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Bosch 250SX LP Manual

Temperature modulated with electronic ignition
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Temperature Modulated with Electronic Ignition
Not approved for space heating purposes
(Intended for variable flow applications with multiple tapping points)
250 SX NG
250 SX LP
Warning: If the information in this manual is not
followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
Do not store or use gasoline or other flammable
vapor and liquids in the vicinity of this or any other
appliance.
Improper
installation,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or additional information consult a
qualified installer, service agency or the gas
supplier.
In the Commonwealth of Massachusetts this
product must be installed by a licensed plumber or
gas fitter.
Upon completion of the installation, these
instructions should be handed to the user of the
appliance for future reference.
MODEL 250SX NG and 250SX LP
Suitable for heating potable water only
adjustment,
alteration,
What to do if you smell gas
• Close gas valve. Open windows.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• If you cannot reach your gas supplier, call the fire
department.
• Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.

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  Summary of Contents for Bosch 250SX LP

  • Page 1 MODEL 250SX NG and 250SX LP Temperature Modulated with Electronic Ignition Suitable for heating potable water only Not approved for space heating purposes (Intended for variable flow applications with multiple tapping points) 250 SX NG 250 SX LP Warning: If the information in this manual is not...
  • Page 2 Index Index Warning Warning Warning: If the information in this Appliance details manual is not followed exactly. A fire or Features explosion may result causing property 250 SX Specifications (Technical data) damage, personal injury or death. Dimensions and Minimum installation clearances General rules to follow for safe operation Proper location for installing your heater Clearances...
  • Page 3 Warning Warning: Field wiring connections and electrical grounding must comply with local codes, or in the absence of local codes, with the latest edition of the National Electric Code, ANSI/NFPA 70, or in Canada, all electrical wiring must comply with the local codes and the Canadian Electrical Code, CSA C22.1 Part 1.
  • Page 4: Appliance Details

    • Failure codes for easy diagnostic and repair. Accessories • Optional wireless remote control accessory to operate with the appliance • Vent termination kit. BOSCH is constantly improving its products, therefore specifications are Fig. 3 Gas pressure measuring point subject to change without prior notice.
  • Page 5 Appliance details • Minimum recommended water pressure: 30 PSI UNPACKING THE 250 SX HEATER (2.07 bar) This heater is packed securely. • Connections: The box includes: – Bottom of heater • Pressure relief valve Combustion • Bracket for wall hanging the heater •...
  • Page 6: Dimensions And Minimum Installation Clearances

    Appliance details Dimensions and Minimum installation clearances Fig. 5 Dimensions Cover On/Off switch Reset button LCD display Program button Temperature buttons Fig. 6 Minimum clearances Model 250 SX TOP (A) 12” FRONT (B) 4” BACK 0” SIDES 4” FLOOR (C) 12”...
  • Page 7: General Rules To Follow For Safe Operation

    Appliance details General rules to follow for safe Proper location for installing your operation heater B 1. You should follow these instructions when you Carefully select the location of the water heater. For install your heater. In the United States: The your safety and for proper heater operation, you must installation must conform with local codes or, in the provide combustion air to the heater and a proper...
  • Page 8: Mounting Installation

