Instruction/ maintenance manual of the product GWH 425 EF Bosch Appliances
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2 6 720 607 017 WARNING : Improper installation, adjustment , alterat ion, service or maint enance can c ause injury or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or t he gas supplier.
3 6 720 607 017 425 EF LP and 425 EF NG Specifications W ater Connection 1 /2” T hread fitting N PT H x W x D 29 3/ 4” x 1 8 1 /4” x 8 3/4" V ent 4” Gas C onnection 1 /2” N PT thread Min. W ater Pressure 1 8 Psi Max. W ater Pressure 1 50 Psi Shipping W eight 50.
4 6 720 607 017 M I N I M U M I NST ALLA TI ON C LE ARAN C E S F R OM C O M B U S TI B LE AN D N ON C OM B USTI B LE MA TE R IAL S F OR AL C O VE O R C L O S ET I N S T ALLA TI O NS FR ONT VI EW S ID E VI E W MOD EL 425 E F * On a combustible wall surface the unit should be mounted away from the wall to provide adequate clearance of the vent pipe.
5 6 720 607 017 GE NE RA L RU L ES T O FOL L OW FOR SAFE OP ER A TIO N 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 SI Z223.
6 6 720 607 017 COMBUSTION AIR REQUIREMENTS T he 425 E F water heater holds cold water in its copper heat exchanger and brass water valve when not in use. Because of this, any cold air that comes in through the unit’s vent pipe is capable of freezing these components.
7 6 720 607 017 Fig . 3 - Inc andescent Part icle T ray Illust rat ion The incandescent particle tray (shipped loose in the carton with the water heater) must be attached at the bottom of the water heater front cover at the time of installation. Use the screws provided.
8 6 720 607 017 VENTING WARNING: Do not reduce the vent pipe size and do not common vent with any other vented appliance or stove. This appliance must be vented horizontally to the outside with a sealed 4” single wall vent pipe.
9 6 720 607 017 Fig 4 : Some V enting Guide Suggest ions An approved side wall vent terminal must be used when the water heater is vented through a side wall .
10 6 720 607 017 Fig 5: Side wall exit locations for mechanical draft vent terminals SOFFIT VENT HOOD 7’ MINIMUM ABOVE PUBLIC WALKWA Y ONE FOOT ABOVE GRADE 3’ ABOVE ANY FORCED AIR INLET WITHIN 10.
11 6 720 607 017 Fig. 6 - Appliance pressure regulator (with directional arrow on reverse side pointing up) GAS LINE SIZING The pressure regulator provided with the heater is adjusted to deliver the proper gas pressure (as indicated on the rating plate and in the manual for altitude up to 2000 feet (660 meters) above sea level.
12 6 720 607 017 GAS PIPING, CONNECTIONS Before connecting the gas supply , c hec k the rating plate on the right side of the front cover to be sure that the heater is rated for the same gas to which it will be connected.
13 6 720 607 017 Fig.7 - Water valve and water connectors, top view W A TER C ONNE C TI ONS Install the heater centrally in the building if possible and make hot water piping runs as short as possible When facing the heater , the cold water inlet will be on the right and the hot water outlet on the left.
14 6 720 607 017 ELECTRICAL CONNECTIONS WARNING: For safety reasons, disconnect the power supply to the heater before any service or testing is performed. WARNING: This heater must be electrically grounded in accordance with the most recent edition of the National Electrical Code , NF P A 7 0.
15 6 720 607 017 O PERA TIN G INST RU CT IONS Before operating the heater , make sure that the system is filled with water. Open the cold water inlet supply to the heater fully .
16 6 720 607 017 Fig. 1 2 - Characterist ic Pilot Flame Flame sensor Piezo Electrode W at e r V alve (Part # 8 7070 0 28 02): The water valve on this heater should be ser viced periodically .
17 6 720 607 017 3. Wat er flow is not sufficient to act ivat e heat er . W ater flow rate at faucet is below minimum flow needed to activate heater . W hen temperature adjustment knob is turned all the way clockwise, the model 425 E F requires 1 /2 gallon per minute flow to activate the heater .
18 6 720 607 017 Mineral deposits can eventually (3-5 years in hard water areas) corrode the water valve parts to a point where they will need replacing. Any sign of moisture at the bleed hole is a sign that the water valve needs to be replaced immediat ely .
19 6 720 607 017 WA TE R I S T O O H O T 1 . T emperat ure Selection t oo high T urn the temperature adjustment knob counter-clockwise (to the left) to lower the maximum water temperature.
20 6 720 607 017 Fig. 1 5 - Diagram of 425 E F 1 . Heat exchanger 2. Pilot assembly 3. Burner manifold gas pressure test nipple 4. Main gas burner 5. Pilot gas tubing 6. Gas valve 7 . electric control box 8. Power cord 9. on/off switch 1 0. T emperature adjustment selector 1 1 .
21 6 720 607 017 Fig . 1 6 - I NTE R IOR COM PON E NTS DIAGR AM AN D P ARTS LI ST.
22 6 720 607 017 Fig . 1 6 INTERIOR COMPONENTS DIAGRAM AN D P ARTS LI ST 425 EF 1 Cover 8 705 421 775 2T e m p era tur e ad j ustment kno b 8 702 000 111 3 Te m p era tur e ad j ustment co l lar 8 700.
23 6 720 607 017 Fig . 1 7 - Flow chart of 425 E F.
24 6 720 607 017 Fift een Y ear Limit ed W arrant y General B OSC H P RO water heaters are warranted by the Manufacturer ( BO SC H ) through Controlled Energy C orp.
25 6 720 607 017.
VU L C ANO T ermodomésticos S.A . Estrada de Cacia 38 0 1 - 856 Aveiro - PO RTUGAL Recycled paper © 2003 C ontrolled Energy Corporation, W aitsfield , VT all rights reserved Replacement Parts available from North American Distributor CO NTRO LLED E NE R G Y CO RP .
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