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MODELS COF-199 THRU 700A
COMMERCIAL OIL FIRED WATER HEATER FOR HOT WATER SUPPLY
• Installation • Service • Maintenance
ASME
CAUTION
TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE
TO YOUR SAFETY. PLEASE READ THOROUGHLY BEFORE USING
APPLIANCE.
A DIVISION OF A.O. SMITH CORPORATION
MCBEE, SC • SEATTLE, WA
STRATFORD, (ONTARIO) CANADA
VELDHOVEN, THE NETHERLANDS
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND
NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
PRINTED IN U.S.A. 0705 P
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FEATURES AND SPECIFICATIONS TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION applications. The principal components of the heater are shown and RELATIVE TO YOUR SAFETY. PLEASE READ THOROUGHLY BEFORE identified here. The identification plate illustrations on page 4 interpret USING APPLIANCE. certain markings into useful information. Use these references to identify the heater and its components This is a typical Duraclad oil-fired heater for commercial water heating FIGURE 1 TABLE 1 NOMINAL M
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TABLE OF CONTENTS Water Temperature Control ................................................ 11 FEATURES AND SPECIFICATIONS ........................................... 2 APPROVALS ............................................................................... 3 High Limit Switch E.C.O. .................................................... 11-12 Burner Certificate (Combustion Test) ............................... 12 IDENTIFICATION Oil and Burner Nameplate Decal ....................................
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If it is necessary to reset the safety control, depress red button one time OIL BURNER SPECIFICATIONS only. If burner does not operate after depressing red button one time, call serviceman. The oil burner nameplate decal includes a series code which identifies the major features of the oil burner. The series number is the last three digits of the burner code number. INSTALLATION Table 3 below describes the oil burner characteristics for each series number. The burners are to be used with fuel oi
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• The discharge opening of the relief valve should always be piped CHEMICAL VAPOR CORROSION to an open drain. • Choose the point of major hot water usage, fuel supply and chimney. Water heater corrosion and component failure can be caused by the • Try to make hot water and oil piping as short as possible. heating and breakdown of air borne chemical vapors. Spray can • Insulate hot and cold water piping where heat loss and propellants, cleaning solvents, refrigerator and air conditioning condensa
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• When communicating with outdoors by means of vertical ducts, TABLE 4 SUGGESTED VENT CONNECTOR SIZES each opening shall have a free area of not less than one square 2 Outlet Diameter inch per 4,000 Btu per hour (551 mm /kW) (35 square inches Model Number Inches (mm) per gallon of oil consumed per hour) of total input rating of COF-199* 6 152.4 all appliances in the enclosure. COF-245 8 203.2 COF-315/315A 8 203.2 • If horizontal ducts are used, each opening shall have a free COF-
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MULTIPLE HEATER FLUES DRAIN VALVE AND ACCESS PANELS When two or more oil-fired water heaters are connected to a single The heaters are equipped with a 3/4" NPT drain valve mounted above chimney or vent there shall be sufficient draft available for safe and to the left of the oil burner, see FEATURES, page 2. combustion and removal of combustion products to the outdoors from An access panel is located above and to the left of the oil burner and each heater. Refer to local codes for connection de
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TABLE 6 Distance Max. Distance Max. Tank Run length Tank Run Length Bottom Ft. (M) Bottom Ft. (M) Below Below Pump 3/8" 1/2" Pump 3/8" 1/2" Plug O.D. O.D. Plug O.D. O.D. Ft. (M) Tubing Tubing Ft. (M) Tubing Tubing 1 (0.3) 66 (20.1) 100 (30.4) 6 (1.8) 36 (10.9) 100 (30.4) 2 (0.6) 55 (16.7) 100 (30.4) 7 (2.1) 31 (9.4) 100 (30.4) 3 (0.9) 50 (15.2) 100 (30.4) 8 (2.4) 26 (7.9) 100 (30.4) 4 (1.2) 45
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BURNER • Bring the factory wiring from the high limit /eco and thermostat into the oil burner junction box. The burner assembly is mounted on the flange of the combustion chamber, fig. 14. • Install field and factory wiring as shown in the wiring diagrams, figs. 15. A schematic diagram is also shown for convenience NOTE: Be certain combustion chamber opening is aligned with opening when servicing. in heater flange, fig. 14, before placing burner into heater . • Ground the heater in accordance
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FIGURE 15 • Repair any water and oil leaks. Tighten electrical and flue OPERATION connections as necessary. 2. Where the water heater or water heating systems includes a GENERAL circulating pump, it may need to be lubricated before operated. The tube of lubricant supplied with the pump includes directions for use. Never operate the heater unless the tank is filled with water and a temperature and pressure relief valve is installed. • Field installed circulating pumps should be all bronze constr
