Nordyne SERIES M1B, AND M5S installation instructions Fuel Supply and Piping, Important Notes

FUEL SUPPLY AND PIPING

WARNING:

All piping must conform with local building codes, or in the absence of local codes,with the most recent edition of the National Fuel Gas Code ANSI Z223.1 or (CAN/CGA B149.1 or .2). Failure to follow all safety warnings could result in serious injury, death or property damage.

This furnace may be installed with left or right side gas entry.When connecting the gas supply, provide clearance between the gas supply line and the entry hole in the furnace casing to avoid unwanted noise and/or damage to the furnace. Typical gas service hookup for this furnace is shown in Figure 26. Table 14 (page 37) lists gas fl ow capacities for standard pipe sizes as a function of length in typical applications based on nominal pressure drop in the line.

IMPORTANT NOTES:

•Some local regulations require the installation of a manual main shut-off valve and ground joint union external to the furnace (Figure 36). The shut-off valve should be readily accessible for service and/or emergency use. Consult the local utility or gas supplier for additional requirements regarding placement of the manual main gas shut-off.

•Gas piping must never run in or through air ducts, chimneys, gas vents, or elevator shafts.

•Compounds used on threaded joints of gas piping must be resistant to the actions of -liquefied petroleum gases.

•The main gas valve and main power disconnect to the furnace must be properly labeled by the installer in case emergency shutdown is required.

•Flexible gas connectors are not recom- mended for this furnace but may be used if allowed by local jurisdiction. Only new flexible connectors may be used. DO NOT reuse old flexible gas connectors.

•A drip leg should be installed in the vertical pipe run to the unit (Figure 36).

•All piping shall be black iron pipe, or equivalently sized steel tubing. Internally tinned copper tubing may be used for gas supply systems.

Fuel line installations other than typical installations shown in Figures 26 and 27 (page 17) must comply with the fuel piping provisions stated in the Federal Manufactured Home Standard (H.U.D. TITLE 24, PART 280) and the National Fuel Gas Code (ANSI-Z223.1/ NFPA-54).

•Optional fuel inlet lines are available for all gas furnace models to permit the addition of a 1/2” F.P.T. shut-off valve above the fl oor.

NOTE: Shut-off valve must be designed and listed for use with liquid petroleum (L.P. gas).

The gas supply to your home will either be Natural Gas or L.P. (bottle gas). Your furnace is factory equipped to operate on Natural Gas. If your gas supply is L.P. (bottle gas), you must contact a qualifi ed serviceman or gas supplier to convert the furnace. Instructions for gas conversion are listed on page 18. Factory installed orifi ce sizes are listed in Table 10 (page 31).

For natural gas operation, the furnace is designed for 7” W.C. inlet pressure. Pressure is reduced to 3 1/2” W.C. by the pressure regulator in the gas valve. The maximum inlet pressure for the valve is 13” W.C.

On-Off-Fan
Switch
Control
Panel
Floor
To Gas	Alt. Fuel
	Line Entry
Supply

Figure26. Typical Gas Piping

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