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Bosch 125FX LP Installation And Operating Instructions Manual

Automatic instantaneous type water heater for use with natural and liquefied petroleum gas
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I NSTALLATION AND OPERATI NG I NSTR UCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATER FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS
(Flow Modulated with Electronic Ignition and Power Venting)
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 or gas fitter.
FEATURING: 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 6
Venting the Heater .................................... Page 7
Gas Connections .................................... Page 10
Water Connections ................................. Page 12
Electrical Connections ........................... Page 13
Maintenance & Service .......................... Page 15
Trouble Shooting ...................................... Page 16
Diagram of AquaStar ............................. Page 20
Components and Parts List .................. Page 22

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  Summary of Contents for Bosch 125FX LP

  • Page 1: Table Of Contents

    I NSTALLATION AND OPERATI NG I NSTR UCTIONS 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) Suitable for heating potable water only...
  • Page 2: Specifications

    Principle of Operation: AquaStar 125FX LP and 125FX NG Specifications When a hot water faucet is opened, the flow of water through AQ125FXNG AQ125FXLPG the heater causes the gas valve to open. At the same time max. 130 000 Btu/hr 125 000 Btu/hr a microswitch is activated which sends a spark to the pilot.
  • Page 3 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 " VENT DIAMETER 4 "...
  • Page 4: Rules For Safe Operation

    The heater may still operate even when improperly vented. GENERAL RULES TO FOLLOW It will, however, be less efficient and could eventually damage FOR SAFE OPERATION the heater. It could even result in human sickness or death due to oxygen deprivation and carbon monoxide poisoning. 1.
  • Page 5: Combustion Air Requirements

    Appliances located in confined spaces: The confined space COMBUSTION AIR REQUIREMENTS must be provided with two permanent openings, one The AquaStar water heater holds cold water in its copper commencing within 12 inches of the top and one heat exchanger and brass water valve when not in use. commencing within 12 inches of the bottom of the enclosure.
  • Page 6: Mounting The Heater

    The incandescent particle tray (shipped loose in the carton MOUNTING INSTALLATION with the water heater) must be attached at the bottom of the water heater front cover at the time of installation. Use The Aquastar 125FX is design certified for mounting on a the screws provided.
  • Page 7: Venting The Heater

    from the total vent length for each additional 90-degree elbow used. No more than four 90-degree elbows may be VENTING used. Any short vertical portion of vent pipe used in the vent system shall be considered part of the allowable 15 feet (4.6 m) maximum run.
  • Page 8 4”single wall venting only. Use stainless steel (AL29-4C) or galvanized pipe of 26 minimum gauge must be used. Each connection must be properly sealed. Approved Vent Terminal (FXHOOD or other approved terminal) The FXHOOD is design approved with the Aquastar 125FX and has a built in back draft flapper to prevent negative air from freezing the Aquastar –...
  • Page 9 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 10: Gas Connections

    GAS LINE SIZING -It is strongly recommended that the Natural Gas pipe GAS CONNECTIONS be Black Iron pipe the entire distance from the outside meter to the inlet of the Aquastar regulator. 1/2” Black Iron pipe up to 10 feet, 3/4” Black Iron pipe up to 40 feet and 1”...
  • Page 11 GAS PIPING, CONNECTIONS 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.
  • Page 12: Water Connections

    Connecting the pressure relief valve (PRV) WATER CONNECTIONS The listed pressure relief valve supplied with the heater must be installed at the time of installation. Should a discharge line be added to the PRV no valve is to be placed between the PRV and the heater.
  • Page 13: Electrical Connections

    ELECTRICAL CONNECTIONS WARNING: For safety reasons, disconnect the power supply to the heater before any service or testing is performed. WARNING: This heater must be electrically grounded in accordance with the most recent edition of the National Electrical Code, NFPA 70. In Canada, all electrical wiring to the heater should be in accordance with local codes and the Canadian Electrical Code, CSA C22.
  • Page 14: Safety Before Turning On The Heater

    The AquaStar 125FX LP and 125FX NG water heaters have a gas control that modulates burner input in response to LIGHTING AND OPERATING INSTRUCTIONS flow.
  • Page 15: Maintenance & Service

    140° and 95°F at various flow rates between 2.0 and 4.0 Water Valve (Part # 8707002802): The water valve on gallons per minute. The position you select on the this heater should be serviced periodically. Lubricate temperature selector dial will depend on the temperature of component #36 on page 22 with a small amount of silicon, the incoming water (50°F is average in the U.S.).
  • Page 16: Trouble Shooting

    3. Water flow is not sufficient to activate heater. Water flow rate at faucet is below minimum flow needed to activate heater. When temperature adjustment knob is turned all the way clockwise, the AquaStar model 125FX requires 1/2 gallon per minute flow to activate the heater. As a reference, this is a flow which would fill a quart jar in 30 seconds.
  • Page 17 PILOT SPARKS CONTINUOUSLY WITH NO WATER Mineral deposits can eventually (3-5 years in hard water RUNNING areas) corrode the water valve parts to a point where they will need replacing. Any sign of moisture at the bleed hole 1. Microswitch needs adjustment is a sign that the water valve needs to be replaced If no water is running, but pilot electrode continuously sparks, immediately.
  • Page 18 WATER IS TOO HOT HOT WATER TEMPERATURE FLUCTUATES / UNIT DEACTIVATED 1. Temperature Selection too high 1. Unbalanced pressure in waterlines Turn the temperature adjustment knob counter-clockwise The added restriction caused by the Aquastar in the hot (to the left) to lower the maximum water temperature. water system can result in uneven pressures between the Note: This will increase the activation flow rate.
  • Page 19 6 720 606 601...
  • Page 20 6 720 606 601...
  • Page 21: Diagram Of Aquastar

    Diagram of AquaStar 125FX Fig. 15 - 6 720 606 601-12. 1 AL electric control box Heat exchanger Pilot assembly Power cord Burner manifold gas on/off switch pressure test nipple Temperature adjustment selector Main gas burner Microswitch Pilot gas tubing Gas inlet gas pressure test nipple Gas valve Exhaust Fan...
  • Page 22: Components And Parts List

    - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST Fig. 16 6 720 606 601...
  • Page 23 Fig. 16 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 125FX Cover 8 705 421 775 Temperature adjustment knob 8 702 000 111 Temperature adjustment collar 8 700 403 008 Draft diverter 8 705 505 451 Heat exchanger 8 705 406 235 Overheat sensor (ECO) 8 707 206 040 Main burner...
  • Page 24 - Flow chart of Aquastar 125 FX Fig. 17 6 720 606 601...
  • Page 25: Limited Warranty

    Aquastar water heaters are warranted by the Manufacturer This warranty does not cover any labor costs associated (BOSCH) through Controlled Energy Corp. Controlled with service, removal or re-installation of part(s). All such Energy Corp. (CEC) will furnish a replacement heat costs must be borne by the Purchaser.
  • Page 26 † † † † † † Replacement Parts available from North American Distributor CONTROLLED ENERGY CORP. VULCANO Termodomésticos S.A. 340 Mad River Park Estrada de Cacia Waitsfield, Vermont 05673 3801 - 856 Aveiro - PORTUGAL Phone 800-642-3111 Fax (802) 496-6924 www.controlledenergy.com/tech techsupport@controlledenergy.com ©...

This manual is also suitable for:

125fx ng