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Bosch AQUA STAR 250SX LP - page 1
MOD EL 2 50S X N G a n d 2 50S X 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 purposes (Intende d for variable flow applicatio ns with multipl e tapping poin ts) 250 SX NG 250 SX LP 6 720 607 057 (04.05) J S Warning : I f t h e i n f o r m a t i o n i n t h i s m a ...
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Bosch AQUA STAR 250SX LP - 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 and Minimu m installation clearances 6 2.4 General rules to follow for safe operation 7 2.5 Proper location for installing your heater 7 2.6 Cle arances 8 2.7 Mounting installation 8 2.8 Combustion air requ ...
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Bosch AQUA STAR 250SX LP - 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 an y appli ance. • Do n ot touch any e lectrical sw itch; do not use any phone in your bu ilding. • I m m e d ia t e l y c a l l y ou r g a s su p p l ie r f r o m a n e i g h bo r ’ s phone. F ollow th e gas su pplier’s in s ...
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Bosch AQUA STAR 250SX LP - page 4
6 720 607 057 4 Applia nce details 2 Applianc e details 2.1 Featur es Parts • Touch Pad i nterfa ce co ntrol • High power pre-mix compact burner wit h lo w Nox emissions • Modulating Gas Valve with constant gas:a ir ratio contr ol • Modulating water v alve for improved c omfort and tempe rature contro l. Safet y • Flame s ensor (ioniza ti ...
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Bosch AQUA STAR 250SX LP - page 5
6 720 607 057 App lianc e deta ils 5 • Minim um rec ommended wate r pr essure: 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 factory , see cha pter 9. 1. Dimens ions • Depth (in): 8 ½” (2 20 mm) • Width (in): 15 ¾” (400 mm) • Heigh t (in ): 23 ½” ...
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Bosch AQUA STAR 250SX LP - page 6
6 720 607 057 6 Applia nce details 2.3 Dimension s and Minimum in stallation clearances 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 clear ...
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Bosch AQUA STAR 250SX LP - page 7
6 720 607 057 App lianc e deta ils 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 f ollow the se instruc tions wh en 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 lo c a l c o d e s o r , i n t h e absence of local codes, the National Fuel Gas Co ...
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Bosch AQUA STAR 250SX LP - page 8
6 720 607 057 8 Applia nce details 2.6 Cleara nces The 250 SX i s desi gn cert ified f or installat ion on a combus tible wa ll (see 2.7 Mounting installatio n) 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 comb ustible and non-co mbustible materi ...
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Bosch AQUA STAR 250SX LP - page 9
6 720 607 057 App lianc e deta ils 9 – b) In uncon fined spac es in buildi ngs of convent ional fra me, ma sonry, or metal const ructi on, in filtr ation air is no rmally adequ ate to provide air for combu stion. • App liances located in confi ned spac es: The confined space must be provid ed wit h two perman ent open ings, on e commenci ng wit ...
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Bosch AQUA STAR 250SX LP - page 10
6 720 607 057 10 Applia nce details 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 maximum length * Exhaust vent minimum length Comb usti on air pipe diameter and ma terial Combustion air pipe maxi mum length Vent pipe clearances with in an unenclosed spa ...
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Bosch AQUA STAR 250SX LP - page 11
6 720 607 057 App lianc e deta ils 11 The appliance should b e located as c lose to the poi nt of terminati on as possib le. The maximum vent length is 26 feet (8 m) with one 90 degree elbow. Sub tract 2½ feet f rom the tot al vent length for each additional 90° elbow used (a maximum o f three 9 0° elb ows are pe r m i t te d in th e t ot a l ve ...
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Bosch AQUA STAR 250SX LP - page 12
6 720 607 057 12 Applia nce details Room sea led installa tion (TWIN P IPE SYSTEM) Fig. 12 Combus tion air pip e: ≤ 26 ft (8 m ) Exha ust ve nt p ipe: ≤ 26 ft ( 8 m) I f t h e t o t a l h o r i z 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 greater than or equal to 5 feet (1.5m), a condens ate drain tube mu ...
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Bosch AQUA STAR 250SX LP - page 13
6 720 607 057 App lianc e deta ils 13 Recomm ended exh aust vent t erminator pos ition Fig. 16 * Subject to local c odes and anticipated sn ow level ** Other equip ment that operate s with a mechanic al air inlet may req uire greater dista nces, refere nce manufacture r's instructio ns Ref. Description Minimum distance A Directly below an open ...
