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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 and power generated Electronic Ignition 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 Gas Piping ......................................................... Page 8 Water Connections ............................................ Page 9 Safety before turning on the heater ..................... Page 9 Operating instructions ...................................... Page 10 Setting water temperature ................................ Page 10 Maintenance & Service......................................Page 11 Trouble Shooting ...............................................Page 11 Electrical Diagram ............................................ Page 13 Diagram of AquaStar......................................... Page 14 Interior components diagram ............................ Page 16 Parts List ......................................................... Page 17 6 720 606 562 (02.03) AL Principle of Operation: When a hot water faucet is opened, the water flow through the heater causes the gas valve to open. At the same time the hydro-generator activates the electronics which sends a spark to the pilot. The flame sensor confirms the pilot has been lighted and allows the first two burners to come on. The flame sensor confirms correct activation and all burners come on. The pilot goes off. The heat exchanger coils absorb the heat generated by the burners and transfer heat to the water. When the hot water faucet is shut off, the gas valve automatically closes and the burners turn off. Your hot water faucet is an ignition key to activate the water heater, giving you control over your hot water energy use. Every time you turn off your hot water faucet, the energy consumption of your hot water returns to zero. FEATURES -Electronic Pilot Ignition driven by hydro-generator -High Quality Materials for Long Working Life. -Copper heating coils for endless supply of hot water. -Burner output proportional to hot water flow demand for maximum energy efficiency. -Safety flame sensor at pilot burner. -Automatic overheating protection shut-off sensor. -Temperature limiter. -Flue gas safety device. -Stainless steel burners with stabilized blue flame. -Built-in corrosion resistant draft inducer. -Compact space saver: mounts on a wall with two hooks. -Easily removable one-piece cover. -Easy one person installation. -Adjustable water flow restrictor to ensure that water flow demand will not exceed the heating capacity of the heater. -On/Off Switch to activate system. -Red LED indicator flashes with low water pressure. -Green LED indicator main burner condition. BOSCH is constantly improving our products, therefore specifications are subject to change without prior notice. UNPACKING THE AQUASTAR HEATER AquaStar 125HX LP and 125HX NG Specifications Gas Input max.: 117,000 Btu/hr min.: 28,000 Btu/hr Water Connection .” Thread fitting NPT H x W x D 29 3/4” x 18 1/4” x 8 3/4" Vent 5” Gas Connection 1/2” NPT thread Min. Water Pressure 18 Psi at 4 GPM Max. Water Pressure 150 Psi Shipping Weight 43 LB Net Weight 40 LB 1.8 GPM at 90° rise 3.7 GPM at 45° rise Min. Water Flow 1/2 gal/min LP GAS Supply Pressure (before Aquastar regulator) min. 11” W.C. max. 14” W.C.* Required LP GAS Pressure at inlet tap while Aquastar is operating: 10.5” W.C. LP GAS Burner Manifold pressure while Aquastar is operating at maximum input: 9.0” W.C. Natural Gas Supply Pressure (before Aquastar regulator) min.: 7” W.C. max....