGEN (O
CURVE
FUEL
A
Nautral Gas
B
Natural Gas
C
Propane
D
Butane
and CO
for the
2
2
equals
2
and 25% excess air correlate
2
Photocell or Flame Rod
N/A
2 microamps
2 microamps
2-5 microamps
1.25-5.0 DC Volts
14-17 DC Volts
1
N/A
15-25 DC Volts
10 min., 20 or greater normal
G
4
5
6
7
8
)
2
MAXIMUM CO
%
2
11.7
12.1
12.1
14.0
1
to 9
/
% CO
for Natural Gas.
2
2
Again following the 4% O
Oil ) and to the left to the CO
25% excess air correlate to 12
This chart can be used to determine required CO
values (and therefore equivalent BTU input values) for
the secondary fuel when the burner has been properly
adjusted for the primary fuel inputs.
U.V.
1
3
/
microamps
2
N/A
1
1
/
microamps
2
3
1
/
- 7
1
/
microamps
2
2
1.25-5.0 DC Volts
N/A
5-6 DC Volts
15-25 DC Volts
10 min., 20 or greater normal
H
9
10
11
12
13
14
CURVE
E
F
G
H
vertical axis fo fuel line E (#2 Fuel
2
column shows that 4% O
2
1
/
% CO
on #2 Fuel Oil.
2
2
Lead Sulfide
N/A
N/A
N/A
2-5 microamps R7248A Red Amp
3
1
/
microamps R7248B Red Amp
2
N/A
N/A
N/A
15-25 DC Volts
N/A
15
16
17
18
19
FUEL
MAXIMUM CO
#2 Fuel Oil
15.2
#5 Fuel Oil
16.0
#6 Fuel Oil
16.9
Excess Air vs. O
2
C41
Rev.304
and
2
or O
2
2
20 20.93
%
2
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