Instruction/ maintenance manual of the product GWH 425 EF Bosch
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Water heat ers for u se with Natural an d L.P.G. GWH 425 EF Flow Modulat ed wit h Elec t ronic Ignit ion and Power V ent ing Suit able for heat ing pot able w ater only - Not a pproved fo r spac e hea.
2 6 720 607 017 WARNING : Improper installation, adjustment , alteration , service or maintenance can 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 .
3 6 720 607 017 425 EF LP and 425 EF NG Specifications W ater C onnection 1 /2” Thread 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 N S T ALLA TIO N C LE AR AN C E S F R O M C O M B U STI B LE AN D N O N CO M B U STI B LE MA TE R IAL S F O R AL C OVE O R C L O SET I N ST ALLA TI O N S FR O NT VI EW .
5 6 720 607 017 G E N E R AL R U LE S T O FOLL O W FOR SAF E OP E R A TION 1. Y ou should follow these instructions when you inst all your heater . In the United St ates : The installation must conform with local codes or, in the absence of local codes , the National Fuel Gas Code AN S I Z223.
6 6 720 607 017 COMBUSTION AIR REQUIREMENTS The 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 - Incandescent Part icle T ray Illust ration 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: S ome 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 WALKW AY 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, chec 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 T ER C O NNEC T IO NS 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 OPER A T ING INST RUC T IO NS 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 - Charact eristic Pilot Flame Flame sensor Piezo Electrode W at e r V alve (Part # 87 07 002802): The water valve on this heater should be ser viced periodically .
17 6 720 607 017 3. Water flow is not sufficient to activate heater . W ater flow rate at faucet is below minimum flow needed to activate heater . When temperature adjustment knob is turned all the way clockwise, the model 425 EF 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 immediately.
19 6 720 607 017 WA T E R I S T OO HOT 1 . T emperat ure Select ion t oo high T urn the temperature adjustment knob counter-clockwise (to the left) to lower the maximum water temperature. Note: This will increase the activation flow rate. 2. Inlet water temperature is very warm (60°-75°F) Reduce inlet gas supply to lower the heaters degree rise.
20 6 720 607 017.
21 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 .
22 6 720 607 017 Fig. 1 6 - I NTE R IOR COM PO N E NTS D IAGR AM AN D P ARTS LI ST.
23 6 720 607 017 Fig. 1 6 INTERIOR COMPONENTS DIAGRAM AN D P ARTS LIST 425 E F 1 Cover 8 705 421 775 2 Temperature a djustment knob 8 702 000 111 3 Temperature adjustment collar 8 700 403 008 4 Draft .
24 6 720 607 017 Fig. 1 7 - Flow chart of 425 EF.
25 6 720 607 017 Fift een Y ear Limit ed Warranty General B O SC H P R O water heaters are warranted by the Manufacturer ( B O SC H ) through C ontrolled Energy C orp.
VU L C AN O T ermodomésticos S.A . Estrada de Cacia 380 1 - 8 56 Aveiro - P O RTUGAL Recycled paper © 20 04 C ontrolled Energy Corporation , W aitsfield , V T all rights reserved Replacement Parts available from North American Distributor CONTROLL E D E NE R G Y C OR P .
An important point after buying a device Bosch GWH 425 EF (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
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If you already are a holder of Bosch GWH 425 EF, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Bosch GWH 425 EF.
However, one of the most important roles played by the user manual is to help in solving problems with Bosch GWH 425 EF. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Bosch GWH 425 EF along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
