Bosch Appliances 125B NG manual

W ARNING : Improper installat ion , adjust ment , alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional informat ion consult a qualified inst aller , service agency or t he gas supplier . Upon completion of the installation, these instructions should be handed to the user of the a[...]

2 6 720 607 030 This well engineered, gas water heater has all the fea- tures a water heater should have: It operates on the principle of heating water instantaneously “on demand”. When a hot water faucet is opened, cold water flows through the coils of the heat exchanger in the Aquast ar. This same flow opens the gas valve, and the burners are[...]

3 6 720 607 030 M I N I M U M I N S T ALLA TI O N C LE ARAN C E S F R OM C O M B U S TI B LE AN D N O N C OM B U STI B LE MA TE R IALS F OR AL COVE O R C L O SET I N S T ALLA TIO N S FR ONT VI EW SI DE VI EW A QUAST AR M ODE L 1 25B MODEL 125B TO P ( A) 12 " FR ONT ( B) 4 " BAC K 0 " SIDE S 4 " FLOOR (C) 12 " VENT DIA M ETE[...]

4 6 720 607 030 G EN E RAL R U L E S T O FOLL O W FOR SAFE OPE R A TI ON 1. Y ou should follow these instructions when you inst all 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 ANS I Z223. 1 / N FP A 54. In Canada: The Installation should conform w[...]

5 6 720 607 030 Fig. 1 - Water heater drain plug WARNING: Flammable materials, gasoline, pressurized containers, or any other items or articles that are potent ially fire hazards must NO T be placed on or adjacent t o the heater . The appliance area must be kept free of all combustible materials, gasoline and other flammable vapors and liquids. COM[...]

6 6 720 607 030 Expansion and contraction of piping due to changing water temperature in the pipes imparts movement to the heater which, if mounted directly to a brittle, friable board, such as plasterboard, can cause failure of mounting. In earthquake-prone zones, C EC recommends that installers use a large washer and lag screw through the existin[...]

7 6 720 607 030 V ent pipe connection. WARN I NG: Do not reduce t he vent pipe size . See Fig . 4 for high altit ude installat ions The heater must be vented to the outside following all local ordinances and specifications for installing a gas appliance vent or c himney . The heater must be located as close as practicable to a vertically rising c h[...]

8 6 720 607 030 MASON RY CH IM NEY : Masonr y chimneys shall be built and installed in accordance with N FP S 2 1 1 or local codes . A minimum 5” diameter gas vent pipe (met al double wall T ype B ), or an approved clay flue liner or a listed chimney lining system must be used when venting into a naturally drafting, internal masonry c himney . 6 [...]

9 6 720 607 030 T o check t he draft : Close all doors and windows to the outside. T urn on all appliances that force air out of the building . These include all exhaust/ventilation fans, furnaces, clothes dryers, wood burning stoves, etc. Open all doors between the AquaStar and these other appliances. With the control knob set fully clockwise and [...]

10 6 720 607 030 GAS LINE SIZING -It is strongly recommended that the Natural Gas pipe be Black Iron pipe the entire distance from the outside meter to the inlet of t he Aquast ar regulat or . 1 /2” Black Iron pipe up t o 1 0 feet , 3/ 4 ” Black Iron pipe up to 4 0 feet and 1” Black Iron pipe up to 1 50 feet distances. Flex line tubing is NOT[...]

11 6 720 607 030 GAS PIPING, CONNECTIONS and Gas Regulator Before connecting the gas supply, c heck 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 St ates: T he installation must conform with local codes or, in the absence of local codes , the N[...]

12 6 720 607 030 W A TE R CO N NECTIO N S Install the heater centrally in the building if possible and make hot water piping runs as short as possible When facing the heater , the cold water inlet will be on the right and the hot water outlet on the left.. Although water piping throughout the building may be other than copper , copper or galvanized[...]

13 6 720 607 030 LIGHTING INSTRUCTIONS (as seen on front cover of heater) 1. S T O P! Read the safety information above on this plate. 2. The Gas valve must be turned off by sliding the gas valve button to the far left under the OFF ( ) mark. 3. W ait five (5) minutes to clear out any gas . If you smell gas , ST O P! Follow “B” in the s afety i[...]

14 6 720 607 030 T o clean t he pilot burner and/ or t he pilot orifice : T urn off the gas at the unit . Remove the cover of the heater . T o do so, pull off the temperature adjustment knob and unscrew and remove the plastic collar and unscrew the central screw located at the bottom of the front cover . Pull main cover out toward you and lift up a[...]

15 6 720 607 030 3 . Poor thermocouple connection at the electromagnet Note : Electromagnet is part #8 7072 0 1 01 2 l ocated on the right side of the gas valve behind the piezo push-button assembly . Check the tightness of the thermocouple connection nut at the electromagnet: The Electro-magnet connection is a large aluminum 1 7mm hex head nut. Th[...]

16 6 720 607 030 5 . Crossover in household plumbing The AquaStar burner activates when there is sufficient water pressure drop in the AquaStar water valve assembly — i.e. when a hot water faucet is opened. If there is a crossover in the plumbing, the necessary pressure drop in the AquaStar will be insufficient, or totally eliminated. A plumbing [...]

17 6 720 607 030 H O T WA T E R TE MP E RA TU R E F LUCTU A T E S / U N IT DEA C T IV A T ED 1 . Unbalanced pressure in waterlines The added restriction caused by the Aquastar in the hot water system can result in uneven pressures between the cold and the hot. In such cases when mixing cold water at the tap, the lower hot water pressure may be over[...]

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19 6 720 607 030 Fig. 1 2 - Diagram of AquaStar 1 25 B 1 . Heat exchanger 2. Pilot assembly 3. Burner manifold gas pressure test nipple 4. Main gas burner 5. Pilot gas tubing 6. Gas valve 7 . Pressure tap screw location 8. Gas control slide 9. Piezo igniter 1 0 . W ater valve 1 1. T emperature adjustment selector 1 2 . Gas inlet gas pressure test n[...]

20 6 720 607 030 Fig. 1 3 - I NTER I O R C OMP ON E NTS DIAGRAM AND P ARTS LIST[...]

21 6 720 607 030 Fig. 1 3 INTERIOR COMPONENTS DIAGRAM AN D P ARTS LIST 1 25B 1 Cover 8 705 421 025 2 Temp e ratu re ad justment knob 8 702 000 111 3T e m p era tur e ad j ustment co l la r 8 700 403 008 4 Dra ft diverter 8 705 505 354 5 Hea t exchange r 8 705 406 235 6 Outlet flex h o se 8 700 703 130 7 Wa sher 8 700 103 658 8 Cold water pipe 8 700[...]

22 6 720 607 030 LI M ITE D W AR R ANT Y Aquast ar 06.03 General Aquastar water heaters are warranted by the Manufacturer (B O SC H) through C ontrolled Energy C orp. C ontrolled Energy Corp . ( C EC ) will furnish a replacement heat exchanger and will furnish a replacement of any other part which fails in normal use and service within the applicab[...]

23 6 720 607 030 Fig . 1 4 - Flow chart of Aquast ar 1 25 B[...]

Replacement Parts available from North American Distributor CONTROLLED ENERGY CORP . 340 Mad River Park W ait sfield, V ermont 05673 Phone 800-642-31 1 1 Fax (802) 496-6924 ww w .controlledenergy .com/tech techsupport@controlledenergy .com Recycled paper 4 1 & 3 1 s e g a p e e s E L B A T E C N A N E T N I A M R A E Y Y R E V ES R A E Y 2 Y R [...]