Vanguard Heating VGN30 installation manual Burner does not light, continued from page, Continued

OBSERVED		POSSIBLE
PROBLEM		CAUSE				REMEDY
Burner does not light		2.	Burner orifice diameter			2.	Replace burner orifice
after ODS/pilot is lit			is too small
(continued from page		3.	Inlet gas pressure is too			3.	Contact local natural gas
18)			low				company
Delayed ignition of		1.	Manifold pressure is too			1.	Contact local natural gas
burner			low				company
		2.	Burner	orifice	is	2.	Clean	burner		(see
			clogged				CLEANING			AND
							MAINTENANCE, page
							17) or replace burner ori-
							fice
Burner backfiring		1. Burner		orifice	is	1.	Clean	burner		(see
during combustion			clogged or damaged				CLEANING			AND
							MAINTENANCE, page
							17) or replace burner ori-
							fice
		2.	Burner damaged			2.	Replace burner
		3.	Gas regulator defective			3.	Replace gas regulator
Yellow	flame during	1. Not enough air				1.	Check burner for dirt and
burner combustion							debris. If found,			clean
							burner (see CLEANING
							AND MAINTENANCE,
							page 17)
		2.	Gas regulator defective			2.	Replace gas regulator
Slight smoke or odor		1. Residues from manu-				1.	Problem will stop after a
during	initial opera-		facturing processes				few hours of operation
tion
Heater	produces a	1. Turning control knob to				1.	Turn	control	knob		to
whistling noise when			HIGH	position when			LOW	position	and		let
burner is lit			burner is cold				warm up for a minute
		2.	Air in gas line			2.	Operate burner until air is
							removed from line. Have
							gas line checked by local
							natural gas company
		3.	Air passageways		on	3.	Observe minimum instal-
			heater blocked				lation	clearances		(see
							Figure 2, page 6)
		4.	Dirty	or partially		4.	Clean	burner		(see
			clogged burner orifice				CLEANING			AND
							MAINTENANCE, page

17) or replace burner ori- fice

Continued

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