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
MODEL 125B LPS and 125B NGS (Thermostatically Modulated)
Intended for domestic hot water with preheated inlet water as with solar hot water.
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.
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.
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 6
Venting the Heater ........................................................ Page 7
Gas Connections ....................................................... Page 10
Water Connections .................................................... Page 11
Safety before lighting the pilot ................................ Page 12
Lighting instructions ................................................... Page 12
Information on water temperature ........................... Page 13
Trouble Shooting ......................................................... Page 14
Diagram of AquaStar .................................................. Page 17
Components and Parts List ...................................... Page 19
Warranty ....................................................................... Page 21
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Related Manuals for Bosch 125B NGS
Summary of Contents for Bosch 125B NGS
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Page 1: Table Of Contents
I NSTALLATION AND OPERATI NG I NSTR UCTIONS 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. -
Page 2: Specifications
It operates on the principle of heating water instantaneously “on demand”. When a hot water faucet is opened, cold water flows through the coils of the heat exchanger in the Aquastar. This same flow opens the gas valve, and the burners are ignited by the pilot flame. - Page 3 COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS 6 720 606 518 TOP (A) FRONT (B) BACK SIDES FLOOR (C) VENT DIAMETER AQUASTAR MODEL 125BS SIDE VIEW MODEL 125BS 12 " 4 " 0 " 4 " 12 " 5 "...
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Page 4: Rules For Safe Operation
Confirm that your Aquastar is venting properly when all these other appliances are running. See section on venting. -
Page 5: Combustion Air Requirements
A wood stove or furnace can rob the make- up air in the AquaStar’s vent pipe, leaving the cold infiltrating air capable of freezing the cold water in the AquaStar heat exchanger. -
Page 6: Mounting The Heater
MOUNTING INSTALLATION The Aquastar 125 B “S” is design certified for mounting on a wall. Secure the two L shaped hooks provided with the heater to a wall surface. Place them 13 ¼ inches apart as shown in Fig 1. Do not install this appliance on a carpeted wall or over floor covering which is combustible, such as carpet. -
Page 7: Venting The Heater
VENTING Vent pipe connection. WARNING: Do not reduce the vent pipe size. See Fig. 3 for high altitude installations The heater must be vented to the outside following all local ordinances and specifications for installing a gas appliance vent or chimney. The heater must be located as close as practicable to a vertically rising chimney or vent that has a listed vent cap at its termination point. - Page 8 : Masonry chimneys shall be built and installed in accordance with NFPS 211 or local codes. A MASONRY CHIMNEY 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 WARNING Note: The burners of an instantaneous “on demand” water heater such as the AquaStar are only on at the time that hot water is actually being used, the vent pipe is therefore cold except for the short durations when hot water is being...
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Page 10: Gas Connections
GAS CONNECTIONS and Gas Regulator NOTE: The Aquastar 125 B”S” is supplied with a gas pressure regulator that must be installed on the heater before attaching the gas supply line. See figure 5. Failure to install the gas regulator as shown in figure 5 will be a violation of CSA certification of the unit. -
Page 11: Water Connections
-It is strongly recommended that the Natural Gas pipe be Black Iron pipe the entire distance from the outside meter to the inlet of the Aquastar regulator. 1/2” Black Iron pipe up to 10 feet, 3/4” Black Iron pipe up to 40 feet and 1”... -
Page 12: Safety Before Lighting The Pilot
Connecting the pressure relief valve (PRV) A listed pressure relief valve supplied with the heater must be installed at the time of installation. No valve is to be placed between the PRV and the heater. No reducing coupling or other restriction may be installed in the discharge line. -
Page 13: Information On Water Temperature
INFORMATION ABOUT WATER TEMPERATURE The AquaStar 125B LPS and 125B NGS water heaters have a gas control that modulates burner output in response to water flow. Its purpose is to ensure that the hot water temperature will remain steady, although the water flow demand might vary (down to 1/2 gal/minute). -
Page 14: Trouble Shooting
TROUBLE SHOOTING (see maintenance table) Introduction The AquaStar 125 B “S” burners are activated by a water flow valve. Numerous water related problems can cause this water valve to malfunction such as: Insufficient water flow volume to activate the burners at its minimum flow requirement;... - Page 15 The crossover will create a back pressure in the system preventing the pressure drop in the Aquastar — i.e. cold water is entering the water heater from both sides and the burners will not come on.
- Page 16 AquaStar and the outlet Compare water temperature at outlet of the AquaStar (hold the AquaStar’s outlet pipe with your hand) and at the tap. If these two are very different, check for mixing valve or plumbing crossover (see “MAIN BURNERS WILL NOT IGNITE...”...
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Page 17: Diagram Of Aquastar
Pilot assembly Burner manifold gas pressure test nipple Main gas burner Pilot gas tubing 6 720 606 518 Fig. 10 - Diagram of AquaStar 125 BS Gas valve Piezo igniter Location of pressure tap screw Water valve Gas inlet gas pressure... - Page 18 AQ 125 BS Fig. 11 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 6 720 606 518...
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Page 19: Components And Parts List
Cover Cap cover Water connection gasket Draft divertor Heat exchanger Hot water pipe Cold water pipe Heat exchanger washer Overheat sensor (ECO) Main burner assembly Main burner assembly Pilot burner assembly Pilot filter screen Piezo electrode Pilot orifice Pilot orifice Pilot Tube Thermocouple Burner assembly washer... - Page 20 - Flow chart of Aquastar 125 BS Fig. 12 6 720 606 518...
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Page 21: Warranty
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 6 720 606 518...
- Page 23 6 720 606 518...
- Page 24 Replacement Parts available: BBT NORTH AMERICA Bosch Group Bosch Water heating 340 Mad River Park Waitsfield, Vermont 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 ©...