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Bosch Appliances 250SX NG - page 1
MOD EL 2 50S X N G a nd 2 50SX L P T emperature Modulat ed wit h Elect ronic Ignition Suit able for heating pot able wat er only Not approved for space heat ing purpose s (Intende d for varia ble flow applicatio ns with multipl e tapping poin ts) 250 SX NG 250 SX LP 6 720 607 057 US (04.10) A L Warning : I f t h e i n f o r m a t i o n i n t h i s ...
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Bosch Appliances 250SX NG - page 2
6 720 607 057 2 Index Index 1W a r n i n g 2 2 Appliance details 4 2.1 Features 4 2.2 250 SX Specif ications (Tech nical data ) 4 2.3 Dimensions an d Minimum installation clearances 6 2.4 Genera l rules to follow for safe op eration 7 2.5 Proper location for installing your heater 7 2.6 Cle arances 8 2.7 Mounting installation 8 2.8 Combustion air r ...
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Bosch Appliances 250SX NG - page 3
6 720 607 057 Warning 3 What t o do i f you s mell gas • Clos e gas val ve. Open windows. • Do not tr y to light any ap pliance. • Do n ot touch any e lectrical s witch; do not us e any phone in your bu ilding . • I mm ed ia te ly c al l y ou r g as su pp l ie r f ro m a ne ig hb o r’ s phone. F ollow th e gas su pplier’s in structions ...
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Bosch Appliances 250SX NG - page 4
6 720 607 057 4 Applia nce deta ils 2 Applianc e details 2.1 Featur es Parts • Tou ch Pad i nterfa ce contro l • High power pre-mix compact burner with low Nox emissions • Modulating Gas Valve with constant gas:a ir ratio contr ol • Modulating water valve for improved c omfort and tempe rature contro l. Safet y • Flame sensor (ioniza tion ...
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Bosch Appliances 250SX NG - page 5
6 720 607 057 App lianc e de tails 5 • Minim um recomme nded wate r pressure : 30 PSI (2.07 bar) • Connecti ons: – Bottom of heater Comb ust ion •N O x ≤ 55 ppm •C O ≤ 250 ppm •C O 2 level set from fa ctory, see ch apter 9.1. Dimens ions • Dep th (in): 8 ½” (2 20 mm) • Width (in): 15 ¾” (400 mm) • Heigh t (in ): 23 ½” ...
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Bosch Appliances 250SX NG - page 6
6 720 607 057 6 Applia nce deta ils 2.3 Dimension s and Minimum in stallation clear ances Fig. 5 Dimension s 1 Cover 2 On/Off switch 3 Rese t butto n 4 LCD di splay 5 Program bu tton 6 Temperature buttons Fig. 6 M inimum clearances Model 250 SX TOP (A) 12” FRONT (B) 4” BACK 0” SIDES 4” FLOOR (C ) 12” VENT DIAMETER 3” Table 1 M inimum cl ...
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Bosch Appliances 250SX NG - page 7
6 720 607 057 App lianc e de tails 7 2 . 4 G e n e r a l r u l e s t o f o l l o w f o r s a f e operatio n B 1. You should follow these instr uctions when you instal l your hea ter. In the Un ited States: The i n s t a l l a t i o n m u s t c o n f o r m w i t h l o c a l co d e s o r , i n th e absence of local codes, the National Fuel Gas Code A ...
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Bosch Appliances 250SX NG - page 8
6 720 607 057 8 Applia nce deta ils 2.6 Cleara nces The 250 S X is design certified for i nstallation on a combus tible w all (see 2 .7 M ounting ins tallation) provid ed the floor cover ing bel ow the heate r is noncom bustible. For installat ions in an alcove or closet, mainta in the minimum c learances to combustible a nd non-c ombustible materi ...
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Bosch Appliances 250SX NG - page 9
6 720 607 057 App lianc e de tails 9 – b) In unconfi ned spaces in bu ildings o f convent ional frame, mas onry, or metal const ructio n, infilt rati on air is normal ly adequate to provide air for combustion. • App liances located in confi ned spac es: The confi ned sp ace m ust be pro vided with tw o permanent ope nings, one commen cing withi ...
