Nozzle Check pump pressure with pump Nozzle overfiring due to high Reduce pump pressure according
gauge. pump pressure. to installer/serviceman labels
starting on page 30.
Heat Check heat exchanger surfaces Heat exchanger fouled. Clean heat exchanger.
Exchanger for soot or scale fouling.
Baffles Check baffles installed. Baffles not installed. Install baffles.
SOURCE PROCEDURE CAUSES REMEDY
TROUBLE: HIGH NET STACK TEMPERATURES
Tankless Analyze capacity vs. usage. Insufficient coil capacity. Install larger coil.
Coil
Operating Check operating control. Setting too low. Set operating control to 180°F.
Control Raise differential set point.
Heat Inspect coils for fouled surfaces Flow restriction. Remove restriction.
Exchanger and/or flow restrictions.
Fouled surfaces on heat exchanger. Clean heat exchanger surfaces.
SOURCE PROCEDURE CAUSES REMEDY
TROUBLE: INSUFFICIENT DOMESTIC HOT WATER
SERVICE SET-UP TIPS
COMBUSTION EFFICIENCY = CO
2
vs. Stack Temp.
When using the rear vent flue box with integral draft regulator, combustion testing can be taken through the fire port above
the burner. Insert your probe approximately 1/2" to 1" or through a 1/4" hole in the top of the flue box. Locate hole in front
right fire tube (see illustration on page 4). Stack temperature can be taken through a drilled hole in the flue box. To minimize
air dilution, hold draft regulator in a closed position. (See page 4)
BURNER AIR refer to page 5 concerning air for combustion, ventilation, and placement of the boiler in a utility room or
closet. This also addresses special conditions where a boiler is located in an area of operation next to ex haust fans, kitchen
ventilation systems, clothes dryers, etc...(See Section V).
Draft overfire all models 0 to +.10
Draft in stack all models - .02 Min.
CO
2
readings all models 10 - 11.5%
Smoke reading all models 0
- NOTICE -
Above settings are approximate. Final adjustments to be made with proper test equipment. Be sure oil lines are air free
and the use of flare fittings is recommended. See installation/service manual for detailed information.
Alternate Nozzles for AFG
1 .75 - 70°B HAGO
2 .85 - 80°A DELAVAN OR .85 80°B HAGO
3 1.00 - 80°A DELAVAN OR 1.00-80°A HAGO
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