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Bosch 250 SXO LP User Manual

Outdoor model with electronic ignition and built in freeze protection
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MODEL 250SXO - OUTDOOR MODEL
Electronic Ignition and built in Freeze protection
Not approved for space heating purposes
250 SXO NG - Natural Gas
250 SXO LP - Liquefied Petroleum (LP) Gas
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.
For exterior use only
Suitable for heating potable water only
adjustment,
alteration,
What to do if you smell gas
• Close gas valve.
• 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 250 SXO LP

  • Page 1 Suitable for heating potable water only Not approved for space heating purposes 250 SXO NG - Natural Gas 250 SXO LP - Liquefied Petroleum (LP) Gas Warning: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.

  • Page 2: Table Of Contents

    Index Warning Appliance details Features 250 SXO Specifications (Technical data) Dimensions and Minimum installation clearances General rules to follow for safe operation Proper location for installing your heater Heater Placement and Clearances Mounting installation Gas piping & connections Measuring gas pressure 2.9.1 Connecting Manometer 2.9.2 Static Pressure Test 2.9.3 Operating Pressure Test...
  • Page 3 What to do if you smell gas • Close gas valve. • Do not try to light any appliance. • Do not touch any electrical switch; do not use any phone in your building. • Immediately call your gas supplier from a neighbor’s phone.

  • Page 4: Appliance Details

    Appliance details Features Parts • Touch Pad interface control • High power pre-mix compact burner with low NOx emissions • Modulating Gas Valve with constant gas: air ratio control • Modulating water valve for improved comfort and temperature control • Freeze protection. Safety •...
  • Page 5 Combustion • NOx ≤ 55 ppm • CO ≤ 250 ppm. Dimensions • Depth (in): 8 ½” (220 mm) • Width (in): 15 ¾” (400 mm) • Height (in): 26” (650 mm) • Weight: 47 pounds (21 kg). Gas types Natural Gas.

  • Page 6: Dimensions And Minimum Installation Clearances

    Dimensions and Minimum installation clearances Fig. 3 Dimensions Cover On/Off switch Reset button LCD display Program button Temperature buttons Fig. 4 Minimum clearances Model 250 SXO TOP (A) 3 ft. 4 ft. FRONT (B) BACK 0” SIDES 4 ft. BOTTOM (C) 1 ft.

  • Page 7: General Rules To Follow For Safe Operation

    General rules to follow for safe operation B 1. You should follow these instructions when you install your heater. In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54.

  • Page 8: Heater Placement And Clearances

    Heater Placement and Clearances The 250 SXO is design certified for installation directly on a combustible wall. (see 2.7 Mounting installation) For installation on vinyl siding see Fig. 10. Keep the area below the heater free of combustible material. Minimum clearances If the appliance is installed under an overhang, there must be a 36”...
  • Page 9 B After inspection, replace front cover and tighten screws, then replace plastic decal shields. B Fix the top vent cap on the top of the heater, as shown in Fig. 8). Make sure the vent cap is well fitted by taking special care that the front cover stays inside the extended corners of the vent cap, as shown in Fig.

  • Page 10: Gas Piping & Connections

    Gas piping & connections Before connecting the gas supply, check the rating 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. In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54.
  • Page 11 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 SXO (example: ¾”...

  • Page 12: Measuring Gas Pressure

    Measuring gas pressure 2.9.1 Connecting Manometer B Shut off gas. B Remove front cover and locate inlet gas pressure measuring point (see Fig. 14). B Loosen screw inside test point fitting (do not remove) and connect manometer tube on test point. 2.9.2 Static Pressure Test B Turn gas supply back on.

  • Page 13: Water Connections

    2.10 Water connections When facing the heater, the ¾” cold water inlet is on the bottom right and the hot water outlet is on the bottom left. Install the heater where it’s centrally close to hot water use points if possible, and make hot water piping runs as short as possible.

  • Page 14: Electrical Connections

    2.11 Electrical connections Warning: Confirm that the water heater is appropriately grounded and that the installation meets all electrical codes. Outdoor electrical outlets have special requirements. Warning: safety disconnect the power supply to the heater before any service or testing is performed.
  • Page 15 2.13 For your safety operating your water heater Warning: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance is equipped with electronic ignition for lighting the main burners.

