Owner manual

ManualsBrandsBosch ManualsWater boiler125B LP

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.

INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC

INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND

LIQUEFIED PETROLEUM GAS

MODEL 125B LP and 125B NG (Flow Modulated)

Suitable for heating potable water only

Not approved for space heating purposes

Intended for variable flow applications with steady cold water inlet temperatures only

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.

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 12

Safety before lighting the pilot .......Page 12

Lighting instructions ..........................Page 13

Setting water temperature ...............Page 13

Maintenance & Service ....................Page 13

Trouble Shooting................................Page 14

Diagram of AquaStar ........................Page 19

Components and Parts List ............ Page 20

Warranty ............................................. Page 22

TABLE OF CONTENTS

6 720 607 030 US (05.12) AL

Summary of content (24 pages)

PAGE 1
I NSTALLATION AND OPERATI NG I NSTR UCTIONS FOR AUTOMATIC INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND LIQUEFIED PETROLEUM GAS MODEL 125B LP and 125B NG (Flow Modulated) Suitable for heating potable water only Not approved for space heating purposes Intended for variable flow applications with steady cold water inlet temperatures only WARNING 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
This well engineered, gas water heater has all the features a water heater should have: 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. The heat exchanger coils absorb the heat generated by the burners and transfer heat to the water.
PAGE 3
FRONT VIEW SIDE VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS MODEL 125B TOP (A) FRONT (B) BACK SIDES FLOOR (C) VENT DIAMETER 12 " 4" 0" 4" 12 " 5" AQUASTAR MODEL 125B 6 720 607 030 3
PAGE 4
GENERAL RULES TO FOLLOW FOR SAFE OPERATION PROPER LOCATION FOR INSTALLING YOUR HEATER 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. Carefully select the location of your new heater.
PAGE 5
Air Vents (10 ¾ X 10 ¾ in. each) 125B Fig. 1 - Water heater drain plug WARNING: Flammable materials, gasoline, pressurized containers, or any other items or articles that are potentially fire hazards must NOT be placed on or adjacent to the heater. The appliance area must be kept free of all combustible materials, gasoline and other flammable vapors and liquids. COMBUSTION AIR REQUIREMENTS The AquaStar water heater holds cold water in its copper heat exchanger and brass water valve when not in use.
PAGE 6
Note: Typically, the minimum clearence to combustible materials should not be less than 6“ for single wall flue pipe. Note that this clearance can be reduced if combustible materials are protected as per table VI of the National Fuel Gas Code or if Type B gas vent is used. 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.
PAGE 7
VENTING Vent pipe connection. WARNING: Do not reduce the vent pipe size. See Fig. 4 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 CHIMNEY: Masonry chimneys shall be built and 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. 6 inch is required in elevations greater than 2000 feet, see Fig. 4. Local codes may require the use of both gas vent and an approved lining system when venting into a masonry chimney.
PAGE 9
To check the draft: Close all doors and windows to the outside. Turn on all appliances that force air out of the building. These include all exhaust/ventilation fans, furnaces, clothes dryers, wood burning stoves, etc. Open all doors between the AquaStar and these other appliances. With the control knob set fully clockwise and strong hot water flow rate, run the unit for at least 10 minutes.
PAGE 10
GAS LINE SIZING GAS CONNECTIONS NOTE: The Aquastar 125 B is supplied with a gas pressure regulator that must be installed on the heater before attaching the gas supply line. See fig. 5. Failure to install the gas regulator as shown in figure 5 will be a violation of CSA certification of the unit. The regulator supplied with the heater is preset for the gas shown on the rating plate to the correct pressure. It is an appliance level regulator designed for (low inlet) pressure (less than 1/ 2 Psig or 15” W.C.
PAGE 11
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. In Canada: The Installation should conform with CGA B149 INSTALLATION CODES and /or local installation codes.
PAGE 12
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” male NPT flex connectors (follow local codes if more stringent).
PAGE 13
LIGHTING INSTRUCTIONS (as seen on front cover of heater) GAS CONTROL SLIDE 1. STOP! Read the safety information above on this plate. 2. The Gas valve must be turned off by sliding the gas valve button to the far left under the OFF ( ) mark. 3. Wait five (5) minutes to clear out any gas. If you smell gas, STOP! Follow “B” in the safety information above on this plate. If you don’t smell gas, go to next step. 4.
PAGE 14
Water Valve (Part # 8707002649): The water valve on this heater should be serviced periodically. Lubricate component #23 on page 19 with a small amount of silicon, faucet or lithium grease every two years to keep its o rings fresh and pushrod sliding smoothly. Every 3-5 years replace component #23 on page 19. The frequency will depend on the mineral content of the water and conditions of use or whenever signs of corrosion appear at the gas and water valve joint.
PAGE 15
PILOT LIGHT WILL NOT LIGHT 1. No gas to the AquaStar A. Gas cock on gas line may not be open. B. Gas valve button has not been moved to single flame position ( ). Slide button to right to PILOT. C. Gas regulator may be shut or damaged. 2. In-line AquaStar gas regulator jammed (usually on LP gas) Replace or unlock the regulator. Note: The regulator furnished with the heater is designed for low gas pressure. Excessive pressure will lock it up (propane only).
PAGE 16
5. Crossover in household plumbing The AquaStar burner activates when there is sufficient water pressure drop in the AquaStar water valve assembly — i.e. when a hot water faucet is opened. If there is a crossover in the plumbing, the necessary pressure drop in the AquaStar will be insufficient, or totally eliminated. A plumbing crossover can be caused by a bad washer at a single lever faucet or incorrect plumbing or a mixing valve in the line, etc. which permits hot and cold water to mix in the plumbing.
PAGE 17
HOT WATER TEMPERATURE FLUCTUATES / UNIT DEACTIVATED 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 the higher cold water pressure in the building, which may cause the Aquastar burners to shut down (deactivate). Do not add any flow restrictor to the shower head.
PAGE 18
6 720 607 030
PAGE 19
Fig. 12 - Diagram of AquaStar 125 B 1 3 2 4 5 6 7 9 8 10 11 13 12 1. 2. 3. 4. 5. 6. 7. 6 720 607 030 Heat exchanger Pilot assembly Burner manifold gas pressure test nipple Main gas burner Pilot gas tubing Gas valve Pressure tap screw location 8. 9. 10. 11. 12. 13. 6720606800-07.
PAGE 20
Fig.
PAGE 21
Fig.
PAGE 22
LIMITED WARRANTY Aquastar 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. The BBTNA replacement will be warranted for the unexpired portion of the original warranty.
PAGE 23
Fig.
PAGE 24
MAIN TEN AN C E TAB LE see pages 13 & 14 EVERY YEAR EVERY 2 YEAR S EVERY 3-5 YEAR S † LU B R IC ATE WATER VALVE † R EB U ILD WATER VALVE IN SPEC T WATER FILTER SC R EEN † IN SPEC T PILOT ASSEMB LY † IN SPEC T VEN T ASSEMB LY † IN SPEC T MAIN B U R N ER † 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.