Thermo Products PGL20-180 Furnace Model, Orifice Size, Manifold Gas Pressure, No. Turns Closed

All installations and services must be performed by qualified service personnel.

Furnace Model	Orifice Size	Manifold Gas Pressure	No. Turns Closed*
** PGL16-160 Nat	#J (.277)	2.4” W.C.	24
PGL16-160 LP	#8(.199)	2.9”	24
PGL20-180Nat	#J(.277)	3.0”	20
PGL20-180 LP	#3(.213)	3.0”	20
AGL16-160LP	#8(.199)	2.9”	24
AGL20-180Nat	#J(.277)	3.0”	20
AGL20-180LP	#3(.213)	3.0”	20

*Air Adjustment screw: Number of turns closed from the fully open position.

**PG-160 or PG-180 Power Gas Conversion Burners- use chart for applicable settings.

4.Attach a manifold pressure gauge (Inches of W.C. scale) to the outlet of the gas valve.

5.Turn on the furnace and adjust the manifold pressure to the setting indicated above for the desired rate and orifice which applies to the unit being tested.

6.Let the furnace run until warm, approximately 10 minutes. Note: If the furnace required cleaning, you may wish to allow any residual dust or soot to burn off before taking measurements.

7.If the draft exceeds the recommended maximum of .1”, a draft regulator should be used to reduce the draft to the recommended parameters of –01 W.C. to –1” W.C.

8.IMPORTANT: An accurate CO2 or O2 combustion analyzer is required when setting combustion. A carbon monoxide detector capable of measuring flue gas down to 50 PPM of CO is also required. After the unit has operated a minimum of 10 minutes and a proper draft is established-between-.01” W.C. and -.1” W.C., perform a combustion test and make final adjustment to the combustion air to achieve the CO2 or O2 as listed below.

NATURAL GAS

	MIN.	MAX.
CO2	7.0%	11.0%
O2	2.0%	8.9%
CO		<50 PPM
	L.P. GAS
	MIN.	MAX. **See
CO2	8.0%	10.4% Note Below
O2	5.5%	8.9% **See Note Below
CO		<50PPM
	DRAFTOVERFIRE
MIN.		.MAX.
-.01		-.1

**Note!! Under absolutely no circumstances should the air adjustment screw (on LP units only) be closed more than the number of turns indicated by the chart on the previous page.

9.Once the CO2 or O2 is adjusted to the above parameters, a Carbon Monoxide test must be done to insure less than 50 PPM in the flue gas.

Any sign of soot or carboning during combustion indicates that there is insufficient primary air and the air shutter should be opened more until this condition is corrected. If soot or carboning of the burner is suspected, a smoke sample should be taken after the burner operates a minimum of 10 minutes. This would typically only occur in the LP units. Opening the air adjustment screw should reduce the carboning from the combustion process.

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