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Bosch Appliances GWH-425-HN-N - page 1
Water heat ers for u se with Natural an d L.P.G. GWH 425 HN Flow Mo dulat ed wit h Elec t ronic Ignit ion Suit able for heat ing pot able wat er o nly - Not approve d for spac e heat ing pu rposes (Intend ed for vari able fl ow applicatio ns with stea dy cold wa ter inlet t emperatu res) GWH- 425-HN -N GWH- 425-HN -L 6 720 607 026 US (04. 11) AL Wa ...
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Bosch Appliances GWH-425-HN-N - page 2
2 6 720 607 026 WARNING : Improper installation, adjustment , alterat ion, service or maint enance c an c ause 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 us ...
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Bosch Appliances GWH-425-HN-N - page 3
3 6 720 607 026 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 flame sensor ...
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Bosch Appliances GWH-425-HN-N - page 4
4 6 720 607 026 M I N I M U M I N S T ALLA TI O N C LE ARAN C E S F R O M C O M B U STI B LE AN D N O N CO M B U S TI B LE MA TE R IALS F O R AL C OVE O R C L O S ET I N ST ALLA TI O N S FRONT VIEW SIDE VIEW MO DE L 425H N MODEL 425 HN TOP (A) 12" FRONT (B) 4" BACK 0" SIDES 4" FLOOR (C) 12" VENT DIAMETER 5" ...
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Bosch Appliances GWH-425-HN-N - page 5
5 6 720 607 026 G E N E R AL R U LE S T O FOLL OW FOR SAF E OP E R A TION 1. Y ou 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 AN S I Z223. 1 / N F P A 54. In Canada: The Installation should conform ...
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Bosch Appliances GWH-425-HN-N - page 6
6 6 720 607 026 WARNING: Flammable materials, gasoline, pressurized containers, or any other items or articles that are potent ially fire hazards must NO T be placed on or adjacent to t he heat er . The appliance area must be kept free of all combustible materials, gasoline and other flammable vapors and liquids. COMBUSTION AIR REQUIREMENTS T he 42 ...
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Bosch Appliances GWH-425-HN-N - page 7
7 6 720 607 026 VENTING V ent pipe connect ion . 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 c himney. T he heater must be located as close as practicable to a vertically rising ...
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Bosch Appliances GWH-425-HN-N - page 8
8 6 720 607 026 T o check t he draft : Close all doors and windows to the outside. T urn 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 425 HN and these other appliances. With the control knob set fully clockwise and str ...
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Bosch Appliances GWH-425-HN-N - page 9
9 6 720 607 026 GAS CONNECTIONS NO TE: The 425 HN is supplied wit h 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 cert ificat ion of t he unit . The regulator supplied with the heater is preset for t ...
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Bosch Appliances GWH-425-HN-N - page 10
10 6 720 607 026 Nominal Iron P ipe Black Iron Pipe Size , Lengt h of Pipe, Feet Inches 10 20 30 40 50 60 70 80 90 100 125 150 1/2 275 189 152 129 114 103 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 4 09 378 346 322 307 275 252 1 1/4 220 149 121 103 913 834 771 724 677 630 567 511 1 1/2 330 229 185 1 ...
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Bosch Appliances GWH-425-HN-N - page 11
11 6 720 607 026 OPER A T ING INST RUC T IONS 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 fauc ...
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Bosch Appliances GWH-425-HN-N - page 12
12 6 720 607 026 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 knob would p ...
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Bosch Appliances GWH-425-HN-N - page 13
13 6 720 607 026 Fig. 1 0 - Charact eristic Pilot Flame (Pilot assembly shown without pilot hood) MAINTENANCE AND SERVICE RE VIEW MAINTENA NCE T ABLE ON THE BA CK OF TH IS MANUAL. Approximately once a year , the 425 H N should be chec ked and cleaned. T o remove the front cover , first remove the incandescent particle tray , then pull off the tempe ...
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Bosch Appliances GWH-425-HN-N - page 14
14 6 720 607 026 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 off. T o do this, remove incandescent particle tray , pull off the temperature adjustment knob and unscrew and remove the plastic collar . Pull main cover out towar ...
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Bosch Appliances GWH-425-HN-N - page 15
15 6 720 607 026 Fig. 1 3 - Electric al wiring diagram 5 . Flue gas safety device tripped V entilate the room and operate the appliance 1 0 minutes later . Provide more combustion air to the room and/or inspect and correct venting system. Afterwards, if it happens again, contact your service person. WA TE R I S TOO HOT 1 . T emperat ure Selection t ...
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Bosch Appliances GWH-425-HN-N - page 16
16 6 720 607 026 HO T WA TE R TE M PE R A TU R E FLUCTUA TE S / U N IT DEAC TIV A TED 1 . Unbalanced pressure in waterlines T he added restriction caused by the 425 H N 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 ...
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Bosch Appliances GWH-425-HN-N - page 17
17 6 720 607 026 Fig . 1 4 - Diagram of 425 H N 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. W ater valve 1 0 . T emperature adjustment selector 1 1 . Gas inlet gas pressure test nipple 1 2. Hose 3 1 4 ...
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Bosch Appliances GWH-425-HN-N - page 18
18 6 720 607 026 Fig. 15 - I NTE R IOR C OM P ON E NTS DIAGR AM AN D P ARTS LIST ...
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Bosch Appliances GWH-425-HN-N - page 19
19 6 720 607 026 Fig. 1 5 INTERIOR COMPONENTS DIAGRAM AN D P ARTS LIST 425 HN 1 Cover 8 705 421 752 2 Tem perature adj ustm ent knob 8 702 000 111 3 Tem perature adj ustm ent collar 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 ass embly washer 8 7 ...
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Bosch Appliances GWH-425-HN-N - page 20
20 6 720 607 026 Fig . 1 6 - Flow chart of 425 H N ...
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Bosch Appliances GWH-425-HN-N - page 21
21 6 720 607 026 Service Labor Costs This warranty does not cover any labor costs associated with service, removal or re-installation of part(s). All such costs must be borne by the Purchaser. Additionally , this warranty does not cover any labor costs associated with service, removal or re-installation of the original water heater or a replaced wa ...
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Bosch Appliances GWH-425-HN-N - page 22
22 6 720 607 026 ...
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Bosch Appliances GWH-425-HN-N - page 23
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Bosch Appliances GWH-425-HN-N - page 24
VU L C ANO T ermodomésticos S.A . Estrada de Cacia 380 1 - 8 56 Aveiro - PO RTU GAL Recycled paper © 20 04 C ontrolled Energy C orporation, W aitsfield, V T all rights reserved Replacement Parts available from North American Distributor CONTROLL E D E N ER G Y C OR P . 340 Mad River Park Waitsfield, Vermont 0 5 6 7 3 Phone 8 6 6-330-27 30 Fax (80 ...
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