Instantaneous gas water heater Models W 125...T1 · installation · operation · maintenance The Bosch instantaneous water heater is a high efficiency, space saving answer to your water heating needs. All Bosch instantaneous water heaters heat water only as required; no energy is lost maintaining a large volume of water at elevated temperatures as in tank-type storage water heaters. Suitable for heating potable water only ­ not approved for space heating purposes. READ INSTRUCTIONS CAREFULLY BEFORE INSTALLING 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 applicance. - WHAT TO DO IF YOU SMELL GAS · 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. NOTICE TO INSTALLER: Please leave this manual with the owner or affix adjacent to appliance. 6 720 606 447 CA (05.05) AL ASTRAVAN DISTRIBUTORS, LTD. 123 Charles Street North Vancouver, B.C. V7H 1S1 Phone Canada: (604) 929-5488 Phone USA: (206) 860-8448 Web Site: www.astravan.com Note: In case of problems please contact your salesman or installer DIMENSIONS Figure 1 Maximum hydrostatic water pressure - 0.97 MPa (150 p.s.i.) Maximum recommended working pressure - 0.69 MPa (100 p.s.i.) Minimum working pressure - 0.01 1 MPa (2 p.s.i.) at 1.6 Litres/min. (0.5 U.S. Gal/min.) free discharge Minimum recommended inlet water pressure for use with showers 40 p.s.i.g. NG Tap pressure inch Manifold burner pressure inch Altitude Standard High 5,7 4,6 3,35 2,7 LPG Tap pressure inch Manifold burner pressure inch Altitude Standard High 10,5 8,4 10,2 8,1 Dimensions in millimetres (inches) A 270 (10 5/8) B 610 (25 3/8) C 230 (9 1/8) D 190 (7 1/2) E 70 (2 3/4) F 562 (22 1/8) G 350 (13 3/4) H 312 (12 1/4) I 102 (4) J 138 (5 3/8) Model W 125 K... W 125 K... Type of Gas natural propane natural propane Altitude standart (0-2,000 ft.) high * (2,000-4,500 ft.) Input 11.7 kW (40,000 Btu/hr) 10.5 kW (36,000 Btu/hr) Main Burner Orifices Size, mm Qt. 1.25 diam. 6 0.76 diam. 6 1.25 diam. 6 0.76 diam. 6 * The high altitude ratings listed are Canadian Gas Association high altitude ratings and are only valid in Canada. In the U.S., the National Fuel Gas Code, ANSI Z223.1/NFPA 54 recommends for high altitude installations above 2,000 feet, that the input rate be reduced 4% for each 1,000 feet above sea level. 2 FORWARD This design complies with CAN 1-4.3-77 and ANS1 Z21.10.3b 1994 as an instantaneous gas water heater. In addition the unit complies with CAN1-2.17-M80 for use at high altitude, 2.000-4.5000 feet above sea level. Instalation, operation and maitenance information is provided in this manual. Installation and operation instructions should be thoroughly reviewed before proceeding with installation of the BOSCH instantaneous gas water heater. The BOSCH instantaneous gas water heater is designed to operate on natural or propane gas; however, make sure that gas on which heater is to operate is the same as specified on the heater's model/rating plate. In addition to these instrutions,the water heater shall be installed in accordance with CAN1-B149 Installation Code (in Canada) or ANSI Z223-1/NFFA 54 National Fuel Gas Code (in U.S.) and/ or local installation cades. These shall be carefully followed in all cases. INSTALLATION INSTRUCTIONS Note: Proper plumbing, venting, gas connections and an adequate supply of combustion air are required for safe and reliable operation. Ability equivalent to that of a licensed tradesman in the field involved is required for installation and/or servicing of these water heaters. In unconfined spaces, in buildings of normal construction, infiltration normally is adequate to provide air for combustion, ventilation and dilution of flue gases. However, a confined space must be provided with two permanent openings to provide combustion and ventilation air to the appliance. Each opening shall have a free area of on square inch per 1,000 Btu/hr of total input rating of all the appliances in the enclosure, but not less than 100 square inches. One opening shall be within 12 inches of the top and one within 12 inches of the bottom of the enclosure. For either a confined or unconfined space in a building of tight construction, with inadequate infiltration, air must be drawn from the outdoors or from spaces that freely communicate with the outdoors. Two permanent openings located as indicated above are to be provided as follows: 1. When communicating with outdoors directly, or by means of vertical ducts, each opening shall have a free area of not less than one square inch per 4,000 Btu/hr of total input of all appliances in the space. 2. When communicating with outdoors by means of horizontal ducts, each opening shall have a free area of not less than one square inch per 2,000 Btu/hr of total input of all appliances in the space. LOCATION Before installing the BOSCH instantaneous gas water heater consideration must be given to proper location. The BOSCH W125K... instantaneous gas water heater may be installed to supply hot water to remote locations. Location should be as close to a chimney or gas vent as practical, in an area with an adequate air supply and as centralized with the piping system as possible. The heater should not be located in an area where it will be subject to freezing. The heater should be located in an area where leakage of the heater or its connections will not result in damage to the area adjacent to the heater or to lower floors of the structure. Note: When such locations can not be avoided, it is recommended that a suitable drain pan, adequately drained, be installed under the heater. The pan must not restrict combustion air flow. AIR REQUIREMENTS For safe operation, sufficient air for combustion, ventilation and dilution of flue gases must be available. An insufficient supply of air will result in a yellow luminous burner flame, causing carboning or sooting of the heat exchanger. 3 WARNING 1. Flammable materials, gasoline, pressurized containers, or any other items or articles that are potentially fire hazards must never 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. 