AquaStar 125B NGS specifications For Your Safety, Table of Contents

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I N STALLATION AN D OPE RATI NG I N STR UCTION S FOR AUTOMATIC INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND LIQUEFIED PETROLEUM GAS

MODEL 125B LPS and 125B NGS (Thermostatically Modulated)

Suitable for heating potable water only Not approved for space heating purposes

Intended for domestic hot water with preheated inlet water as with solar hot water.

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

6 720 606 518 US (06.01) AL

WARNING: Improper installation, 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: Automatic Variable Power Modulating Gas Valve with Thermostatic Control

Warning: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

Specifications

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Rules for safe operation

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Locating the Heater

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Combustion Air Requirements

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Mounting the Heater

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Venting the Heater

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Gas Connections

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Water Connections

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Safety before lighting the pilot

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Lighting instructions

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Information on water temperature

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Maintenance & Service

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Trouble Shooting

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Diagram of AquaStar

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Components and Parts List

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Warranty

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Contents Table of Contents For Your SafetyUnpacking the Aquastar Heater FeaturesRequired Natural Gas Pressure at inlet tap Model 125BS Front View Side ViewTOP a Front B Back Sides Floor C Vent Diameter General Rules to Follow For Safe Operation Proper Location for Installing Your HeaterClearances Combustion AIR RequirementsAquastar 125 B S is design certified for mounting on a wall Mounting InstallationFigure a VentingFigure C 720 606 Masonry Chimneys6 Adaptor Used on High Altitude Vent Adaptor for High Altitude InstallationsFor LP GAS GAS Line Sizing For Natural GASMaximum Capacity of Semi-Rigid ColumnGAS Line Sizing Maximum Inlet GAS Flow Pressure SettingWater Connections Above 4.500 ft consult your local gas supplierOperating Instructions For Your Safety Read Before Lighting the PilotWhat to do if YOU Smell GAS To Turn OFF GAS to AppliancePilot burner with air screen/ pilot orifice Maintenance and ServicePilot Light will not Light Pilot Lights but Flame Goes OUT When Button is ReleasedAir in the Gas Line Gas pressure too low Burners do not Ignite When HOT Water is Turned onWater is TOO HOT Water is not HOT EnoughUnbalanced pressure in waterlines HOT Water Temperature Fluctuates / Unit DeactivatedDiagram of AquaStar 125 BS Interior Components Diagram and Parts List Interior Components Diagram Parts List 125BS Flow chart of Aquastar 125 BS General Limited Warranty720 606 720 606 BBT North AMERICA, Waitsfield, VT all rights reserved Bosch Group