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Bosch Appliances 250 SXO NG - page 1
MO DE L 25 0 SX O - O UTDOO R M OD E L For exterior use only Elec t ron ic Ignitio n and built in Freez e pr ote c tio n Suit able for hea t ing pot able wat er onl y Not appr oved for spac e heat ing purpos es 250 S XO NG - Na tural G as 250 S XO LP - L iquefied Petroleum (LP) G as 6 720 607 440 US (05.03 ) JS Warning: If the informatio n in this ...
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Bosch Appliances 250 SXO NG - page 2
6 720 607 440 2 Index Index 1 Warning 2 2 Appliance details 4 2.1 Features 4 2.2 250 SXO Specifications (Technical data) 4 2.3 Dimensions and Minimum installation clearances 6 2.4 General rules to follow for safe operation 7 2.5 Proper location for installing your heater 7 2.6 Heater Placement and Clearances 8 2.7 Mounting installation 8 2.8 Gas pi ...
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Bosch Appliances 250 SXO NG - page 3
6 720 607 440 Warning 3 What to do if you smell gas • Close gas valve . • Do not try to l ight any appliance. • Do not touch any electrical switch; d o not use any phone in your bui lding. • Immediately call your gas suppli er fro m a ne ighbor’s phone. Follow th e gas supplier’s in structions. • If you cannot reac h your gas suppl ie ...
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Bosch Appliances 250 SXO NG - page 4
6 720 607 440 4 Appliance de tails 2 Appli ance de tails 2.1 Features Parts • Touch Pad interf ace control • High power pre-mix compact burner with low NOx emissions • Modulating Gas V alve with con stant gas: air ratio control • Modulating water valve for improved comfort and temperat ure control • Freeze protection. Safety • Flame sen ...
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Bosch Appliances 250 SXO NG - page 5
6 720 607 440 Appliance detai ls 5 Combustio n • NOx ≤ 55 ppm • CO ≤ 250 ppm. Dimensio ns • Depth (in): 8 ½” (220 mm) • Width (in): 15 ¾ ” (400 mm) • Height (in): 26” (650 mm) • Weight: 47 poun ds (21 kg). Gas types Natural Gas. LP Gas. CO 2 analyzer i s required t o convert from one gas t ype to another. Please contact CEC ...
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Bosch Appliances 250 SXO NG - page 6
6 720 607 440 6 Appliance de tails 2.3 Dimensions and Minimum installation clearances Fig. 3 Dimensions 1 Cover 2 On/Off s witch 3 Reset button 4 LCD d isplay 5 Program button 6 Tempe rature bu ttons Fig. 4 Minimum clea rances Model 250 SXO TOP (A) 3 ft. FRONT (B) 4 ft. BACK 0” SIDES 4 ft. BOTTOM (C) 1 ft. Table 1 Minim um clearances ...
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Bosch Appliances 250 SXO NG - page 7
6 720 607 440 Appliance detai ls 7 2.4 General r ules to f ollow for sa fe operation B 1. You should follow these instruction s when y ou install your heater. In the United States: The installation must conform with loca l cod es or, in t he absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFP A 54. In C anada: The In stallation shoul ...
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Bosch Appliances 250 SXO NG - page 8
6 720 607 440 8 Appliance de tails 2.6 Heater Placement and Clearances The 250 S XO is design certified for in stallation directly on a combu stible wall. (se e 2.7 Mou nting in stallation) For install ation on vinyl siding see Fig . 10. K eep the a rea below the heate r free of combus tible material. Minimum cle arances If the appliance is install ...
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Bosch Appliances 250 SXO NG - page 9
6 720 607 440 Appliance detai ls 9 B After i nspection, replace front c over a nd tight en screws, then repla ce plastic decal shields. B Fix the to p ve nt cap on th e top of t he heater, as shown i n Fig. 8). Make sure the vent cap is well fitted by taking spe cial care that the f ront cover sta ys inside the extended corners of the v ent cap, as ...
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Bosch Appliances 250 SXO NG - page 10
6 720 607 440 10 Appliance de tails 2.8 Gas piping & connections Before connecting the gas supply, check the r ating plate on the right side of the hea ter to be sure that the heater i s rated for the s ame gas to whic h it w ill be connected. In the United States: The installation must conform with local codes or, in the ab sence of loc al cod ...
