User manual BOSCH GWS 8-115

[. . . ] 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. · Do not try to light any appliance · Do not touch any electrical switch; do not use any phone in your building · If you cannot reach your gas supplier, call the fire department. · Immediately call your gas supplier from a neighbor's phone. [. . . ] The regulator supplied with the heater is preset for the gas shown on the rating plate to the correct pressure. It is an appliance level regulator designed for (low inlet) pressure (less than 1/2 Psig or 15" W. C. ) DO NOT connect to an unregulated or high pressure propane line or to a high pressure commercial natural gas line. GAS INLET PIPE PRESSURE TAP PLASTIC CAP APPLIANCE PRESSURE REGULATOR (with directional arrow on reverse side pointing upward) Fig. 6 - Appliance pressure regulator (with directional arrow on reverse side pointing up) GAS LINE SIZING The pressure regulator provided with the heater is adjusted to deliver the proper gas pressure (as indicated on the rating plate and in the manual for altitude up to 2000 feet (660 meters) above sea level. On appliances being installed above 2000 ft (660 meters) elevation, the inlet gas pressure should be set at installation to the value shown below. NOTE: The gas pressures specified below refer to pressures taken at the pressure tap on the gas inlet pipe just above the regulator (See Fig 6). These readings should be taken while the heater is operating at full input -- i. e. maximum water flow with the temperature dial selector turned all the way clockwise. MAXIMUM INLET GAS FLOW PRESSURE SETTINGS Altitude 0' - 2. 000 ft 2. 000 ft - 4. 500 ft Natural Gas inches W. C: 5. 7" 4. 6" Liquid Propane inches W. C: 10. 5" 8. 4" Above 4. 500 ft consult your local gas provider. 6 720 607 017 11 GAS PIPING, CONNECTIONS Before connecting the gas supply, check the rating plate on the right side of the front cover 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 should conform with CGA B149 INSTALLATION CODES and /or local installation codes. GAS LINE SIZING 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. (Based on a 0. 60 Specific Gravity Gas) Btu numbers given in thousands. Nominal Iron Pipe Size, Internal Diameter 10 32 72 132 278 520 1050 1600 3050 4800 8500 20 22 49 92 190 350 730 1100 2100 3300 5900 30 18 40 73 152 285 590 890 40 15 34 63 130 245 500 760 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 1250 2200 150 8 17 31 64 120 250 380 710 175 7 15 28 59 110 225 350 650 200 6 14 26 55 100 210 320 610 980 Le ngth of Black Iron Pipe , Fe e t Follow boxed numbers for piping just one 425 EF (example: 3/4" B. I. (Fig 9). 123456- microswitch On / Off switch temperature limiter flue gas safety device burner electrovalve pilot electrovalve 7 - Diaphragm switch 8 - ionization probe (flame sensor) 9 - fuse 10 - pilot electrode 11 - electric control box 12 -power cord 13 - exhaust fan Fig 9: Wiring Diagram for 425 EF 14 6 720 607 017 OPERATING INSTRUCTIONS Before operating the heater, make sure that the system is filled with water. Open a hot water faucet to permit the water to fill the heater and the piping and to eliminate the air trapped in the system Close the hot water faucet after the water flows freely and all the air has escaped from the system. Turn the hot water faucet on to the minimum flow required to activate the heater. The automatic ignition system first ignites the safety pilot burner which then ignites the main burner in about 4 seconds. The pilot flame will extinguish 10-30 seconds after the burners come on. NOTE: On a first time installation, existence of air in the gas supply line and in the water line may cause some ignition delay. In that case, repeatedly open and close the hot water tap in order to restart the ignition process until all the air has been purged. TO TURN OFF GAS TO APPLIANCE Turn off the manual lever on the gas supply line to the heater and set the ON/OFF switch to the OFF ( ) position, see Fig. 10. FOR YOUR SAFETY READ BEFORE OPERATING YOUR HOT 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. This appliance is equipped with electronic ignition for lighting the pilot and main burners. Before operating the unit, set the On/Off switch to the On ( ) position. [. . . ] 17 - Flow chart of 425 EF 24 6 720 607 017 Fifteen Year Limited Warranty General B OSC H PRO water heaters are warranted by the Manufacturer (BOSCH) through Controlled Energy Corp. (CEC) will furnish a replacement heat exchanger and will furnish a replacement of any other part which fails in normal use and service within the applicable periods specified below, in accordance with the terms of this warranty. The CEC replacement will be warranted for the unexpired portion of the original warranty. This warranty will be valid only for water heaters in possession of the original purchaser as recorded on the warranty card. [. . . ]