2. Do not obstruct the flow of combustion and ventilation air to the appliance. CLEARANCES This heather is designed certified for installation on a combustible wall, in an alcove with minimum clearances to combustible construction of 51mm (2 inches) from sides, 305mm (12 inches) from top and bottom. A minimum of 305mm (12 inches) shall be allowed for maintenance of serviceable parts. Clearance from vent is dependent upon the clearance rating of the venting material used; that is type B-1 vent is approved for 1 inch clearance, B-2 vent for 2 inch, etc. G772_179 Figure 2 RELIEF VALVE The listed pressure relief valve supplied must be installed near the hot water outlet at time of installation of the heater. No valve is to be placed between the relief valve and the heater. A drain line must be connected to the relief valve to direct discharge to a safe location. Do not install reducing coupling or any other restriction in the discharge line. The discharge line must be installed so as to allow complete drainage of both the valve and the line. MOUNTING The W125K...is designed certified for mounting to a wall. The heather must not be installed directly on a carpeted wall. The heather must be mounted to the wall using appropriate anchoring materials, through the four holes provided. Expansion and contraction of piping due to changing water temperature in pipes imparts movement to heater which, if mounted directly to a brittle, board such as plasterboard can cause failure of mounting. Heater must be mounted level to assure proper operation. GAS CONNECTIONS Before connecting the gas supply to the heater check heater's model/rating plate to make sure that gas on which heater is to operate is the same as specified on the model/ rating plate. The W125K...instantaneous gas water heater is supplied with a gas pipe, a gas pressure regulator and a manual gas cock that must be installed on the heater before attaching the gas supply line, see figure 3. Failure to install gas pipe, the main manual gas valve and the pressure regulator, or the failure to install them in the sequence show in figure 3 will be in violation of the A.G.A. and C.G.A. certification of the unit and can cause damage to heat changer. BOSCH water heaters are shipped from the factory with the gas pressure regulators preset for the gas shown on the rating plate to the correct pressure. In Canada, for high altitude operation; In U.S., for standard altitude operation unless specially marked as a high altitude unit. VENTING The BOSCH model W125K... instantaneous gas water heater has a built-in a draft diverter is designed for indoor installation only. The draft diverter outlet must be connected to a clear, unobstructed vent of the same size or larger, refer to: In Canada, CAN 1-B149 Installation Code for detailed requirements In U.S., ANZI Z223.I/NFPA 54 National Fuel Gas Code for detailed requirements The minimum length of a vertical vent up to the terminal must be 2 ½ feet. WATER CONNECTIONS The W125K comes supplied with a ½'' NPT cold water inlet adapter and a flexible wire braid hot water outlet with a ½'' NPT connection. 4 Check to make sure that the gas listed on the rating plate is same as gas listed on the pressure regulator. See PRESSURE REGULATION section of this manual for information regarding gas pressure settings. Note: Before attaching the gas supply line, be sure that all gas pipe is clean on the inside. To trap any dirt or foreign material in the gas supply line, a dirt leg must be incorporated in the piping. The drip leg must be readily accessible and not subject to freezing conditions. Install in accordance with recommendations of serving gas supplier. Joint compounds (pipe dope) shall be applied sparingly and only to the male threads of pipe joints. Do not apply compound to the first two threads. The joint compound used must be resistant to the action of liquified petroleum gases. Before placing water heater in operation check for gas leakage. Soap and water solution, or other material acceptable for this purpose, shall be used in locating gas leaks. Matches, candles, lighters, or other ignition sources shall not be used for this purpose. PROPANE SUPPLY Figure 4 Where used with propane (LP gas) a separate correct propane regulator must be installed at propane tank to deliver propane to BOSCH regulator at 11'' W.C. pressure. PRESSURE TAP PRESSURE REGULATOR MANUAL GAS VALVE Figure 3 WARNING The heater and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess 3,45 KPa (½ psig). The water heater must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 3,45 KPa (½ psig). The water heater, including the pressure regulator and manual valve provided with it, must not be operated at gas supply pressures in excess of 3,45 KPa (½ psig).If overpressure has occurred such as through improper testing of the gas lines or emergency malfunction of the supply system, the gas valve and regulator must be checked for safe operation. Make sure that the outside vent valves are protected against blockage. These are part of the gas supply system, not the water heater. Vent blockage may occur during ice storms. 5 OPERATING INSTRUCTIONS WARNING If the water heater has been damaged or exposed to flooding, fire, or sooting do not operate the heater until all corrective steps have been taken by a qualified serviceman. FILLING Before proceeding with operation of the water heater make sure that the system is filled with water. Turn the water flow selector handle clockwise ( ) against stop. Open all hot water faucets connected to the W125K...to allow trapped air to escape from heater and piping. Close all faucets, once water flows freely and all air has escaped from system. The water heater is now ready to be lit. SERVICE HINT The screen (strainer) in the water valve, located in inlet of the water valve, may require occasional cleaning due the foreign material in the water supply. This will restrict the flow of water and may affect heater operation and prolong filling ...