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Bosch 38B LP Installation And Operating Instructions Manual

Automatic instantaneous type water heaters for use with natural and liquefied petroleum gas
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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 low flow domestic hot water 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 38B LP and NG
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 7
Gas Connections .......................................................... Page 9
Water Connections .................................................... Page 10
Safety before lighting the pilot ................................ Page 11
Lighting instructions ................................................... Page 11
Setting water temperature ........................................ Page 12
Maintenance & Service ............................................. Page 12
Trouble Shooting ......................................................... Page 13
Diagram of AquaStar ................................................. Page 16
Components and Parts List ...................................... Page 19

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  Summary of Contents for Bosch 38B LP

  • 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 38B LP and NG Suitable for heating potable water only Not approved for space heating purposes Intended for low flow domestic hot water applications with steady cold water inlet temperatures...
  • Page 2: Specifications

    This well engineered, gas water heater has all the fea- AquaStar 38B LP and 38B NG Specifications tures 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 Gas Input max.: 40,000 Btu/hr...
  • Page 3 FRONT VIEW SIDE VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS MODEL 38B TOP (A) 12 " FRONT (B) 4 " BACK 0 " SIDES 4 " FLOOR (C) 12 " VENT DIAMETER 4 " AQUASTAR MODEL 38B 6 720 606 446...
  • Page 4: Rules For Safe Operation

    Follow the guidelines below: GENERAL RULES TO FOLLOW FOR SAFE OPERATION 1. Place your heater as close to a vent or chimney as possible. 1. You should follow these instructions when you install your heater. In the United States: The installation must conform 2.
  • Page 5: Combustion Air Requirements

    COMBUSTION AIR REQUIREMENT CLEARANCES The AquaStar water heater holds cold water in its copper The Aquastar 38 B is design certified for installation on a heat exchanger and brass water valve when not in use. combustible wall and for installation in an alcove or closet Because of this, any cold air that comes in through the with the minimum clearances to combustible and non - unit’s vent pipe is capable of freezing these components.
  • Page 6 Appliances located in unconfined spaces: a) An unconfined space is one whose volume is greater than 50 cubic feet per 1000 Btu per hour of the combined rating of all appliances installed in the space. That would be 2000 cubic feet for the AquaStar 38B alone. b) In unconfined spaces in buildings of conventional frame, masonry, or metal construction, infiltration is normally adequate to provide air for combustion, ventilation, and...
  • Page 7: Venting The Heater

    VENTING Vent pipe connection. WARNING: Do not reduce the vent pipe size. 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 4” 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

    To check the draft: Close all doors and windows to the outside. GAS CONNECTIONS Turn on all appliances that force air out of the building. and Gas Regulator These include all exhaust/ventilation fans, furnaces, clothes dryers, wood burning stoves, etc. Before connecting the gas supply, check the rating plate on Open all doors between the AquaStar and these other the right side of the front cover to be sure that the heater is...
  • Page 10: Water Connections

    MAXIMUM INLET GAS FLOW PRESSURE SETTING WATER CONNECTIONS Altitude Natural Gas Liquid Propane inches W.C: inches W.C: Install the heater centrally in the building if possible and 0' - 2.000 ft 5.7" 10.5" make hot water piping runs as short as possible When facing 2.000 ft - 4.500 ft 4.6"...
  • Page 11: Safety Before Lighting The Pilot

    - 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. C. Use only your hand to push in or turn the gas control buttons.
  • Page 12: Setting Water Temperature

    Pilot Flame: The pilot flame should burn with a clean sharp SETTING THE WATER TEMPERATURE blue flame and should resemble the diagram in Fig 7. If the To adjust the temperature on your AquaStar, turn on a hot flame is yellow, or if the pilot knob has to remain depressed water faucet to its maximum flow.At the water heater, turn for a long time in order to keep the pilot lighted, the pilot the large temperature adjustment knob located beneath the...
  • Page 13: Trouble Shooting

    PILOT DOES 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 “PILOT POSITION”. Slide button to right to single flame position AIR SCREEN 2.
  • Page 14 PILOT LIGHTS BUT FLAME GOES OUT WHEN BUTTON BURNERS DO NOT IGNITE WHEN HOT WATER IS TURNED IS RELEASED 1. Pilot push button was not pushed in far enough or 1. Pilot is not on. was not held in long enough Light the pilot.
  • Page 15 PILOT LIGHT GOES OUT DURING OR IMMEDIATELY 4. Btu input is too low due to insufficient gas supply AFTER HOT WATER HAS BEEN USED Make sure your main gas line is fully opened. If using LP gas, be sure that the size of the propane tank is adequate to 1.
  • Page 16: Diagram Of Aquastar

    Fig. 9 - Diagram of AquaStar 38 B Heat exchanger Inlet gas pressure test nipple Pilot assembly Gas valve Burner manifold gas Gas control slide pressure test nipple Piezo igniter Pilot gas tubing Temperature adjustment knob Main gas burner Water valve 6 720 606 446...
  • Page 17 6 720 606 446...
  • Page 18 Fig. 10 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 6 720 606 446...
  • Page 19: Components And Parts List

    Fig. 10 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 38B Cover 8 705 421 021 Temperature adjustment knob 8 702 000 182 Draft divertor 8 705 505 361 Heat exchanger 8 705 406 149 Overheat sensor (ECO) 8 707 206 040 Hot water pipe 8 700 703 038 Main burner assembly...
  • Page 20 - Flow chart of Aquastar 38 B Fig. 11 6 720 606 446...
  • Page 21: Limited Warranty

    Aquastar water heaters are warranted by the Manufacturer This warranty does not cover any labor costs associated (BOSCH) through BBT North America. BBT North America with service, removal or re-installation of part(s). All such (BBTNA) will furnish a replacement heat exchanger and will costs must be borne by the Purchaser.
  • Page 22 6 720 606 446...
  • Page 23 6 720 606 446...
  • Page 24 † † † † † Replacement Parts available from: BBT NORTH AMERICA Bosch Group Bosch Water Heating Bosch Heating 340 Mad River Park System Co. Foschan Guangdong Waitsfield, VT 05673 C. T. 528315 P.R. China Phone 800-642-3111 Fax (802) 496-6924 www.boschhotwater.com...

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38b ng