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Bosch GWH 425 PN

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About

Bosch GWH 425 PNBosch GWH-425-HN-N Tankless Water Heater, Indoor Use
Bosch GWH-425-HN-N Tankless Water Heater, Indoor Use Ideal for households looking to maximize energy savings. New homeowners want the energy-efficient, endless supply of hot water only a gas tankless water heater can deliver. Elegantly engineered, these units are small, lightweight, and easy to install and maintain. Patented Bosch Hydro-Generated Ignition Technology. The Bosch engineers have proven that water can indeed make fire. The pilot is ignited by a super-concentrated spark generated by a... Read more

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Brand: Bosch
Part Numbers: GWH 425 HN N, GWH-425-HN-N, GWH425HNN

 

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Comments to date: 6. Page 1 of 1. Average Rating:
dod11 6:41pm on Sunday, October 17th, 2010 
I really like the fact that the Cowon O2 automatically "downscales" large video files (I usually encode DivX at 640x480) to play on this PVP.
Betsy 9:38am on Wednesday, June 30th, 2010 
Excellent PMP for Movies I researched PMPs in the price range up to $250 hoping to stay less than $150 but the more I looked and compared the more I r...
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Cowon iAudio O2 does pleased my eyes. After my Ipod touch, I decided to go for Cowon O2.
ilan 9:56pm on Monday, June 7th, 2010 
This is a very very good player. The SQ on t...  Really good video quality. The best sounding music player on the market. Well built.
t.goessi 6:00am on Monday, May 10th, 2010 
This player is perfect for video enthusiasts. I do not need internet, or online stores, just video playback and it does this well.
mpaulman 7:03pm on Thursday, April 1st, 2010 
I really like the fact that the Cowon O2 auto...  Plays the widest variety of audio and video files I have seen in a PVP, great equalizer. I really like the fact that the Cowon O2 automatically "downscales" large video files (I usually encode DivX at 640x480) to play on this PVP.

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Documents

doc0

IAPMO Research and Testing, Inc. is a product certification body which tests and inspects samples taken from the supplier's stock or from the market or a combination of both to verify compliance to the requirements of applicable codes and standards. This activity is coupled with periodic surveillance of the supplier's factory and warehouses as well as the assessment of the supplier's Quality Assurance System. This listing is subject to the conditions set forth in the characteristics below and is not to be construed as any recommendation, assurance or guarantee by IAPMO Research and Testing, Inc. of the product acceptance by Authorities Having Jurisdiction.
Effective Date: Product: Issued To:

January 2010

-Rev. 7/23/2010-
Void After: January 2011 File No. 6710
California Lead Plumbing Law Devices and Components Bosch Termotecnologia S.a. En16-km3,7 Aveiro, 3800-533 CACIA Portugal

IDENTIFICATION:

Each fitting shall bear permanent and legible markings to identify the manufacturer. This marking shall be the trade name, trademark, or other mark known to identify the manufacturer. The product may also bear the term "California Lead Plumbing Law" or "Complies with California Lead Plumbing Law" above or in close proximity to the appropriate IAPMO R&T certification mark and if the products meet requirements of the Uniform Plumbing Code.

CHARACTERISTICS:

Plumbing products to be installed in accordance with the manufacturer's instruction. Manufactured in compliance with Section 116875 of the California Health & Safety Code and the Vermont's Lead Reduction Law. Products listed on this certificate have been tested by an IAPMO R&T recognized laboratory. 17025. This recognition has been granted based upon the laboratorys compliance to the applicable requirements of ISO/IEC
For the most accurate and updated information please visit http://pld.iapmo.org/6710

DOC#081A

Page 2 -Rev. 7/23/2010Product: Issued To: MODELS: Model No. GWH 715 CTD R EFS LPG GWH 715 CTD R EFS NG GWH C 800 CTD R EFS LPG GWH C 800 CTD R EFS NG GWH 2400 CTD R EFS LPG GWH 2400 CTD R EFS NG GWH 2700 CTD R EFS LPG GWH 2700 CTD R EFS NG Integra 500 NG Integra 500 LPG Evolution 500 LPG Evolution 500 NG GWH 1000 P LP GWH 1000 P NG GWH 1600 P LP GWH 1600 P NG GWH 1600 H LP GWH 1600 H NG GWH 1600 PS LP GWH 1600 PS NG GWH 260 PN N GWH 260 PN L GWH 425 HN L GWH 425 HN N GWH 425 PN L GWH 425 PN N GWH 425 PS L GWH 425 PS N GWH C 920 CTD R EFS LP GWH C 920 CTD R EFS NG GWH C 920 CTD RC EFS LP GWH C 920 CTD RC EFS NG C 1210 ESC NG C 1210 ESC LP C 1210 ES NG C 1210 ES LP C 1050 ES NG C 1050 ES LP 940 ES NG 940 ES LP 940 ESO NG 940 ESO LP 520 HN NG 520 HN LP 520 PN NG Description Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall Gas fired wall hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang hang instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous instantaneous water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water water heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater heater California Lead Plumbing Law Devices and Components Bosch Termotecnologia S.a. Void After: January 2011 File No. 6710

Page 3 -Rev. 7/23/2010Product: Issued To: 830 PN PN PN ES ES LP NG LP NG LP California Lead Plumbing Law Devices and Components Bosch Termotecnologia S.a. Gas Gas Gas Gas Gas fired fired fired fired fired wall wall wall wall wall hang hang hang hang hang instantaneous instantaneous instantaneous instantaneous instantaneous water water water water water heater heater heater heater heater Void After: January 2011 File No. 6710
Page 4 -Rev. 7/23/2010Product: Issued To: California Lead Plumbing Law Devices and Components Bosch Termotecnologia S.a. Void After: January 2011 File No. 6710

ADDITIONAL COMPANY INFO:

doc1

Installation manual

AQ4 Horizontal Vent Kit

For Bosch AquaStar Models: GWH 1600 P, GWH 1600 H For Bosch ProTankless Models: GWH 425 PN, GWH 425 HN* For Bosch THERM Models: 520 PN, 520 HN
WARNING: 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 additional information consult a qualified installer, service agency or the gas supplier. 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.
* The GWH 425 HN has been redesigned. This vent kit is not compatible with the older version (identified by a white cover). Use the AQ1 horizontal vent kit with the older version.