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Bosch Appliances 250 SXO NG - page 11
6 720 607 440 Appliance detai ls 11 FOR NA TU R AL GAS Maximum C apacity of pipe in Cub ic Feet of Gas per Hou r for Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3 in W ater Column (0.75mb ar).(Based on a 0.6 0 Specific Gravi ty Gas) Btu number s given in thousands. Fig. 12 Follow boxed numbers for piping just one 250 SXO (exampl e: ¾ ...
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Bosch Appliances 250 SXO NG - page 12
6 720 607 440 12 Appliance de tails 2.9 Measuring gas pressure 2.9.1 Connecting Manometer B Shut off gas. B Remove front cov er and locat e inle t ga s pressure measuring point (see Fig. 14). B Loosen screw inside test point fitting (do not remove) and conne ct manometer tube on test point. 2.9.2 Static Press ure Test B Turn gas s upply back on. B ...
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Bosch Appliances 250 SXO NG - page 13
6 720 607 440 Appliance detai ls 13 2.10 Water connections When facing the heater, the ¾” co ld water inlet is o n the bottom right and the hot water o utlet is on the bottom left. Install th e heater where it’s centrally close to hot water use poin ts if possible, and make hot water piping runs as short as possible. Fig. 15 B THE USE OF A UNI ...
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Bosch Appliances 250 SXO NG - page 14
6 720 607 440 14 Appliance de tails 2.11 E lectrical connections The 250 SXO requires an electrica l power suppl y from a 120 VAC 60H z circuit and must be properly grounded. A means for switching off the 120VAC powe r supply must be prov ided. The heate r is wired as sh own in the wiring diagra m (chapter 6, Fig. 29). Fig. 17 2.12 Operating instru ...
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Bosch Appliances 250 SXO NG - page 15
6 720 607 440 Appliance detai ls 15 2.13 For your saf ety read before operating your water heater A. This appliance is equi pped with elec tronic ignition for lighting the m ain burners . When turning the heat er on, follow these in structions exactly . B. Before o perating the unit, turn t he On/Off switch to the right posi tion. WH A T TO DO I F ...
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Bosch Appliances 250 SXO NG - page 16
6 720 607 440 16 Operation i nstructions 3 Oper ation inst ructions Fig. 19 1 On/Off s witch 2 Reset button 3 Program button 4 Increa sing temp erature bu tton 5 Decrea sing temp erature b utton 6 LCD d isplay 3.1 Power On B T o sta rt t he a ppliance switch the button to the ON position ( turn to th e right position ). LCD displa y th e default te ...
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Bosch Appliances 250 SXO NG - page 17
6 720 607 440 Operation inst ructions 17 Setting the water temperat ure The desire d temperature of th e hot water can be ad justed on the fron t control panel of the heater. The 250 SXO h as an electronically co ntrolled gas valve that modulates the burner inp ut in response to bot h varying hot water flow rates and/or chan ges in any incomi ng an ...
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Bosch Appliances 250 SXO NG - page 18
6 720 607 440 18 Operation i nstructions 3.3 Use of remote control accessory Fig. 23 Remote control The wi reless re mote cont rol accessory and the temperature sel ector buttons on the front of the water heater operate iden tically. Con tact you r distri butor or CEC to order if th e remote c ontrol acce ssory is preferred. Modificat ion of the wa ...
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Bosch Appliances 250 SXO NG - page 19
6 720 607 440 Maintenance and service 19 4 Ma intenance and servic e The unit should be checked once a year by a gas technician. If repairs are nee ded, t he re pairs should be done by a gas technician To remove front cover B See instruction s to remove front co ver on page 8. Systems and parts that should be chec ked at least once a year Reference ...
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Bosch Appliances 250 SXO NG - page 20
6 720 607 440 20 Troubleshoot ing Test by following 4th bullet under BURN ERS DO NOT IGNITE WHEN HOT WATER IS TURNED ON. LOW WAT ER FLOW/PRESSU RE • Too many hot wa ter app lications are b eing used simultaneousl y or too much flow is being demande d The 250 S XO will effecti vely su pport two 2.0 -2.5 gpm shower heads simultaneo usly or multiple ...
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Bosch Appliances 250 SXO NG - page 21
6 720 607 440 Troubleshooti ng 21 Display Cause Solution E9 Temperature limiter opened circuit (overheat). Trips at 220F (104C). Check connections. * Check heat exchanger condition.* EA No ionization d uring safety time (safety ti me out). Note: appliance makes 3 ignition attempts before entering error mode “EA”. Check gas press ure. (see chapt ...
