Bosch 125X NG - Manuals

5 Louvers, grills and screens have a blocking effect. If theeffective free area is not known, increase the sizes of youropenings by 75% if your louvers are wood and by 30% ifyour louvers are metal. Refer to the National Fuel Gas Codefor complete information. In buildings of tight constructionall air...

6 Fig. 2 - Incandescent Particle Tray Illustration at least 1/4 inch for every foot of its horizontal length. Keepthe horizontal section short and avoid too many elbows. To check the draft:Close all doors and windows to the outside.Turn on all appliances that force air out of the building.These incl...

7 GAS CONNECTIONS and Gas Regulator Before connecting the gas supply, check the rating plateon the right side of the front cover to be sure that the heateris rated for the same gas to which it will be connected.In the United States: The installation must conform withlocal codes or, in the absence of...

8 OPERATING INSTRUCTIONSBefore proceeding with the operation of the heater makesure 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 heaterand the piping and to eliminate the air trapped in the systemClo...

9 The position you select on the temperature adjustment knobwill depend on the temperature of the incoming water (50°Fis average in the U.S.). In warm weather regions where theincoming cold water is generally warmer, or during the hotweather months in some other areas a midway setting onthe temperat...

10 MAINTENANCE AND SERVICE REVIEW MAINTENANCE TABLE ON THE BACKOF THIS MANUALApproximately once a year, the AquaStar should be checkedand cleaned. To remove the front cover, first remove theincandescent particle tray, then pull off the temperatureadjustment knob and unscrew and remove the plastic co...

11 NO SPARK AT THE PILOT 1. On/Off switch is not ”On” (Position I ). The On/Off switch is located behind the flipdown coverplate on the front panel strip. See fig. 9. 2. Water flow is not sufficient to activate heater.Water flow rate at faucet is below minimum flow neededto activate heater. When tem...

13 5 11 1 4 9 10 3 12 2 6 7 8 Fig. 14 - Diagram of AquaStar 125 X 1. Heat exchanger 2. Pilot assembly 3. Burner manifold gaspressure test nipple 4. Main gas burner 5. Pilot gas tubing 6. Gas valve 7. Electronic control box 8. Battery box 9. on/off switch 10. Temperature adjustment selector 11. Micro...

14 Fig. 15 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST

15 Fig. 15 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 125X 1 Front cover ¤ 8 705 421 255 2 Temperature adjustment knob comp. ¤ 8 702 000 219 3 Temperature adjustment knob ¤ 8 702 000 111 4 Water connection gasket ¤ 8 710 103 043 5 Draught diverter ¤ 8 705 505 354 6 Heat exchanger ¤ 8 705 406 235 7 H...

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