AM Series Boiler & Water Heater User Manual
CHAPTER 7: INSTALLATION
– NATURAL GAS
OMM-0100_E
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GF-146
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11/15/2019
Technical Support
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(800) 526-0288
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NOTE:
Ensure that the high gas pressure regulator is at least 6 to 10 feet upstream of the appliance.
7.7 Checking and Adjusting the Unit Inlet Gas Supply Pressure
DO NOT adjust or attempt to measure gas valve outlet pressure. The gas valve is factory-set for
the correct outlet pressure. This setting is suitable for natural gas and propane, requiring no field
adjustment. Attempting to alter or measure the gas valve outlet pressure could result in damage
to the valve, causing excessive levels of carbon monoxide.
The gas piping must be sized for the proper flow and length of pipe, to avoid excessive pressure
drop. Both the gas meter and the gas regulator must be properly sized for the total gas load. If
you experience a pressure drop greater than 1” W.C., the meter, regulator, or gas line is
undersized or in need of servicing.
Refer to Section 8.6 and check the gas supply pressure.
7.8 High Altitude Operation
Calibration at high altitudes follows the normal combustion calibration procedure and is subject
to a de-rating according to C302.7. See aerco.com for further information.
For installations at higher altitudes in the United States, follow local codes or, in the absence of
local codes, follow ANSI Z223.1/NFPA No. 54, The National Fuel Gas Code, and check and
adjust the CO
2
level following Section 8.7.
7.9 Conversion from Natural gas to Propane Gas
The gas conversion must be performed on each burner present inside the unit.
The gas conversion shall be performed by a qualified service agency in accordance with these
instructions and all applicable codes and requirements of the authority having jurisdiction. The
information in these instructions must be followed to minimize the risk of danger. The qualified
service agency is responsible for the proper conversion of the appliance. The installation is not
proper and complete until the operation of the converted appliance is checked as specified in
these instructions.
Conversion shall be carried out in accordance with the requirements of the provincial authorities
having jurisdiction and in accordance with the requirements of the CAN-B149.1 and CAN1-
B149.2 installation code.
7.9.1 Gas Conversion Kit
The conversion kit (supplied with the unit) is composed of the following parts, which are
necessary for the gas change:
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A label stating the new gas rating and settings.
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Instructions for the change.
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An orifice for each burner present in the unit.
