State Industries STC-080 User's Manual
Contents
1. WHY WATER HEATER TANKS LEAK Continued WATER CONDITIONS Hard Water Hard water contains minerals Flush the sand from the tank every 6 As water is heated the minerals months separate from the water and Delime the tank interior yearly attach to hot surfaces within the Install a water softener in hard water tank In gas water heaters these areas These should be adjusted minerals insulate the heat according to manufacturer s transfer surfaces conducting heat recommendations typically for 5 grains from the burner through to the hardness water These surfaces become hotter than if they were clean Hotter surfaces mean more expansion and contraction of the metal as the burner cycles on and off The metal or weld joints crack Water Water stored at 160 F 72 C Begin with a water heater setting of Temperature may be twice as corrosive as 120 F 49 C and increase only as water stored at 140 F 60 C necessary Usage Each time the burner or elements Purchasing a proper sized tank will cycle on and off a small amount minimize burner or element operation of metal expansion and when only small quantities of hot water contraction take place As are used bending a piece of wire back and forth will break the wire this expansion and contraction will eventually crack tank joints or welds State Water Heater 24 Technical Training Department 2004 Ashland city TN RESIDENTIAL G2. A percentage of the total BTU passes out through the vent piping Temperature rise is the increase in the temperature from its coldest inlet water temperature to the desired hot outlet setting Typically this is assumed to be 40 degrees entering water 120 degrees desired stored water or 80 degrees temperature rise Standby efficiency the water heater s ability to contain heat in the tank A minimum of tank water heat loss per hour is desired Sample temperature change Btu h loss square foot of tank surface R value Water cannot for all practical purposes be compressed Water expands when it is heated State Water Heater 2 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK Water Hammer is a concussion of moving water against the sides of a containing pipe or vessel on a sudden stoppage of flow EX 1 2 copper pipe 5GPM flow 7 2ft sec stop Pressure rise of approximately 412 PSI 3 4 copper pipe 5GPM flow 3 3ft sec stop Pressure rise of approximately 188 PSI Minerals and gases will separate from water as temperature increases Formulas Btu British Thermal Unit is the heat required to raise 1 pound of water 1 F 1 BTU 252 cal 0 252 kcal 1 cal 4 187 Joules BTU X 1 055 Kilo Joules BTU divided by 3 413 Kilowatts To convert from Fahrenheit to Centigrade F 32 times 5 9 or 556 equals degrees C O
3. Bulletins 26 RESIDENTIAL GAS SERVICE HANDBOOK INTRODUCTION This service handbook is designed to aid in servicing and troubleshooting State Non Power Vented Residential Gas water heaters in the field No duplication or reproduction of this book may be made without the express written authorization of the manufacturer The following text and illustrations will provide you with a step by step procedure to verify proper installation operation and troubleshooting procedures Additional quick reference data is included to assist you in servicing this product The information contained in this handbook is designed to answer commonly faced situations encountered in the operation of the Residential Gas non power vented product line and is not meant to be all inclusive If you are experiencing a problem not covered in this handbook please contact the State Water Heater Call Center at 1 800 365 0024 or your local State Water Heater Service Representative for further assistance Additional information is also available on the web site www Statewaterheaters com This handbook contains supplemental information to the Residential Gas installation instructional manual supplied with the water heater Qualifications This handbook is intended for use by licensed plumbing professionals and reference should be made to the instructional manual accompanying the product State Water Heater 1 Technical Training Department 2004 Ashland c
4. Current Conductors It i Flexible Tube with Y Metal A Insulated Wire Inside Tube Gas Inlet F Metal B Brazed Cold Junctions Electromagnet To Main ei Brazed Joint Thermocouple Thermocouple Connection Compression Sleeve Thermocouple and Nut See also C3 technology product information beginning on page 15 State Water Heater 7 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK Residential Gas continued Temperature Two metal probes mounted onto the back of the control are immersed Temperatu bes inside the tank water One probe the Adjustment shorter acts as a temperature high limit If Knob water gets excessively hot a sensor within the probe opens interrupts the small electrical current to the gas valve and gas flow through the control is interrupted If this Pilot and safety sensor opens the entire control must On Off Pilot be replaced Main Gas JE Knob Regulators The longer probe contains a metal rod that Built in expands and contracts as water temperature monadjustable around the probe cools and heats As the rod expands it pushes against a lever Length actuated gas valve If the regulator is pushed sufficiently gas flow is interrupted to the main burner Adjusting the temperature dial changes the distance the rod must High Limit expand or contract to open or close the gas Probe valve T
5. and fit Main burner tube seal condition and fit Pilot assembly seal condition and fit Sight glass condition present not broken or cracked Straight routing of the thermocouple and pilot burner tube through the pilot assembly seal a p These are all critical to maintaining the C3 TECHNOLOGY integrity of the combustion chamber State Water Heater 21 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK PIEZO IGNITER C3 TECHNOLOGY models will feature a Piezo igniter to light the pilot burner The push button switch will be located on the top of the gas control valve There will be a plug connector between the push button and the igniter wire which is part of the pilot burner assembly Gas Control wahe Push Button Plug connector Important Service Reminder Any time service is performed on C3 TECHNOLOGY product the Five Point Inner Door Seal Inspection outlined in the Sealed Combustion Chamber section should be performed and the LDO Screen s should be inspected for proper installation arrows up and cleaned before leaving Other features All C3 TECHNOLOGY models will feature Green Choice by having a low NOx nitrous oxide burner which meets SCAQMD rule 1121 All C3 TECHNOLOGY models will have a brass drain valve standard See the Technical Bulletins Section of this manual for explanations of Water Hammer Mineral Buildup Aluminum Hydroxide