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Bosch Appliances 250SX NG - page 10
6 720 607 057 10 Applia nce deta ils The maximum flue gas exhaust temperature on the 250 SX is 437°F (225° C) Venting Optio ns Exhaust vent diameter and material * Exhaust ven t max imum length * Ex haust vent minimum length Comb ust ion air pipe diameter and ma terial Combustion air pipe maxi mum length Vent pipe clearances with in an unenclosed ...
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Bosch Appliances 250SX NG - page 11
6 720 607 057 App lianc e de tails 11 The applia nce s hould be locat ed as close to the poi nt of terminati on as possibl e. The maxi mum v ent length is 26 feet ( 8 m) with one 90 degr ee elbow. Subtra ct 2 ½ feet from the total vent length for each additiona l 90° elbow used (a maxi mum o f th ree 9 0° el bows are permit ted in the to tal ven ...
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Bosch Appliances 250SX NG - page 12
6 720 607 057 12 Applia nce deta ils Room s ealed installa tion (TWIN PIPE SYSTEM) Fig. 12 Combus tion air pip e: ≤ 26 ft (8 m ) Exha ust ve nt pipe : ≤ 26 f t (8 m ) I f t h e t o t a l h o r iz o n t a l e x h a u s t v e n t l e n g t h i n a s i d e w a l l installa tion is gr eater than o r equal to 5 f eet (1.5 m), a condens ate drain tub ...
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Bosch Appliances 250SX NG - page 13
6 720 607 057 App lianc e de tails 13 Recomm ended exh aust vent t erminator pos ition Fig. 16 * Subject to local c odes and anticipated sn ow level ** Other equipment t hat operate s with a me chanical ai r inlet may require grea ter dista nces, refere nce manufact urer's instruc tio ns Ref. Description Minimum distance A Directly below an op ...
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Bosch Appliances 250SX NG - page 14
6 720 607 057 14 Applia nce deta ils Supportin g the exha ust vent sys tem and th e use of an external condensate trap Extern al cond ensate tr aps B A condensat e trap must be used in any sidewall exha ust vent in stallatio ns when the tota l vent len gth is ≥ 5 ft (1.5 m) OR the vent pipe pa sses thr ough an u n h e a t e d s p a c e ( b e l o ...
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Bosch Appliances 250SX NG - page 15
6 720 607 057 App lianc e de tails 15 A co ndensate drai n tu be must be attach ed to t he exhau st collar of t he heater for any vertica lly e xhaust ed vents, see p age 14. Fig. 20 Vertical venting inst allation - Masonry Chimney (combusti on air piping not being shown) A co ndensate drai n tu be must be attach ed to t he exhau st collar of t he ...
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Bosch Appliances 250SX NG - page 16
6 720 607 057 16 Applia nce deta ils FOR NA TU RAL GAS Maximu m Capacity of pipe i n Cubic Feet of Gas per Hour for Gas Pres sure of 0.5 Psig or less and a Pressure dr op of 0. 3 in Water Col umn (0 .75mbar ).(Bas ed on a 0 .60 Speci fic Grav ity G as) Btu number s given i n thou sands. Fig. 22 Follow boxed number s for pipin g just one 250 SX (exa ...
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Bosch Appliances 250SX NG - page 17
6 720 607 057 App lianc e de tails 17 2.11 Gas line sizing B It is strongl y recomme nded that the Natu ral Gas pipe be B lack Iron pipe th e entire dista nce from the outside met er to the inlet of th e gas connecti on. ¾” B l a c k I r o n p i p e u p t o 2 0 f e e t ( 6 . 1 m ) a n d 1 ” B l a c k I r o n pipe up to 70 feet (21.34m) distanc ...
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Bosch Appliances 250SX NG - page 18
6 720 607 057 18 Applia nce deta ils 2.13 Water con nections W h e n f a c i n g t h e h e a t e r , t h e ¾ ” c o l d w a t e r i n l e t i s o n t h e b o t to m r ig h t a n d th e h o t wa t e r o u t l e t i s o n t h e b o t t o m left . Instal l the heater centra lly in the build ing if possibl e and ma ke hot wa ter p iping ru ns as sh o ...
