User manual BOSCH GWH 715 ES

GWH 715 ES (GWH 715 CTDR EFS) Temperature Modulated with Electronic Ignition Suitable for heating potable water only - Not approved for space heating purposes (Intended for variable flow applications) GWH 715 ES - Natural Gas GWH 715 ES - Liquefied Petroleum (LP) Gas Warning: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or death. Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier. In the Commonwealth of Massachusetts this product must be installed by a licensed plumber or gas fitter. Upon completion of the installation, these instructions should be handed to the user of the appliance for future reference. What to do if you smell gas · Close gas valve. Open windows. · Do not try to light any appliance. · Do not touch any electrical switch; do not use any phone in your building. · Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions. · If you cannot reach your gas supplier, call the fire department. · Installation and service must be performed by a qualified installer, service agency or the gas supplier. 6 720 608 158 US (2007.01) AL Index Index 1 2 2.1 2.2 2.3 2.4 2.5 Warning Appliance details Features GWH 715 ES Specifications (Technical data) Unpacking the GWH 715 ES heater General rules to follow for safe operation Dimensions and Minimum installation clearances Installation instructions Tools required for installation Introduction Proper location for installing your heater Heater placement and clearances Mounting installation Gas piping & connections Water connections Water quality Recirculation application Combustion air requirements Venting Measuring gas pressure Electrical connections Electrical power supply Position of the fuses in control unit Operation instructions Description LCD display For your safety read before operating your water heater Power Temperature selection Use of optional remote control accessory (part no. TSTAT2) Operation Reset button Program button Locked condition 3 4 4 4 5 6 7 6 6.1 6.2 6.3 6.4 6.5 6.6 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 8 8.1 9 10 11 12 Maintenance and service Annual maintenance Winterizing for seasonal use Mineral scale build-up Adjusting CO2 Program values Control board diagnostics Troubleshooting Introduction Burner do not ignite when hot water is turned ON Water is too hot Water is not hot enough Low water flow/pressure Hot water temperature fluctuates at tap Noisy burner/heater during operation Problem solving Error code diagnostics Electrical diagram Sensor resistance charts GWH 715 ES Functional scheme 29 29 29 30 30 33 34 35 35 35 35 35 36 36 36 38 38 42 43 45 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 4 4.1 4.2 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 8 8 8 8 8 8 10 12 12 13 13 15 24 25 25 25 26 26 27 27 27 28 28 28 28 28 Interior components diagram and parts list 12.1 Interior components 12.2 Components diagram 13 14 Protecting the environment Limited Warranty 46 46 48 54 55 2 6 720 608 158 Warning 1 Warning For your safety Do not store or use gasoline or other flammable, combustible or corrosive vapors and liquids in the vicinity of this or any other appliance. Warning: Carefully plan where you install the heater. Correct combustion air supply and flue pipe installation are very important. If a gas appliance is not installed correctly, fatal accidents can result, such as carbon monoxide monoxide poisoning or fire. Warning: Exhaust gas must be vented to outside using stainless steel vent material suitable for category III vent systems and temperatures up to 480°F. Vent piping must be sealed gas-tight to prevent possibility of flue gas spillage, carbon monoxide emissions and risk of fire, resulting in severe personal injury or death. Approved vent terminators must be used when penetrating to the outside. Warning: Place the heater in a location where water leaks will do NO DAMAGE to adjacent areas or lower floors. Warning: Field wiring connections and electrical grounding must comply with local codes, or in the absence of local codes, with the latest edition of the National Electric Code, ANSI/NFPA 70, or in Canada, all electrical wiring must comply with the local codes and the Canadian Electrical Code, CSA C22.1 Part 1. Warning: Shock hazard: line voltage is present. Before servicing the water heater, unplug power supply cord from outlet. Failure to do so could result in severe personal injury or death. Warning: The heater must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures equal to or more than 0.5 psig. FCC: This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Fig. 1 6 720 608 158 3 Appliance details 2 2.1 Parts Appliance details Features 2.2 GWH 715 ES (Technical data) Specifications · Key Pad interface control · High power pre-mix compact burner with low NOx emissions · Modulating Gas Valve with constant gas:air ratio control · Modulating water valve for improved comfort and temperature control. High quality materials for long working life · Copper heat exchanger · High efficiency Ceramat Burner · Compact space saver: mounts on a wall with a supplied bracket. Features · Real-time diagnostics informational purposes · LCD Display with backlight · On/Off and Temperature control switches · Reset button · Program button (Selectable temperature default) · Failure codes for easy diagnostics and repair · Easily removable one-piece cover. Accessories (Bosch part #) · Optional wireless remote control accessory to operate with the appliance (TSTAT2) · Cascading kit (TLINK) · Outdoor kit (PTOK) · External water filter (8703305356). for troubleshooting/ Approved in US/Canada Capacity Maximum flow rate: 7.3 GPM (27 l/min) at a 45°F (25°C) rise. Maximum output 160,500 Btu/h (47.0 kW) Maximum input 199,000 Btu/h (58.3 kW) Efficiency in % Thermal efficiency > 82% Min. Input 19,900 Btu/h (5.8 kW) Temperature Control Selection range: 100°F (38°C) - 140°F (60°C) Default temperature: 122°F (50°C) Stability: +/- 2°F (+/- 1°C) Gas Requirement Gas connection (inches) - ¾" Inlet gas pressure under operation (with a high hot water flow rate)* · Propane: 9" - 14" water column · Natural Gas: 4" - 14" water column. * To measure gas pressure, see Measuring Gas Pressure, chapter 3.12, page 24. Water · Hot water connection (inches) - ¾" · Cold water connection (inches) - ¾" · Water valve material: Polymer (PPS) (Polypropylene Sulfid) · Minimum water flow: 0.65 gallon/minute (2,5 l/m). Note: Activation varies with inlet water temperatures from 0.65 - 1.6 gallon/minute (2.5 - 6.1 l/m). · Minimum recommended water pressure: 30 PSI (2.07 bar). · Minimum well pressure 40 psi, see page 12. · Connections: ­ Bottom of heater i BOSCH is constantly improving its products, therefore specifications are subject to change without prior notice. 