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Bosch AQUA STAR 250SX LP - page 14
6 720 607 057 14 Applia nce details Supportin g the exha ust vent sys tem and the use of an external con densate trap Extern al cond ensate tr aps B A condens ate trap must be used in any sidewa ll exha ust vent instal lations when the tota l vent length 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 w ...
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Bosch AQUA STAR 250SX LP - page 15
6 720 607 057 App lianc e deta ils 15 A cond ensate drai n tube must be attach ed to the exhau st collar of the heater for any vert icall y exhaus ted vents, see page 1 4. Fig. 20 Vertical venting inst allation - Masonry Chimney (combusti on air piping not being shown) A cond ensate drai n tube must be attach ed to the exhau st collar of the heater ...
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Bosch AQUA STAR 250SX LP - page 16
6 720 607 057 16 Applia nce details FOR NA TU RAL GAS Maxi mum Cap acity o f pip e in Cubi c Fee t of Gas per H our for Gas Pr essure of 0.5 Psig or less and a P ressure drop of 0. 3 in Wat er Col umn (0 .75mbar ).(Bas ed on a 0 .60 S pecifi c Gravi ty Gas) Btu n umbers gi ven in thous ands. Fig. 22 Fol low boxed numbers for piping just one 250 SX ...
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Bosch AQUA STAR 250SX LP - page 17
6 720 607 057 App lianc e deta ils 17 2.11 Gas line sizing B It is str ongly reco mmend ed th at t he Na tural Gas pipe be Bla ck Iron pipe the entire d istance 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) dista ...
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Bosch AQUA STAR 250SX LP - page 18
6 720 607 057 18 Applia nce details 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 t o m r i g h t a n d th e h o t w a t e r o u t l e t i s o n t h e b o t t o m left. Inst all the heater ce ntrally in the bu ilding if possibl e and ma ke hot wa ter pip ing ru ns as sh ...
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Bosch AQUA STAR 250SX LP - page 19
6 720 607 057 App lianc e deta ils 19 2.14 Elec trical connections The 250 SX requires an ele ctrical p ower su pply from a 120VAC 60Hz ci rcuit and mu st be p roper ly gr ounded. A means f or switch ing off the 120VA C power supply must be provided. The hea ter is wired as shown in th e wirin g diagr am (chapter 6, Fig. 36). 2.15 Operat ing instru ...
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Bosch AQUA STAR 250SX LP - page 20
6 720 607 057 20 Applia nce details When the heater is i n operat ion you will hear its power vent fan a nd burne r operatin g. Upon turning off the h ot water flow t he power vent fan will continu e to operate f o r u p t o 6 0 s e c o n d s t o e x h a u s t a l l f l u e g a s e s . T h e power vents fan speed is variable depend ing on th e rat ...
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Bosch AQUA STAR 250SX LP - page 21
6 720 607 057 Operat ion instructi ons 21 3 Operation in structions Fig. 26 1 On/Off swit ch 2 Reset butto n 3 Program Key 4 Increasing temperat ure selecto r 5 Decreasing t emperature selecto r 6 LCD displ ay 3.1 Power On B T o start the ap pliance swit ch the button to positi on ( I ). LCD displa y the default t emperature - t emperature factor y ...
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Bosch AQUA STAR 250SX LP - page 22
6 720 607 057 22 Operat ion in structi ons Setti ng th e wat er tem perat ure The desired t emperat ure o f the ho t wat er can be adju sted on the fr ont control panel of the heater . The 250 SX has an el ectronically controlled gas valve t hat modula tes the burne r input in r esponse to bot h varying hot wat er flow rates and/or cha nges in a ny ...
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Bosch AQUA STAR 250SX LP - page 23
6 720 607 057 Operat ion instructi ons 23 3.3 Use of remote contro l accessory Fig. 30 Remote control The wireless remote control access ory and the temperatu re sel ector b uttons on th e front of the water heate r operate identica lly. Cont act your distributo r or CEC to order if the remote control acc essory is prefer red. Mo dification of the ...
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Bosch AQUA STAR 250SX LP - page 24
6 720 607 057 24 Maint ena nce an d ser vice 4 Maintenance and service The unit shoul d be checked once a year by a gas technic ian. If re pairs are n eeded, the repairs should 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 o s e n t h e t wo P h i ...
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Bosch AQUA STAR 250SX LP - page 25
6 720 607 057 Troubleshooting 25 Test by followin g 4th bullet unde r BURNERS DO NOT IGNITE WHEN HOT WATER IS TURNED ON. 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 sim ul 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 he ...
