Bosch AquaStar 125HX LP Installation And Operating Instructions Manual
Automatic instantaneous type water heaters for use with natural and liquefied petroleum gas
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Table of Contents
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I NSTALLATION AND OPERATI NG I NSTR UCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS
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 or gas fitter.
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 3
Rules for safe operation ........................................................... Page 5
Locating the Heater .................................................................. Page 5
Combustion Air Requirements ............................................... Page 6
Mounting the Heater ................................................................. Page 6
Venting the Heater ..................................................................... Page 7
Gas Connections ...................................................................... Page 9
Gas Piping ................................................................................ Page 10
Water Connections ................................................................. Page 11
Safety before turning on the heater ..................................... Page 11
Operating instructions ........................................................... Page 12
Setting water temperature .................................................... Page 12
Maintenance & Service ........................................................... Page 13
Trouble Shooting ..................................................................... Page 13
Electrical Diagram .................................................................... Page 15
Diagram of 125HX .................................................................. Page 17
Interior components diagram ............................................... Page 18
Parts List ................................................................................... Page 19
Flowchart ................................................................................. Page 20
Warranty .................................................................................... Page 21
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Summary of Contents for Bosch AquaStar 125HX LP
- Page 1 In the Commonwealth of Massachusetts this product must be installed by a licensed plumber or gas fitter. MODEL 125HX LP and 125HX NG (Flow Modulated with Electronic Ignition) If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.
-
Page 2: For Your Safety
WARNING Improper 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. -
Page 3: Specifications
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. -
Page 4: Front View
FRONT VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS TOP (A) FRONT (B) BACK SIDES FLOOR (C) VENT DIAMETER MODEL 125HX SIDE VIEW MODEL 125 HX 12" 4" 0" 4" 12" 5" 6 720 606 804... -
Page 5: General Rules To Follow For Safe Operation
GENERAL RULES TO FOLLOW FOR SAFE OPERATION 1. You should follow these instructions when you install your heater. 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. In Canada: The Installation should conform with CGA B149.(1,2) INSTALLATION CODES and /or local installation codes. -
Page 6: Combustion Air Requirements
50 cubic feet per 1000 Btu per hour of the combined rating of all appliances installed in the space. That would be 5850 cubic feet for the AquaStar 125HX alone. b) In unconfined spaces in buildings of conventional frame,... -
Page 7: Mounting The Heater
plasterboard, can cause failure of mounting. In earthquake-prone zones, BBTNA recommends that installers use a large washer and lag screw through the existing holes used to hang the heater to affix the upper third of the heater to the mounting board. To affix the lower third of the heater, BBTNA recommends that two new holes be drilled in the heater’s frame, each one 16 inches below the top two holes, and that washers and lag screws be used... -
Page 8: Masonry Chimneys
: Masonry chimneys shall be built and MASONRY CHIMNEY installed in accordance with NFPS 211 or local codes. A minimum 5” diameter gas vent pipe (metal double wall Type B), or an approved clay flue liner or a listed chimney lining system must be used when venting into a naturally drafting, internal masonry chimney. -
Page 9: Gas Connections
draft diverter outlet must be connected to an unobstructed vent of the same size, or larger. In Canada, CAN/CGA-B149 Installation Code for detailed requirements In U.S.A., ANSI Z223. 1 - NFPA 54, National Fuel Gas Code for detailed requirements. The vent connection for the 125 HX is 5 inches. However, for installations at high altitude (over 2000 feet above sea level) a six inch vent is required. -
Page 10: Gas Piping, Connections And Gas Regulator
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. -
Page 11: Water Connections
WATER CONNECTIONS Install the heater centrally in the building if possible and make hot water piping runs as short as possible When facing the heater, the cold water inlet will be on the right and the hot water outlet on the left. Although water piping throughout the building may be other than copper, copper or galvanized piping should be used when connecting to the heaters ½”... -
Page 12: Setting The Water Temperature
LIGHTING AND OPERATING INSTRUCTIONS 1. STOP! Read the safety information above on this label. 2. The gas valve must be shut off by putting the ON/OFF switch to position “ ”. Wait five (5) minutes to clear out any gas. If you smell gas, STOP! Follow “B” in the safety information above. -
Page 13: Maintenance And Service
Consult your service person. TROUBLE SHOOTING Introduction The AquaStar 125 HX burners are activated by a water flow valve. Numerous water related problems can cause this water valve to malfunction such as: Insufficient water Flame sensor flow volume to activate the burners at its minimum flow requirement;... -
Page 14: No Spark At The Pilot
Problems are stated in upper case, bold face. Most common causes for the problems follow in order of likelihood. The suggested solutions require that the cover be taken off. To do this, remove incandescent particle tray, pull off the temperature adjustment knob and unscrew and remove the plastic collar. - Page 15 PILOT LIGHTS BUT BURNERS WILL NOT COME ON 1. Confirm water valve assembly is working properly. See Water Valve under MAINTENANCE AND SERVICE. 2. Confirm the flame sensor is in its proper position and clean, lightly wipe clean if dirty. See Fig. 10 3.
- Page 16 HOT WATER TEMPERATURE FLUCTUATES / UNIT DEACTIVATED 1. Unbalanced pressure in waterlines The added restriction caused by the 125 HX 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 125 HX burners to shut down.
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Page 17: Diagram Of 125Hx
1. Heat exchanger 2. Pilot assembly 3. Burner manifold gas 4. Main gas burner 5. Pilot gas tubing 6. LED failure indicator 6 720 606 804 Diagram of 125 HX Fig. 14 - 7. on/off switch 8. LED operation indicator 9. -
Page 18: Interior Components Diagram
- INTERIOR COMPONENTS DIAGRAM AND PARTS LIST Fig. 15 6 720 606 804... -
Page 19: Parts List
Cover Temperature adjustment knob Temperature adjustment collar Draft diverter Heat exchanger Main burner Main burner Burner assembly washer Throttle disc Pilot burner Pilot burner Pilot electrode Pilot orifice Pilot orifice Pilot tube Washer pilot tube Gas valve Gas valve Diaphragm switch Diaphragm switch Pilot electrovalve Burner electrovalve... -
Page 20: Flowchart
- Flow chart of 125 HX Fig. 16 6 720 606 804... -
Page 21: Warranty
Twelve Year Limited Warranty General Aquastar water heaters are warranted by the Manufacturer (BOSCH) through BBT North America. BBT North America (BBTNA) will furnish a replacement heat exchanger and will furnish a replacement of any other part which fails in normal use and service within the applicable periods specified below, in accordance with the terms of this warranty. - Page 22 6 720 606 804...
- Page 23 6 720 606 804...
- Page 24 Replacement Parts available from: BBT NORTH AMERICA Bosch Group Bosch Water Heating 340 Mad River Park Waitsfield, VT 05673 Phone 800-642-3111 Fax (802) 496-6924 www.boschhotwater.com techsupport@boschhotwater.com Recycled paper † † † † † † VULCANO Termodomésticos S.A. Estrada de Cacia 3801 - 856 Aveiro - PORTUGAL ©...