6. floor waxes detergents salt and many other household products contain chemicals which when drawn into contact with a flame a gas water heater uses 12 cubic feet of air for each 1000 BTU of heat generated When these chemical vapors or dusts come into contact with a flame or electrical contact various acids form These acids attack the metal Soft water minimizes mineral buildup within the tank Minimal minerals maintain the water heater at high efficiency but may also expose interior surfaces to corrosion Mineral buildup in some heaters prevents them leaking while greatly reducing efficiency State Water Heater 23 2004 A Temperature and Pressure Relief Valve limits pressure to a maximum Adding a Thermal Expansion Tank limits pressure to near supply water pressure Install a water heater with capacity to minimize significant stored water temperature drop during usage Store water at a higher temperature install a mixing valve to reduce danger of scalding Supply the heater with clean air Direct Vent water heaters use air from outside of the building for combustion A metal Anode rod within the tank helps to prevent internal corrosion Maintain the self sacrificing anode rod by inspecting the rod annually and replacing when large gouges appear in its surface Technical Training Department Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK
7. AS NON POWER VENTED WATER HEATER GENERAL EFFECTS THE FIX State Water Heater 2004 SERVICE HANDBOOK TECHNICAL BULLETIN 11 WATER HAMMER Water hammer is the destructive forces pounding noises and vibration in a piping system when water flowing through a pipeline is stopped abruptly When water hammer occurs a high intensity pressure wave travels back through the piping system until it reaches a point of some relief The shock wave will then surge back and forth between the point of relief and the point of stoppage until the destructive energy is dissipated in the piping system The violent action accounts for banging thumping and or intense vibration in the pipe line Although noise is generally associated with the occurrence of water hammer it can occur without audible sound or noise Quick closure always causes some degree of shock with or without noise The common cause of water hammer is single lever faucets sinks lavatories or automatic solenoid valves dishwashers washing machines etc The speed of the valve closure time is directly related to the intensity of the surge pressure The damage from water hammer can manifest itself in a number of ways The most common are Expanded Tank Shell This can be demonstrated by measuring the circumference at various locations along the shell Pressures in excess of the maximum design working pressure can cause permanent deformation of the shell Collapse
8. Condensation Discolored Water Smelly Water Chlorination Process Lack of hot water Thermal Expansion Temperature and Pressure Relief Valve Operation Parts Replacement The parts on these models may change due to improvements changes in the products To order the current correct replacement part for your model gas water heater you must know the model number and complete serial number of your water heater This information will be located on a black and white label on the front of your water heater This label will also display a star within a circle the CSA symbol To order parts contact your local State Water Heater Contractor or Distributor phone State parts at 800 821 2018 or contact State on Web site www statewaterheaters com State Water Heater 22 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK WHY WATER HEATER TANKS LEAK WHAT PREVENTION Water Pressure Condensation Contaminated Air Soft Water Water expands when it is heated Thermal Expansion Water cannot be compressed Excessive Pressure in the tank causes failure of joints welds or gaskets Products of combustion contain moisture As the combustion products cool the moisture becomes liquid carbonic acid The acid attacks the metal Higher efficiency water heaters have cooler gases Recommended water storage temperatures create cooler surfaces Bleaches
9. E 30 gallons 18 gallons 40 gallons 24 gallons 50 gallons 30 gallons 75 gallons 45 gallons 100 gallons 60 gallons STEP 8 At the same faucet using a candy thermometer measure the water temperature STEP 9 The temperature should be about 30 F below the temperature in step 6 THE FIX Step 6 if the temperature was not within range check the thermostat Step 9 if more than 30 F was lost check the dip tube State Water Heater 31 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK TECHNICAL BULLETIN 45 THERMAL EXPANSION SYMPTOMS Effects are only noticeable after hot water use followed by periods of no water use Relief valve drips during any recovery cycle when no hot or cold water is used Hot water pipes creak while heater is recovering and all valves are closed Tanks or other components of the water supply system fail prematurely A metallic creaking noise might actually be heard in the location of the heater as the pressure is relieved and the stretched tank returns to a natural shape e Faucets drips during any recovery cycle when no hot or cold water is used Water surges when a valve is first open and then pressure drops The water in a water heating system expands when it is heated and has a greater volume Since water will not compress like air system designers must include provisions for thermal expansion Water in a closed tank at 50 p
10. E RELIEF VALVES be PRESSURE REDUCING e ae 7 NE VALVE IS USED IN SUPPLY ay State Water Heater 14 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK Residential Gas continued Exhaust Venting Notes Follow current National Fuel Gas Code requirements for proper installation D Typically same or larger diameter as Draft Hood outlet L Horizontal piping slopes upward 1 per foot from heater to chimney or vertical vent Length of horizontal not more than 75 of H H Not less than 5 feet Maximize vertical distance to first elbow FLAMMABLE VAPOR IGNITION RESISTANT FVIR DESIGN This section will address the changes brought about by the introduction of FVIR compliant products Other than items mentioned here the construction installation and service will remain the same as discussed in the primary handbook The FVIR acronym stands for Flammable Vapor Ignition Resistant The State products are based on Corderite Combustion Containment known as C3 Technology The C3 Technology design features a sealed from non designated air intake openings combustion chamber and a flame arrestor component This class of residential gas water heaters meet the new ANSI standards and testing protocols ANSI Z21 10 1 established to deal with the accidental or unintended ignition
11. SERVICE HANDBOOK FOR STANDARD RESIDENTIAL GAS WATER HEATERS NON POWER VENTED MODELS O Nay a 6state WATER HEATERS Printed in the USA 0604 15 00 Part Number STC 080 This service handbook addresses service issues associated with Standard Residential Gas Water Heaters Includes C 3 Flammable Vapor Technology RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK TABLE OF CONTENTS Page Page Introduction SEIVICG cccccecccsccccvcucecscsucucacsesuavcuceuaceueuas 10 TOVINS ccccccccccccccesccesccesecessecesecssectssesseecuseeane 1 Procedures and Conditions 0 11 TOOIS cccccccccccecscccesccecssccesseccessecetseceesseeessnees 2 Multiple Heater PIping ccceeeeeeees 14 Exhaust Venting Notes 0 ccccceceees 15 Residential Gas Water Heaters l Guidelines 3 Flammable Vapor Ignition Design 15 ri a Lint Dust amp Oil Screen 16 EE E EEA Elame Arrestor TUUTUU a Thermal Cut Off Switch 18 i ter and Servicing Pilot Burner Assembly ce 0 c0e000 19 etl daa EE E E T A E A o Sealed Combustion Chamber SENERS 20 stelle POE EAE EE EATE ETES Piezo IQNtel eecccccccccesescseeeceeseeeee D4 Normal Operations cccccseseeceeeeeeeeeees 7 Temperature aa ricaccntscciontevurdeeeeccuscnsesnenceande 8 eS PEIE ett ences one ea ene sam ane 8 f i Water FlOW ccccccccscsssessessessssessessessesseseceeeee 9 Technical