4 6 720 608 158 Appliance details Combustion · NOx 55 ppm · CO 190 ppm · CO2 level set from factory, see chapter 6.4, page 30. Dimensions · Depth (in): 11¼" (286 mm) · Width (in): 17 7/8" (452 mm) · Height (in): 30½" (775 mm) · Weight: 67 pounds (30.5 kg). Gas types Natural Gas. LP Gas. Voltage 120 V AC (60 Hz) nominal Amperage Idle - 40 mA Operation - 2.5 A Noise 45 - 65 db (A) Safety devices · Flame failure device (ionization flame rod sensor) · Pressure relief valve (supplied with heater) · Over heat prevention (temperature limiter) · Inlet temperature sensor · Outlet temperature sensor · Back flow temperature sensor. Water protection IP X4 (protection against water drops) 2.3 Unpacking the GWH 715 ES heater Before installing the unit, be certain you have the correct heater for your type of Gas: Propane or Natural Gas. Identification labels are found on the shipping box, and on the rating plate which is located on the right side panel of the cover. Fig. 2 A B Rating plate Serial number Type of gas The box includes: · GWH 715 ES · Pressure relief valve (150 psi / 200,000 Btu rating) · Bracket for wall hanging the heater · Exhaust vent adaptor (with 4 screws and gasket provided) · Combustion air inlet adaptor (with 3 screws and gasket provided) · Installation manual (manual can be downloaded at www.boschpro.com) · Product registration card · Energy Guide label. Please complete and return the enclosed product registration card. The GWH 715 ES is not approved or designed for: · Manufactured (mobile) homes, boats or any mobile installation. · Use above 4500ft A.S.L. altitude. · Outdoor installation without installation of Outdoor kit (PTOK). · Applications where inlet water temperature is higher than 140ºF (60°C). A 3-way valve or mixing valve must be installed before the appliance if inlet water temperature exceeds this limit. · Space heating purposes. i If appliance is installed at elevations between 2000ft and 4500ft, a combustion gas analyzer is required for proper calibration of appliance. (see page 24). 6 720 608 158 5 Appliance details To remove front cover B Loosen the two Philips head screws located on bottom rear of cover (see Fig. 3). 2.4 General rules to follow for safe operation B 1. You must follow these instructions when you install your heater. In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/ NFPA 54. In Canada: The Installation must conform with CGA B149.(1,2) INSTALLATION CODES and /or local installation codes. B 2. Carefully plan where you install the heater. Correct combustion air supply and vent pipe installation are very important. If not installed correctly, fatal accidents can occur, such as carbon monoxide poisoning or fire. B 3. When the unit is installed indoors and ROOM SEALED (twin pipe) it is permitted to be located in bathrooms, bedrooms and occupied rooms that are normally kept closed. See chapter 3.11 (page 15). If the unit will be installed indoors and use indoor combustion air, the place where you install the heater must have enough ventilation. The National Fuel Gas Code does not allow UNSEALED gas fired water heater installations in bathrooms, bedrooms or any occupied rooms normally kept closed. See chapter 3.3, page 8 and 3.10, page 13. B 4. You must vent your heater. See chapter 3.11, page 15 on VENTING. B 5. The appliance and its gas connection must be leak tested before placing the appliance in operation. The appliance must be isolated from the gas supply piping system by closing its individual manual gas shutoff valve (not supplied with heater) during any pressure testing at pressures in excess of ½ Psig (3.5 kPa). B 6. Keep water heater area clear and free from combustibles and flammable liquids. Do not locate the heater over any material which might burn. B 7. Correct gas pressure is critical for the proper operation of this heater. Gas piping must be sized to provide the required pressure at the maximum output of the heater, while all the other gas appliances are in operation. Check with your local gas supplier, and see the section on connecting the gas supply, see chapter 3.6. B 8. Should overheating occur or the gas supply fail to shut off, turn off the gas supply at the manual gas shut off valve, on the gas line. Note: manual gas shutoff valve is not supplied with the heater but must be field installed. B 9. Do not use this appliance if any part has been underwater. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been underwater. Fig. 3 Loosen the two screws B Lift front cover panel upward and remove. Fig. 4 Remove the front cover To remove combustion cover (service only) B Open the four clips and remove the combustion cover see Fig. 5. Fig. 5 Remove the combustion cover B 10. Failure to install heater correctly may lead to unsafe operation and void the warranty. 6 6 720 608 158 Appliance details 2.5 Dimensions and Minimum installation clearances Fig. 6 1 2 3 4 5 6 7 Dimensions On/Off button Reset button Program key Power ON or stand-by LED LCD display Up button Down button Model GWH 715 ES TOP (A) FRONT (B) BACK SIDES FLOOR (C) VENT DIAMETER VENT CLEARANCES 12" 1" 0" 1" 12" 3" 1" Table 1 Minimum clearances Note: Vent clearances vary per manufacturer. Consult vent manufacturer for specific clearance information. Fig. 7 Minimum clearances Note: For servicing access, a 2ft clearance to front cover is recommended. 6 720 608 158 7 Installation instructions 3 3.1 Installation instructions Tools required for installation Warning: Flammable materials, gasoline, pressurized containers, or any other items or articles that are potential fire hazards must NOT be placed on or adjacent to the heater. The appliance area must be kept free of all combustible materials, gasoline and other flammable vapors and liquids. · Philips head screwdriver · Flat head screwdriver · Adjustable wrench · Level · Thermometer · Standard plumbing tools · Manometer. 3.4 Heater placement and clearances 3.2 Introduction Please follow these instructions. Failure to follow instructions may result in: B Damage or injury. B Improper operation. B Loss of warranty. If you are unable to perform the tasks required to install this heater properly, please contact a locally licensed plumber or gas technician. The GWH 715 ES is approved for installation on a combustible wall (see chapter 3.5 Mounting installation) provided the floor covering below the heater is noncombustible. For installations in an alcove or closet, maintain the minimum clearances to combustible and non-combustible materials listed below. See also Fig. 7. A. Top 12 inches (306 mm) B. Front 1 inches (25 mm) C. Back 0 inches D. Sides 1 inches (25 mm) E. Bottom 12 inches (306 mm) Clearances from any exhaust vent pipe are dependent upon the clearance requirements of the stainless steel vent pipe manufacturer. Single wall stainless steel (AL29-4C) vent pipe (vent type rated for Category III appliances) must be used when exhaust venting this appliance. See chapter 3.11 (page 15) Venting. 