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Bosch 38B LP Installation And Operating Instructions Manual

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INSTALLATION AND OPERATING INSTRUCTIONS 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.
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 6
Gas Connections ............................................... Page 6
Water Connections ............................................ Page 7
Safety before lighting the pilot ............................ Page 8
Lighting instructions ........................................... Page 8
Setting water temperature .................................. Page 9
Maintenance & Service ....................................... Page 9
Trouble Shooting .............................................. Page 10
Diagram of AquaStar ......................................... Page 13
Components and Parts List .............................. Page 14

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  Summary of Contents for Bosch 38B LP

  • Page 1: Table Of Contents

    INSTALLATION AND OPERATING INSTRUCTIONS 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 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 " * Some local codes require 18” in garage installations AQUASTAR MODEL 38B...
  • Page 4: Rules For Safe Operation

    GENERAL RULES TO FOLLOW The heater may still operate even when improperly vented. It will, however, be less efficient and could eventually FOR SAFE OPERATION damage the heater. It could even result in human sickness or death due to oxygen deprivation and carbon monoxide 1.
  • Page 5: Combustion Air Requirements

    This product is not approved for manufactured homes CLEARANCES (mobile home), recreational vehicles (RV) or boats. Reference ANSI Z21.10.3. The Aquastar 38 B is design certified for installation on a This product is neither designed or approved for combustible wall and for installation in an alcove or closet outside installations.
  • Page 6: Venting The Heater

    Appliances located in unconfined spaces: To check the draft: a) An unconfined space is one whose volume is greater Close all doors and windows to the outside. than 50 cubic feet per 1000 Btu per hour of the combined Turn on all appliances that force air out of the building. rating of all appliances installed in the space.
  • Page 7: Water Connections

    the supply system, the gas valve and regulator must be INLET GAS FITTTING checked for safe operation. WITH GASKET Make sure that the regulator vent is protected against blockage. When your connections are made, check for gas leaks at all joints (not just the ones you made). Apply some soapy PRESSURE TAP water to all gas fittings and gas valve.
  • Page 8: 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 9: Setting Water Temperature

    SETTING THE WATER TEMPERATURE Pilot Flame: The pilot flame should burn with a clean sharp 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...
  • Page 10: 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 11 PILOT LIGHTS BUT FLAME GOES OUT WHEN BUTTON BURNERS DO NOT IGNITE WHEN HOT WATER IS IS RELEASED TURNED ON 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 12 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 1.
  • Page 13: 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...
  • Page 14: Components And Parts List

    Fig. 10 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST...
  • Page 15 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) ¤...
  • Page 16: Installation Checklist

    INSTALLATION CHECKLIST GAS LINE SIZE Natural Gas Nominal Iron Pipe Size* 3/8" 1/2" MAXIMUM LENGTH Liquid Propane Semi-rigid Tubing 3/8" 1/2" MAXIMUM LENGTH * Flex tubing greatly reduces capacity and, therefore, is not recommended. Minimum Vent Size* and Height Minimum Diameter Minimum Height** 4 inches 6 feet**...

This manual is also suitable for:

38b ng