12. ULLETIN 23 CHLORINATION PROCEDURE The chlorination procedure is used to eliminate various bacteria that accumulate and grow in water heaters These bacteria often cause odorous or discolored water conditions PROCEDURE Please read the steps of the chlorination procedure prior to beginning If you feel uncomfortable performing any of these steps contact a service person to perform this procedure for you Using a funnel in the anode opening add one gallon of household chlorine bleach e g Clorox or Purex for every 25 gallons of tank capacity STEP 7 Reinstall anode rod s after inspecting and replacing as needed STEP 8 Open cold water supply valve and refill the system Then draw the water to every hot water fixture until the smell of chlorine is detected Operate dish and clothes washers until a noticeable amount of the chlorine is detected as well All hot water lines must receive treatment STEP 9 Leave the chlorine solution undisturbed for one hour or more 4 STEP 11 Close the drain valve and refill the tank Allow the tank to sit for 15 minutes Repeat steps 2 3 and 4 Continue to flush the tank if the water is discolored or contains a chlorine odor Close the drain valve and refill the tank Flush all chlorine from the piping by opening every hot water outlet appliance STEP 13 Return hot water heating system to service by following the recommended Start up procedure posted on the unit or in the manual Stat
13. a few isolated parts of the United States where the water supply has a relatively high pH 8 water conditions will react with the aluminum anode to form excessive amounts of aluminum hydroxide on the anode and in the bottom of the tank Aluminum hydroxide looks like jelly beads or a green blue or gray gel like substance in the heater drain or at faucet aerators THE FIX This procedure should only be performed by someone with abilities equal to a licensed tradesman Aluminum hydroxide can be removed by using one of the methods outlined 4 Add UN LIME to the tank 20 40 gallon models use 3 gallons of UN LIME 41 65 gallon models use 5 gallons of UN LIME 66 100 gallon models use 7 gallons of UN LIME On electric models be certain the lower element is immersed in solution 5 Heat the UN LIME to a temperature between 140 F to 160 F e GAS Heat for 7 to 10 minutes 7 Allow the heated UN LIME to stand for up to 12 minutes y O Fill the system with water SSS Turn heater fuel ON If tank is new with no lime build up to any degree 1 Turn off the heater Remove the anode 3 Flush the tank thoroughly with water anode identifiable by weld bead on plug If the tank is new with lime build up to any degree 2 ee NOTE Since aluminum hydroxide is a product of a chemical reaction dependent on the water condition any treatment is not considered warranty related State Water Heate
14. adically discharged from the relief valve The temperature and pressure relief valve T amp P is a safety device limiting temperature and pressure levels in a water heater Each T amp P has both a temperature and pressure rating Normally the temperature and pressure relief valve will have a temperature rating for 210 F A probe part of the relief valve extends into the tank measuring the stored water temperature This probe must be within the top six inches of the water heater However if the water heater s thermostat malfunctions higher than normal water temperatures could be produced Once the probe senses a temperature exceeding its temperature rating the relief valve will open to full capacity releasing very hot water until the temperature is below its reset temperature The pressure rating on the relief valve should be the same or less than the certified working pressure of the tank generally 150 psi and be below the lowest pressure rating of any system components It is not acceptable to install a relief valve that exceeds the maximum working pressure of the water heater Once the pressure in the tank reaches the valve s pressure rating it will slightly open relieving the pressure Relieving of pressure can be noted as dribbling or weeping water from the relief valve If an incorrectly sized temperature and pressure relief valve is installed the warranty will be void Seeping at the soud of the water heate
15. allation Must Follow Local Codes and Instruction Manual Guidelines State Water Heater 5 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK RESIDENTAL GAS WATER HEATER SERVICE This portion of this manual applies to the Operations and Servicing of Residential Gas Tank Type Water Heaters which are vented atmospherically and use a thermocouple as their electrical source Draft Hood Anode Rod Foam Fill Hole Flue with Baffle Hot Water a _ Cold Water Outlet f Inlet Glass Lining Anode Dip Tube Foam Insulation Flue Baffle Thermostat Boiler Type Drain Valve Filat Burner pu Combustion J Air Holes Control There is one control on this style of water heater The control has a main gas regulator pilot gas regulator on off pilot knob controls water temperature has a temperature adjustment knob and a high water temperature limit safety Air Intake Slots Ring Base Temperature FRONT VIEW Adjustment On Off Pilot Top Knob renye Pilotand seemed On OffiPilot Main Gas ete A Regulators Built in nonadjustable i Supply Length Gas e T Setting Indicator Hot is about 120 F High Limit Probe o delta Note The word Hot may or may not be present on the control knob Temperature Probe ____ Water Temperature Adjustment Knob TOP VIEW State Water H
16. chamber and or flue check for lack of supply air are sooted the main burner chamber and flue are sooted check the following incorrect orifice excessive gas pressure loose main burner cross threaded orifice gas control valve gas seepage loose gas connection in burner assembly Electrical Testing This type of water heater has its own electrical generating system When two dissimilar metals are joined together and this joint is heated a small electrical current will be produced A thermocouple uses this science POWER UNIT CAP TO GROUND Thermocouple output test Procedures Conditions Meter set for DC millivolt testing Test from lower ECO emergency cut off or energy cut off solder joint to ground Note If pilot will not stay lit manually hold the top knob down in the pilot position This allows gas to flow to the pilot Light the pilot and continue to hold this knob down while conducting the test reading test of at least 13 mV is not present e check that flame contacts end of thermocouple e replace thermocouple reading test of at least 13 mV is present continue to next test State Water Heater 12 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK Residential Gas continued Electrical Testing continued Millivolt dropout test through copper magnet winding and ECO Emergency Cut Off Procedure Move meter probe t