3.3 Proper location for installing your heater Carefully select the location of the water heater. For your safety and for proper heater operation, you must provide combustion air to the heater and a proper exhaust vent system. Follow the guidelines below: B 1. Locate the heater where venting, gas and plumbing connections are feasible and convenient. B 2. The hot water lines should be kept short and insulated to save energy. Centrally locating the water heater is recommended to keep hot water distribution times even throughout the structure. Warning: The water in this water heater is cold and always remains cold except for the times the burner is on. In the event of power outage in conjunction with freezing temperatures, it is recommended that the heater be drained. See chapter 6.2, page 29 "Winterizing" for draining instructions. 3.5 Mounting installation Warning: before starting installation B Check that there are no loose parts inside the appliance B Confirm the gas type of the heater matches the gas supply you will be connecting the heater, see Fig. 2, page 5. B Ensure that gas pipe, gas valve, mixer, fans and burner have no damage and are properly fitted. Front cover should be removed (see instructions on page 6) in order to inspect components visually. Warning: Do not install this appliance on a carpeted wall. The heater must be mounted on a wall using appropriate anchoring materials. i 8 6 720 608 158 Installation instructions If wall is sheathed with plaster or drywall, it is recommended that two support boards, either 1"x4" or 1/2" (minimum) plywood first be attached across a pair of studs, see Fig. 8, page 9. B Secure the wall mounting bracket provided with the heater to the wall surface. The heater must be kept level on the wall surface, see Fig. 9, page 9. B Hang the appliance on the bracket, see Fig. 10, page 9. Studs 16" (406mm) on center Fig. 10 Mounting the heater Warning: Appliance must be installed vertically. Fig. 8 Distance between support boards Fig. 9 Leveling the mounting bracket on the studs 6 720 608 158 9 Installation instructions 3.6 Gas piping & connections Before connecting the gas supply, check the rating plate on the right side of the heater to be sure that the heater is rated for the same gas to which it will be connected. In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54. In Canada: The Installation must conform to CSA B149 INSTALLATION CODES and/or local installation codes. Warning: DO NOT connect to an unregulated or high pressure propane line or to a high pressure commercial natural gas line. Warning: The heater must be isolated from the gas supply piping system during any pressure testing of that system at test pressures equal to or more than 0.5 psig. If overpressure has occurred, such as through improper testing of the gas lines or malfunction of the supply system, the gas valve must be checked for safe operation. GAS CONNECTIONS B Install a manual gas shut off valve on the gas supply line. B Install a union when connecting gas supply. B The minimum internal diameter required for any appliance connector is ¾", see Fig. 13 for more details on pipe sizing. B National Fuel Gas Code requires that a sediment trap (drip leg) be installed on gas appliances not so equipped. The drip leg must be accessible and not subject to freezing conditions. Install in accordance with the recommendations of the serving gas supplier, see Fig. 11. Once connections are made, check for gas leaks at all joints. Apply some gas leak detection solution to all gas fittings. Bubbles are a sign of a leak. A combustible gas detector may also be used to detect for leaks. Danger: If you have a leak, shut off the gas. Tighten appropriate fittings to stop leak. Turn the gas on and check again with a gas leak detection solution. Never test for gas leaks using a match or flame. GAS LINE SIZING The gas supply piping for a single heater should be sized for a maximum draw of 199,000 BTUH. Measure the length of gas supply line and use the tables in Fig. 13, page 11 or the gas line manufacturer's sizing tables to determine the pipe diameter necessary to accommodate the 199,000 BTU demand of the heater. If there are more gas appliances on the line, size the gas line according to the total maximum amount of BTU input rating for all appliances. Note: Undersizing the gas line may result in diminished hot water flow rate and temperature. See chapter 3.12, page 24 for the procedure to confirm gas pressure. Proper gas pressure must be confirmed at time of installation. Gas piping Inlet gas particle screen (included) Fig. 12 Minimum 3" Gas supply Cap Fig. 11 Gas connection (drip leg) 10 6 720 608 158 Installation instructions FOR NATURAL GAS Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3" in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands. Follow boxed numbers for piping just one GWH 715 ES (example: ¾" B.I. Natural Gas pipe for 10 ft (3.0m). will handle 278,000 btu's (81.5 kWh). For multiple appliances combine the total maximum btu input load and then refer to applicable chart below. Nominal Iron Pipe Size, inches 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 Internal Diameter inches 0.364 0.493 0.622 0.824 1.049 1.380 1.610 2.067 10 32 72 132 278 520 1050 1600 3050 20 22 49 92 190 350 730 1100 2100 30 18 40 73 152 285 590 890 1650 40 15 34 63 130 245 500 760 1450 50 14 30 56 115 215 440 670 60 12 27 50 105 195 400 610 70 11 25 46 96 180 370 560 80 11 23 43 90 170 350 530 990 90 10 22 40 84 160 320 490 930 100 9 21 38 79 150 305 460 870 125 8 18 34 72 130 275 410 780 150 8 17 31 64 120 250 380 710 175 7 15 28 59 110 225 350 650 200 6 14 26 55 100 210 320 610 Length of Black iron Pipe , Feet 1270 1150 1050 Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet Tube size, inches EHD* 10 20 58 116 231 456 30 47 96 188 374 40 41 83 162 325 50 37 75 144 292 60 34 68 131 267 1/2 3/4 1 1 1/4 18 EHD 82 23 EHD 161 30 EHD 330 37 EHD 639 * EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing. FOR LP GAS Maximum Capacity of Pipe in Thousands of BTU per Hour of Undiluted Petroleum Gases (at 11 inches Water Column Inlet Pressure) (Based on a Pressure Drop of 0.5 Inch Water Column). * EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing. Lengt h of Flexible Corrugat ed St ainless St eel Tubing (CSST), F Nominal iron pipe Inches Black Iron Pipe Length of Pipe, Feet 10 1/2 3/4 1 291 608 20 200 418 30 160 336 632 40 137 287 541 50 122 255 480 60 110 231 434 80 94 197 372 100 84 175 330 125 74 155 292 150 67 140 265 200 58 120 227 Tube size inches EHD* 10 20 91 183 365 30 74 151 297 40 64 131 256 50 58 118 227 1/2 3/4 1 18 EHD 129 23 EHD 254 30 EHD 521 1145 787 Maximum Capacity of Semi-Rigid (flexible, non Outside diameter Inch 3/8 1/2 5/8 3/4 10 39 92 20 26 62 30 21 50 corrugated) Tubing in Thousands of BTU per Hour of Undiluted Liquefied Petroleum Gases (at 11 inches Water Column Inlet Pressure). (Based on a Pressure Drop of 0.5 Inch Water Column) * Source National Fuel Gas Code NFPA 54, ANSI Z223.1 - No Additional Allowance is necessary for an ordinary number of fittings Copper Length of Tubing, Feet 40 19 41 90 50 _ 37 79 131 60 _ 35 72 70 _ 31 67 80 _ 29 62 90 100 _ 27 59 95 _ 26 55 90 199 131 329 216 107 181 145 121 112 104 Fig. 13 6 720 608 