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Bosch Appliances 125FX NG - page 1
W ARNING : Improper inst allation, adjustment, alteration, service or maintenance 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 ...
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Bosch Appliances 125FX NG - page 2
2 AquaStar 125FX LP and 125FX NG Specifications Water Connection 1/2” Thread fitting NPT H x W x D 29 3/4” x 18 1/4” x 8 3/4" V ent 4” (Category III Gas Appliance) Gas Connection 1/2” NPT thread Min. Water Pressure 18 Psi Max. Water Pressure 150 Psi Shipping Weight 50.6 LB Net Weight 44 LB 2.0 GPM at 90 ° rise 4.0 GPM at 45 ° rise ...
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Bosch Appliances 125FX NG - page 3
3 MINIMUM INST ALLA TION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MA TERIALS FOR ALCOVE OR CLOSET INST ALLA TIONS FRONT VIEW SIDE VIEW AQUAST AR MODEL 125FX D084_089 * On a combustible wall surface the unit should be mounted away from the wall to provide adequate clearance of the vent pipe. See page 5 for instructions. ** Some local codes re ...
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Bosch Appliances 125FX NG - page 4
4 GENERAL RULES TO FOLLOW FOR SAFE OPERA TION 1. Y ou should follow these instructions when you install your heater . In the United S tates: The inst allation must conform with local codes or , in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFP A 54. In Canada: The Installation should conform with CGA B149.(1,2) INST ALLA TIO ...
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Bosch Appliances 125FX NG - page 5
5 COMBUSTION AIR REQUIREMENTS The AquaS t ar water heater holds cold water in its copper heat exchanger and brass water valve when not in use. Because of this, any cold air that comes in through the unit’s vent pipe is capable of freezing these components. This Installation Manual specifies the vent length requirements and the amount of combustio ...
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Bosch Appliances 125FX NG - page 6
6 Fig. 3 - Incandescent Particle T ray Illustration 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 3. SCREWS INCANDESCENT P ARTICLE TRA Y Fig. 2 - Mounting the Heater W ALL STUDS 1” X ...
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Bosch Appliances 125FX NG - page 7
7 Fig 4: Some V enting Guide Suggestions An approved side wall vent terminal must be used when the water heater is vented through a side wall. Locate in accordance with ANSI Z223.1 and local applicable codes. See Fig 5 for restrictions in location of vent terminal in relation to opening doors and windows, grade, and forced air inlets. Be certain th ...
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Bosch Appliances 125FX NG - page 8
8 Fig 5: Side wall exit locations for mechanical draft vent terminals SOFFIT VENT HOOD 7’ MINIMUM ABOVE PUBLIC WALKW A Y ONE FOOT ABOVE GRADE 3’ ABOVE ANY FORCED AIR INLET WITHIN 10’ 4’ MIN 1’ MIN 4’ MIN 4’ MIN 4’ MIN 1’ MIN VENT HOOD MUST BE MOUNTED FOUR FEET AW A Y FROM DOORS AND WINDOWS VENT HOOD MUST BE MOUNTED FOUR FEET MINIM ...
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Bosch Appliances 125FX NG - page 9
9 GAS PIPING , CONNECTIONS and Gas Regulator 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 S tates: The inst allation must conform with local codes or , in the absence of local codes, the National Fuel G ...
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Bosch Appliances 125FX NG - page 10
10 Fig. 6 - Appliance pressure regulator (with directional arrow on reverse side pointing up) 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 m ...
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Bosch Appliances 125FX NG - page 11
11 - T ypical setups are shown below with the pressure relief valve attached. The pressure relief valve is supplied with the heater , and should only be fitted on the hot water outlet as shown. The cold water inlet setup will be identical to diagrams below but without the pressure relief valve. - For ease of installation the piping setup should be ...
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Bosch Appliances 125FX NG - page 12
12 6. 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 power exhaust will then activate. 7. The pilot flame will extinguish 10-30 seconds after the burners come on. The burners will remain ...
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Bosch Appliances 125FX NG - page 13
13 Fig. 13 - Characteristic Pilot Flame Flame sensor Piezo Electrode Pilot Flame: The pilot flame should burn with a clean, sharp, blue flame and should resemble the diagram in Fig. 13. If the flame is soft and yellow , the pilot burner orifice may need to be cleaned or replaced. The pilot flame should be approximately 2 inches long, extending past ...
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Bosch Appliances 125FX NG - page 14
14 3. W ater flow is not sufficient to activate heater . Water flow rate at faucet is below minimum flow needed to activate heater . When temperature adjustment knob is turned all the way clockwise, the AquaS t ar model 125FX requires 1/2 gallon per minute flow to activate the heater . As a reference, this is a flow which would fill a quart jar in ...
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Bosch Appliances 125FX NG - page 15
15 Mineral deposits can eventually (3-5 years in hard water areas) corrode the water valve parts to a point where they will need replacing. Any sign of moisture at the bleed hole is a sign that the water valve needs to be replaced immediately . 10. Loose connection at the ECO Ignition sparker will not operate if the electrical circuit is interrupte ...
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Bosch Appliances 125FX NG - page 16
16 WA TER IS T OO HOT 1 . T emperature Selection too high Turn the temperature adjustment knob counter-clockwise (to the left) to lower the maximum water temperature. Note: This will increase the activation flow rate. 2. Inlet water temperature is very warm (60º-75ºF) Reduce inlet gas supply to lower the heaters degree rise. Note: Only the Model ...
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Bosch Appliances 125FX NG - page 17
17 5 11 1 4 9 10 12 2 6 8 Fig. 17 - Diagram of AquaSt ar 125FX 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. Electronic control box 8. Power cord 9. on/off switch 10. T emperature adjustment selector 1 1. Microswitch 12. Gas inlet gas pressure test nipple 13. E ...
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Bosch Appliances 125FX NG - page 18
18 Fig. 18 INTERIOR COMPONENTS DIAGRAM AND P ARTS LIST 125FX 1 Front Cover 8 705 421 255 2 AquaS tar Decal 8 701 103 074 3 Plastic lower snap-on 8 705 506 451 4 T emperature adjustment knob complete 8 702 000 219 5 T emperature adjustment knob 8 702 000 1 1 1 6 Exhaust fan assembly 8 707 204 023 7 Draft diverter 8 705 505 451 8 Fan protection 8 701 ...
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Bosch Appliances 125FX NG - page 19
19 Fig. 18 - INTERIOR COMPONENTS DIAGRAM AND P ARTS LIST ...
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Bosch Appliances 125FX NG - page 20
Replacement Parts available from North American Distributor CONTROLLED ENERGY CORP . 340 Mad River Park W ait sfield, V ermont 05673 Phone 800-642-31 11 Fax (802) 496-6924 ww w .controlledenergy .com techsuppport@controlledenergy .com VULCANO T ermodomésticos S.A. Estrada de Cacia 3801 - 856 Aveiro - PORTUGAL 4 1 - 3 1 s e g a p e e s E L B A T E ...
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