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Bosch 125FX LP Installation And Operating Instructions Manual

Bosch model 125fx lp and 125fx ng user manual
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INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATER FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS
(Flow Modulated with Electronic Ignition and Power Venting - a Type III Category Appliance)
Intended for variable flow applications with steady cold water inlet temperatures
WARNING
adjustment, alteration, 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.
Upon completion of the installation, these instructions
should be handed to the user of the appliance for
future reference.
In the Commonwealth of Massachusetts this product
must be installed by a licensed plumber.
FEATURING: Automatic Variable Power Modulating Gas
Valve, Electronic Ignition and Power Venting
MODEL 125FX LP and 125FX NG
Suitable for heating potable water only
Not approved for space heating purposes
: Improper installation,
WARNING
If the information in this manual is not followed
exactly. A fire or explosion may result causing property
damage, personal injury or death.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable,
combustible or corrosive vapors and liquids in the
vicinity of this or any other appliance.
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.
- Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.
- If you cannot reach your gas supplier, call the fire
department.
- Installation and service must be performed by a
qualified installer, service agency or the gas supplier.

TABLE OF CONTENTS

Specifications .................................................... Page 2
Rules for safe operation .................................... Page 4
Locating the Heater ............................................ Page 4
Combustion Air Requirements ............................ Page 5
Mounting the Heater ........................................... Page 5
Venting the Heater ............................................. Page 6
Gas Connections ............................................... Page 9
Water Connections .......................................... Page 10
Electrical Connections ...................................... Page 11
Safety before turning on the heater ................... Page 12
Lighting and Operating instructions .................. Page 12
Setting water temperature ................................ Page 12
Maintenance & Service ..................................... Page 13
Trouble Shooting .............................................. Page 14
Diagram of AquaStar ......................................... Page 17
Components and Parts List .............................. Page 18

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Table of Contents
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  Summary of Contents for Bosch 125FX LP

  • Page 1: Table Of Contents

    INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC INSTANTANEOUS TYPE WATER HEATER FOR USE WITH NATURAL AND LIQUEFIED PETROLEUM GAS MODEL 125FX LP and 125FX NG (Flow Modulated with Electronic Ignition and Power Venting – a Type III Category Appliance) Not approved for space heating purposes...
  • Page 2: Specifications

    The FXHOOD horizontal vent terminator is supplied separately from the 125FX water heaters. There is a set of installation instructions in the FXHOOD box. AquaStar 125FX LP and 125FX NG Specifications AQ125FXNG max. 130 000 Btu/hr 125 000 Btu/hr Gas input min.
  • Page 3 FRONT VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS TOP (A) FRONT (B) BACK SIDES FLOOR (C) VENT DIAMETER * On a combustible wall surface the unit should be mounted away from the wall to provide adequate clearance of the vent pipe. See page 5 for instructions.
  • Page 4: Rules For Safe Operation

    6. Keep water heater area clear and free from combustibles and flammable liquids. Do not locate the heater over any material that might burn. Do not install heater over carpeting.
  • Page 5: Combustion Air Requirements

    AquaStar heat exchanger. To prevent this the FXHOOD horizontal vent terminator, which is supplied separately with the water heater, needs to be installed on the end of the horizontal vent run (see page 7). The FXHOOD is a CSA approved vent terminator for the Aquastar 125FX and has a built in back draft flapper.
  • Page 6: Venting The Heater

    Fig. 2 - Mounting the Heater The incandescent particle tray (shipped loose in the carton with the water heater) must be attached at the bottom of the water heater front cover at the time of installation. Use the screws provided. See figure 3.
  • Page 7 An approved side wall vent terminal must be used when the water heater is vented through a side wall. Locate in accordance with ANSI Z223.1 and local applicable codes. See Fig 5 for restrictions in location of vent terminal in relation to opening doors and windows, grade, and forced air inlets.
  • Page 8 The approved vent terminal must be installed so that flue gases will not jeopardize people, overheat combustible structures or enter into buildings, and so that proper clearances are maintained (See Fig 5). a) The vent terminal shall not be less than 7 feet above a public walkway. b) The vent terminal shall terminate at least 3 feet above any (mechanical) air inlet within 10 feet.
  • Page 9: Gas Connections

    GAS PIPING, CONNECTIONS and Gas Regulator Before connecting the gas supply, check the rating plate on the right side of the front cover 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 10: Water Connections

    .5 psig. The water heater must be isolated from the gas supply piping system by closing the manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or greater than .5 psig.
  • Page 11: Electrical Connections

    PRV and the line. The location of the PRV must be readily accessible for servicing or replacement. and be mounted as close to the water heater as possible. To install the PRV, a suitable fitting connected to an extension on a “T”...
  • Page 12: Safety Before Turning On The Heater

    Fig. 11 - Principles of Operation SETTING THE WATER TEMPERATURE The AquaStar 125FX LP and 125FX NG water heaters have a gas control that modulates burner input in response to flow. Its purpose is to ensure that the hot water temperature will remain steady, although the demand for water flow might vary (down to 1/2 gal/minute).
  • Page 13: Maintenance & Service

    between will give various temperatures between 140° and 95°F at various flow rates between 2.0 and 4.0 gallons per minute. The position you select on the temperature selector dial will depend on the temperature of the incoming water (50°F is average in the U.S.). In warm weather regions where the incoming cold water is generally warmer, or during the hot weather months in some other areas a midway setting on the temperature selector knob will produce a...
  • Page 14: Trouble Shooting

    6. Cross over in water lines To confirm there is no cross-over in the plumbing, shut off the cold water supply to the AquaStar water heater and open a hot water faucet. There should not be any water flowing at that faucet. Water running is a sign of a plumbing cross-over.
  • Page 15 ½ psig). Excessive pressure will lock it up. Locking usually happens when the gas pressure between the gas tank and the water heater’s gas regulator has not been properly regulated. See Page 2 for recommended correct gas pressure. To unlock a regulator, consult your gas supplier or call CEC.
  • Page 16 3. Gas pressure is insufficient It is extremely important for a tankless instantaneous water heater to have the right size gas line to obtain the correct gas pressure. See specifications on page 2. Unlike storage tank water heaters, the burners of a tankless...
  • Page 17: Diagram Of Aquastar

    Heat exchanger Pilot assembly Burner manifold gas pressure test nipple Main gas burner Pilot gas tubing Gas valve Electronic control box Diagram of AquaStar 125FX Fig. 17 - Power cord on/off switch Temperature adjustment selector Microswitch Gas inlet gas pressure test nipple Electric box Exhaust Fan...
  • Page 18: Components And Parts List

    Front Cover AquaStar Decal Plastic lower snap-on Temperature adjustment knob complete Temperature adjustment knob Exhaust fan assembly Draft diverter Fan protection Flue gas safety device Heat Exchanger Hot water pipe Washer Overheat sensor (ECO) Cold water pipe Main burner assembly Washer for burner assembly Throttle disc Gas Valve...
  • Page 19 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST Fig. 18...
  • Page 20 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 techsuppport@controlledenergy.com Recycled paper † † † † © 2001 Controlled Energy Corporation, Waitsfield, VT a l l r i g h t s r e s e r v e d †...

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125fx ng