158 11 Installation instructions 3.7 Water connections Warning: This heater is not approved for preheated water applications above 140°F (60°C). See chapter 3.9 for approved recirculating application. B Never sweat any piping directly to or beneath the water connections, as damage can occur to the internal water valve from heating of the pipe. B Keep water inlet and outlet pipes to no less than ¾" (19.05mm) diameter to allow the full flow capacity. B If the cold and hot connections to the heater are reversed, the heater will not function. Be certain there are no loose particles or dirt in the piping. Blow out or flush the lines before connecting to the water heater. B Full port shutoff valves should be installed on both the cold water supply and hot water outlet lines to facilitate servicing the heater (see Fig. 16). B For installation on a private well system with the use of a pressure tank, the lowest pressure range setting recommended is 40-60 psi (2.75 and 4.15 bar). B When facing the heater, the ¾" cold connection is on the bottom right and the hot connection is on the bottom left. Centrally locating the water heater is recommended to keep hot water distribution times even throughout the structure. 3.8 COLD HOT Water quality Fig. 14 Water quality can have an impact on appliance longevity and may not be covered under the manufacturer's warranty. For water analysis data call your local water department, or if on a well, have well water analyzed periodically. If water quality exceeds one or more of the values specified below, Bosch recommends installing a water conditioner or softener. Description pH TDS (total Dissolved Solids) Total hardness Aluminum Max. Levels pH mg/l or ppm mg/l or ppm mg/l or ppm mg/l or ppm mg/l or ppm mg/l or ppm mg/l or ppm mg/l or ppm 6.5 - 8.5 500 100 (6 grains) 2.0 250 1.0 0.3 0.05 5.0 Fig. 15 Water filter 1 2 Water valve with engine Water filter Chlorides Copper Iron Manganese Zinc Table 2 B The use of unions when connecting both water pipes to the inlet and outlet connections is required. This will facilitate any necessary servicing. B Plastic or PEX type plumbing line materials are not suitable for connecting directly to the water heater. B Although water piping throughout the building may be other than copper, we recommend that copper or suitably rated stainless steel flex line piping be used for the water connections for 1.5' on either side of the water heater (follow local codes if more stringent). 12 6 720 608 158 Installation instructions Connecting the pressure relief valve (PRV) A listed pressure relief valve supplied with the heater must be installed at the time of installation. No valve is to be placed between the PRV and the heater. No reducing coupling or other restriction may be installed in the discharge line. The discharge line must be a minimum of 4" above a drain and installed such that it allows complete drainage of both the PRV and the line. The discharge line must be placed where it will not cause any damage. The location of the PRV must be readily accessible for servicing or replacement, and be mounted as close to the water heater as possible. See Fig. 16. To install the PRV, a suitable fitting connected to an extension on a "T" fitting can be sweated to the hot water line. Support all piping. 3.9 Recirculation application The GWH 715 ES Protankless water heater is approved for domestic hot water recirculation. The following drawing is provided to outline one possible recirculation design using the water heater in conjunction with an Ariston mini tank water heater. Recirculation directly through the tankless water heater is also allowed. This schematic is for illustration only and must not be used for actual installation without appropriate engineering and technical advice from a properly licensed professional in the locality where the installation is made. GWH 715 ES Ariston Minitank Fig. 17 Recirculation application 1 2 3 4 5 Full port isolation valve Circulator (pump on timer) Check valve PRV Expansion tank Fig. 16 Plumbing Connections (with shutoff valves) and Pressure Relief Valve Warning: In applications where inlet water temperature can exceed 140°F (60ºC), a 3-way valve or mixing valve must be installed before the appliance to prevent water exceeding 140°F (60°C) from entering the appliance. The use of a small electric mini-tank water heater (4-6 gallon size) should be used for this application and designed so the pump will circulate the water through the mini-tank and the building's hot water return loop only. Timed or thermostatically controlled operation of the pump is commonly done. Contact Bosch Water Heating if further information is needed. 3.10 Combustion air requirements Warning: In areas where outside temperatures commonly fall below 36°F, a twin pipe venting system is required. Failure to do so may result in cold outside air being drawn in through the venting system due to a negative pressure in the house and across the heat exchanger coil causing it to freeze and burst. This failure is not covered under the manufacturer's warranty. 6 720 608 158 13 Installation instructions Warning: When installed in an environment where corrosive chemicals or dirty air are present the twin pipe system is required. Twin pipe The GWH 715 ES is designed as a sealed combustion appliance. It is recommended that the combustion air be provided by a dedicated 3" or 4" pipe from the outside. The combustion air pipe may be PVC or any other rigid or semi rigid sealed 3" or 4" pipe. The combustion air inlet, whether terminating vertically or horizontally, must be located in such a manner as to provide a minimum 3 foot clearance from the exhaust vent terminator. See Fig. 28 Letter I, page 21. The maximum length of the combustion air inlet is 26 feet with one elbow. Subtract 2.5 feet for each additional 90° elbow and 1.25 feet for each additional 45° elbow. Maximum number of elbows permitted is 3. Warning: Terminations must prevent rain and debris from entering the combustion air and exhaust vent piping. Single pipe Note: This appliance requires 9950 cubic feet of available combustion air, or a minimum of 1243 square feet of space with an 8 foot ceiling to operate. If the large amount of air space, which equates to about half of most average sized homes, is not available, the appliance must pull air from the outside (see twin pipe above). Although it is permissible to draw combustion air from inside the structure, it is not the manufacturer's recommended installation method. Always install a 3 inch elbow on the top of the combustion air inlet adaptor to prevent foreign objects from falling into the unit. If a single pipe installation is utilized, follow guidelines below for providing adequate combustion air for the water heater as well as any other appliances that may consume air in the space. Always follow local codes if they are more stringent. This Installation Manual specifies the minimum vertical vent pipe and the amount of combustion air