17. closed the pressure will start to climb steadily and rapidly A small amount of thermal expansion control may be built into the system because of trapped air pockets or a water hammer arrestor In that case the pressure will increase slightly hold steady for a short time and then rapidly increase The temperature and pressure relief valve T amp P or PRV should open and release water once the pressure reaches the maximum setting on the valve The valve will close once the pressure falls below the pressure setting of the valve State Water Heater 32 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK THE FIX The ideal fix involves the use of a pressure reducing valve if supply pressures are above 60 to 70 psi and a properly sized expansion tank The PRV reduces supply pressures to 40 to 60 psi allowing an economically priced and sized expansion tank to be used The PRV also offers the benefit of saving water and prolonging the life of water flow valves The PRV is not required if the system already has one or if high supply pressures are desired The PRV is installed between the check valve and the water heating system The expansion tank is installed between the PRV and the water heating system Follow the manufacturers instructions for installing the expansion tank Run the thermal expansion check again The pressure should increase only slightly then hold steady thro
18. d Flue Tube This will choke off the ability to vent the products of combustion causing the flame and or combustion to spill out from the combustion chamber Often this will occur where thinning of the flue tube walls has occurred due to contamination of the combustion air or because of excessive condensation Inverted or Deformed Tank Heads Often this accompanies collapsed flues but one or both heads can be deformed The only effective means of control is to install water hammer arrestors These devices have diaphragms which separate an air chamber from the water in the piping system As the shock wave reaches this device the air chamber absorbs the shock Arrestors should be located as close as possible to the source of the shock wave Since water hammer exposes the equipment to pressures in excess of its design limits failures caused by water hammer are not eligible for warranty consideration 25 Technical Training Department Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK TECHNICAL BULLETIN 13 SYMPTOMS THE FIX State Water Heater 26 Technical Training Department 2004 MINERAL BUILD UP e Rumbling e Crackling e Popping With the advent of high input and larger storage tanks in both commercial and residential heaters deliming has become a necessity of modern maintenance Lime CaCQs is the most notable factor when discussing water hardness Lime is present in every water s
19. e Water Heater 30 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK TECHNICAL BULLETIN 35 NOT ENOUGH HOT WATER GAS Not enough hot water complaints are becoming more frequent in the water heater industry This increase was triggered when changes required by our regulatory agencies were implemented For example heaters are now factory preset at a lower temperature and inlet tubes have been shortened While lower temperatures settings reduce the burn rate and shorter dip tubes guard against stacking both affect the amount of hot water a water heater can supply The following test will help determine if a water heater is supplying the intended amount of hot water and will help pinpoint any problems that exist TEST Please read all the steps of the test prior to beginning If you feel uncomfortable performing any of these steps contact a service person to conduct this test for you STEP 1 At the faucet nearest to the water heater time in seconds how long it takes to fill a 1 gallon bucket flow rate Gallon per minute gom 60 seconds seconds to fill a 1 gallon bucket If the bucket fills in 10 sec 6 gpm 12 sec 5gpm 15 sec 4 gpm 20 sec 3 gpm 24 sec 2 5 gpm STEP 2 Turn thermostat dial on the water heater so the arrow points to A position STEP 7 Continue running the hot water until 60 of the tank capacity is depleted CAPACITY DEPLET
20. eater 6 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK Residential Gas continued Burner The burner assembly consists of the main burner main burner orifice main burner gas supply tube pilot burner pilot burner orifice pilot burner gas supply tube and thermocouple The pilot burner remains on once it is manually lit When incoming cold water activates the thermostat gas flows to the main burner The pilot flame ignites this gas The main flame burns until the tank reaches set temperature then the thermostat interrupts this main gas flow Main Burner Tube __ Main Burner Pilot Tube Pilot Orifice Main Orifice AFTER HAVING CONFIRMED THAT THE WATER HEATER HAS BEEN INSTALLED PER THE INSTALLATION MANUAL INSTRUCTIONS Normal Operation Electrical The Pilot Flame heats the end of a thermocouple As the thermocouple is heated it generates a small cannot be detected without an electrical meter electrical current to the bottom of the control valve This current powers the electromagnet and holds open the safety valve as long as the pilot flame is heating the thermocouple DANGER If the pilot is extinguished it can take up to 180 seconds for the thermocouple to cool sufficiently to close the safety valve Tinned Connector LOUPE Lead Welded Hot _ Attaching Nut oN Hot Junction Main Gas interrupter A Metal N eB i NJI ri A Insulator
21. emperature Probe ____ TOP VIEW Gas When you prepare to light the pilot you are instructed to turn the top knob to the pilot position and depress the knob When the knob is depressed gas will flow to the pilot Top Knob Main Regulator burner only You then have to selip manually ignite this pilot gas When Pilot Gas the pilot is lit the flame must heat the Regulator thermocouple until it generates Gas Inlet gt sufficient electricity to the gas valve to allow you to release the knob while Electromagnet gas continues to flow to the pilot Valve Closed When the top knob is turned to the Te To Main To Pilot ON position gas is also available to Burner Burner the main burner if the thermostat calls for heat State Water Heater 8 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK Residential Gas continued Water Flow When a hot water faucet is opened water pressure from the well tank or street main forces cold water into the water heater This pushes hot water out of the tank 2 a 5 Water Supply To Cold Fixtures g Hot Za Gas Supply Operation A residential water heater is not a precise operating appliance Because the water heater relies on the expansion and contraction of a metal rod when the thermostat dial is set at an indicated setting A is recommended as a starting setting This is approximatel