  • Page 16: Temperature Selection

    Operation instructions Fig. 19 On/Off switch Reset button Program button Increasing temperature button Decreasing temperature button LCD display Power B To start the appliance switch the button to the ON position (turn to the right position). LCD display the default temperature - temperature factory setting 122°F (50°C).
  • Page 17 Setting the water temperature The desired temperature of the hot water can be adjusted on the front control panel of the heater. The 250 SXO 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 18: Program Button

    Use of remote control accessory Fig. 23 Remote control The wireless remote control accessory and the temperature selector buttons on the front of the water heater operate identically. Contact your distributor or CEC to order if the remote control accessory is preferred.

  • Page 19: Maintenance And Service

    Maintenance and service Warning: Always turn off the electrical power supply, turn off the manual gas valve and turn off the manual water control valves whenever servicing. The unit should be checked once a year by a gas technician. If repairs are needed, the repairs should be done by a gas technician To remove front cover B See instructions to remove front cover on page 8.
  • Page 20 Test by following 4th bullet under BURNERS DO NOT IGNITE WHEN HOT WATER IS TURNED ON. LOW WATER FLOW/PRESSURE • Too many hot water applications are being used simultaneously or too much flow is being demanded The 250 SXO will effectively support two 2.0-2.5 gpm shower heads simultaneously or multiple sink applications.
  • Page 21 Display Cause Temperature limiter opened circuit (overheat). Trips at 220F (104C). No ionization during safety time (safety time out). Note: appliance makes 3 ignition attempts before entering error mode “EA”. The ionization signal momentarily disappeared more then 5 times in less then 30 seconds. CO may be out of adjustment Leakage error (gas valves do not close gas circuit).

  • Page 22: Electrical Diagram

    Electrical diagram Fig. 29 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 Connector for Anti-freeze...

  • Page 23: Sxo Functional Scheme

    250 SXO Functional scheme 250 SXO Functional scheme Fig. 31 Functional scheme 6 720 607 440...

  • Page 24: Interior Components Diagram And Parts List

    Interior components diagram and parts list Interior components Fig. 32 Components Cover On/Off switch Reset button LCD display Program button Temperature buttons Flue gas collector Mixer Heat exchanger Observation window Inlet air duct Control unit Exhaust fan Water valve Gas valve Fig.

  • Page 25: Components Diagram

    Interior components diagram and parts list Components diagram Fig. 34 Components Diagram 6 720 607 440...

  • Page 26: Parts List

    Parts list Item Description Front cover Shield Heat exchanger Heat exchanger top gasket Clip Heat exchanger bottom gasket O-ring Temperature sensor Washer 1/2" Wireform spring Air inlet duct Water filter O-ring Water valve with engine Main burner Fan / Burner gasket Set of electrodes Exhaust Fan Gas / Air Mixer...
  • Page 27 Special adjustment for measuring and adjusting CO The CO can only be adjusted by a certified gas technician with a calibrated CO Caution: One factor that may affect levels is improper gas pressure. Please Chapter 2.9 procedure to measure gas pressure and record your findings below: Static Gas Pressure: “...
  • Page 28 D. Returning to Service: 1. Return slotted cover to original position. 2. Reinstall Torx cover. 3. Remove CO analyzer probe and reinstall plug in exhaust collar. 4. Turn ON/OFF switch to the OFF (O) position and then back to the ON (I) position. 5.

  • Page 29: 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. Saving water resources: B Make sure you close all the taps after any use.

  • Page 30: Twelve Year Limited Warranty

    Twelve Year Limited Warranty General Aquastar water heaters are warranted by the Manufacturer (BOSCH) through Controlled Energy Corp. Controlled Energy Corp. (CEC) will furnish a replacement heat exchanger and will furnish a replacement of any other part which fails in normal use and service within the applicable periods specified below, in accordance with the terms of this warranty.
  • Page 31 Ins ta ller C heck lis t, to be performed by ins ta ller upon ins ta lla tion S erial Number G as Pressure R eading* B uilding W ater Pressure Average W inter Temperature Average S ummer Temperature Installing C ompany Installer name Address...

This manual is also suitable for:

250 sxo ng2400 eo ng2400 eo lp250 sxo

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