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Bosch 330-PN-N Installation Manual

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INDOOR MODEL Flow Modulated with Standing pilot
330 PN
330-PN-N - for use with Natural Gas / 330-PN-L - for use with Liquefied Petroleum (LP) Gas
Suitable for heating potable water only - Not approved for space heating purposes
(Intended for variable flow applications with steady cold water inlet temperatures)
If the information in this manual is not followed exactly, a fire or
explosion may result causing property damage, personal injury or death.
Do not store or use gasoline or other flammable vapor and liquids in the vicinity
of this or any other appliance.
Improper installation, adjustment, alteration, service or maintenance can
cause injury or property damage. Refer to this manual. For assistance or addi-
tional information consult a qualified installer, service agency or the gas sup-
plier. In the Commonwealth of Massachusetts this product must be installed
by a licensed plumber or gas fitter.
Upon completion of the installation, these instructions should be handed to
the user of the appliance for future reference.
What to do if you smell gas
Close gas valve. Open windows.
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, ser-
vice agency or the gas supplier



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  Summary of Contents for Bosch 330-PN-N

  • Page 1 INDOOR MODEL Flow Modulated with Standing pilot 330 PN 330-PN-N - for use with Natural Gas / 330-PN-L - for use with Liquefied Petroleum (LP) Gas Suitable for heating potable water only - Not approved for space heating purposes (Intended for variable flow applications with steady cold water inlet temperatures)
  • Page 2: Table Of Contents

    4.8 Measuring gas pressure ....19 10 LIFETIME LIMITED WARRANTY FOR BOSCH 4.9 Water connections......19 TANKLESS WATER HEATERS .
  • Page 3: Key To Symbols And Safety Instructions

    Key to symbols and safety instructions | 3 Installation and servicing Key to symbols and safety instructions ▶ Risk of fire when soldering and brazing! Take appropriate protective measures when soldering and Key to symbols brazing around combustible and flammable material. ▶...
  • Page 4 ▶ immediately correct all faults to prevent system damage. temperature and pressure! Installation of a T&P safety ▶ use only bosch spare parts! damage caused by the use of valve is required. parts not supplied by bosch may void the warranty.
  • Page 5 Key to symbols and safety instructions | 5 Flooding DANGER: Electric shock! ▶ After a flood, do not use the appliance if any part has been Shock hazard: line voltage is present. submerged. Damage to appliances that have been submerged can be quite severe and pose numerous safety ▶...
  • Page 6: Warning

    6 | Warning WARNING: Fire danger! WARNING: Personal Injury from toxic chemicals. ▶ Keep appliance area clear and free from combustible materials, gasoline and ▶ Toxic chemicals, such as those used for other flammable vapors and liquids. boiler treatment, shall not be introduced into the potable water used for space heating.
  • Page 7: Appliance Details

    2) Activation varies with inlet water temperatures from 0.5 - (kW) 1.6 gallon/minute (1.9 - 6.1 l/m). Thermal efficiency > 78% (Efficiency in %) Accessories (Bosch part #) Minimum Input BTU/hr 30 735 Btu/hr • Pressure relief valve (FWL-2) (kW)
  • Page 8: Unpacking The 330 Pn Heater

    • Installation manual • Incandescent particle tray BOSCH is constantly improving its products, therefore specifications are subject to Do not lose this manual, there is a charge for a replacement. change without prior notice. Please complete and return the enclosed product registration card.
  • Page 9: Dimensions And Installation Clearances

    Appliance details | 9 Dimensions and installation clearances Fig. 3 Dimensions in Inches and (mm) [4] Heat exchanger [37] Hole for fixing to wall [5] Burner [38] Exhaust pipe to connector [10] Temperature control [39] Draft diverter with flue gas monitor [11] Water valve [40] Gas valve [20] Gas connection...
  • Page 10: Installation Instructions

    WARNING: gas technician. Please contact Bosch Water Heating with any questions. ▶ Place the heater in a location where water leaks will do NO DAMAGE to Proper location for installing your heater adjacent areas.
  • Page 11: Heater Placement And Clearances

    Installation instructions | 11 Heater placement and clearances ▶ Install incandenscent particle tray using screws provided as shown in Fig. 5. The 330 PN is design certified for installation on a combustible wall (see 4.4 Mounting installation) provided the wall is not covered with carpet or other fabric material.
  • Page 12: Combustion Air Requirements

    Refer to the National Fuel Gas Code for Combustion air requirements complete information. In buildings of tight construction all air The BOSCH PRO water heater holds cold water in its copper should be taken from outside. heat exchanger and water valve when not in use. Because of this, any cold air that comes down through the unit's vent pipe is capable of freezing these components.
  • Page 13: Venting

    Installation instructions | 13 Venting ▶ All gas vent sections must be secured to each other with sheet metal screws and be properly supported. DANGER: Horizontal runs: ▶ Do not reduce the vent pipe size. Any gas vent section that is greater than 45 degrees from the ▶...
  • Page 14 14 | Installation instructions 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. Local codes may require the use of both gas vent and an approved lining system when venting into a masonry chimney.
  • Page 15: Gas Piping & Connections