22. ficiency means that an increased amount of heat is transferring from the flue gas into the water If you transfer approximately 87 5 or more the moisture in the flue gas will condense State Water Heater 13 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK Residential Gas continued Condensation is a mild acid it will corrode steel Condensation is usually noted when e water dripping is heard only while the main burner is on there is water around the heater just after the heater has been operating there are small black or red granules on the main burner or top of the heater or corroded jacket or vent piping is noted any of the above conditions exist raise the supply air temperature or increase stored water temperature or increase the size of the tank You would not wish to lower combustion efficiency this would waste gas Use materials stainless steel PVC etc that will not be affected by the condensation Suggested Multiple Heater Water Piping Required For Proper Operation of Top Connect Models Installed in accordance with local codes RETURN LINE m IF USED am _ Jun lt CHECK VALVE BALL VALVE 5 Na D D P ip i n a OUTLET AT STORED TEMPERATURE lt lt N BALL VALVE INSTALL THERMAL Bote ae F n EXPANSION TANK ON COLD Pl n h WATER SUPPLY LINE IF E ea CHECK VALVE OR TEMPERATURE PRESSUR
23. h the small ports of the flame arrestor and into the combustion chamber In the event flammable vapors are introduced accidentally into the combustion chamber the flame arrestor is designed so any flames burn off the top surface of the arrestor and cannot escape down through the arrestor The arrestor works somewhat like a check valve eth 06 06 8 12 een eases see SEB EBERSECCEREREBEC EE EE EE Se Ce SSSR SSE Se Se ee 8 ee ee a r e a ee a oe a a a a a E ETETE TITETETITETTEITIETET Close up view of Corderite flame arrestor material Service Inspect the bottom ports of the flame arrestor by removing the LDO screen s and using a mirror and flashlight Clean the ports if necessary by vacuuming the bottom of the arrestor Inspect the top of the flame arrestor by removing the inner door and burner assembly Lift the heat shield located on the bottom of the chamber Inspect with the mirror and flashlight Vacuum or blow down any blocking material If you blow down through the ports be certain to also vacuum below the arrestor State Water Heater 17 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK lf there has been a flammable vapor ignition a qualified service agent needs to inspect the arrestor for cracks The arrestor is not a replaceable part the heater would need to be replaced Possible service issues associated with the flame arrestor e Poor c
24. ined a flammable vapor ignition The TCO will open and the chamber and arrestor should be inspected by a qualified service agent ONE PIECE PILOT BURNER ASSEMBLY C3 Technology models feature a one piece pilot burner assembly There are five main components that make up this pilot assembly 1 Thermocouple with integral Thermal Cut Off switch TCO 2 Pilot burner w orifice and tubing 3 Piezo igniter cable 4 Pilot assembly seal grommet orange 5 An inner door gasket white will also be included State Water Heater 19 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK Complete Pilot Burner Assembly f n Pilot Assembly Pilot burner eae Seal Grommet F ie a i To replace a pilot assembly 1 Turn off the gas supply 2 Disconnect the piezo cable from the piezo button connection near gas control valve 3 Disconnect the pilot tubing thermocouple and main burner tube from the bottom of the gas control valve 4 Remove 2 3 8 inch nuts securing the inner door 5 Remove the entire burner assembly 6 Remove screw securing pilot burner assembly to pilot mounting bracket 7 Remove pilot assembly with orange gasket from the back side of the inner door 8 Reinsert new pilot assembly into back side of inner door Wetting the orange gasket may help in securing the gasket into place 9 Reattach the new pilot assembly to the pilot mount
25. ing bracket 10 Inspect replace the white inner door gasket before making the connections to the bottom of the gas control valve 11 Reattach the piezo cable to the piezo button 12 Remount the inner door 13 Follow the pilot lighting instructions including gas and gasket leak checks 14 Install the outer door SEALED COMBUSTION CHAMBER The combustion chamber is factory sealed around the flame arrestor and the upper and lower perimeter of the chamber Access for service is provided through an inner door as with current product However this inner door is now sealed with a door gasket a pilot assembly grommet type seal and a main burner tube boot sleeve type seal State Water Heater 20 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK The three seals on the inner door should be checked every time any service is performed The sight glass should be checked to insure it is not damaged or missing The pilot tube and thermocouple routing should be straight not bent at an angle close to the surface of the seal as it passes through the pilot assembly seal A five point inner door seal inspection is outlined below 1 Inner doors yasket 4 Pilot assembly seal Correct routing of pile Incorrect reuling of pikt Jube and thanmorccuple fobs and thence ipl J Pilot assembly seal Five point inner door seal inspection Inner door gasket condition
26. ity TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK Tools Required Phillips head screw driver 3 8 7 16 inch open end wrenches 3 16 inch Allen wrench 11 16 inch 6 point socket for anode removal set of marked drill bits electrical multimeter gas pressure gauge or monometer water pressure gauge thermometer tubing cutter if pilot tube is to be replaced hose to drain tank container to measure gallons per minute flow MISCELLANEOUS INFORMATION Draw efficiency is the quantity of hot water available to the consumer before the outlet water temperature decreases 25 degrees F A 40 gallon water heater will typically provide 70 28 gallons of this usable hot water The burner is allowed to operate during this test Incoming cold water mixes the remaining stored water below this 25 degree limitation Energy Factor is an indicator of the combined thermal efficiency and standby efficiency of a water heater The higher the energy factor the more efficient the water heater will be Recovery rate is the amount of water that is heated to a set temperature per hour An example might be that a water heater has a recovery rate of 30 gallons of water per hour at 80 degree F Fahrenheit temperature rise R Value is a measure of the resistance of a substance to heat flow Thermal efficiency is approximately the amount of generated BTU British Thermal Units which enters the water
27. lso include the long narrow crevice accessory LDO SCREEN LINT DUST OIL SCREEN S An easy to clean screen designed to minimize lint dust and oil based contaminants from being drawn into the Flame Arrestor along with make up combustion air There may be one or two of these screens The LDO screen must be installed with the arrows on the right and left side facing up to function properly The arrows are located on two mounting tabs on each side of the screen Service Inspect the LDO screen s regularly Clean or wash as necessary Pulling the tab located in the middle of the screen will remove the screen Reinstall the clean screen by inserting the end tabs into the jack with the arrows pointing up Possible Service issues associated with a blocked screen e Poor combustion yellow flame possible sooting e Pilot outage resulting from a lack of oxygen e Pilot outage resulting from to increased combustion chamber temperature below the main burner This may open the automatic reset thermal cut off switch TCO State Water Heater 16 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK FLAME ARRESTOR Made from Corderite a fireproof ceramic material the flame arrestor is built into the base of the water heater Combustion air is drawn in through the LDO screen s After entering the bottom area of the water heater this air passes up throug