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Bosch Appliances 250SX NG - page 19
6 720 607 057 App lianc e de tails 19 2.14 Ele ctrical connections The 250 SX requires an ele ctrical p ower su pply from a 120VAC 60Hz ci rcuit and mu st be p roperly grounde d. A means f or switch ing of f the 120VAC power supply must be provided. The heate r is wired as shown in the wiring diag ram (chapter 6, Fi g. 36). 2.15 Operat ing instruct ...
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Bosch Appliances 250SX NG - page 20
6 720 607 057 20 Applia nce deta ils When the heater is i n operat ion you will hear its power vent fan a nd burne r operatin g. Upo n turning off the h ot water flow the power v ent fan w ill cont inue to op erate for up to 60 seconds to exha ust all flue ga ses. Th e power vents fan s peed is va riable dep ending on the rat e of ho t water used a ...
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Bosch Appliances 250SX NG - page 21
6 720 607 057 Operat ion instructi ons 21 3 Operation in structions Fig. 26 1 On/O ff switch 2 Reset butt on 3 Progr am Key 4 Increasing temperat ure selecto r 5 Decreasing temperat ure selecto r 6 LCD displ ay 3.1 Power On B T o sta rt the a ppliance switch the bu tton to pos ition ( I ). LCD displa y the default t emperature - t emperature facto ...
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Bosch Appliances 250SX NG - page 22
6 720 607 057 22 Operat ion in stru ctions Setti ng th e wat er tem perat ure The desired t emperat ure o f the hot wat er can be adju sted on the front control panel of the heate r. The 250 SX has an el ectronically controlle d gas valv e that modu lates the burne r input in r esponse to b oth varying hot wat er flo w rates and/or cha nges in a ny ...
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Bosch Appliances 250SX NG - page 23
6 720 607 057 Operat ion instructi ons 23 3.3 Use of remote contro l accessory Fig. 30 R emote control The wireless remot e cont rol a ccessory and the tempera ture sel ector b uttons o n th e front o f the wa ter heate r operate i dentica lly. Cont act your distri butor or CEC to o rder if the remote control acces sory is prefer red. Mo dification ...
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Bosch Appliances 250SX NG - page 24
6 720 607 057 24 Maint enance a nd se rvice 4 Maintenance and service The unit shoul d be checked o nce a year by a gas technic ian. If re pairs are needed, the repairs sho uld be done b y a gas technicia n To r emove front cov er B R e m o v e p l a s t i c d e c a l s o n f r o n t p a n e l ( P a g e 5 , F i g . 4). B Lo os en th e t wo Ph il ip ...
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Bosch Appliances 250SX NG - page 25
6 720 607 057 Troubleshooting 25 Test by following 4th bullet under BURNERS DO NOT IGNITE WHEN HOT WATER IS TURNED O N. LOW WATER FLOW/PRESSURE • T o o m a n y h o t w a t e r a p p l i c a t i o n s a r e b e i n g us ed si mul ta ne ous ly or too mu ch flo w i s b ei ng demande d The 250 SX will effect ively sup port two 2.0 -2.5 gpm shower hea ...
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Bosch Appliances 250SX NG - page 26
6 720 607 057 26 Troubleshooting Display Cause Solution E9 Temperature limiter opened circuit (overheat). Trips at 220F ( 104C). Check connections.* Check heat exchanger condition.* EA No i onization during safety t ime (safety time out) . Note: appliance makes 3 ignition attempts before entering error mode “EA”. Check gas pressure.* Check that ...
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Bosch Appliances 250SX NG - page 27
6 720 607 057 Electr ical di agram 27 6 Electrical d iagram Fig. 36 Electrical scheme 1 Intlet water temp erature sensor 2 Ioniz ation s ensor 3 Water flow sensor 4 Over heat protect ion 5 Temperature limiter 6 Gas v alv e 7 Fan 8 Water valve 9 AC Plug 10 Ignit ion ele ctrode 11 Dis pla y P CB 12 ON/OFF switch 13 Fuse T 2,5A 14 Fuse T 3,15A 15 Ter ...
