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Bosch 250 SXO LP - page 1
MO DE L 25 0 SX O - OUTD OO R MO D E L For exterior use only Elec t roni c Ignitio n and built in Freez e pr ote c tio n Suit able for hea t ing pot able wat er only Not appr oved for spac e heat i ng purpos es 250 S XO NG - Na tural G as 250 S XO LP - L iquefied Petroleum (LP) G as 6 720 607 440 U S (05.03 ) JS Warning: If the informatio n in thi ...
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Bosch 250 SXO LP - 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 250 SXO LP - page 3
6 720 607 440 Warning 3 What to do if you smell gas • Close gas valve . • Do not try to lig ht any appliance. • Do not touch any e lectrical switch; d o not use any phone in your bui lding. • Immediately call your gas suppli er fro m a neig hbor’s phone. Follow th e gas supplier’s ins tructions. • If you cannot reach your g as suppl i ...
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Bosch 250 SXO LP - page 4
6 720 607 440 4 Appliance de tails 2 Applia nce deta ils 2.1 Features Parts • Touch Pad interfac e control • High po wer p re-mix com pact burne r with low NOx emissions • Modulating Gas Valve with con stant gas: air ratio control • Modulating water valve for i mproved comfort and temperature control • Freeze protection. Safety • Flame ...
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Bosch 250 SXO LP - page 5
6 720 607 440 Appliance detai ls 5 Combustion • NOx ≤ 55 ppm • CO ≤ 250 ppm. Dimensio ns • Depth (in): 8 ½” (2 20 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 250 SXO LP - 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 Minimum clearances ...
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Bosch 250 SXO LP - page 7
6 720 607 440 Appliance detai ls 7 2.4 General rule s to f ollow for sa fe operation B 1. You should follow these instructions wh en you install your heater. In the United States: The installation must conform with loca l codes or, in t he absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54. In C anada: The In stallation should c ...
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Bosch 250 SXO LP - page 8
6 720 607 440 8 Appliance de tails 2.6 Heater Placement and Clearances The 250 S XO is design ce rtified for ins tallation directly on a combu stible wall . (see 2.7 Mount ing installatio n) For installat ion o n vinyl s iding see Fig . 10. Keep the area below the heate r free of combus tible material. Minimum clea rances If the appliance is instal ...
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Bosch 250 SXO LP - page 9
6 720 607 440 Appliance detai ls 9 B After i nspection, replace front cover and tighten screws, then repla ce plastic decal s hields. B Fix the top vent cap on the top of t he heater, as shown i n Fig. 8). Make sure th e vent cap is well f itted by taking spe cial care that t he front cov er stays inside the extended corners of the v ent cap, as sh ...
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Bosch 250 SXO LP - page 10
6 720 607 440 10 Appliance de tails 2.8 Gas piping & connections Before connecting the gas supply, check the rating plate on the right side of the hea ter to be s ure that the heater is rated for the same gas to which it w ill be connected. In the United States: The installation must conform with local codes o r, in the ab sence of local codes, ...
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Bosch 250 SXO LP - 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 (0.75mba r).(Based on a 0.60 Specific Gravity Ga s) Btu number s given in thousands. Fig. 12 Follow boxed numbers for piping jus t one 250 SXO (example : ¾ ...
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Bosch 250 SXO LP - 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 cover and locat e i nlet g as pressure measuring point (see Fig. 14). B Loosen s crew inside test poi nt fitting ( do not re move) and conne ct manometer tube on test point. 2.9.2 Static Press ure Test B Turn gas sup ply back on ...
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Bosch 250 SXO LP - page 13
6 720 607 440 Appliance detai ls 13 2.10 Wat er 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 i f possible, and make h ot water piping runs as short a s possible. Fig. 15 B THE USE OF A ...
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Bosch 250 SXO LP - page 14
6 720 607 440 14 Appliance de tails 2.11 E lectrical connections The 250 SXO requires a n electrical 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 heater is wired a s shown in the wiring diagra m (chapter 6, Fig. 29). Fig. 17 2.12 Operating instruc ...
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Bosch 250 SXO LP - page 15
6 720 607 440 Appliance detai ls 15 2.13 F or your safety read before operating your water heater A. This appliance is equip ped with electron ic ignition for lighting the mai n burners. When turning th e heat er on, follow these in structions exactly. B. Before ope rating the unit, turn t he On/Off switch to the right posi tion. WH A T TO DO I F Y ...