28. ne gallon of 120 F 49 C water weighs approximately 8 25 pounds Pounds X 45359 Kilogram Gallons X 3 7854 Liters Of Hot Mixed Temp Cold divided by Hot Temp Cold Thermal Efficiency GPH X 8 25 X Temp Rise X 1 0 divided by BTU H Input Btu Output GPH X 8 25 X Temp Rise X 1 0 GPH BTU H Input X Eff divided by Temp Rise X 8 25 One cubic foot of Natural Gas contains about 1000 BTU of heat One therm is equal to 100 000 BTU One cubic foot of Propane Gas contains about 2500 BTU of heat One gallon of Propane gas contains about 91 250 BTU of heat One pound of Propane gas contains about 21 600 BTU of heat One pound of gas pressure is equal to 27 7 inches water column pressure Inches of Water Column X 036091 PSI Inches of Water Column X 073483 Inches of Mercury Hg State Water Heater 3 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK Centimeters Inches X 2 54 MM millimeters Inches X 25 4 Meters Inches X 0254 Doubling the diameter of a pipe will increase its flow capacity approximately 5 3 times CONSTRUCTION Tank is constructed of steel The inside of the tank is constructed of a glass lining bonded to the steel This prevents water to metal contact and rusting of the tank An anode rod will be installed within the tank The hex head plug end of the anode is visible on the top of the water heater Thi
29. o upper ECO solder joint and ground reading of at least 10 mV is not present replace the control valve reading of more than 10 mV is present but replace the control valve gas to the pilot shuts off each time knob is released Safety drop out test The safety gas shutoff should interrupt gas through the valve when mV current drops to 1 3 mV Procedures Meter still connected to upper ECO solder joint and ground Turn Top Knob to off position E fj Millivolt output will decrease as thermocouple cools Sica UPPER E C O T TERMINAL POWER UNIT CAP TO GROUND gt internal safety does not activate between 1 replace the control valve and 3 mV you will hear a click inside the valve internal safety does activate between 1 and valve is within tolerance and will interrupt gas 3 mV flow if pilot looses heat or ECO opens Note A click sound should be heard from the valve as the main gas interrupter snaps up to the closed position Condensation Flue gas products contain moisture If these flue gas products are cooled to their dew point they become visible moisture condensation Flue gas may become cooled by e Cold supply air temperatures e Cool surfaces generally if tank water temperatures drop below 110 F the flue pipe surface and or bottom tank head will be cool enough to cause condensation e Increased combustion efficiency higher thermal ef
30. of flammable vapors such as those emitted by gasoline Virtually all gas fired atmospherically vented residential water heaters manufactured in the United States with BTU ratings of 75 000 or less are required to meet this new ANSI standard effective July 1 2003 The current implementation schedule for C3 TECHNOLOGY compliant residential gas fired products is shown in the following table These dates are subject to change State Water Heater 15 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK IMPLEMENTATION ANTICIPATED CLASS OF PRODUCTS CATEGORY INTRODUCTION INCLUDED IN THIS CATEGORY Phase July 1 2003 30 40 and 50 gallon atmospheric vented July 1 2004 Can Manufactured housing models are excluded 30 40 and 50 gallon power vented models Manufactured housing models are excluded All other gas fired models with inputs of 75 000 BTU or less Subject to change This supplement addresses the July1 2003 compliant products Phase Il January 1 2005 Phase III July 1 2005 In addition to the standard water heater design discussed in the main service handbook the C3 Technology design also includes e ALDO Lint Dust and Oil screen over the combustion air intake e A Flame Arrestor e Acombustion chamber Thermal Cut Off TCO limit An additional tool for these products might be a vacuum cleaner with both blowing and vacuuming capabilities A
31. ombustion yellow flame sooting possible carbon monoxide production e Pilot outage due to lack of oxygen Continued pilot outage or finding that the LDO screen s is heavily blocked would warrant inspection of the flame arrestor e Pilot outage due to increased combustion chamber temperatures below the main burner This may open the automatic reset thermal cut off switch TCO e The flame arrestor having contained a flammable vapor ignition The TCO will open and the chamber and arrestor should be inspected by a qualified service agent COMBUSTION CHAMBER TEMPERATURE SENSOR The C3 Technology water heaters will come equipped with a thermal cutoff TCO device that is integral with the thermocouple Temperature cutoff points range from 160 C to 200 C depending on model The TCO is an automatic reset thermal switch When activated it will open the thermocouple circuit and shut off the main and pilot burner gas flow The pilot would have to be relit after the TCO has had sufficient time to cool down sensor is below 120 degrees F In addition to printing the temperature setting on the TCO a label located near the gas valve attachment end of the thermocouple notes the temperature setting of the TCO The TCO performs two primary functions e Inthe event of flammable vapor ignition inside the combustion chamber it senses the corresponding increase in temperature and shuts off gas flow to the main and pilot burners e f excessive tempe
32. r Spuds are welded to the tank and are not repairable The heater should be replaced Leakage at the threaded relief valve connection Remove relief valve and reseal connection Intermittent weeping and or dribbling at the relief valve The relief valve relieves water slowly when actuating on pressure A closed system can cause pressure to increase in the system This condition is called thermal expansion For additional information regarding thermal expansion please see Bulletin 45 Large volume of hot water sporadically discharged from the relief valve The relief valve relieves water quickly when actuating on temperature The only cause of this problem is a malfunctioning thermostat State Water Heater 34 Technical Training Department 2004 Ashland city TN To order additional copies of this Service Handbook and to view other service and presentation literature and CDs that are available from State Water Heaters Telephone 1 800 821 2017 Fax number 800 644 9306 or visit our web site at www statewaterheaters com For additional information or assistance in servicing you re State water heater visit our web site or telephone the Technical Information Department at 1 800 365 0024 This Service Handbook was prepared by the Technical Training Department Ashland City TN
