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Bosch 125FX LP Installation And Operating Instrictions

Automatic instantaneous type water heater for use with natural and liquefied petroleum gas
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INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATER FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS
MODEL 125FX LP and 125FX NG
III
Intended for variable flow applications with steady cold water inlet temperatures.
For preheated domestic hot water, install the 125 BS model. For recirculating applications, install the 125 BL model.

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  Summary of Contents for Bosch 125FX LP

  • Page 1 INSTANTANEOUS TYPE WATER HEATER FOR USE WITH NATURAL AND LIQUEFIED PETROLEUM GAS MODEL 125FX LP and 125FX NG Intended for variable flow applications with steady cold water inlet temperatures. For preheated domestic hot water, install the 125 BS model. For recirculating applications, install the 125 BL model.
  • Page 2 AQ125FXNG AQ125FXLPG max. 130 000 Btu/hr 125 000 Btu/hr Gas input min. 28 000 Btu/hr 28 000 Btu/hr...
  • Page 3: Front View

    FRONT VIEW SIDE VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS MODEL 125FX TOP (A) 12" FRONT (B) 4" BACK 0" SIDES 4" FLOOR (C) 12" * FLUE DIAMETER 4" AQUASTAR MODEL 125FX...
  • Page 4 National Electrical Code CSA 22.1 Electrical Code.
  • Page 8 VENT HOOD MUST BE MOUNTED ONE FOOT MINIMUM ABOVE DOORS AND WINDOWS VENT HOOD MUST BE MOUNTED FOUR FEET AWAY FROM DOORS AND WINDOWS VENT HOOD VENT HOOD MUST BE MOUNTED FOUR FEET MINIMUM BELOW WINDOWS...
  • Page 9 Nominal Iron Length of Black Iron Pipe, Feet Pipe Internal Size, Diameter inches inches 0.364 0.493 0.622 0.824 1.049 1 1/4 1.380 1050 1 1/2 1.610 1600 1100 2.067 3050 2100 1650 1450 1270 1150 1050 2 1/2 2.469 4800 3300 2700 2300...
  • Page 10 Altitude Natural Gas Liquid Propane inches W.C: inches W.C: 0’ - 2.000 ft 5.38 2.000 ft - 4.500 ft 4.40 7.90 Fig. 7 - Water valve and S bend water connectors - top view...
  • Page 11 THREADED ASSEMBLY SWEATED ASSEMBLY 1/2” ELBOW 1/2” ELBOW S FITTING S FITTING Pressure Pressure Relief Relief PIPE PRV TO PIPE PRV TO Valve Valve APPROPRIATE APPROPRIATE DISCHARGE DISCHARGE 1 - microswitch 9 - ionization probe (flame 2 - electric control box sensor) 3 - exhaust fan 10 - pilot electrode...
  • Page 12 To operate the heater, set the ON/OFF switch to position I. The switch is located behind the flip down cover plate on the front panel strip. To shut down the gas to the heater, set the ON/OFF switch to position 0 Temperature Adjustment Knob Decrease Increases temperature...
  • Page 13 TEMPERATURE ADJUSTMENT KNOB...
  • Page 14 PILOT ORIFICE The AquaStar 125FX pilot and burners are ignited by a water flow valve. Numerous water related problems can cause this water valve to malfunction such as: Insufficient water flow volume to activate the burners at its minimum flow requirement; Dirt in the water flow valve causing it to malfunction;...
  • Page 15 Do not add any flow restrictor to the shower head.
  • Page 16: Water Is Not Hot Enough

    Do not add any flow restrictor to the shower head. WATER IS NOT HOT ENOUGH EXHAUST FAN DOES NOT OPERATE FAN CIRCULATES WHEN HOT WATER IS SHUT HOT WATER TEMPERATURE FLUCTUATES...
  • Page 17 Power cord Heat exchanger on/off switch Pilot assembly Temperature adjustment selector Burner manifold gas Microswitch pressure test nipple Gas inlet gas pressure test nipple Main gas burner Electric box Pilot gas tubing Exhaust Fan Gas valve Electronic control box...
  • Page 20 Replacement Parts available from North American Distributor...

This manual is also suitable for:

125fx ng