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AM Series Boilers and Water Heaters User Manual
CHAPTER 10 – MAINTENANCE
10.8 Flame Signal Inspection
• Start the unit and perform the combustion calibration procedure per section 8.7.
• At high fire and low fire the flame signal (parameter 1008) should be within values given in
Appendix A, under header "ionization current". A lower flame signal may indicate a fouled
or damaged flame sense electrode. If cleaning the flame sense electrode does not improve the
problem, ground wiring is in good condition, and ground continuity is satisfactory, replace the
flame sensor electrode.
10.9 Relief Valve Inspection
• Inspect the relief valve and lift the lever to verify flow.
• Before operating any relief valve, ensure that it is piped with its discharge in a safe area to
avoid severe scald potential.
• Relief valve should be re-inspected at least once every three years, by a licensed plumbing
contractor or authorized inspection agency, to ensure that the product has not been affected
by corrosive water conditions. Certain naturally occurring conditions may corrode the valve
or its components over time, rendering the valve inoperative. Such conditions are not
detectable unless the valve and its components are physically removed and inspected. This
inspection must only be conducted by a plumbing contractor or authorized inspection agency
– not by the user.
WARNING!
Failure to re-inspect the relief valve as directed could result in unsafe pressure buildup, and a
dangerous condition.
10.10 Unit Vicinity Inspection
The following are NOT allowed to be in the vicinity of the unit or the flue exhaust system:
• Combustible/flammable materials: Do not store combustible materials, gasoline or any other
flammable vapors or liquids near the unit or exhaust system. Remove immediately if found.
• Air contaminants: Products containing chlorine or fluorine, if allowed to contaminate the
heater intake air, will cause acidic condensate in the heater. This will cause significant
damage to the heater if allowed to continue. If any of these products are in the room from
which the heater takes its combustion air, they must be removed immediately or the
heater combustion air (and vent termination) must be relocated to another area.
All materials discussed above should be immediately removed from the heater vicinity and the
vicinity of the heater combustion air inlet.
If these materials have been present for an extended period, call a qualified service technician
to inspect the heater for possible damage from acid corrosion.
If products cannot be removed, immediately call a qualified service technician to re-pipe vent
and air piping and locate vent termination/air intake away from contaminated areas.
10.11 Pressure Gauge Inspection
Make sure the pressure reading on the heater pressure gauge (item "M" in Figures 5-1 or 5-3)
does not exceed the maximum working pressure. Higher pressures may indicate a problem with
the expansion tank.
OMM-0100_E • GF-146 • 11/15/2019
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Page 126 of 170
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