33. r L Se Enters gt Here 1 000 roper BTU Combustion Fuel Combustion ot Enters Here Do not forget that your gas or oil furnace and gas clothes dryer also require a like amount of alr When calculating air supply provisions also consider the presence of whole house exhaust fans or other exhaust fans competing for the same air supply Air must be allowed to enter the heater chamber from the base of the heater and also enter the flue vent from below the draft hood Do not block these areas with insulation blankets or obstructions lying around the base of the heater Lack of Oxygen If a sufficient supply of oxygen air is not available for combustion and dilution the result will be e Pilot outage e Yellow burner flame e Sooting water heater State Water Heater 10 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK e Possible carbon monoxide e Smell of burnt gas in the room Residential Gas continued The instruction manual gives guidelines under Air Requirements and Unconfined or Confined Space sections If you want to test for a lack of air 1 Turn on every appliance and fan that exhausts air from the utility room and or house Make sure all windows and doors are closed as well as chimney dampers 2 Open a hot water faucet so that the main burner will ignite 3 Remove the outer door of the water heater not
34. r 27 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK TECHNICAL BULLETIN 21 DISCOLORED WATER SYMPTOMS Rusty brown black or yellow water appearing in the hot water Complaints of discolored water are commonly blamed on water heaters and storage tanks but in fact it is a rare occurrence for today s high quality glass lined tanks to have a lining failure significant enough to allow water to contact enough bare metal to discolor the contents of even a small tank The most common cause of rusty water is a non toxic iron reducing bacteria scientifically termed Crenothrix Leptothrix and Gallionella Iron bacteria is commonly found in soil water wells water treatment plants and water distribution piping systems where soluble iron exceeds 0 2 ppm higher levels make conditions even more favorable Soluble iron in the water provides food for the bacteria Rusty discolored water is the end result of the bacteria feeding process Water heaters and storage tanks usually require new anode rods as presence of iron bacteria contributes to premature anode failure The requirements for the bacteria to thrive are e Elevated level of iron and manganese in the water e Water with little or no dissolved oxygen e Temperatures below 138 F ltems that can increase the potential for this bacteria are e Water softeners e Well water e Long periods of no water movemen
35. ratures inside the combustion chamber indicate poor combustion due to a clogged LDO screen or inadequate air for combustion the TCO will shut off gas flow to the main and pilot burners ET 190 C TCO 160 C TCO State Water Heater 18 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK SERVICE There is no routine service associated with the TCO The standard thermocouple millivolt output checks described in this service handbook still apply Millivolt readings indicate that the TCO is closed An open TCO within a cool chamber would indicate that the assembly must be replaced The TCO is an integral part of the thermocouple and not replaceable as a separate item A pilot burner assembly must be reinstalled On repeated calls of no hot water or pilot outage a clogged dirty LDO screen might be the cause and should be checked Keep in mind this TCO will shut off the pilot and main burner when activated With the different cutoff temperature set points of TCO devices for different model water heaters it is important that the correct part is used when replacement of the pilot burner assembly is necessary Possible service issues associated with the Thermal Cut Off switch being opened e Pilot outage due to increased combustion chamber temperatures below the main burner This may open the automatic reset thermal cut off switch TCO e The flame arrestor having conta
36. s can be toxic though the gas is detectable long before harmful levels are reached The requirements for the bacteria to thrive are a an elevated level of sulfur in the water b activated hydrogen from cathodic reactions within the tank c water with little or no dissolved oxygen d and temperatures below 138 F Items that can increase the potential for these bacteria are a water softeners b well water c and long periods of no water movement Other factors that may contribute to smelly water Chlorides of Magnesium and Calcium leave a bitter taste Chloride of Sodium produces a salty taste Sulfates 50 ppm give a medicinal taste Carbon Dioxide in low pH water gives fizzy water lron and tannic waters also give a bad taste and odor The simplest treatment available is the shock chlorination of the system This is a Surface treatment and often requires repeated trials in heavily infected systems The chlorination of a system requires that you follow each step explicitly to avoid an un treated portion of the piping system from reinfecting another part See Bulletin 23 for the chlorination procedure Longer lasting solutions include chlorination or aeration of the water supply Since smelly water is caused by a bacteria presence and is not caused by the water heater any treatment would not be considered warranty related Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK TECHNICAL B
37. s metal rod offers secondary protection of the tank against corrosion where the application of glass is not possible threaded tank openings These areas will have small areas of water to metal contact All water heaters will contain at least one thermostat to operate the heater and one high limit to prevent water temperatures approaching the steam level State Water Heater 4 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK INSTALLATION OF RESIDENTIAL GAS WATER HEATER Water Exhaust Vent to Shut Off Outside of Building Valve pe P Water Supply Cold Union To s oo Expansion Tank Fixtures f Pressurize to Equal Hot A He Supply Water Pressure See Manual and Labels For Installation Clearances Temperature And i Pressure Relief Typical ii ode Valve Do Not and Rating R Old Val Plate Location CUSE AIVE Gas 4 Temperature and pressure relief valve tube piped to within 6 of drain Maximum Gas Supply 13 8 W C or PSI Minimum Thermostat 4 5 W C Natural Gas recommended starting 11 0 W C Propane Gas point 120 F Safety Pan Piped to Drain a Drain i f Air Is Drawn In For 7 Combustion Keep area clean and free from flammables and Inner and Lo Par flammable vapors Outer Doors Reinstall After Lighting Pilot Inst
38. si when heated just 10 degrees will reach a pressure of 250 psi Many water supply systems have check valves at the water meter to prevent any possible contamination of the public water supply by the accidental back flow of contaminated water into the supply mains These check valves are often required by code and some cities are even installing the check valves They serve a useful purpose Do not remove them The use of pressure reducing valves PRV is another cause PRVs are designed to conserve water and prolong fixture life Many PRVs also act as very effective check valves Again do not remove them Water softeners in the system may also act as back flow preventers Follow these easy steps to diagnose thermal expansion e Turn the heater thermostat all the way down and install a water pressure gauge with dead hand part 4798 on the drain valve Open the drain valve so the gauge reads system pressure Open a hot water tap and allow 15 to 20 of the tanks volume to run out Shut off the drain valve and make sure that no other fixture in the system hot or cold is open Make sure that outside fixtures if they are on the same system are turned off too Any water leaks or use will make the test meaningless Check the water pressure gauge and turn the pointer so it lines up with the pressure indicating needle Turn the thermostat back up to its normal position so the heater cycles on Watch the pressure gauge If the system is