    Appliance details Clearances The 250 SX is design certified for installation on a combustible wall (see 2.7 Mounting installation) provided the floor covering below the heater is noncombustible. For installations in an alcove or closet, maintain the minimum clearances to combustible and non-combustible materials listed below.
  • Page 9 Appliance details – b) In unconfined spaces in buildings of Establish vent clearances that comply with the vent conventional frame, masonry, metal manufacturer's specifications. In all cases follow local construction, infiltration air is normally adequate to codes. See table 2. provide air for combustion.
  • Page 10 Appliance details The maximum flue gas exhaust temperature on the 250 SX is 437°F (225°C) Venting Exhaust * Exhaust * Exhaust Combustion Combustion Vent pipe Vent pipe Options vent vent vent air pipe air pipe clearances clearances diameter maximum minimum diameter maximum within an...
  • Page 11 Appliance details The appliance should be located as close to the point page 24. See error code to confirm error, correct the of termination as possible. The maximum vent length is problem and then reset the heater before operating. 26 feet (8 m) with one 90 degree elbow. Subtract 2½ Attaching the exhaust and air inlet connection feet from the total vent length for each additional 90°...
  • Page 12 Appliance details Room sealed installation (TWIN PIPE SYSTEM) Open combustion installation (SINGLE PIPE SYSTEM) Fig. 12 Combustion air pipe: ≤ 26 ft (8 m) Exhaust vent pipe: ≤ 26 ft (8 m) If the total horizontal exhaust vent length in a side wall Fig.
  • Page 13 Appliance details Recommended exhaust vent terminator position Fig. 16 Ref. Description Minimum distance Directly below an opening; operable windows, doors and any non- 36 in mechanical fresh air openings Below a gutter, sanitary pipework or eaves 24 in Below a gutter, sanitary pipework or eaves, protected by metal 12 in shielding From any internal corner...
  • Page 14 Appliance details Supporting the exhaust vent system and the use If the total horizontal exhaust vent length in a side wall of an external condensate trap installation is greater than or equal to 5 feet (1.5m), a condensate drain tube must be attached to the exhaust External condensate traps collar.
  • Page 15: Gas Piping & Connections

    Appliance details A condensate drain tube must be attached to the 2.10 Gas piping & connections exhaust collar of the heater for any vertically exhausted Before connecting the gas supply, check the rating vents, see page 14. plate on the right side of the heater to be sure that the heater is rated for the same gas to which it will be connected.
  • Page 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 drop of 0.3 in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands. Follow boxed numbers for piping just one 250 SX (example: ¾”...
  • Page 17: High Altitude Operation

    Appliance details 2.11 Gas line sizing load. Using a manometer, then measure the inlet gas pressure at the inlet gas pressure test port. See Fig. 23. B It is strongly recommended that the Natural Gas pipe Gas pressures lower than 5" W.C. for Natural Gas or be Black Iron pipe the entire distance from the 11"...
  • Page 18: Water Connections

    Appliance details 2.13 Water connections Connecting the pressure relief valve (PRV) A listed pressure relief valve supplied with the heater When facing the heater, the ¾” cold water inlet is on the must be installed at the time of installation. No valve is bottom right and the hot water outlet is on the bottom to be placed between the PRV and the heater.
  • Page 19: Electrical Connections

    Appliance details 2.14 Electrical connections 2.16 For your safety read before operating your water heater Warning: safety reasons, disconnect the power supply to the Warning: If you do not follow these heater before any service or testing is instructions exactly, a fire or explosion performed.
  • Page 20: To Turn Off Gas To Appliance

    Appliance details NOTE: on a first time initial instal- lation or after gas line work has been done, existence of air in the gas line will cause ignition delay when the hot water is turned on. This will result in an error (EA) on the units display screen.
  • Page 21: Temperature Selection

    Operation instructions Operation instructions Fig. 26 B Press buttons On/Off switch in order to reach Reset button requested temperature. Program Key Increasing temperature selector Decreasing temperature selector LCD display Power B To start the appliance switch the button to position (I).
  • Page 22 Operation instructions Setting the water temperature The desired temperature of the hot water can be adjusted on the front control panel of the heater. The 250 SX has an electronically controlled gas valve that modulates the burner input in response to both varying hot water flow rates and/or changes in any incoming and outgoing water temperatures.
  • Page 23 Operation instructions Use of remote control accessory Fig. 33 Reset button If the problem persists, contact your installer. Program button Fig. 30 Remote control Program button can be used/programmed in the The wireless remote control accessory and the appliance and in the remote control. temperature selector buttons on the front of the water heater operate identically.
  • Page 24: Maintenance And Service