required for this unit. When all requirements are followed, the unit will operate properly and safely. However, there may still be a risk of freezing due to negative draft if the other combustion appliances in the building are not supplied with sufficient combustion air. A wood stove or furnace can pull its combustion air from the heater's vent pipe, allowing the cold incoming air to freeze the cold water in the heat exchanger. Supplying more combustion air for all combustion appliances is the solution. A HVAC specialist should be consulted to design solutions for providing more combustion air. Observe the following guidelines: Installations in structures that have been tightly constructed (air infiltration rate of 0.40 ACH or less) must be provided with combustion air per the National Fuel Gas Code. Consult a HVAC specialist if your air infiltration rate is questionable. The space must have two permanent openings, one commencing within 12 inches of the top and one commencing within 12 inches of the bottom of the enclosure. Each opening must have a minimum free area of one square inch per: · 1000Btu/hr if all air is taken from inside the building · 2000Btu/hr if all air is taken from the outside by horizontal ducts · 4000Btu/hr if all air is taken from the outside by direct openings or vertical ducts. Or the space must be provided with one permanent opening or duct that is within 12 inches of the ceiling of the enclosure. This opening must have a minimum free area of one square inch per: · 3000Btu/hr if all air is taken from the outside by a direct opening or vertical duct. 14 6 720 608 158 Installation instructions 3.11 Venting Warning: Do not reduce the vent (exhaust and combustion) pipe sizes and do not common vent with any other vented appliance or stove. Warning: Failure to vent the exhaust gases to the outside with sealed stainless steel vent pipe (AL29-4C) may result in dangerous flue gases filling the structure in which it is installed. Warning: Do not mix vent pipe or joining methods from different manufacturers. Warning: Proper end terminal / rain cap must be used. Failure to do so may result in damage to the appliance. This damage is not covered under the manufacturer's warranty. Caution: The vent system must be installed by a qualified installer in accordance with these instructions. If improperly installed, a hazardous condition such as explosion or carbon monoxide poisoning could result. Bosch Water Heating will not be responsible for improperly installed appliances. 3.11.1 Vent material and specifications Establish vent clearances that comply with the vent manufacturer's specifications. In all cases, follow local codes. See Table 3. Diam. Min. lenght 3 feet Max. length Material The appliance should be located as close to the point of vent termination as possible. The maximum vent length is 26 feet (8 m) with one 90 degree elbow and approved terminator. Subtract 2.5 feet from the total vent length for each additional 90° elbow used (a maximum of three 90° elbows are permitted in the total vent length), or subtract 1.25 feet for every 45° elbow used. Horizontal sections of vent must pitch upwards towards termination ¼" for every foot of horizontal length, to prevent the pooling of condensate, and be supported at 4 foot intervals with overhead hangers. Exception: horizontal run between last elbow and termination must pitch down to termination 1/4" per foot. Note: For horizontal terminations, venting must terminate once it penetrates to the outside of the structure. There must be no sections of vent pipe exposed to the outdoors other than the termination. Note: Listed thimbles or collars are necessary where venting passes through wall and ceiling partitions. If the vent system passes through combustible areas where the vent clearance requirements cannot be maintained, it is permissible to chase straight sections of sealed 3 inch single wall vent through 4 inch (or greater) Type-B vent. The distance to combustibles using this chase technique is 1 inch1). Note: Type-B vent must never be used as the actual exhaust vent system for the appliance, as it is not gas tight and illegal for use with this appliance. This will create a serious health hazard and void the warranty. 3" VENTING 3" Horizontal Terminal 3" Vertical terminator Z flex Protech Heat Fab 2SVSTB03 FSTB3 9390 TEE 2SVSRCF03 FSRC3 5300CI Table 4 Terminator Part Numbers Fittings or Piping Equivalent feet 45 degree elbow 90 degree elbow pipe per foot 1.25 2.5 1 m 0.38 0.76 0.30 Exhaust 3 or 4 Vent inches 26 feet with Sealed single wall 1 90° elbow stainless steel and terminal (AL29-4C) 26 feet with Sealed PVC or 1 90°elbow any other rigid or and terminal semi rigid pipe Intake Vent 3 or 4 inches 1 90° elbow Table 3 Venting Specifications Table 5 Friction Loss Equivalent in piping and fittings For specific questions concerning vent material, specifications, usage or installation, please contact the vent manufacturer directly. i Note: Maximum combination length for separate (twin) tubes: · 52 ft + two 90° elbows + two terminals. 1) in all cases, follow local codes. 6 720 608 158 15 Installation instructions Company Z-flex ProTech Industries Heat-Fab Contact info www.z-flex.com 800-654-5600 www.protechinfo.com 800-766-3473 www.heatfab.com 800-772-0739 page 35. See error code to confirm error, correct the problem and then reset the heater before operating. 3.11.2 Vent connections B Attach the flue gas exhaust accessory (8 705 504 151) to the top of the unit (position 1) using the 4 screws and gasket provided. Fully insert stainless steel vent pipe 1.5" minimum into the accessory and tighten the clamp (position 2). Table 6 Vent manufacturers Minimum exhaust vent size and length The minimum exhaust vent length is 3 feet (1 m) with one 90 degree elbow. Fig. 18 Maximum exhaust vent and combustion air inlet lengths Fig. 20 B Attach the combustion air inlet accessory (8 705 504 154) to the top of the unit (position 3) using the 3 screws and gasket provided, and install air intake pipe over the accessory. NOTE: The appliance has the option to mount the combustion air inlet accessory on the top right or on the top left side of the heater. The combustion air inlet that is not used must be kept sealed. Fig. 19 Maximum vent and combustion air lenghts Note: reduce 2.5 ft for each 90° elbow used after the first one, reduce 1.25 ft for each 45° elbow, see table 3, page 15. Refer to chapter 3.11.3 requirements. for condensate drain Fig. 21 B Ensure that exhaust vent pipe is fully inserted in collar to enable proper connection. i Note: Maximum combination length for separate tubes: · 52 ft + two 90° elbows + two terminals. Vent Safety System The GWH 715 ES will shut down if inadequate exhaust venting is detected or a lack of combustion air is provided to the unit; see troubleshooting section on i Exhaust venting must be 3" or 4" sealed single wall stainless steel (AL29-4C) vent pipe. 16 6 720 608 158 Installation instructions 3.11.3 Condensate drain requirements A condensate drain must be installed under the following conditions: · All vertical terminating vent installations · Horizontal terminating vent installations where the total vent length is greater than 10 feet · Vent installations where any section of the exhaust vent pipe passes through an unconditioned space. Note: Do not install condensate drain in areas where it may freeze. 