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Bosch 125B LP 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 LP and 125B NG (Flow Modulated)
Intended for variable flow applications with steady cold water inlet temperatures only
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
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 9
Safety before lighting the pilot ............................ Page 9
Lighting instructions ......................................... Page 10
Setting water temperature ................................ Page 10
Maintenance & Service ..................................... Page 10
Trouble Shooting ............................................... Page 11
Diagram of AquaStar ......................................... Page 14
Components and Parts List .............................. Page 15

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  Summary of Contents for Bosch 125B 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 125B LP and 125B NG (Flow Modulated) Suitable for heating potable water only Not approved for space heating purposes Intended for variable flow applications with steady cold water inlet temperatures only...
  • Page 2: Specifications

    This well engineered, gas water heater has all the fea- AquaStar 125B LP and 125B NG Specifications tures a water heater should have: It operates on the principle of heating water instantaneously “on demand”. When a hot water faucet is opened, cold 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 125B TOP (A) 12 " FRONT (B) 4 " BACK 0 " SIDES 4 " FLOOR (C) 12 " * VENT DIAMETER 5 "...
  • Page 4: Rules For Safe Operation

    GENERAL RULES TO FOLLOW PROPER LOCATION FOR INSTALLING FOR SAFE OPERATION YOUR HEATER Carefully select the location of your new heater. For your 1. You should follow these instructions when you install safety and for proper heater operation, you must provide an your heater.
  • Page 5: Combustion Air Requirements

    Appliances located in confined spaces: The confined space must be provided with two permanent openings, one commencing within 12 inches of the top and one commencing within 12 inches of the bottom of the enclosure. Each opening must have a minimum free area of one square inch per: - 1000 Btu/hr if all air is taken from inside the building.
  • Page 6: Venting The Heater

    Expansion and contraction of piping due to changing water Consult your gas utility or National Fuel Gas Code if temperature in the pipes imparts movement to the heater vent will have elbows or share venting with another which, if mounted directly to a brittle, friable board, such appliance.
  • Page 7: Gas Connections

    These readings should be taken while the heater is operating at full input — i.e. maximum water flow 5” X 6” ADAPTOR with the temperature dial selector turned all the way USED ON HIGH ALTITUDE clockwise. MAXIMUM INLET GAS FLOW PRESSURE SETTING Altitude Natural Gas Liquid Propane...
  • Page 8 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 9: Water Connections

    WATER CONNECTIONS replacement, and be mounted as close to the water heater as possible. See Fig 7. When facing the heater, the cold water inlet is on your right To install the PRV, a suitable fitting connected to an and the hot water outlet is on your left. extension on a “T”...
  • Page 10: Lighting Instructions

    LIGHTING INSTRUCTIONS (as seen on front cover of heater) 1. STOP! Read the safety information above on this plate. 2. The Gas valve must be turned off by sliding the gas valve button to the far left under the OFF ( ) mark.
  • Page 11: Trouble Shooting

    thermocouple. If it is too small, the pilot burner must be Main Burner Flames: The main burner flames should be cleaned. To obtain a spark, the position of the Piezo igniter blue, with a more intense blue cone in the center core. electrode should be approximately 3 mm (1/8") from the Yellow flames could be a sign of wrong size gas orifices or pilot burner tip.
  • Page 12 Although the filters can lengthen the cleaning intervals, 6. Faulty thermocouple (part #8747202083) or they can never completely prevent such clogging. In electromagnet ) Unless these 2 parts are at least 8 consequence the gas jet issuing from the pilot orifice is to 10 years old, it is very unlikely that they are faulty.
  • Page 13 7. Water valve parts may be dirty or components 3. Btu input is too low due to insufficient gas pressure damaged. It is extremely important for a tankless Water valve and component parts must be totally free of instantaneous water heater to have the right size dirt.
  • Page 14: Diagram Of Aquastar

    Diagram of AquaStar 125 B Fig. 11 - Heat exchanger Gas control slide Pilot assembly Piezo igniter Burner manifold gas Water valve pressure test nipple Temperature adjustment Main gas burner selector Pilot gas tubing Gas inlet gas pressure Gas valve test nipple Pressure tap screw location...
  • Page 15: Components And Parts List

    - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST Fig. 12...
  • Page 16 Fig. 12 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 125B Cover ¤ 8 705 421 025 Temperature adjustment knob comp. ¤ 8 702 000 219 Temperature adjustment knob ¤ 8 702 000 111 Water connections gasket ¤ 8 710 103 043 Draft divertor ¤...
  • Page 20 IN S T A L L A T IO N C H E C K L IS T G A S L INE S IZE Na tu r a l G a s No m inal I ro n P ip e S ize * 1 /2 "...

This manual is also suitable for:

125b ng