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Bosch AquaStar 125X LP Installation And Operating Instructions Manual

Bosch automatic instantaneous type water heaters for use with natural and liquefied petroleum gas (flow modulated with electronic ignition) suitable for heating potable water only not approved for space heating purposes
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INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS
MODEL 125X LP and 125X NG (Flow Modulated with Electronic Ignition)
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.
FEATURING: Automatic Variable Power Modulating Gas
Valve and Electronic Ignition
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
- 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 7
Water Connections ............................................ Page 8
Safety before turning on the heater ..................... Page 8
Operating instructions ........................................ Page 9
Maintenance & Service ..................................... Page 10
Trouble Shooting .............................................. Page 10
Microswitch Adjustment .................................... Page 11
Electrical Diagram ............................................ Page 12
Diagram of AquaStar ......................................... Page 13
Interior components diagram ............................ Page 14
Parts List ......................................................... Page 15

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  Summary of Contents for Bosch AquaStar 125X LP

  • Page 1: Table Of Contents

    INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND LIQUEFIED PETROLEUM GAS MODEL 125X LP and 125X NG (Flow Modulated with Electronic Ignition) Suitable for heating potable water only Not approved for space heating purposes...
  • Page 2: Specifications

    Principle of Operation: AquaStar 125X LP and 125X NG Specifications When a hot water faucet is opened, the water flow through the heater causes the gas valve to open. At the same time a microswitch is activated which sends a spark to the Gas Input max.: 117,000 Btu/hr...
  • Page 3 FRONT VIEW SIDE VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS MODEL 125 X TOP (A) 12" FRONT (B) 4" BACK 0" SIDES 4" FLOOR (C) 12" * FLUE DIAMETER 5" * Some local codes require 18” in garage installations AQUASTAR MODEL 125X...
  • Page 4: Locating The Heater

    GENERAL RULES TO FOLLOW The heater may still operate even when improperly vented. 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

    This product is not approved for manufactured homes Louvers, grills and screens have a blocking effect. If the (mobile home), recreational vehicles (RV) or boats. effective free area is not known, increase the sizes of your Reference ANSI Z21.10.3. openings by 75% if your louvers are wood and by 30% if This product is neither designed or approved for your louvers are metal.
  • Page 6: Mounting The Heater

    at least 1/4 inch for every foot of its horizontal length. Keep the horizontal section short and avoid too many elbows. WALL STUDS To check the draft: Close all doors and windows to the outside. 13 ¼” Turn on all appliances that force air out of the building. SUPPORT BOARD These include all exhaust/ventilation fans, furnaces, clothes dryers, wood burning stoves, etc.
  • Page 7: Gas Connections

    GAS CONNECTIONS and Gas Regulator GAS LINE SIZING Before connecting the gas supply, check the rating plate -It is strongly recommended that the Natural Gas pipe on the right side of the front cover to be sure that the heater be Black Iron pipe the entire distance from the outside is rated for the same gas to which it will be connected.
  • Page 8: Water Connections

    WATER CONNECTIONS The location of the PRV must be readily accessible for servicing or replacement., and be mounted as close to the When facing the heater, the cold water inlet is on your right water heater as possible. See Fig 7. To install the PRV, a and the hot water outlet is on your left.
  • Page 9: Lighting And Operating Instructions

    LIGHTING AND OPERATING INSTRUCTIONS 1. STOP! Read the safety information above on this label. 2. The gas valve must be shut off by putting the ON/OFF TEMPERATURE switch to position “0”. Wait five (5) minutes to clear out ADJUSTMENT KNOB any gas.
  • Page 10: Maintenance & Service

    MAINTENANCE AND SERVICE Do not use any wire or sharp object to clean orifices. Natural gas orifices are large enough that you can usually REVIEW MAINTENANCE TABLE ON THE BACK clean them by blowing through them. LP orifices, on the OF THIS MANUAL other hand, are too small to clean and should be replaced.
  • Page 11 NO SPARK AT THE PILOT 7. Cold incoming water connection made to wrong side of heater Make sure cold water inlet connection is on the right side 1. On/Off switch is not ”On” (Position I). of heater when you are facing heater. The On/Off switch is located behind the flipdown cover plate on the front panel strip.
  • Page 12: Microswitch Adjustment

    PILOT SPARKS CONTINUOUSLY WITH NO WATER WATER IS NOT HOT ENOUGH RUNNING 1. Temperature selection too low. 1. Microswitch needs adjustment Change the setting. Turn the temperature adjustment knob If no water is running, but pilot electrode continuously clockwise (to the right). sparks, the microswitch screw to the water valve needs Note: This will decrease the activation flow rate.
  • Page 13: Diagram Of Aquastar

    2. Cold water is mixing with the hot water between the AquaStar and the outlet See #4 under “NO SPARK AT THE PILOT”. Inlet water pressure is erratic due to inadequate supply water pressure or saturated pressure tank on well system Check the inlet water pressure.
  • Page 14 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST Fig. 15...
  • Page 15: Interior Components Diagram

    Fig. 15 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 125X Front cover ¤ 8 705 421 255 Temperature adjustment knob comp. ¤ 8 702 000 219 Temperature adjustment knob ¤ 8 702 000 111 Water connection gasket ¤ 8 710 103 043 Draught diverter ¤...
  • Page 16 INSTAL LATION CHECKLIST MODE L 125X GAS L INE SIZE Na tu ra l G a s No m inal Iro n P ip e S ize * 1 /2 " 3 /4 " 1 " 1 0 ' 4 0 ' 1 5 0 ' M A X IM UM LE NGTH L iq u id P ro p a n e...

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Aquastar 125x ng