1. Install condensate drain as close to heater as possible. 2. Use 3/8" ID high temperature silicone tube to connect to condensate drain port. Do not use copper piping for any portion of the condensate drain. 3. Form a condensate trap by means of a 3" loop partially filled with water. 4. To increase the tube length, connect to end of the high temperature silicon tubing with vinyl tubing, PVC or CPVC pipe. Do not reduce the internal diameter at any point. 5. Dispose of condensate according to local codes. Room sealed installation (TWIN PIPE SYSTEM) Installing this water heater as a room sealed (TWIN PIPE SYSTEM) is the recommended method. Contact your dealer for available vent termination kits and vent materials for this water heater. The exhaust and combustion air piping must vent directly to the outside of the structure. Warning: In areas where outside temperatures commonly fall below 36°F, a twin pipe venting system is required. Failure to do so may result in cold outside air being drawn across the heat exchanger coil causing it to freeze and burst. This failure is not covered under the manufacturer's warranty. Fig. 23 Combustion air pipe: 26 ft (8 m) from collar Exhaust vent pipe: 26 ft (8 m) from collar Fig. 22 Condensate drain installation 3" Venting 90° Condensate Drain Tee Horizontal Condensate Drain Condensate Drain Tube Z-flex 2SVEVWCF03 ProTech FST3 & FSDF3 FSHDT3 Heat Fab 93PPLSTEE 2SVEDWCF03 9321 Fig. 24 2SVEDTK24 N/A 7000TUBE Table 7 Approved Condensate Drain Part Numbers 6 720 608 158 17 Installation instructions Warning: Approved terminators must be used for inlet and exhaust vent systems to prevent rain from entering the appliance, failure to do so may result in damage to the appliance. This failure is not covered under the manufacturer's warranty. The exhaust vent system must vent directly to the outside of the building and an adequate amount of indoor combustion air must be provided for this installation. See chapter 3.10. Note: reduce 2.5 ft for each 90° elbow used after the first one, reduce 1.25 ft for each 45° elbow. A maximum of three 90-degree elbows are permitted. Fig. 25 Open combustion installation (SINGLE PIPE SYSTEM) Not recommended in cold climate areas, see chapter 3.10, page 13. Fig. 26 Connecting a one piece 90 degree elbow pipe to the combustion air inlet adaptor is necessary. This will prevent debris or objects from falling into the appliance. 18 6 720 608 158 Installation instructions 3.11.4 Vent length calculation Adjusting the minimum power (P2) based on the total combined vent length. After installing the GWH 715 ES, the minimum power fan speed must be selected to compensate for variation in vent pipe length. Total vent length calculation B Determine the total length of all straight sections of vent pipe and enter in table 8, line 1. B Count the number of 90° elbows used and enter that value in line 2. (Do not count end terminal and first elbow after the appliance). B Count the number of 45° elbows used and enter that value in line 3. B Repeat steps 1 through 3 for air intake pipe and enter those values in the intake section of table 8. B Add line 4 from Exhaust to line 4 of Intake and enter result in line 5. This is the total equivalent vent length. NOTE: If total equivalent vent length calculated is 19 feet or less, no P2 adjustment is needed. Exhaust 1 2 3 4 Example Exhaust Straight section length 90° elbows (qty) 45° elbows (qty) 22 = 1 x 2.5 = 0 x 1.25 = Total: Intake Straight section length 90° elbows (qty) 45° elbows (qty) 15 = 1 x 2.5 = 0 x 1.25 = Total: Total equivalent vent length = 15 2.5 0 17.5 42 22 2.5 0 24.5 Table 9 Determining vent length combination example __ = __ x 2.5 = __ x 1.25 = Total: ____ ____ ____ ____ Straight section length 90° elbows (qty) 45° elbows (qty) i Total maximum length not to exceed 52 ft. Intake 1 2 3 4 5 Straight section length 90° elbows (qty) 45° elbows (qty) __ = __ x 2.5 = __ x 1.25 = Total: ____ ____ ____ ____ ____ Total equivalent vent length = Table 8 Determining vent length combination (see example in Table 9) Example Exhaust · 7 - 3' straight sections · 1 - 1' straight section Total length 22' · 1 - 90° elbow. Intake · 5 - 3' straight sections Total length 15' · 1 - 90° elbows. 6 720 608 158 19 Installation instructions To select fan speed: B Press ON/OFF button into OFF. B Press and hold "Program" button and press ON/OFF button to turn appliance ON. Fig. 27 B As soon as '188' is displayed, release "Program" button , and the display should read P2. B Press or to choose the fan speed suitable with your installation, see Table 10. B Press and hold (± 5 sec.) "Program" button until the display flashes, then the selected value is memorized. Mode "P2" Pipe Length1) 3 - 19 ft 20 - 46 ft 47 - 52 ft Table 10Fan speed adjustment 1) Full equivalent length (inlet + outlet piping + fittings) Fan speed pick 6 pick 7 pick 8 i Do not set P2 to greater then 8. 20 6 720 608 158 Installation instructions Recommended exhaust vent terminator position Fig. 28 Ref. A Description Directly below an opening; operable windows, doors and any nonmechanical fresh air openings Below a gutter, sanitary pipework or eaves Minimum distance 36 in (twin pipe installation) 48 in (single pipe installation) 24 in 12 in 12 in 12 in 7 ft 24 in 60 in 48 in 60 in B Below a gutter, sanitary pipework or eaves, protected by metal shielding From any internal corner Above ground or snow pack Above a paved sidewalk C D* E F G From an opposing wall or structure facing the termination From the relief valve of a Ip gas regulator From a terminator facing a terminator Vertically between two exhaust vent terminators on the same wall H Horizontally between two exhaust vent terminators on the same wall Horizontally and vertically from combustion air inlet of a twin pipe system From the gravity combustion air inlet any other equipment 36 in 36 in 6 ft 12 in 12 in (twin pipe installation) 48 in (single pipe installation) see ABOVE THE ROOF requirements on following page I** J K From any external corner Horizontally from an opening; operable windows, doors and any nonmechanical fresh air openings Vertically from a wall, roof slope, or obstruction (venting through a flat or pitched roof) L Table 11 * Subject to local codes and anticipated snow level ** Other equipment that operates with a mechanical air inlet may require greater distances, reference manufacturer's instructions NOTE: terminating exhaust vent under a deck is not permitted 6 720 608 158 21 Installation instructions Venting configuration examples Fig. 31 Above the roof clearance requirements from rain cap (combustion air piping not shown) Fig. 29 Horizontal side wall venting installation (combustion air piping not shown) Important: Note: Pitch horizontal sections down to the heater. Exception: horizontal run between last elbow and termination must pitch down to termination 1/4" per foot. Note: For horizontal terminations, venting must terminate once it penetrates to the outside of the structure. There must be no sections of vent pipe exposed to the outdoors. Fig. 32 Vertical venting installation - Masonry Chimney (combustion air piping not shown) Fig. 30 Vertical venting installation (combustion air piping not shown) 22 6 720 608 158 Installation instructions Attention residents of the Commonwealth of Massachusetts: In the Commonwealth of Massachusetts the following regulation went into effect on 12/30/2005: (a)For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied: 1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of the side wall horizontal vented gas fueled equipment, the installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector with an alarm and battery back-up is installed on the floor level where the gas equipment is to be installed. In addition, the installing plumber or gasfitter shall observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building or structure served by the side wall horizontal vented gas fueled equipment. It shall be the responsibility of the property owner to secure the services of qualified licensed professionals for the installation of hard wired carbon monoxide detectors. a.In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an at tic, the hard wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent floor level. b. In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner shall have a period of thirty (30) days to comply with the above requirements; provided, however, that during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm shall be installed. 2.APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified. 3. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print size no less than one half (1/2) inch in size, "GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS". 4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5.08(2)(a)1 through 4. (b)EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4: 1. The equipment listed in Chapter 10 entitled "Equipment Not Required To Be Vented" in the most current edition of NFPA 54 as adopted by the Board; and 2. Product approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from the dwelling, building or structure used in whole or in part for residential purposes. (c) MANUFACTURERS REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM REQUIRED. When the manufacturer of Product Approved side wall horizontally mounted gas equipment provides a venting system design or venting system components with the equipment, the instructions provided by the manufacturer for the installation of the equipment and the venting shall include: 1. Detailed instructions for the installation of the venting system or the venting system components: and 2. A complete parts list for the venting system design or venting system. (d)MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED. When the manufacturer of a product approved side wall horizontally vented gas fueled equipment does not provide the parts for the venting of flue gases, but identifies "special venting systems," the following requirements shall be satisfied by the manufacturer: 1. The referenced "special venting system" instructions shall be included with the appliance or equipment installation instructions; and 2. The "special venting systems" shall be product approved by the Board, and the instructions for that system shall include a parts list and detailed installation instructions. (e) A copy of all installation instructions for all products approved side wall horizontally vented gas fueled equipment, all venting instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the appliance or equipment at the completion of the installation. 6 720 608 158 23 Installation instructions 3.12 Measuring gas pressure Confirm gas pressure upon installation. Connecting manometer B Shut off gas supply at installer supplied shutoff valve for this water heater. B Remove front cover and locate inlet gas pressure measuring point (see Fig. 34). B Loosen screw inside left test point fitting (do not remove) and connect manometer tube to test point. Remove screw completely if correct size tapping is available. Static Pressure Test B Turn gas supply back on. B Record static gas pressure reading in table 13. Operating Pressure Test B Press ON/OFF button to turn off the appliance. B Press and hold "Program" (P) button and press ON/ OFF button to turn appliance ON. B Record lowest operating gas pressure reading in table 13. Gas pressures lower than 4" W.C. for Natural Gas or 9" W.C. for LPG will result in insufficient degree rise to the hot water being used, reduced hot water volume, possible error code faults and must be corrected. See Gas Connections, chapter 3.6, page 10. P1 fan speed: Factory default: NG: 45, LP: 44 Lowering P1 fan speed reduces the maximum BTU input. As a temporary measure if the gas pressure in P1 is below specification, lower P1 fan speed incrementally until minimum inlet gas pressure reaches specified range (table 12). After upgrading gas line, reset appliance to P1 factory default setting (NG: 45, LP: 44). Fig. 34 Gas pressure test port (left tapping) Static Gas Pressure Reading (see Chapter 3.12) Fig. 33 B As soon as '188' is displayed, release "Program" , button and the display should read P2. B Press or until P1 appears. Note: While in this mode the appliance will run constantly at maximum power and allow maximum water flow. For inlet gas pressure adjustment consider the following table: Gas type pin Table 12 enter here: ___________________ Date: ___________ Operating Gas Pressure Reading (see Chapter 3.12) enter here: ___________________ Date: ___________ Table 13 HIGH ALTITUDE OPERATION (see chapter 6.4 page 30, for details) Altitude above sea level Natural Gas: Liquid Propane: For operation at elevations above 2,000 ft (610 m) the equipment ratings shall be reduced at the rate of 4% for each 1,000 ft (305 m) above sea level NG 4" WC LPG 9" WC 0 - 2,000 ft (0 - 610 m) no modification no modification Minimum inlet gas pressure under full operation 2,000 ft - 4,500 ft (610 m - 1,372 m) CO2 adjustment with flue gas analyzer required See section 6.4 for instructions. B Turn on high volume of hot water flow (at least 6 gpm) and heater will ignite. If heater display reverts to P2, open more hot water fixtures to allow sufficient flow. Press until P1 reappears on display. B Operate all other gas appliances (except this heater) on same gas piping system at maximum output. Above 4,500 ft (above 1,372 m) Not approved Table 14 24 6 720 608 158 Electrical connections 4 4.1 Electrical connections Electrical power supply Warning: For safety reasons, disconnect the power supply cord to the heater before any service or testing is performed. Warning: This heater must be electrically grounded in accordance with the most recent edition of the National Electrical Code. NFPA 70. In Canada, all electrical wiring to the heater should be in accordance with local codes and the Canadian Electrical Code, CSA C22.1 Part 1. Do not rely on the gas or water piping to ground the metal parts of the heater. 