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Bosch AQUASTAR 125B LPL Installation And Operating Instructions Manual

Automatic instantaneous type water heaters for use with natural and liquefied petroleum gas
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INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS
MODEL 125B LPL and 125B NGL (Non-Modulated)
Certified for space heating in combination with potable water only
Not certified for space heating only. Intended for either recirculation to storage or cold water inlet flow that
is non-varying. For variable flow, install the 125 B or the 125 X model.
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.
Warning: If you do not follow these instructions exactly, a
fire or explosion may result causing property damage,
personal injury or loss of life
Suitable for heating potable water
: 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 5
Combustion Air Requirements ............................ Page 5
Mounting the Heater ........................................... Page 6
Venting the Heater ............................................. Page 6
Gas Connections ............................................... Page 7
Water Connections ............................................ Page 8
Safety before lighting the pilot ............................ Page 9
Lighting instructions ........................................... Page 9
About Water Temperature .................................. Page 9
Maintenance & Service ....................................... Page 9
Trouble Shooting .............................................. Page 10
Diagram of AquaStar ......................................... Page 13
Components and Parts List .............................. Page 14

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  Summary of Contents for Bosch AQUASTAR 125B LPL

  • Page 1: Table Of Contents

    INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND LIQUEFIED PETROLEUM GAS MODEL 125B LPL and 125B NGL (Non-Modulated) Suitable for heating potable water Certified for space heating in combination with potable water only Not certified for space heating only.
  • Page 2: Specifications

    This well engineered, gas water heater has been AquaStar 125B LPL and 125B NGL Specifications specially designed to operate as a circulating water heater. Gas Input max.: 117,000 Btu/hr min.: 60,000 Btu/hr FEATURES Water Connection 1/2” Thread fitting - High Quality Materials for Long Working Life. H x W x D 29 3/4”...
  • Page 3 FRONT VIEW SIDE VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS MODEL 125BL 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 125BL...
  • Page 4: Rules For Safe Operation

    If you are using the AquaStar for combined space heating and potable water heating (see schematic diagram below), all piping and other components connected to the system must be suitable for potable water, (b) toxic chemicals such as those commonly used for boiler treatment to prevent corrosion and freezing must not be introduced into the system, and (c) if the space heating requires water temperatures higher than those required for do- mestic, potable water, a mixing valve or other similar device must be provided to reduce...
  • Page 5: Locating The Heater

    7. Correct gas pressure is critical for the optimum WARNING: The water in this water heater is cold operation of this heater (see specifications on page 2). Gas and always remains cold except for the times that hot piping must be sized to provide the required pressure at water is being used DO NOT INSTALL IN AN AREA the maximum output of the heater, while all the other gas WHERE IT COULD FREEZE.
  • Page 6: Clearances

    dilution of flue gases. which, if mounted directly to a brittle, friable board, such Appliances located in confined spaces:) The confined space as plasterboard, can cause failure of mounting. must be provided with two permanent openings, one In earthquake-prone zones, CEC recommends that commencing within 12 inches of the top and one installers use a large washer and lag screw through the commencing within 12 inches of the bottom of the...
  • Page 7: Gas Connections

    Code if vent will have elbows or share venting with another appliance. 5” X 6” ADAPTOR The vent connector should have as much vertical rise USED ON HIGH ALTITUDE as possible (minimum 12”) before any horizontal run. Optional powervent available in order to sidewall vent. Contact your local dealer.
  • Page 8: Water Connections

    NOTE: The gas pressures specified below refer to NOTE: Do not apply soap solution to pilot filter screen or pressures taken at the test pressure nipple on the gas pilot orifice area. If you have a leak, shut off the gas. After inlet pipe just above the regulator (See Fig 4).
  • Page 9: Safety Before Lighting The Pilot

    If control button(s) are jammed, close the gas supply and Connecting the pressure relief valve (PRV) call a qualified service technician. Attempted forceful repair A listed pressure relief valve supplied with the heater must may result in a fire or explosion. be installed at the time of installation.
  • Page 10: Trouble Shooting

    toward you and lift up and out. THE FOLLOWING To access the pilot orifice, remove 2 screws holding pilot OPERATIONS SHOULD BE PERFORMED BY A assembly in place. Then loosen compression fittings to QUALIFIED SERVICE PERSON: expose pilot orifice. Vent System: Should be checked annually. Clean and repair as needed.
  • Page 11 C. Gas regulator may be shut or damaged. Tighten the thermocouple nut snugly but not too tight. 2. In-line AquaStar gas regulator jammed (usually on 4. Poor circuit connections at the ECO. (Energy Cut- LP gas) Off overheat protection) Replace or unjam the regulator. Note: The regulator Oxidation or looseness of the ECO terminal connections furnished with the heater is designed for low gas pressure.
  • Page 12 system preventing the pressure drop in the Aquastar (i.e. temperature relay for the primary circulator pump is possibly cold water is entering the water heater from both sides and set too high. the burners will not come on). To confirm there is no crossover in the plumbing, shut off WATER IS NOT HOT ENOUGH the cold water supply to the AquaStar.
  • Page 13: Diagram Of Aquastar

    Fig. 10 - Diagram of AquaStar 125 BL Gas control slide Heat exchanger Piezo igniter Pilot assembly Location of pressure tap Burner manifold gas nipple pressure test nipple Water valve Pilot gas tubing Gas inlet gas pressure Main gas burner test nipple Gas valve...
  • Page 14: Components And Parts List

    Fig. 11 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST...
  • Page 15 Fig. 11 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 125BL Cover ¤ 8 705 421 031 Cap cover ¤ 8 703 304 011 Water connection gasket ¤ 8 710 103 043 Draft divertor ¤ 8 705 505 354 Heat exchanger ¤ 8 705 406 235 Hot water pipe ¤...
  • Page 16: Installation Checklist

    INSTALLATION CHECKLIST GAS LINE SIZE Natural Gas Nominal Iron Pipe Size* 1/2" 3/4" 1" 150' MAXIMUM LENGTH Liquid Propane Semi-rigid Tubing 1/2" 5/8" 3/4" 7/8" 150' MAXIMUM LENGTH RECOMMENDED * Flex tubing greatly reduces capacity and, therefore, is not recommended. Minimum Vent Size* and Height Minimum Diameter Minimum Height**...

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Aquastar 125b ngl