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Bosch AQUA STAR 250SX LP - page 26
6 720 607 057 26 Troubleshooting Display Cause Solu tion E9 Temperature limiter opened circuit (overheat). Trips at 220F (104 C). Check connections.* Check heat exchanger condition. * EA No ionization during safety time (safety t ime out). Check gas pr essure.* Check that gas is not diluted w ith air, as a result from recent gas pipel ine rework.*. ...
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Bosch AQUA STAR 250SX LP - page 27
6 720 607 057 Electr ical diag ram 27 6 Electrical d iagram Fig. 36 Elec trical scheme 1 Intlet water temp erature sensor 2 Ioniz ation se nsor 3 Water flow sensor 4 Over heat protect ion 5 Temperature l imiter 6 Gas va lv e 7 Fan 8 Water valve 9 AC Plug 10 Igniti on ele ctrode 11 Dis pla y P CB 12 ON/OFF switch 13 Fuse T 2,5A 14 Fuse T 3,15 A 15 T ...
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Bosch AQUA STAR 250SX LP - page 28
6 720 607 057 28 250 SX Functiona l scheme 7 250 SX Functional s cheme Fig. 37 Functional scheme ...
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Bosch AQUA STAR 250SX LP - page 29
6 720 607 057 Inte rior comp onent s dia gram a nd parts list 29 8 Interior components diagram and parts list 8.1 Interi or componen ts Fig. 38 Components 1 Cover 2 On/Off swit ch 3 Reset butto n 4 LCD displ ay 5 Program button 6 Temperature sw itches 7 Flue gas c ollector 8 Mix er 9 Heat e xchange r 10 Obs er vat io n wi nd ow 11 Inlet air duc t 1 ...
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Bosch AQUA STAR 250SX LP - page 30
6 720 607 057 30 Inte rior comp onent s d iagra m and par ts l ist 8.2 Comp onents diagram Fig. 40 Components Diagram ...
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Bosch AQUA STAR 250SX LP - page 31
6 720 607 057 Inte rior comp onent s dia gram a nd parts list 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 8 705 406 285 4 Heat exc hanger to p gasket 8 7 04 7 0 1 052 5 Clip 8 7 1 6 1 02 607 6 Heat exc hanger b ottom gasket 8 7 04 7 0 1 054 7 O-ring 8 700 205 1 4 7 8 Temper ...
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Bosch AQUA STAR 250SX LP - page 32
6 720 607 057 32 Specia l adjustm ent for mea suring and ad justing CO2 level s 9 Special adjus tment for measuring and adjusti ng CO 2 levels The CO 2 ca n onl y be adjuste d by a c ertif ied gas techni cian wit h a calibrat ed CO 2 anal yzer. 9.1 Adjust ing the unit Fact ory settings of thi s appl iance a re listed in ta ble 7. Further ad justmen ...
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Bosch AQUA STAR 250SX LP - page 33
6 720 607 057 Specia l adjustmen t for measuring and adju sting CO2 leve ls 33 Fig. 43 Adjust ing Leave “Pr ogram” mode B Turn ON/OFF switch in position OFF and then ON again . i NOTE: turn ing scr ew clockwise decreases CO 2 lev el, tur ning coun tercl ockwis e incr eases it. Caution: Faulty igniti on or noisy operation ma y occur if CO 2 leve ...
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Bosch AQUA STAR 250SX LP - page 34
6 720 607 057 34 Protect ing the environme nt 10 Protect ing the environment Packin g Th e pa ck i ng box ma y b e f ul ly r ec yc le d a s c on fi rme d b y the rec ycling symbol . Components Many parts i n the heater can be f ully recycle d in t he en d 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 in ...
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Bosch AQUA STAR 250SX LP - page 35
6 720 607 057 Twel ve Year L imited Wa rranty 35 11 Twelve Year Limited Warranty Gene ral Aquasta r water heaters are warrant ed by the Manufa cture r (BOSCH) throu gh Co ntrol led Energy Corp. Contro lled Energy Corp. (CEC) will furnish a replac ement heat exchanger and wi ll fu rnish a repla cemen t of any oth er part which fai ls in norma l use ...
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Bosch AQUA STAR 250SX LP - page 36
Replacement P arts available from North American Distributor CONT ROLLED EN ERG Y CORP . 340 Mad Ri ver Park W aitsfield , V ermont 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 ermodomés ticos S.A. Estra da de Cacia 380 1 - 856 A veir o - PORTUGAL Recyc led paper ...
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