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and may be set for 120° (48.9°C) to 180°F (82.2°C) water 6. To turn the heater off, open the electrical disconnect switch. If the temperature, but 120°F (48.8°C) is the recommended starting point. heater is to remain inoperative for a long period of time, close the It is suggested the dial be placed in the lowest setting which produces shutoff valve on the oil supply line. an acceptable hot water supply. This will always give the most energy efficient operation. The temperature control has a 4°F
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If water does not flow, remove the valve and inspect for obstructions or DRAINING corrosion. Replace with a new valve of the recommended size as necessary. Inspection of the valve should be performed at least every three years. Do not The water heater must be drained if it is to be shut down and exposed to attempt to repair the valve, as this could result in improper operating and a tank freezing temperatures. Maintenance and service procedures may also explosion. In areas with poor water condit
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Lime accumulation not only reduces the life of the equipment but • Remove drain valve from heater and insert a 3/4" x 4" drain nipple. also reduces efficiency of the heater and increases fuel consumption. • Connect the clamp 1" I. D. x 3" hole to Flo-Jug and drain nipple. ® The usage of water softening equipment greatly reduces the 3. Lift the Flo-Jug to the POUR POSITION and permit the UN•LIME to hardness of the water. However, this equipment does not always flow into the heater as rapidly a
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amount of the solution. If the material is vigorously dissolved by the solution, the UN•LIME® can be reused. If not, then UN•LIME® has been weakened and should be replaced. 8. When deliming has been completed, the heater should be flushed for 3 to 5 minutes with fresh water. • Remove the deliming equipment, install the drain valve, open the cold water inlet line and allow water to flow through heater and out the drain valve. Don't forget to plug vent and cap opening in Flo-Jug. 9. When flushin
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INSTALLATION DIAGRAMS ONE TEMPERATURE - ONE HEATER VERTICAL STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION SCALD PREVENTION HOT WATER CAN SCALD IF USED CARELESSLY OR IN UNANTICIPATED MANNER. CAUTION IF BUILDING COLD WATER SUPPLY HAS A BACK FLOW PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE, PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED. NOTE: CONNECT RETURN LINE FROM HOT WATER CIRCULATING LOOP (IF USED) TO COLD WATER INLET L
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SINGLE TEMPERATURE OR BOOSTER DANGER: TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURES AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 11. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE STORAGE WITH OR WITHOUT RECIRCULATION INSET B VACUUM RELIEF VALVE INSTALL PER LOCAL CODES. INSET A INSTALL THERMAL EXPANSION TANK IN COLD WATER SUPPLY LINE
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TWO TEMPERTURE - TWO HEATERS HIGH TEMPERATURE STORAGE WITH OR WITHOUT RECIRCULATION DANGER: INSET B INSET A TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURES AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 11. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. VACUUM RELIEF VALVE INSTALL PER LOCAL CODES. * PIPE RELIEF VALVE TO OPEN DRAIN NOTE: IF TEMPERED WATER IS RECIRCULATED, RETURN LIN
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TWO TEMPERATURE - THREE HEATERS (TWO PRE-HEATERS/ONE BOOSTER) WITH OR WITHOUT CIRCULATION INSET A INSTALL THERMAL EXPANSION TANK IN COLD WATER SUPPLY LINE, IF CHECK VALVE OR PRESSURE REDUCING VALVE IS USED IN SUPPLY. DANGER: INSET B TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURES AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 11. IF HIGHER PREHEAT TEMPERATURES VACUUM RELIEF VALVE ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR INSTALL PER LOCAL
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TWO TEMPERATURE-ONE HEATER HIGH TEMPERATURE STORAGE WITH RECIRCULATION OF SANITIZING LOOP NOTE 1: TOGGLE SWITCH CONTROLS 180°F WATER CIRCULATION. INSTALL ON OR CLOSE TO DISHWASHING MACHINE . TOGGLE SWITCH MUST BE CLOSED (ON) DURING THE INSET A RINSE OPERATION AND OPEN (OFF) WHEN DISHWASHER IS NOT OPERATING. INSTALL THERMAL EXPANSION TANK IN COLD WATER SUPPLY NOTE 2: INSTALL LINE TEMPERATURE CONTROL IN AN LINE, IF CHECK VALVE OR PRESSURE REDUCING VALVE IS UNINSULATED TEE BEYOND THE DISHWASHING US
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MANIFOLD KIT COMMERCIAL OIL FIRED WATER HEATERS Precision cut type "L" all copper A.O. Smith manifold kits assure water flow balance of all units. Without this balance, the full water heating and storage potential of the system cannot be achieved. Plus, the units with the higher water flow may have a shortened life. Unions and T & P valves shown in piping diagrams are not included in the manifold kits. Dimensions shown are for minimum space occupied by complete assemblies. Service space in