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Bosch Appliances 250 SXO NG - page 22
6 720 607 440 22 Electrical dia gram 6 Electr ical dia gram Fig. 29 Electrical scheme 1 Intlet wa ter temp erature se nsor 2 Ionizat ion senso r 3 Water flow sen sor 4 Over h eat protec tion 5 Tempe rature lim iter 6 Gas v alve 7 Fan 8 Water valve 9 AC Pl ug 10 Ignition electrod e 11 Displa y PCB 12 ON/O FF switch 13 Fuse T 2,5A 14 Fuse T 3,15A 15 ...
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Bosch Appliances 250 SXO NG - page 23
6 720 607 440 250 SXO Fu nctional schem e 23 7 250 SXO Fun ctional sch eme Fig. 31 Functional scheme ...
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Bosch Appliances 250 SXO NG - page 24
6 720 607 440 24 Interior co mponents diagram and parts list 8 Interio r comp onents di agram a nd parts l ist 8.1 Interior components Fig. 32 Components 1 Cover 2 On/Off s witch 3 Reset button 4 LCD d isplay 5 Program button 6 Tempe rature bu ttons 7 Flue gas collecto r 8 Mixer 9 Heat exc hanger 10 Observa tion windo w 11 Inlet a ir duct 12 Contro ...
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Bosch Appliances 250 SXO NG - page 25
6 720 607 440 Interior compon ents diagram and parts list 25 8.2 Components diagram Fig. 34 Components Dia gram ...
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Bosch Appliances 250 SXO NG - page 26
6 720 607 440 26 Interior co mponents diagram and parts list 8.3 Parts list Item Description Reference 1 Front cover 8 7 05 42 1 9 1 5 2 Shield 8 7 05 506 753 3 Heat exc hanger 8 7 05 406 28 5 4 Heat exc hanger top gasket 8 7 04 7 0 1 052 5 Clip 8 7 1 6 1 02 60 7 6 Heat exc hanger bottom gasket 8 7 04 7 0 1 054 7 O-ring 8 7 0 0 205 1 4 7 8 Temperat ...
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Bosch Appliances 250 SXO NG - page 27
6 720 607 440 Special ad justment for mea suring and adju sting CO2 levels 27 9 Spec ial adjus tment for measur ing and adjusting CO 2 levels The CO 2 can only be a djusted by a cert ified gas technician with a calibrated CO 2 analyzer. Static Gas Pressure: “ WC P1 Operati ng Pressure: “ WC The P1 minimum op erating pres sure is 5" WC for ...
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Bosch Appliances 250 SXO NG - page 28
6 720 607 440 28 Special adjust ment for mea suring and adjustin g CO2 levels D. Returnin g to Service: 1. Return slot ted cover to original position. 2. Reinstall Torx cover. 3. R emove CO 2 analyzer probe and reinstall plug in exhaust collar. 4. Turn ON/OF F switc h to the OFF (O) posi tion a nd then back to the ON (I) position . 5. Heater is rea ...
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Bosch Appliances 250 SXO NG - page 29
6 720 607 440 Protecting t he environment 29 10 P rotecting the envi ronment Packing The packing box may be fully re cycled as confirmed by the recyclin g symbol . Componen ts Many parts in th e heater can be fully recycled in the end of the product life. Contact your city authorities for information a bout the disposal of recyclable produ cts. Sav ...
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Bosch Appliances 250 SXO NG - page 30
6 720 607 440 30 Twelve Year Limited Warrant y 11 Twe lve Yea r Limited Warranty General Aquastar water he aters are w arranted b y the Manufacturer (BOSCH) through Contro lled Energy Corp. Controlled Energy Corp. (CEC) will furnish a replacement he at exchanger and will furnish a replacement of any oth er par t which fails in n ormal u se and serv ...
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Bosch Appliances 250 SXO NG - page 31
R e c yc l ed pape r I n s t a l l e r C h e c k l i s t , t o b e p e r f o r m e d b y i n s t a l l e r u p o n i n s t a l l a t i o n S e ri al N u m be r ___ ___ ___ ___ _ __ _ __ __ _ _ __ ( 8 digit s erial nu m be r is loc a t ed on ra t in g plate on righ t s ide panel) G a s P res s u r e R e a di ng * S tat ic ____ ______ O perat in g __ ...
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