3
IDENTIFICATION
FEATURES AND SPECIFICATIONS ........................................... 2
APPROVALS ............................................................................... 3
IDENTIFICATION
Oil and Burner Nameplate Decal ....................................... 3
Oil Burner Specifications .................................................... 4
SAFETY ....................................................................................... 4
INSTALLATION
Required Ability .................................................................. 4
General ............................................................................... 4
Uncrating ............................................................................ 4
Leveling .............................................................................. 4
Location .............................................................................. 4-5
Clearances ......................................................................... 5
Combustion and Ventilation Air .......................................... 5
Chemical Vapor Corrosion ................................................. 5-6
Flue Gas Venting ................................................................ 6
Vent Connector and Draft Regulator .................................. 6
Water Piping ....................................................................... 7
Closed Water System ........................................................ 7
Drain Valve and Access Panels ......................................... 7
Fuel Systems ..................................................................... 7-8
Burner Installation .............................................................. 8-9
Fuel Pump .......................................................................... 9
Wiring Diagrams ................................................................. 10
OPERATION
General ............................................................................... 11
Filling .................................................................................. 11
Start Up .............................................................................. 11
Water Temperature Control ................................................ 11
High Limit Switch E.C.O. .................................................... 11-12
Burner Certificate (Combustion Test) ............................... 12
Self-Cleaning Eliminator .................................................. 12
Draining ............................................................................. 12
MAINTENANCE
General ............................................................................... 12
Relief Valves ...................................................................... 12
Flushing .............................................................................. 13
Sediment Removal ............................................................. 13
Lime Scale Removal .......................................................... 13-14
Circulating Pump ................................................................ 14
Soot Removal ..................................................................... 14
Vent System ....................................................................... 14
INSTALLATION DIAGRAMS ....................................................... 15-19
CHECKLIST AND SERVICE INFORMATION
Electrical Wiring Replacement ........................................... 20
Not Enough or No Hot Water ............................................. 20-21
Burner Starts - Won't Operate ............................................ 21
Water Too Hot .................................................................... 21
Water Heater Makes Sounds ............................................. 21
Water Leakage is Suspected ............................................. 21
Burner Won't Start .............................................................. 21
Burner Starts But Fails To Run ........................................... 21
Normal Start, But Locks Out On Safety ............................. 22
Safety Primary Control ....................................................... 22
COMBUSTION TEST SPECIFICATIONS .................................... 22
TROUBLESHOOTING ................................................................. 23
WARRANTY ................................................................................. 24
TABLE OF CONTENTS
APPROVALS
The burner and controls are listed by Underwriters' Laboratories Inc.
Accordingly, the burner bears one of the UL labels indicating periodic
inspection of the production of this equipment.
All ASME tanks are built to the standards of Section IV of the American
Society of Mechanical Engineers code and are stamped with their symbol.
The National Board of Boiler and Pressure Vessel Inspectors papers are
furnished upon request. The NB number and HLW symbol (to the right)
are on the plate located just below cleanout on tank. (May be viewed by
removing cleanout cover on jacket).
The heater and burner rating plates or labels provide valuable information.
When ordering parts or inquiring about a unit, be sure to include all
information from the plates. See the picture on page 2 for approximate
location of the heater rating plate.
The heater rating plate model number, see fig. 2, includes a series
number which identifies the construction of the heater.
OIL BURNER NAMEPLATE DECAL
The oil burner's nameplate decal (see page 2 for the approximate location
on the burner) contains a burner code 940 or 941 which should exactly match
the model input appearing under the model number of the heater's rating plate.
If these codes do not match, the oil burner may not be the correct model for
the heater model purchased, Contact your A.O. Smith dealer for further
information and replacement, if required.
A TYPICAL OIL BURNER NAMEPLATE DECAL
FIGURE 3
A TYPICAL HEATER RATING PLATE
FIGURE 2
COF 455 940
CO5MOO6721
XXXXXXXXXX
455,000
3.25
XXX.X
XX
XXX
120
10
60
