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Bosch 125HX LP Installation And Operating Instructions Manual

Bosch operating instruction water heater 125hx lp and 125hx ng
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INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND
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.
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
LIQUEFIED PETROLEUM GAS
MODEL 125HX LP and 125HX NG
(Flow Modulated with 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
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

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  Summary of Contents for Bosch 125HX LP

  • Page 1: Table Of Contents

    INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND MODEL 125HX LP and 125HX NG Suitable for heating potable water only Not approved for space heating purposes Intended for variable flow applications with steady cold water inlet temperatures.
  • Page 2: Specifications

    Do not lose this manual, as there is a charge for replacement. Please complete and return the enclosed warranty registration card. AquaStar 125HX LP and 125HX NG Specifications Gas Input max.: 117,000 Btu/hr min.: 28,000 Btu/hr...
  • Page 3 FRONT VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS 6 720 606 562 (02.03) TOP (A) FRONT (B) BACK SIDES FLOOR (C) VENT DIAMETER * Some local codes require 18” in garage installations AQUASTAR MODEL 125HX SIDE VIEW MODEL 125 HX...
  • Page 4: Locating The Heater

    Failure to properly vent a dryer could result in a gradual accumulation of lint on the water heater fin coils and burners, leading to a dangerous condition of vent blockage and poor unsafe combustion.
  • Page 5: Combustion Air Requirements

    This product is neither designed or approved for outside installations. COMBUSTION AIR REQUIREMENTS The AquaStar water heater holds cold water in its copper heat exchanger and water valve when not in use. Because of this, any cold air that comes in through the unit’s vent pipe is capable of freezing these components.
  • Page 6: Mounting The Heater

    Fig. 1 - Mounting the Heater The incandescent particle tray (shipped loose in the carton with the water heater) must be attached at the bottom of the water heater front cover at the time of installation. Use the screws provided. See figure 2 INCANDESCENT PARTICLE TRAY Fig.
  • Page 7: Gas Connections

    0.5 psig. The water heater must be isolated from the gas supply piping system by closing the manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or more than 0.5 psig.
  • Page 8: Gas Piping

    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

    The location of the PRV must be readily accessible for servicing or replacement., and be mounted as close to the water heater as possible. See Fig 7. To install the PRV, a suitable fitting connected to an extension on a “T” fitting can be sweated to the hot water line.
  • Page 10: Setting Water Temperature

    If you do not smell gas, go to the next step. 3. This water heater is equipped with a safety pilot burner and an automatic ignition control system. 4. Set the ON/OFF switch (flip down cover plate on front panel strip) to the “...
  • Page 11: Maintenance & Service

    MAINTENANCE AND SERVICE REVIEW MAINTENANCE TABLE ON THE BACK OF THIS MANUAL. Approximately once a year, the AquaStar should be checked and cleaned. To remove the front cover, first remove the incandescent particle tray, then pull off the temperature adjustment knob and unscrew and remove the plastic collar. Pull main cover out toward you and lift up and out.
  • Page 12 Excessive pressure will lock it up. Locking usually happens when using propane gas if f the gas pressure between the gas tank and the water heater’s gas regulator has not been reduced. See Page 2 for recommended correct gas pressure. To unlock a regulator, consult your gas supplier or call CEC.
  • Page 13 LED indicator main See specifications on page 2. Unlike storage tank water burner condition heaters, the burners of a tankless water heater must be on/off switch hydro-generator very powerful to heat water instantaneously since they do flue gas safety device this only at the time hot water is actually being used.
  • Page 14: Diagram Of Aquastar

    HOT WATER TEMPERATURE FLUCTUATES 1. Unbalanced pressure in waterlines The added restriction caused by the Aquastar in the hot water system can result in uneven pressures between the cold and the hot. In such cases when mixing cold water at the tap, the lower hot water pressure may be overpowered by a much higher cold water pressure, which may cause the Aquastar burners to shut down.
  • Page 15 6 720 606 562 (02.03)
  • Page 16 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST Fig. 15 6 720 606 562 (02.03)
  • Page 17: Interior Components Diagram

    Front cover Temperature adjustment knob comp. Temperature adjustment knob Draught diverter Heat exchanger Temperature limit Main burner Main burner Washer Throttle disc ( 7.0 ) Pilot burner (41.2) Pilot burner Set of electrodes Pilot injector ( 13 ) Pilot injector ( 74 ) Pilot gas pipe Washer Gas valve...
  • Page 18: Installation Checklist

    Nominal Iron Pipe Size* MAXIMUM LENGTH Semi-rigid Tubing MAXIMUM LENGTH * Flex tubing greatly reduces capacity and, therefore, is not recommended. Minimum Vent Size* and Height Minimum Diameter 5 inches * NOTE: Vent size must not be restricted. Installation must comply with national fuel gas code venting requirements for a 117,000 Btu Category I appliance and any applicable local codes.

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125hx ng