MagnaTherm Boilers and Water Heaters
Page 79
Model
Gas Type
High Fire CO
2
Low Fire CO
2
Pressure Differential
1,600
Natural
9.0% ± 0.2
.25 lower than high fire CO
2
0.5” to 1.2” wc*
Propane
10.0% ± 0.2
.25 lower than high fire CO
2
0.5” to 1.2” wc*
2,000
Natural
9.0% ± 0.2
.25 lower than high fire CO
2
0.5” to 1.2” wc*
Propane
10.0% ± 0.2
.25 lower than high fire CO
2
0.5” to 1.2” wc*
2,500
Natural
9.0% ± 0.2
.25 lower than high fire CO
2
0.9” to .09” wc
Propane
10.0% ± 0.2
.25 lower than high fire CO
2
0.9” to .09” wc
3,000
Natural
9.0% ± 0.2
.25 lower than high fire CO
2
0.5” to 1.2” wc
Propane
10.0% ± 0.2
.25 lower than high fire CO
2
0.5” to 1.2” wc
3,500
Natural
9.0% ± 0.2
.25 lower than high fire CO
2
0.5” to 1.2” wc*
Propane
10.0% ± 0.2
.25 lower than high fire CO
2
0.5” to 1.2” wc*
4,000
Natural
9.0% ± 0.2
.25 lower than high fire CO
2
0.5” to 1.2” wc*
Propane
10.0% ± 0.2
.25 lower than high fire CO
2
0.5” to 1.2” wc*
* - Only check the pressures if there are problems getting the CO
2
and CO values in range.
High fire adjustment
Gas Valve
Shown is a model 3000.
All units have a similar
design with the gas valve
similarly located.
Low fire adjustment
Figure 46. High and Low Fire Adjustments on the Gas Valve
Table 24. CO
2
RangeandPressureDifferential