4.2 Position of the fuses in control unit To check fuses, proceed as follows: B Remove the front cover, see Fig. 4, page 6. B Remove the three screws on front of the control unit. Fig. 35 B Pull control unit free to access and remove the six screws from the back cover of the control unit, see Fig. 36, pos. 2. B Check the fuses in the printed circuit board, see Fig. 36, pos. 3. The GWH 715 ES requires an electrical power supply from a 120VAC / 60Hz circuit (with a dedicated outlet) and must be properly grounded. A means for switching off the 120VAC power supply must be provided. The heater is wired as shown in the wiring diagram (chapter 9, Fig. 59). Fig. 36 Location of fuses B After verifying the fuses mount all parts in reverse order. 6 720 608 158 25 Operation instructions 5 Operation instructions Fig. 37 1 2 3 4 5 6 7 On/Off button Reset button Program Key LCD display Up button Down button LED - Power On indicator or Stand-by 5.1 Description LCD display Warning: Do not use any cleaning or corrosive agent to clean the window. Fig. 41 Lock indicator (only with remote control) Fig. 42 Flame indicator Fig. 38 Power bar indicator (input) Fig. 43 Solar mode indicator (see chapter 5.4, page 27) Fig. 39 Temperature indicator Fig. 44 Remote control indicator Fig. 40 Error indicator 26 6 720 608 158 Operation instructions 5.2 For your safety read before operating your water heater Warning: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. 5.4 Temperature selection or in order to reach desired To select output water temperature: B Press buttons temperature. A. This appliance is equipped with electronic ignition for lighting the main burner. When turning the heater on, follow these instructions exactly. B. Before operating the unit, press the On/Off button. WHAT TO DO IF YOU SMELL GAS B Do not try to light any appliance. B Do not touch any electric switch; do not use any phone in your building. B Immediately call your gas supplier from a neighbors phone. Follow the gas supplier's instructions. B If you cannot reach your gas supplier, call the fire department. C. Use only your hand to press the on/off control switch. Never use tools. Follow these instructions exactly. If control switch is jammed, close the gas supply and call a qualified service technician. Attempted forceful repair may result in a fire or explosion. D. Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water. Fig. 46 Setting the water temperature The desired temperature of the hot water can be adjusted on the front control panel of the heater. The GWH 715 ES has an electronically controlled gas valve that modulates the burner input in response to both varying hot water flow rates and/or changes in any incoming and outgoing water temperatures. Note: The water heater, running at minimum BTU, may still achieve temperatures above the desired set temperature. Low flowing fixtures are the leading cause of this type of temperature overshoot. To combat this symptom, clean fixtures or replace with higher flowing ones. Solar mode The water heater will not ignite if inlet water temperature exceeds the set temperature on the appliance. In this condition, the solar mode indicator will show on the LCD display. See Fig. 43, page 26. 5.3 On Power B To start the appliance press the On/Off button. Fig. 45 Off B To shut down the appliance press the On/Off button again. Fig. 47 6 720 608 158 27 Operation instructions 5.5 Use of optional remote control accessory (part no. TSTAT2) Fig. 51 Reset button If the problem persists, contact your installer. 5.8 Fig. 48 Remote control The wireless remote control accessory (Fig. 71, component 13) and the temperature selector buttons on the front of the water heater operate identically. Contact your distributor to order the remote control accessory. Modification of the water heaters interior control unit (Fig. 71, component 16) is required when programming the remote control with this heater. Program button Program button can be used on the appliance and in the remote control. Programming "Program" function Programming actions are similar for both controls (appliance control pad and wireless remote control). i 5.6 NOTE: up to 6 remote controls can be programmed for one single water heater, each with a range distance of 98 ft (30 m). Operation Fig. 52 "Program" key Memorizing selected temperature B Press buttons memorized. or to select temperature to be B When a hot water tap is opened, main burner ignites and LCD displays the symbol . B Hold "Program" button for 3 seconds to save temperature. When LCD stops blinking, temperature is saved in memory. Fig. 49 B LCD blinks until selected temperature is reached. Using "Program" function In order to select memorized temperature B Press "Program" key. LCD shows pre-memorized temperature, which is now the hot water selected temperature. 5.7 Reset button If the LCD shows the error symbol do not shut off power or unplug the heater. See the error code on LCD and consult "Troubleshooting" section. 5.9 Locked condition This condition is only valid for appliances with one or more remote controls installed. Fig. 50 After following instructions "Troubleshooting" section. indicated in Fig. 53 Locked condition Whenever LCD shows the temperature setting cannot be adjusted because the appliance is in use by a user which already selected a different temperature. Appliance will be automatically unlocked after closing the hot water tap. B press reset firmly in order to return heater to normal operation. 28 6 720 608 158 Maintenance and service 6 Maintenance and service Warning: Always turn off the electrical power supply, turn off the manual gas shut off valve and turn off the water shut off valves whenever servicing. Caution: B Check and clean the complete water heating system once a year. B Carry out a maintenance overhaul if necessary. Immediately repair defects to avoid damage to the system. Pressure relief valve · Manually open the pressure relief valve to ensure proper operation. Inlet water filter · Verify the inlet filter screen is clean and undamaged. The inlet water filter is located above the ¾" cold water inlet on the right side of the appliance (See Fig. 15, page 12). Close installer supplied cold water shutoff and supplied water shutoffs, carefully remove inlet and outlet clips on watervalve. Remove water vavle to access filter. Clean or replace if damaged. Descaling Annual maintenance table Every year 1. 2. 3. 4. 5. Inspect venting system Inspect heat exchanger Inspect burner Inspect condensate trap Inspect water filter X X X X X