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Bosch GWH 260 PN Service Bulletin Booklet

Compact water heaters
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Service Bulletin Booklet
For Compact model water heaters
GWH 260 PN, GWH 425 PN, GWH 425 HN
GWH 1000 P, GWH 1600 P, GWH 1600 H

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  Summary of Contents for Bosch GWH 260 PN

  • Page 1 Service Bulletin Booklet For Compact model water heaters GWH 260 PN, GWH 425 PN, GWH 425 HN GWH 1000 P, GWH 1600 P, GWH 1600 H...
  • Page 2 Light the pilot flame and hold button while obser ving the me ter reading. If the reading is 24mVDC or more the thermocouple is good. ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 3: Checking The Draft

    Note: Damage to the heater as a result of improper venting will not be covered under warranty. ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 4: Checking Gas Pressure

    Tighten screw in tap fit- ting or gas leak may occur. 11. Put cover back on water heater, open gas supply and return heater to service. ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 5 1000P, 1600P, 1600H, 260PN, 425PN, 425HN Note: Damage to the heater as a result of improper venting will not be covered un- der warranty. ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 6 Water pressure should stay above 30psi during operation. If on a well system, we recommend a pressure setting of 40-60psi. 3 .5 0 4 .2 5 4.00 3.75 TABLE 1 ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 7 No inner components should be left inside. Operate heater with the flow control turned all the way clockwise. Water Governor Location ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 8 17. Reconnect electrical supply to unit, open water isolation val ves, and retur n the unit to service. ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 9: Winterizing For Seasonal Use

    9. Remove piping and save f or reinstallation when heater is returned to service. Note: If using the AQ4 powervent, all flow switch piping should be disconnected and drained. ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 10: Cleaning Inlet Filter

    6. Remove filter, clean with water and inspect for damage. 7. If the filter is at all damaged, it should be replaced. ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 11 3. Push entire burner assembly up to seperate from the gas valve. 4. Tilt right side of burners up and slide them out at an angle to the left. (Fig. 3) ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 12 3. Replace front cover when complete. 2. Put spark electrode into place and attach with clip. FIGURE 5 Gas injectors Burner fins Burner venturi passage Burners disassembled ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 13 9. Install spring first, then install plug and turn clock- wise to return to measur ed position. 10. Reinstall slot ted cap. 11. Return heater to service after correcting over pres- sure situation. ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 14: Replacing Heat Exchanger

    (Fig. 2, pos. 2) 5. Turn water on and check for leaks at connections. 6. Open gas supply, replace cover and r eturn heater to service. ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 15 Thermocouple Burners lead Pilot air Pilot air screen screen Pilot orifice Pilot orifice 1600H, 425HN pilot assembly 1000P, 1600P, 260PN, 425PN pilot assembly ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 16 • • • • • If still unable to remove, call 800-642-3111 for help. Cover screws(5) FIGURE 1 Threaded bushing (Water filter) Water Valve 2 Set screws Water valve set screw location ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 17: Testing Operation

    6. Water filter 7. Flow governor retaining clip 8. Volumetric flow governor 9. Venturi 10. Water valve cover 11. Temper ature adjustment shaf t ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 18 FIGURE 2 6. Turn on cold water supply and return the water heater to service. FIGURE 1 ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 19 Tighten nuts fur- ther if a leak is found. 6. If no leaks are found, retur n heater to service. ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 20 8mm orifice nut with appropriate wrench (See Fig. 1). Do not lose the pilot orif ice. Pilot electro valve Burner electro valve ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 21 Clip wire into bracket on top of ignition unit (425HN models only). 5. Install front cover, open cold water supply and return heater to service. ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 22 7. Reinstall heater cover as per instructions in the instal- lation manual. 8. Reopen water and gas supplies and return heater to ser vice. Flue sensor Location (view from right side of heater) ©BBT NORTH AMERICA CORPORATION Bosch Water Heating Bosch Group 340 Mad River Park, Waitsfield, VT 05673...
  • Page 23 BBT North America Corporation Bosch Group Bosch Water Heating 340 Mad River Park Waitsfield, VT 05673 Telephone 800-642-3111 Fax (802) 496-6924 www.protankless.com techsupport@protankless.com...

This manual is also suitable for:

Cwh 1000 pGwh 1600 pGwh 1600 hGwh 425 hnGwh 425 pn