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Bosch 250 SXO LP - page 16
6 720 607 440 16 Operation inst ructions 3 Opera tion inst ructions Fig. 19 1 On/Off s witch 2 Reset button 3 Program button 4 Increas ing tempera ture bu tton 5 Decrea sing temp erature b utton 6 LCD d isplay 3.1 Power On B T o start t he a ppliance switch th e b utton to the ON position ( turn to th e right position ). LCD displa y th e default t ...
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Bosch 250 SXO LP - page 17
6 720 607 440 Operation inst ructions 17 Setting the wa ter temperature The desired te mperature of the hot water can be adju sted on the front control panel of the he ater. The 250 SXO h as an electronically cont rolled gas valve that modulates the burner inp ut in response to both v arying hot water flow rates and/or chan ges in any incomi ng and ...
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Bosch 250 SXO LP - page 18
6 720 607 440 18 Operation inst ructions 3.3 Use of remote control accessory Fig. 23 Remote control The wi reless re mote cont rol accessory and the temperature select or buttons on the front of the water heater operate identic ally. Con tact you r distrib utor or CEC to order if th e remote c ontrol acce ssory is preferred. Modification of the wat ...
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Bosch 250 SXO LP - page 19
6 720 607 440 Maintenance a nd service 19 4 Mai ntenance a nd 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 fr ont cover B See instruction s to remove front cove r on page 8. Systems and parts that should be checke d at least once a year Refere ...
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Bosch 250 SXO LP - page 20
6 720 607 440 20 Troubleshoot ing Test by foll owing 4th bullet under B URNERS DO NOT IGNITE WHEN HOT WATER IS TURNED ON. LOW WATER FLOW/PRESSUR E • Too many ho t wate r applicat ions are being used simultaneously or too much flow is being demande d The 250 SXO will effectively support two 2.0-2.5 gpm shower heads simultaneousl y or multiple sink ...
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Bosch 250 SXO LP - 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 duri ng safety time ( safety ti me out). Note: appliance makes 3 ignition attempts before entering error mode “EA”. Check gas pressu re. (see chap ...
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Bosch 250 SXO LP - page 22
6 720 607 440 22 Electrical dia gram 6 Electri cal dia gram Fig. 29 Electrical scheme 1 Intlet wa ter temp erature se nsor 2 Ionizat ion sensor 3 Water flow sens or 4 Over h eat protec tion 5 Tempe rature lim iter 6 Gas val ve 7 Fan 8 Water valve 9 AC Plug 10 Ignition electrod e 11 Display PCB 12 ON/OF F switch 13 Fuse T 2,5A 14 Fuse T 3,15A 15 Ter ...
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Bosch 250 SXO LP - page 23
6 720 607 440 250 SXO Fu nctional scheme 23 7 250 S XO Fun ctional sch eme Fig. 31 Functional scheme ...
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Bosch 250 SXO LP - page 24
6 720 607 440 24 Interior compon ents diagram and parts list 8 Interio r comp onents di agram a nd parts li st 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 250 SXO LP - page 25
6 720 607 440 Interior compon ents diagram and parts list 25 8.2 Components diagram Fig. 34 Components Diagra m ...
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Bosch 250 SXO LP - page 26
6 720 607 440 26 Interior compon ents 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 exch anger 8 7 05 406 28 5 4 Heat exch anger top gasket 8 7 04 7 0 1 052 5 Clip 8 7 1 6 1 02 60 7 6 Heat exch anger 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 250 SXO LP - page 27
6 720 607 440 Special ad justment for measu ring and adjusti ng CO2 levels 27 9 Spec ial adjus tment for measur ing and a djusting 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 press ure is 5" W C fo ...
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Bosch 250 SXO LP - page 28
6 720 607 440 28 Special adjust ment for measur ing 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 a nalyzer p robe a nd reinstall plu g i n exhaust collar. 4. Turn ON/OFF sw itch to t he O FF (O) posi tion a nd then back to the ON (I) position. 5. Heater i ...
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Bosch 250 SXO LP - page 29
6 720 607 440 Protecting the environment 29 10 Pr otecting the envir onment Packing The p acking 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 ab out the disposal of recyclable produ cts. Sav ...
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Bosch 250 SXO LP - page 30
6 720 607 440 30 Twelve Year Limited Warrant y 11 Twe lve Yea r Limited Warranty General Aquastar w ater heat ers are w arranted by the Manufacturer (BOSCH) through Controlle d Energy Corp. Controlled Energy Corp. (CEC) will furnish a replacement he at exchanger and will furnish a replacement of any oth er part which fails in n ormal u se and servi ...
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Bosch 250 SXO LP - page 31
R e c yc led pa per 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 mber is loc a t ed on ra ti n g plate on right s ide pa nel ) G as P re s s ure R e a di ng * S tat ic ______ ____ O pe rati n g _____ ...
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