AquaStar 125B NGS manual

WARNING : Improper installation, adjustment , alterat ion, service or maint enance 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 . Upon completion of the installation, these instructions should be handed to the user of the applian[...]

2 6 720 606 518 This well engineered, gas water heater has been specially designed to operate with incoming pre-heated water: 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 exc hanger in the Aquast ar . This same flow opens the gas valv[...]

3 6 720 606 518 D861_059 M I N I M U M I N S T ALLA TI O N C LE ARAN C E S FR O M CO M B U S TI B LE AN D N ON C OM B U S TI B LE MA TE R IALS FO R AL C OVE OR C L O SET I N S T ALLA TI ON S F RO NT VI EW S I DE VI EW A Q U AST AR M OD EL 1 25B S MODEL 125BS TOP (A) 12 " FRONT (B) 4 " BACK 0 " SIDES 4 " FLOOR (C) 12 " VENT [...]

4 6 720 606 518 P RO PE R L OCA TI ON FOR I N ST ALLI NG Y OU R HEA T ER C arefully select the location of your new heater . F or your safety and for proper heater operation, you must provide an abundant supply of combustion air and a proper venting installation. The heater may still operate even when improperly vented. It will, however , be less e[...]

5 6 720 606 518 WARNING: Flammable materials, gasoline, pressurized containers, or any other items or articles that are pot entially fire hazards must NOT be placed on or adjacent to the heat er . T he appliance area must be kept free of all combustible materials, gasoline and other flammable vapors and liquids. COMBUSTION AIR REQUIREMENTS The Aqua[...]

6 6 720 606 518 Fig. 1 - Mounting the Heater Fig. 2 - Inc andescent Particle T ray Illust ration The incandescent particle tray (shipped loose in the carton with the water heater) must be attached at the bottom of the water heater front cover at the time of installation. Use the screws provided. See figure 2 SUPPORT BOARD WALL STUDS 1” X 4” SP [...]

7 6 720 606 518 VENTING V ent pipe connect ion. WARN I NG: Do not reduce the vent pipe size . See Fig . 3 for high altitude inst allations The heater must be vented to the outside following all local ordinances and specifications for installing a gas appliance vent or chimney . The heater must be located as close as practicable to a vertically risi[...]

8 6 720 606 518 MASO NRY CH I MN EY : Masonry 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 (metal double wall T ype B ), or an approved clay flue liner or a listed c himney lining system must be used when venting into a naturally drafting, internal masonr y chimney . 6 [...]

9 6 720 606 518 Fig. 3 – Vent Adaptor for High Altit ude Installat ions 5” X 6” ADAPT O R US E D ON H IG H AL TITU DE 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. Op[...]

10 6 720 606 518 GAS CONNECTIONS and Gas Regulator NO TE : T he Aquast ar 1 25 B”S” is supplied wit h a gas pressure regulator t hat must be installed on t he heater before attaching the gas supply line. See figure 5. Failure to install the gas regulator as shown in figure 5 will be a violation of CSA certific ation of t he unit . T he regulat [...]

11 6 720 606 518 The water heater must be isolated from the gas supply piping system by closing the manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or more than 0.5 psig. The water heater , including the pressure regulator provided with it, must not be operated at gas supply pressures in e[...]

12 6 720 606 518 O PERA T ING INS T R U C TI ONS Before proceeding with the operation of the heater make sure that the system is filled with water . Open the cold water inlet supply to the heater fully . 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 f[...]

13 6 720 606 518 Fig. 8 - Characteristic Pilot Flame 3mm Correct gap between pilot burner tip and piezo electrode tip Piezo Electrode Air screen filter 1 0mm 3/8” Piezo Electrode Thermocouple 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, remove incandescent par[...]

14 6 720 606 518 If some burners have yellow flames while others have good flames, it is likely that dust, lint or spider webs have partially clogged the burner venturis. Contact a gas service person to clean the remove and clean the burners. Mineral S c ale Build-up : The AquaStars heater , when operated at lower temperatures settings, do not accu[...]

15 6 720 606 518 T o test the thermocouple, disconnect the thermocouple lead to the ECO. Insert a multi-meter probe into the thermocouple lead and attach or hold the other lead to the metal gas valve (DC common). Light the pilot flame and hold button, meter reading should be 24 mVDC or more. If the reading is 24 mVDC or more the thermocouple is goo[...]

16 6 720 606 518 See specifications on page 2. Unlike storage tank water heaters, the burners of a tankless water heater must be very powerful to heat water instantaneously since they do this only at the time hot water is actually being used. It is therefore imperative that the gas pressure requirement be met exactly . Insufficient gas pressure wil[...]

17 6 720 606 518 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 . Piezo igniter 8. Location of pressure tap screw 9. W ater valve 1 0 . Gas inlet gas pressure test nipple 5 1 4 7 9 3 10 6 2 8 Fig. 1 0 - Diagram of AquaStar 1 25 BS[...]

18 6 720 606 518 A Q 1 25 BS Fig. 1 1 - I NTER IOR CO MP ON ENTS DIAGR AM AN D P ARTS LI ST[...]

19 6 720 606 518 Fig. 1 1 INTERIOR COMPONENTS DIAGRAM AN D P ARTS LI ST 1 25B S 1 Cov er 8 705 421 033 2 Cap cov er 8 703 304 011 3 Water connection gasket 8 710 103 043 4 Draf t divertor 8 705 5 05 354 5 Heat exchanger 8 705 4 06 189 6 Hot w ater pipe 8 700 705 431 7 Cold w ater pipe 8 700 705 294 8 Heat exchang er washer 8 710 1 03 045 9 Overhea [...]

20 6 720 606 518 Fig. 1 2 - Flow chart of Aquastar 1 25 BS[...]

21 6 720 606 518 LI M ITE D W AR R ANT Y Aquast ar General Aquastar water heaters are warranted by the Manufacturer ( B OSC H) through BB T North America . BB T North America (B BTNA ) will furnish a replacement heat exc hanger and will furnish a replacement of any other part which fails in normal use and service within the applicable periods speci[...]

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Replacement Parts available: BB T NO RTH AM E R IC A Bosch Group Bosch W ater heating 340 Mad River Park W aitsfield, V ermont 0567 3 Phone 80 0-642-3 1 1 1 Fax (802) 496-6924 www .boschhotwater .com tec hsupport@boschhotwater .com VULCANO T ermodomésticos S.A. Estrada de Cacia 3801 - 856 Aveiro - PORTUGAL 3 1 e g a p e e s E L B A T E C N A N E T[...]