    Installation instructions | 15 Fig. 12 Installation of Gas Pressure Regulator Note: The 330 PN comes with a gas pressure regulator. Failure to install or altering the gas pressure regulator 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.
  • Page 16 16 | Installation instructions When connections are made, check for gas leaks at all joints. Apply some gas leak detection solution to all gas fittings. Bubbles are a sign of a leak. A combustible gas detector may also be used to detect for leaks. DANGER: ▶...
  • Page 17 Installation instructions | 17 GAS LINE SIZING The gas supply piping should be sized according to the drawing on the same line, size the gas line according to the total applicable code for a maximum draw of 74,900 BTUH. maximum amount of BTU draw for all appliances. Measure the length of gas supply line and use the tables in Note: Under sizing the gas line may result in diminished output page 17 or the gas line manufacturer’s sizing tables to...
  • Page 18 18 | Installation instructions Lenght of Flexible Corrugated Stainless Steel Tubing (CSST), Feet Tube size inches EHD* 1 - 1/4 Table 9 * EHD = Equivalent Hydraulic Diameter. The greater the value EHD, the greater the gas capacity of the tubing. Black Iron Pipe Nominal Lenght of pipe, Feet...
  • Page 19: Measuring Gas Pressure

    Installation instructions | 19 Measuring gas pressure Water connections When facing the heater, the ½ ” cold water inlet is on the bottom Connecting manometer right and the hot water outlet is on the bottom left. ▶ Shut off gas. ▶...
  • Page 20: 4.10 Recirculation Application

    A. This appliance employs a piezo-igniter to light the pilot application using the BOSCH PRO water heater with an Ariston burner. When lighting the pilot, follow these instructions minitank. This schematic is for illustration only and must not be exactly.
  • Page 21: Lighting Instructions

    Operation instructions | 21 appliance and to replace any part of the control system and any ▶ Fully depress gas valve button. gas control which has been under water. Lighting instructions ▶ STOP! Read the previous safety information. ▶ The gas valve must be turned off by sliding the gas valve button to all the way to the left.
  • Page 22: To Turn Off Appliance

    22 | Operation instructions To turn off appliance Counter- ▶ Slide the gas valve button all the way to the left and turn off Knob position Clockwise clockwise the installer supplied manual gas shutoff on the supply line Degree rise 90 °F 45 °F to the heater.
  • Page 23: Draining Water From Heater

    5 years depending on water quality and usage. The parts list ▶ Inspect inlet water filter screen ( 6.2) and instructions can be found on our website at ▶ Inspect pilot assembly and flame ( 6.3) Failure to rebuild the water valve can result in ▶...
  • Page 24: Main Burners

    24 | Maintenance and service Cleaning pilot assembly 5. Connect the line (A) from the outlet of the circulating pump (installer supplied) to the inlet water fitting on the water heater. Shut off gas supply to the heater using installer supplied manual gas shutoff.
  • Page 25: Troubleshooting

    5. Have a licensed gas technician verify the proper operation of steps as outlined below. Visit our web site at the thermocouple by measuring the millivoltage from the for more detailed troubleshooting. For best results, thermocouple lead to ground.
  • Page 26: Burners Do Not Light With Water Flow

    If the problem persists, go to 8. If steps 1 through 7 do not correct the problem, then confirm for a more detailed service bulletin on this problem.
  • Page 27: Water Is Too Hot

    5. If water is still too hot, consult service bulletins on Open cold supply and measure flow rate out of the unit. With to lower outlet temperatures further. temperature adjustment knob set all the way clockwise, the 6. If the water has a high mineral content, the heat exchanger flow rate should be close to 2gpm, filling the jug in 15 seconds.
  • Page 28: 7.11 Noise When Heater Is Running

    1. Confirm adequate flow rate through the unit. With cold accessed and brushed or vacuumed clean. Instructions to remove burners are available at supply shut off to the unit, disconnect hot outlet side to the unit. Place a half gallon jug under hot outlet to catch water.
  • Page 29: Interior Components And Diagram Parts List

    Interior components and diagram parts list | 29 Interior components and diagram parts list Interior components Fig. 26 Functional scheme [4] Heat exchanger [26] Gas control slide [5] Burner [30] Pilot gas tubing [10] Temperature adjustment selector [102]Piezo [11] Water valve [20] Gas connection [22] Flexible hot outlet 330 PN...
  • Page 30: Components Diagram

    30 | Interior components and diagram parts list Components diagram Fig. 27 Components Diagram 6 720 644 951 (2014/11) 330 PN...
  • Page 31: Parts List

    Interior components and diagram parts list | 31 Parts list Item Description Reference Piezo igniter 8 708 108 051 0 Item Description Reference Front cover 8 738 708 495 Fixing bracket 8 701 302 181 0 Shield 8 738 708 497 Ignition lead 8 704 401 040 0 Temp.
  • Page 32: Lifetime Limited Warranty For Bosch Tankless Water Heaters

    32 | LIFETIME LIMITED WARRANTY FOR BOSCH TANKLESS WATER HEATERS LIFETIME LIMITED WARRANTY FOR BOSCH TANKLESS WATER HEATERS MODELS COVERED 3. The workmanship of any installer. BTC disclaims and does not assume any liability of any nature for unsatisfactory This limited warranty is provided by Bosch Thermotechnology performance caused by improper installation, repair or Corp.
  • Page 34: Installer Checklist To Be Completed By Installer

    34 | Installer Checklist to be completed by installer upon installation Installer Checklist to be completed by installer upon installation Serial Number ___ ___ ___ ___ ___ ___ ___ ___ (8 digit serial number is located on rating plate on right side panel) Gas Pressure Reading Static...
  • Page 35 | 35 Notes 330 PN 6 720 644 951 (2014/11)

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