Assessments - 2, GPA: 5
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UN•LIME is a patented food grade acid which is safe to handle and does not create the harmful fumes which are associated with other products. UN•LIME may be obtained from your dealer, distributor or the A. O. Smith Water Products Company. Order part no. 4763 (1 gal.), packed 4 gallons per case, or part no. 4813 (5 gal. container). CAUTION Observe handling instructions on label of product being used. REMOVING LIGHT DEPOSITS 1. Shut off electric and gas supply to the burner. 2. Close gate valves “A” and “B”. 3. Install drain hose assembly in upper deliming tee. Open drain cock and drain heater. Install standpipe in lower deliming tee or in tee from which pressure relief valve has been removed. 4. Close drain valve. 5. Slowly pour 3 gallons of UN•LIME into heater through standpipe. Direct solution into suitable container with a hose, see fig. 18. DELIMING THE HW WATER HEATER FIGURE 18 6. Continue to fill until foaming action stops. 7. When foaming action has stopped completely, allow 10 to 15 minutes for UN•LIME to dissolve any remaining scale in the heater. 8. Open the drain valve and drain all UN•LIME from the heater. 9. Remove standpipe and drain hose assembly from tees. Install fittings originally removed into openings. Open valve “A”, allowing fresh water to flow through heater and out drain valve for 3 to 5 minutes. 10.Close drain valve and open valve “B”. Heater is now ready for operation. HEAVY LIME DEPOSITS If the solvent does not readily pass through the clogged coils or heat exchanger, it will be necessary to use a deliming pump or contact a service agency for proper cleaning. A. O. Smith part no. 4930 motorized deliming pump kit, complete with pump, hoses, fittings, container and instructions, is available from your dealer, distributor or A. O. Smith Water Products Company. A. O. Smith Form No. 4778, entitled “All About Deliming Coil Type Water Heaters”, describes heater cleaning methods and equipment required. UN•LIME and the booklet may be obtained through your dealer, distributor or A. O. Smith Water Products Company. FIGURE 19 23 REMOVING SILICATE Ammonium bifluoride flakes (NH4FlHF) are used in conjunction with A. O. Smith UN•LIME delimer and pump type deliming kit, part no. 4930, to delime and remove siliceous materials from copper coil water heaters. CHECKOUT The checkout sequence should be used as an on-the-job troubleshooting guide to identify the cause of incorrect system operation and suggest a remedy for its correction. Because improper piping and wiring can result in unsatisfactory system performance, it is suggested that the installation be • The part no. 4920 pump contained in the deliming kit is equipped with a titanium shaft. This shaft will not withstand ammonium bifluoride solutions and must be replaced with a stainless steel shaft, part no. 4926. Ammonium bifluoride flakes should be purchased locally from chemical suppliers. Contact your dealer, distributor or A. O. Smith Water Products Company for additional information. examined before using the checkout procedure. Be sure to refer to the correct piping - wiring diagram and checkout for the type of system that is installed. The system should be filled with water, purged of air, valves properly set and utilities connected and ready to operate. CHART 1 - CER-TEMP 80 RECOVERY SYSTEM CHECKOUT PROCEDURE (Use this checkout for Cer-Temp 80 Recovery Systems) Checkout Sequence SYSTEM OPERATION Cause RemedyContact Incorrect Set tank temperaturecontrol 20° (11°C) below tank water temperature Circulating pumpand burner shut off. With thermal balancer, pump off delay of approximately 2 minutes. Pump and burner remain on. Tank temperature control differential wide. Reduce differential. Tank temperature control defective. System wiring is incorrect. Replace. Correct wiring. Circulating pump on. Pump wired for continuousoperation. Correct wiring. Burner on. See intermittent pilot system troubleshooting chart 2. Gas valve stuck or defective. Correct or replace valve. System wiring in incorrect. Correct wiring. Set tank temperaturecontrol 20° (11°C) above tank water temperature. Circulating pumpand burner on. Circulating pump on. Automatic gas shutoff control calibrated too low or differential too wide. Replace. (If problem proven to be at thiscontrol by applyingjumper to terminals.) If system has been inextended use it may have lime build-up. See preventive maintenance. System wiring is incorrect. Correct wiring. Gas valve or wiringdefective. Check wiring repair or replace valve. See intermittent pilot system trouble-shooting chart 2. Circulating pumpand burner off. Tank temperature control differential too great. Reduce differential. A 5° differential is generallyused. Power off or system wiring is incorrect. Check power supply and wiring. Tank temperature control defective. Replace. See intermittent pilot system trouble-shooting chart 2. Burner on. System wiring is incorrect. Replace. See intermittent pilot system trouble-shooting chart 2. H...
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