PVI Industries SU-3 manual Burner motor runs and, Burner locks out, The CO content is too high

12. TROUBLESHOOTING

Condition	Solutions
1. Burner motor runs and:
	Check 24V feed to airflow switch & after airflow switch to control. Fix or
No flame after pre-purge	replace the airflow switch. If there is no secondary power, then replace
	the 24V transformer.
No flame, faulty ignition transformer or spark	Check ignition transformer output from Honeywell control and check for
separately	cracked electrode or gap. Fix or replace.
Burner locks out after 4 seconds	First, check ionization electrode, ionization cable (for cracks) and boot.
	Fix as needed.
Polarity reversed	Check power feed for reversed polarity following instructions in the
	Commissioning Checklist, Section 10.1.
Bad earth grounding	Fix the ground wire.
	Check the gas supply regulator and adjust to proper pressure, check that
Gas supply pressure is too low	gas piping is adequately sized following the instructions in Section 6, Gas
	Supply and Piping.

2. Pulsation – * Follow the instructions in Section 10, Burner Setup and Adjustment and using a combustion analyzer, readjust combustion air as required to obtain proper combustion.

Gas pressure is too high.	Use manometer and readjust the inlet pressure. *
Manifold pressure too high	Use manometer and readjust regulator for correct manifold pressure.*
Burner is dirty	Clean burner.
	Adjust barometric damper, clear flue and cap of foreign materials or
Venting is inadequate	correct vent system following the instructions in Section 5, Venting, to
	provide draft within the specified range.
	First correct by steps above, if still pulsating, adjust to a lower head
	position number. Manifold pressure must be readjusted to match that
Misadjusted burner head	shown on the burner information decal and combustion must be
	rechecked following the instructions in Section 10, Burner Setup and
	Adjustment.
3. Burner locks out
Ionization current is too low	Check current. Minimum 0.8 micro amps. Check position of ionization
	electrode and the condition of the cable.
4. The CO content is too high
Excess air is too low or possibly too high	Adjust air shutter.
The gas holes in pressure plate are clogged	Clean them.
The fresh air intakes are too small	Increase the size of combustion air openings to those specified in Section
	4, Combustion and Ventilation Air.
Negative pressure in mechanical room	Remove source of negative pressure and/or increase size of combustion
	air openings.
	Check the gas supply regulator adjust to proper pressure, check that gas
Gas supply is too high or too low	piping is adequately sized following the instructions in Section 10, Burner
	Setup and Adjustment.
Burner settings or adjustment incorrect	Follow the instructions in Section 10, Burner Setup and Adjustment and
	using a combustion analyzer.
5. Condensation in the heat exchanger
	Check burner combustion. If combustion is in range, increase firing rate
	so the gross stack temperature is at least 350oF (177oC) by adjusting to
Firing Rate is too low	a higher head position number. Manifold pressure must be readjusted to
	match that shown on the burner information decal and combustion must
	be rechecked following the instructions in Section 10, Burner Setup and
	Adjustment. If allowed by code and vent manufacturer, insulate the vent.

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PV500-56 06/12