LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 65)

MagnaTherm Boilers and Water Heaters Page 61
Model Gas Type High Fire CO
2
Low Fire CO
2
Pressure Differential
2,000
Natural 9.0% ± 0.2 0.25% lower than high fire CO
2
0.5” to 1.2” wc*
Propane 10.0% ± 0.2 0.25% lower than high fire CO
2
0.5” to 1.2” wc*
2,500
Natural 9.0% ± 0.2 0.25% lower than high fire CO
2
0.9” to .09” wc
Propane 10.0% ± 0.2 0.25% lower than high fire CO
2
0.9” to .09” wc
3,000
Natural 9.0% ± 0.2 0.25% lower than high fire CO
2
0.5” to 1.2” wc
Propane 10.0% ± 0.2 0.25% lower than high fire CO
2
0.5” to 1.2” wc
3,500
Natural 9.0% ± 0.2 0.25% lower than high fire CO
2
0.5” to 1.2” wc*
Propane 10.0% ± 0.2 0.25% lower than high fire CO
2
0.5” to 1.2” wc*
4,000
Natural 9.0% ± 0.2 0.25% lower than high fire CO
2
0.5” to 1.2” wc*
Propane 10.0% ± 0.2 0.25% 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
Low fire adjustment
Figure 31. High and Low Fire Adjustments on the Gas Valve
Table 16. CO
2
Range and Pressure Differential