    Maintenance and service Maintenance and service heater will communicate the source by these error codes. Warning: Always turn off the electrical BURNERS DO NOT IGNITE WHEN HOT WATER IS power supply, turn off the manual gas TURNED ON valve and turn off the manual water •...
  • Page 25: Noisy Burner / Heater During Operation

    Troubleshooting Test by following 4th bullet under BURNERS DO control of the heater can be lowered to produce a NOT IGNITE WHEN HOT WATER IS TURNED ON. more comfortable hot water temperature. • Inlet water pressure erratic LOW WATER FLOW/PRESSURE fluctuating supply water pressure •...
  • Page 26 Troubleshooting Display Cause Solution Temperature limiter opened circuit Check connections.* (overheat). Trips at 220F (104C). Check heat exchanger condition.* No ionization during safety time (safety time Check gas pressure.* out). Check that gas is not diluted with air, as a result from recent gas pipeline rework.*.
  • Page 27: Electrical Diagram

    Electrical diagram Electrical diagram Fig. 36 Electrical scheme Intlet water temperature sensor Ionization sensor Water flow sensor Over heat protection Temperature limiter Gas valve Water valve AC Plug Ignition electrode Display PCB ON/OFF switch Fuse T 2,5A Fuse T 3,15A Terminal block Ground post Outlet water temperature sensor...
  • Page 28 250 SX Functional scheme 250 SX Functional scheme Fig. 37 Functional scheme 6 720 607 057...
  • Page 29: Interior Components Diagram And Parts List

    Interior components diagram and parts list Interior components diagram and parts list Interior components Fig. 38 Components Cover On/Off switch Reset button LCD display Program button Temperature switches Flue gas collector Mixer Heat exchanger Observation window Inlet air duct Control unit Exhaust fan Water valve Gas valve...
  • Page 30: Components Diagram

    Interior components diagram and parts list Components diagram Fig. 40 Components Diagram 6 720 607 057...
  • Page 31: Parts List

    Interior components diagram and parts list Parts list Item Description Reference Front cover 8 705 421 837 Shield 8 705 506 661 Heat exchanger 8 705 406 285 Heat exchanger top gasket 8 704 701 052 Clip 8 716 102 607 Heat exchanger bottom gasket 8 704 701 054 O-ring...
  • Page 32: Adjusting The Unit

    Special adjustment for measuring and adjusting CO2 levels Special adjustment for measuring and adjusting CO levels The CO can only be adjusted by a certified gas adjustment at minimum gas flow (P2) - See technician with a calibrated CO analyzer. table 7.
  • Page 33 Special adjustment for measuring and adjusting CO2 levels NOTE: turning screw clockwise decreases level, turning counterclockwise increases it. Caution: Faulty ignition or noisy operation may occur if CO levels are adjusted outside the indicated range. Fig. 43 Adjusting Leave “Program” mode B Turn ON/OFF switch in position OFF and then ON again.
  • Page 34: Protecting The Environment

    Protecting the environment Protecting the environment Packing The packing box may be fully recycled as confirmed by the recycling symbol Components Many parts in the heater can be fully recycled in the end of the product life. Contact your city authorities for information about the disposal of recyclable products.
  • Page 35: Twelve Year Limited Warranty

    Service Labor Costs Aquastar water heaters are warranted by the This warranty does not cover any labor costs Manufacturer (BOSCH) through Controlled Energy associated with service, removal or re-installation of Corp. Controlled Energy Corp. (CEC) will furnish a part(s). All such costs must be borne by the Purchaser.
  • Page 36 Replacement Parts available from North American Distributor CONTROLLED ENERGY CORP. 340 Mad River Park VULCANO Termodomésticos S.A. Waitsfield, Vermont 05673 Estrada de Cacia Phone 800-642-3111 3801 - 856 Aveiro - PORTUGAL Fax (802) 496-6924 www.controlledenergy.com/tech techsupport@controlledenergy.com Recycled paper © 2004 Controlled Energy Corporation, Waitsfield, VT all rights reserved...

This manual is also suitable for:

250sx ngGwh-635-es-nGwh-635-es-l