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Bosch Appliances 250SX NG - page 28
6 720 607 057 28 250 SX Functiona l scheme 7 250 SX Functional s cheme Fig. 37 Func tional scheme ...
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Bosch Appliances 250SX NG - page 29
6 720 607 057 Inte rior comp onent s dia gram a nd par ts li st 29 8 Interior components diagram and parts list 8.1 Interi or componen ts Fig. 38 C omponents 1 Cover 2 On/O ff switch 3 Reset butt on 4 LCD displ ay 5 Program b u tton 6 Temperature sw itches 7 Flue gas c ollector 8 Mi xer 9 Heat exchang er 10 Obs er vat ion win dow 11 Inle t air duc ...
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Bosch Appliances 250SX NG - page 30
6 720 607 057 30 Inte rior com ponent s diagr am an d parts lis t 8.2 Comp onents diagram Fig. 40 Comp onents Diagram ...
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Bosch Appliances 250SX NG - page 31
6 720 607 057 Inte rior comp onent s dia gram a nd par ts li st 31 8.3 Parts list Item Descri ption Ref erence 1 Front cover 8 705 42 1 83 7 2 Shield 8 7 05 506 66 1 3 Heat exc hanger 8 7 05 406 285 4 Heat exc hanger top gasket 8 7 04 7 0 1 052 5 Clip 8 7 1 6 1 02 607 6 Heat exc hanger bottom ga sket 8 7 04 7 0 1 054 7 O-ring 8 700 205 1 4 7 8 Temp ...
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Bosch Appliances 250SX NG - page 32
6 720 607 057 32 Specia l adjustm ent for mea suring and adjusting CO2 level s 9 Special adj ustment for measuring and adjus ting CO 2 levels The CO 2 can only be adjusted by a certi fied gas techni cian wit h a cali brated CO 2 ana lyzer. 9.1 Adjust ing the unit Fact ory settings of this applian ce are listed in table 7. Further ad justment is onl ...
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Bosch Appliances 250SX NG - page 33
6 720 607 057 Specia l adjustmen t for measuring and ad justing CO2 lev els 33 Fig. 43 Adjusting Leave “Pr ogram” mode B Turn ON/OFF switch in positi on OFF and then ON again . i NOTE: turn ing screw clockwise decreases CO 2 lev el, tur ning coun tercl ockwis e inc reases it. Caution: Faulty ignition or noisy operation ma y occur if CO 2 levels ...
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Bosch Appliances 250SX NG - page 34
6 720 607 057 34 Protect ing the environme nt 10 Protect ing the envir onment Packin g Th e pa ck ing b ox may be ful ly rec yc le d as co nfi rme d by the rec ycling symbol . Component s Many parts in the heater can be full y recycle d in the end o f t h e p r o d u c t l i f e . C o n t a c t y o u r c i t y a u t h o r i t i e s f o r inform ati ...
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Bosch Appliances 250SX NG - page 35
6 720 607 057 Twel ve Year L imited Wa rranty 35 11 Twelve Year Limited Warranty Gene ral Aquasta r wate r heaters are warra nted by the Manufa cturer (BOSCH) through Cont rolle d Energy Corp. Contro lled Energy Corp. (CEC) will furnish a repla cement heat exchan ger and will furn ish a repla cement of any other par t which fa ils in nor mal use an ...
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Bosch Appliances 250SX NG - page 36
Replacemen t Parts available from North American Distributo r CONT RO L LED E NE RG Y CORP . 340 Mad Ri ver Park W aitsf ield, V er mont 0567 3 Phone 800-642- 3 1 1 1 Fax (802) 496-6924 www .cont rolledenergy.com/tech tec hsupport@controll edenergy .com VU L C ANO T ermodoméstic os S.A. Estra da de Cacia 380 1 - 856 Av eiro - PORTUGAL Recyc led pa ...
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