39. t TREATMENT The simplest treatment available is shock chlorination of the system This is a surface treatment and often requires repeated trials in heavily infected systems The chlorination of a system requires that you follow each step explicitly to avoid an un treated portion of the piping system from reinfecting another part See Bulletin 23 for the chlorination procedure Since rusty water is caused by a bacteria presence and is not caused by the water heater any treatment would not be considered warranty related State Water Heater 28 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK TECHNICAL BULLETIN 22 TREATMENT State Water Heater 29 Technical Training Department 2004 SMELLY WATER The most common cause of smelly water is a non toxic sulfate reducing bacteria scientifically termed Divibrio Sulfurcans This bacterium often enters the water system through construction or a break in ground piping The bacteria create the energy it needs to survive by converting sulfate SO to hydrogen sulfide H2S gas you smell in the water Hydrogen sulfide gas is distinctive because of its rotten egg like stench Its presence can severely affect the taste as well as the odor of the water Occasionally these bacteria can be accompanied by black deposits the result of pipe and fitting corrosion In extremely high concentrations hydrogen sulfide ga
40. the inner door 4 Monitor the flame characteristics for several minutes If the flame begins to yellow open a door or window to the outdoors to see if additional air corrects this back to blue If it does the room needs more air supply Perform draft test at draft hood of water heater with match or smoke source to verify a Testing with Gas P Pressure Manifold Gauge Pilot Gas Gas Pressure Pressure Test Test Gas pressure checks are done with flowing gas Supply gas pressure checks are taken ahead of the gas control and as close to the heater as possible Pilot gas pressure checks are taken by using fitting adapters to tap into the pilot gas tubing Manifold main burner gas pressure is measured using the Allen wrench tap on the bottom of the control valve Desired gas pressures will be noted on the gas valve label supply gas pressure is under desired pressure e increase supply gas pressure regulator setting setting and e increase supply gas piping size reduce setting on existing regulator W C from desired W C from desired Additional considerations when pilot or main burner flames are too large or too small e Incorrect orifice e Dirt in orifice or gas supply tubing State Water Heater 11 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK Residential Gas continued Sooting causes the burner is clean but the
41. ughout the recovery cycle The expanded water is flowing back from the heater and into the pressurized storage bladder of the expansion tank Air pressure will force this water out of the expansion tank into the supply once usage resumes DO NOT DEPEND ON THE T amp P VALVE TO HANDLE THERMAL EXPANSION The T amp P valve according to the makers of those valves was designed as an emergency relief device only The T amp P could be subject to reduced effectiveness or failure re C MAINS CHECK VALVE WATER PRESSURE METER REDUCING VALVE 40 60 PSI EXPANSION TANK INSTALL THE PRESSURE REDUCING VALVE AND CHECK VALVE IN THE COLD WATER MAIN TO HOUSE WARNING Thermal expansion of water if not compensated for in system design will lead to the early failure of components These failures are not covered by the manufacturer s warranty so it is extremely important that everyone be aware of the causes symptoms and solutions to thermal expansion in a closed water heating system State Water Heater 33 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK TECHNICAL BULLETIN 52 SYMPTOMS GENERAL THE FIX LEAKING TEMPERATURE AND PRESSURE RELIEF VALVE Water seeping around the relief valve tank connection Leakage at the threaded portion of the relief valve connection Intermittent weeping and or dribbling from the relief valve Large volume of hot water spor
42. y 120 degrees F The heater may shut off at 110 to 130 F The heater will consistently shut off at this same temperature For this same reason water temperature may drop 15 25 F around the temperature probe before the main burner is activated Keep in mind that hot water in the upper part of the tank will probably be very near the shut off temperature of the control while incoming cold water drops the water temperature around the thermostat probe Also short repeating heating cycles caused by small hot water uses can cause temperatures at the point of use to exceed the thermostat setting by up to 30 F Approximate Temperature F Time To Produce 2 amp 3 Degree Burns on Adult Skin Hot a Pp 420 102s 10 5 5Minutes sd __ e a B 140 107 Seconds State Water Heater 9 Technical Training Department 2004 Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK Residential Gas continued Service Air A gas burning appliance requires the oxygen contained in 12 5 cubic feet of air at sea level for every 1000 BTU of heat that is generated If your water heater has a BTU per hour input of 40 000 BTU then a minimum of 500 40 times 12 5 cubic feet of clean air must be available This oxygen will mix with the gas for a clean blue flame in the burner chamber and provide dilution air for flue products Flue Draft Hood Prod ucts Dilution Ai
43. ystem to some degree across the entire United States Since lime is inversely soluble the more you heat the more lime comes out higher usage excessive hardness and increased heating surface can lead to a high incidence of limed up heaters Symptoms often include a popping of water trapped under lime deposits or the sizzling of water trapped next to elements boiling it to steam Treatment of a limed up heater is relatively simple Since CaCO is a base the easiest way to dissolve it so it can be flushed from the heater is with an acid The most commonly used is phosphoric acid at a food grade level Two common treatments available from State are Mag Erad and Un Lime Any well stocked plumbing supply house should have a deliming solution available The directions on the product should be followed explicitly For additional information and instructions in deliming water heaters and boilers please refer to the following pamphlets available from State Why When amp How To Remove Water Scale from Tank Type Water Heaters The Mag Erad Method of Cleaning Gas Fired Water Heaters Up N Down Transfer kit All About Deliming Coil Type Water Heaters Ashland city TN RESIDENTIAL GAS NON POWER VENTED WATER HEATER SERVICE HANDBOOK TECHNICAL BULLETIN 14 ALUMINUM HYDROXIDE SYMPTOMS Crackling gurgling or popping noises from new water heaters installed less than six months In
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