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Bosch 125HX NG manual

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Table of contents for the manual

  • Page 1

    W ARNING : Improper inst allation, 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 applian[...]

  • Page 2

    2 6 720 606 804 (02.10) Principle of Operation: When a hot water faucet is opened, the water flow through the heater causes the gas valve to open. At the same time the hydro-generator activates the electronics which sends a spark to the pilot. The flame sensor confirms the pilot has been lighted and allows the first two burners to come on. The flam[...]

  • Page 3

    3 6 720 606 804 (02.10) MINIMUM INST ALLA TION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MA TERIALS FOR ALCOVE OR CLOSET INST ALLA TIONS FRONT VIEW SIDE VIEW AQUAST AR MODEL 125HX MODEL 125 HX TOP ( A) 12" FRONT (B) 4" BACK 0" SIDES 4" FLOOR (C) 12" * VENT D IAMETER 5" * Some local codes require 18” in garage i[...]

  • Page 4

    4 6 720 606 804 (02.10) GENERAL RULES TO FOLLOW FOR SAFE OPERA TION 1. Y ou should follow these instructions when you install your heater . In the United S tates: The installation must conform with local codes or , in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFP A 54. In Canada: The Installation should conform with CGA B14[...]

  • Page 5

    5 6 720 606 804 (02.10) Louvers, grills and screens have a blocking effect. If the effective free area is not known, increase the sizes of your openings by 75% if your louvers are wood and by 30% if your louvers are metal. Refer to the National Fuel Gas Code for complete information. In buildings of tight construction all air should be taken from o[...]

  • Page 6

    6 6 720 606 804 (02.10) Fig. 2 - Incandescent Particle T ray Illustration at least 1/4 inch for every foot of its horizontal length. Keep the horizontal section short and avoid too many elbows. T o 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/ventil[...]

  • Page 7

    7 6 720 606 804 (02.10) GAS CONNECTIONS and Gas Regulator NOTE: The Aquastar 125 HX is supplied with a gas pressure regulator that must be installed on the heater before attaching the gas supply line. See figure 4. Failure to install the gas regulator as shown in figure 4 will be a violation of CSA certification of the unit. The regulator supplied [...]

  • Page 8

    8 6 720 606 804 (02.10) Nominal Iron P ipe Black Iron Pipe Size , Length of Pipe, Fee t Inches 10 20 30 40 50 60 70 80 90 100 125 150 1/2 275 189 152 129 114 1 03 96 89 83 78 69 63 3/4 567 693 315 267 237 2 17 196 185 173 162 146 132 1 107 732 590 504 448 409 378 346 322 307 275 252 1 1/4 220 149 121 103 913 834 771 724 677 630 567 511 1 1/2 330 22[...]

  • Page 9

    9 6 720 606 804 (02.10) OPERA TING INSTRUCTIONS Before proceeding with the operation of the heater make sure that the system is filled with water . Open the cold water inlet supply to the heater fully . Open a hot water faucet to permit the water to fill the heater and the piping and to eliminate the air trapped in the system Close the hot water fa[...]

  • Page 10

    10 6 720 606 804 (02.10) The position you select on the temperature adjustment knob will depend on the temperature of the incoming water (50 ° F is average in the U.S.). In warm weather regions where the incoming cold water is generally warmer , or during the hot weather months in some other areas a midway setting on the temperature adjustment kno[...]

  • Page 11

    11 6 720 606 804 (02.10) Fig. 10 - Characteristic Pilot Flame (Pilot assembly shown without pilot hood) MAINTENANCE AND SERVICE REVIEW MAINTENANCE T ABLE ON THE BACK OF THIS MANUAL. Approximately once a year , the AquaS tar should be checked and cleaned. T o remove the front cover , first remove the incandescent particle tray , then pull off the te[...]

  • Page 12

    12 6 720 606 804 (02.10) Problems are stated in upper case, bold face. Most common causes for the problems follow in order of likelihood. The suggested solutions require that the cover be taken of f. T o do this, remove incandescent particle tray , pull off the temperature adjustment knob and unscrew and remove the plastic collar . Pull main cover [...]

  • Page 13

    13 6 720 606 804 (02.10) Fig. 13 - Electrical wiring diagram 5. Flue gas safety device tripped V entilate the room and re-ignite the appliance 10 minutes later . If it happens again, contact your service person or Controlled Energy .. WA TER IS TOO HOT 1 . T emperature Selection too high T urn the temperature adjustment knob counter-clockwise (to t[...]

  • Page 14

    14 6 720 606 804 (02.10) HOT W A TER TEMPERA TURE FLUCTUA TES 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 a much higher cold wa[...]

  • Page 15

    15 6 720 606 804 (02.10) Fig. 14 - Diagram of AquaS tar 125 HX 1. Heat exchanger 2. Pilot assembly 3. Burner manifold gas pressure test nipple 4. Main gas burner 5. Pilot gas tubing 6. LED failure indicator 7. on/off switch 8. LED operation indicator 9. Water valve 10. T emperature adjustment selector 1 1. Gas inlet gas pressure test nipple 1 2 . H[...]

  • Page 16

    16 6 720 606 804 (02.10) Fig. 15 - INTERIOR COMPONENTS DIAGRAM AND P ARTS LIST[...]

  • Page 17

    17 6 720 606 804 (02.10) Fig. 15 INTERIOR COMPONENTS DIAGRAM AND P ARTS LIST 125HX 1 Cover 8 705 421 752 2 Tem perature adjus tment k nob 8 702 000 111 3 Tem perature adjus tment c ollar 8 700 403 008 4 Draft diver ter 8 705 505 354 5 Heat exchanger 8 705 406 235 7 Main burner 8 708 120 298 NG 7 Main burner 8 708 120 296 LP 8 Burner assem bly washe[...]

  • Page 18

    18 6 720 606 804 (02.10)[...]

  • Page 19

    19 6 720 606 804 (02.10)[...]

  • Page 20

    Replacement Parts available from North American Distributor CONTROLLED ENERGY CORP . 340 Mad River Park W ait sfield, V ermont 05673 Phone 800-642-31 11 Fax (802) 496-6924 ww w .controlledenergy .com techsupport@controlledenergy .com VULCANO T ermodomésticos S.A. Estrada de Cacia 3801 - 856 Aveiro - PORTUGAL Recycled paper 1 1 e g a p e e s E L B [...]