Bosch 250SX NG - Manuals

6 720 607 057 8 Appliance details 2.6 Clearances The 250 SX is design certified for installation on acombustible wall (see 2.7 Mounting installation)provided the floor covering below the heater isnoncombustible. For installations in an alcove or closet,maintain the minimum clearances to combustible ...

6 720 607 057 Appliance details 9 – b) In unconfined spaces in buildings of conventional frame, masonry, or metal construction, infiltration air is normally adequate toprovide air for combustion. • Appliances located in confined spaces: The confined space must be provided with twopermanent openings,...

6 720 607 057 10 Appliance details The maximum flue gas exhaust temperature on the 250 SX is 437°F (225°C) Venting Options Exhaust vent diameter and material * Exhaust vent maximum length * Exhaust vent minimum length Combustion air pipe diameter and material Combustion air pipe maximum length Vent ...

6 720 607 057 Appliance details 11 The appliance should be located as close to the pointof termination as possible. The maximum vent length is26 feet (8 m) with one 90 degree elbow. Subtract 2½feet from the total vent length for each additional 90°elbow used (a maximum of three 90° elbows arepermitt...

6 720 607 057 12 Appliance details Room sealed installation (TWIN PIPE SYSTEM) Fig. 12 Combustion air pipe: ≤ 26 ft (8 m) Exhaust vent pipe: ≤ 26 ft (8 m) If the total horizontal ex haust vent length in a side wallinstallation is greater than or equal to 5 feet (1.5m), acondensate drain tube must be...

6 720 607 057 Appliance details 13 Recommended exhaust vent terminator position Fig. 16 * Subject to local codes and anticipated snow level ** Other equipment that operates with a mechanical air inlet may require greater distances, reference manufacturer's instructions Ref. Description Minimum dista...

6 720 607 057 14 Appliance details Supporting the exhaust vent system and the use of an external condensate trap External condensate traps B A condensate trap must be used in any sidewallexhaust vent installations when the total vent lengthis ≥ 5 ft (1.5 m) OR the vent pipe passes through an unheate...

6 720 607 057 Appliance details 15 A condensate drain tube must be attached to theexhaust collar of the heater for any vertically exhaustedvents, see page 14. Fig. 20 Vertical venting installation - Masonry Chimney (combustion air piping not beingshown) A condensate drain tube must be attached to th...

6 720 607 057 16 Appliance details FOR NATURAL GAS Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure dropof 0.3 in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands. Fig. 22 Follow boxed numbers for ...

6 720 607 057 Appliance details 17 2.11 Gas line sizing B It is strongly recommended that the Natural Gas pipebe Black Iron pipe the entire distance from theoutside meter to the inlet of the gas connection. ¾”Black Iron pipe up to 20 feet (6.1m) and 1” Black Ironpipe up to 70 feet (21.34m) distances...

6 720 607 057 18 Appliance details 2.13 Water connections When facing the heater, the ¾” cold water inlet is on thebottom right and the hot water outlet is on the bottomleft. Install the heater centrally in the building if possibleand make hot water piping runs as short as possible. Fig. 24 B THE US...

6 720 607 057 Appliance details 19 2.14 Electrical connections The 250 SX requires an electrical power supply from a120VAC 60Hz circuit and must be properly grounded.A means for switching off the 120VAC power supplymust be provided.The heater is wired as shown in the wiring diagram(chapter 6, Fig. 3...

6 720 607 057 20 Appliance details When the heater is in operation you will hear its powervent fan and burner operating. Upon turning off the hotwater flow the power vent fan will continue to operatefor up to 60 seconds to exhaust all flue gases. Thepower vents fan speed is variable depending on the...

6 720 607 057 Operation instructions 21 3 Operation instructions Fig. 26 1 On/Off switch 2 Reset button 3 Program Key 4 Increasing temperature selector 5 Decreasing temperature selector 6 LCD display 3.1 Power On B To start the appliance switch the button to position( I ). LCD display the default te...

6 720 607 057 Operation instructions 23 3.3 Use of remote control accessory Fig. 30 Remote control The wireless remote control accessory and thetemperature selector buttons on the front of the waterheater operate identically. Contact your distributor orCEC to order if the remote control accessory is...

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 ionization during safety time (safety time out).Note: appliance makes 3 ignition attempts before entering error mo...

6 720 607 057 Electrical diagram 27 6 Electrical diagram Fig. 36 Electrical scheme 1 Intlet water temperature sensor 2 Ionization sensor 3 Water flow sensor 4 Over heat protection 5 Temperature limiter 6 Gas valve 7 Fan 8 Water valve 9 AC Plug 10 Ignition electrode 11 Display PCB 12 ON/OFF switch 13...

6 720 607 057 28 250 SX Functional scheme 7 250 SX Functional scheme Fig. 37Functional scheme

6 720 607 057 Interior components diagram and parts list 29 8 Interior components diagram and parts list 8.1 Interior components Fig. 38 Components 1 Cover 2 On/Off switch 3 Reset button 4 LCD display 5 Program button 6 Temperature switches 7 Flue gas collector 8 Mixer 9 Heat exchanger 10 Observatio...

6 720 607 057 30 Interior components diagram and parts list 8.2 Components diagram Fig. 40 Components Diagram

6 720 607 057 Interior components diagram and parts list 31 8.3 Parts list Item Description Reference 1 Front cover 8 705 421 837 2 Shield 8 705 506 661 3 Heat exchanger 8 705 406 285 4 Heat exchanger top gasket 8 704 701 052 5 Clip 8 716 102 607 6 Heat exchanger bottom gasket 8 704 701 054 7 O-ring...

6 720 607 057 32 Special adjustment for measuring and adjusting CO2 levels 9 Special adjustment for measuring and adjusting CO 2 levels The CO 2 can only be adjusted by a certified gas technician with a calibrated CO 2 analyzer. 9.1 Adjusting the unit Factory settings of this appliance are listed in...

6 720 607 057 34 Protecting the environment 10 Protecting the environment Packing The packing box may be fully recycled as confirmed bythe recycling symbol . Components Many parts in the heater can be fully recycled in the endof the product life. Contact your city authorities forinformation about th...

6 720 607 057 Twelve Year Limited Warranty 35 11 Twelve Year Limited Warranty General Aquastar water heaters are warranted by theManufacturer (BOSCH) through Controlled EnergyCorp. Controlled Energy Corp. (CEC) will furnish areplacement heat exchanger and will furnish areplacement of any other part ...

Replacement Parts available from North American Distributor CONTROLLED ENERGY CORP. 340 Mad River Park Waitsfield, Vermont 05673 Phone 800-642-3111 Fax (802) 496-6924 www.controlledenergy.com/tech [email protected] VU LCANO Termodomésticos S.A. Estrada de Cacia 3801 - 856 Aveiro - POR...