Weil-McLain 550-141-850/0599 manual Bottom side of boiler front section, White side propane plate

•Installation • Start-Up • Parts • Maintenance

Figure 5b Checking and replacing gas/air orifice plate. For propane installations, replace silver plate with red/white propane plate.

	DO NOT use electric or	threaded holes could strip out, causing
	pneumatic screwdrivers to	an inadequate seal of the orifice plate.
	remove or tighten the gas/air boss	Failure to properly seal the plate to
	screws. Hand-tighten only, using	the housing could result in a gas leak,
	manual screwdriver. Should the	causing severe personal injury, death
	torque exceed 40 inch-pounds, the	or substantial property damage.
White side (propane plate)
Warning label side (natural gas)
	(Install with this side
toward air inlet hose)

Gas/air manifold

Bottom side of boiler front section

PROP GVX

Propane — red side Natural — plain side

Install plate with red side (propane) or plain side (natural) against the blower housing.

Orifice plate after bending along score mark. This makes the plate identification readable after

installation.85004b

Part number 550-141-850/0699 19