Heater Start Up Summary
Is incoming gas pressure | No | Adjust | ||
incoming gas | ||||
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| pressure. | ||
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Yes
Adjust pilot flame.
Lock unit into
high fire.
Does high fire produce |
| No | |
at least a 70°F temp |
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rise and produce the |
| Adjust high fire | |
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correct manifold |
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pressure? |
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| Yes |
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Lock unit into low fire.
Does thin flame fill | No | |
| Adjust low | |
entire burner length? |
| fire. |
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Yes
Burner start up
complete.
Setting incoming pressure:
Presure must be measured at first "T" in supply gas line before the first gas valve.
Adjusting the pilot:
The pilot DC signal should be 12 VDC minimum.
Adjusting high fire:
High fire manifold pressure should be 5" maximum for natural gas and 2.5" maximum for propane. High fire should produce at least a 70°F temperature rise. Remove wire #4 from the Maxitrol 14 amplifier (#2 and #4 for Maxitrol 44). This will drive the valve into its full open position. Adjust high fire with the regulator inside the unit. Turn clockwise to increase temperature rise. Ensure that DC flame signal is minimum 12 VDC. Replace the wires on the Maxitrol Amplifier.
Adjusting low fire:
Remove wire #5 from the Maxitrol 14 amplifier (#8 for Maxitrol 44). This will drive the valve into its lowest position.
Adjust the low fire by turning the low fire bypass screw on the side of teh modulating valve for M511 and M611 models. For MR212 valves, the low and high fire are both under the valve cover. Refer to the included Maxitrol literature for more detailed information. Ensure that DC flame signal is minimum 12 VDC and that the enite length of burner is filled with a thin flame.
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