Table of Contents

1 Introduction
1.1 1.2 1.3 1.4 Parts included Warnings Preparation Requirements for installation in Massachusetts

... 3... 3... 3... 4

2 AQ4 Installation instructions
2.1 Introduction 2.2 Locating power vent hood and clearances 2.3 Power vent hood 2.4 Power vent motor 2.5 Vent piping 2.6 Linear safety spillage switch 2.7 Flow switch
... 5... 5... 5... 6... 7... 7... 8

3 Operation

3.1 First time start up
4 Maintenance 5 Troubleshooting
5.1 Introduction 5.2 Power vent motor runs all the time or intermittently without water flow 5.3 Pilot will not hold when lit or spark automatically with hot water flow 5.4 Sparks but pilot will not light 5.5 Pilot goes out during hot water use 5.6 Noise when power vent motor is running

... 10... 10

... 10... 10... 11... 11... 11
6 One Year Limited Warranty 7 Wiring diagram 8 Vent hood template

... 12... 13... 14

AQ4 Manual

Introduction

1.1 Parts included
Vent Hood Kit 1 - 4 vent hood: VH1-- Exterior screws 1 - 5 to 4 vent reducer pipe Vibration Mount Packet 2 - Vibration mounts with nuts and washers 2 - Brackets with nuts and washers Flow Switch Packet 1 - Flow switch 4 - Replacement pipes (See chapter 2.7) 2 - Pipe clips 1 - Molex connector cable 1 - Heat exchanger bushing Power vent motor 1 - Power vent motor (HSUL Series containing -1 integrated 24v control circuit) including 25 foot control cable with wire nuts and an HPN 6-foot power cord 5 - Nylon ties Warning: If the back draft flapper on the vent hood does not close properly, it may allow freezing air to come in contact with the water heaters heat exchanger and cause the heat exchanger to burst. Such damage is not covered under the water heaters warranty.

1.3 Preparation

1. Follow installation and operating instructions manual supplied with the water heater. 2. Before mounting water heater to wall, check its minimum clearance requirements. 3. When using an AQ4 the maximum vent length from the water heater to the point of termination is 25 feet with one elbow. Subtract 5 feet for each additional 90 elbow (up to two additional elbows allowed.) 4. Install power vent motor as close to the vent hood as possible.

1.2 Warnings

1. Failure to install, maintain and/or operate the power vent in accordance with manufacturers instructions may result in conditions which can produce bodily injury and property damage. 2. The power vent must be installed by a qualified installer in accordance with all local codes or, in their absence, in accordance with the National Fuel Gas Code (ANSI Z223.1 NFPA #54), the National Electric Code, the Canadian Electrical Code (C22.1), Canadian Gas Code (CSA B149.1) and The Occupational Health and Safety Act (OSHA) as applicable. 3. The power vent motor shaft must be mounted horizontally to prevent motor bearing wear. 4. Disconnect power supply when making wiring connections or when working around the fan blade and motor. Failure to do so may result in severe personal injury and equipment damage. 5. Make certain the power source is adequate for the fan motor requirements. Do not add the power vent to a circuit where the total load is unknown. AQ4 Motor is 200 watts- 1.66 amps @ 120vac. 6. Locate the outlet receptacle as close to the vent motor as possible. Do not use an extension cord.

1.4 Requirements for installation in Massachusetts
Attention residents of the Commonwealth of Massachusetts: In the Commonwealth of Massachusetts the following regulation went into effect on 12/30/2005: (a) For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied: 1. I N S TA L LAT I O N O F C A R B O N M O N OX I D E DETECTORS. At the time of installation of the side wall horizontally vented gas-fueled equipment, the installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector with an alarm and battery back-up is installed on the floor level where the gas equipment is to be installed. In addition, the installing plumber or gasfitter shall observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building or structure served by the side wall horizontally vented gas-fueled equipment. It shall be the responsibility of the property owner to secure the services of qualified licensed professionals for the installation of hard wired carbon monoxide detectors. a. In the event that the side wall horizontally vented gas-fueled equipment is installed in a crawl space or an attic, the hard wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent floor level. b. In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner shall have a period of thirty (30) days to comply with the above requirements; provided, however, that during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm shall be installed. 2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified. 3. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall 4

read, in print size no less than one-half (1/2) inch in size, GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS. 4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5.08(2)(a)1 through 4. (b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4: 1. The equipment listed in Chapter 10 entitled Equipment Not Required To Be Vented in the most current edition of NFPA 54 as adopted by the Board; and 2. Product approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from the dwelling, building or structure used in whole or in part for residential purposes. (c) MANUFACTURERS REQUIREMENTS GAS EQUIPMENT VENTING SYSTEM REQUIRED. When the manufacturer of Product Approved side wall horizontally mounted gas equipment provides a venting system design or venting system components with the equipment, the instructions provided by the manufacturer for the installation of the equipment and the venting shall include: 1. Detailed instructions for the installation of the venting system or the venting system components: and 2. A complete parts list for the venting system design or venting system. (d)MANUFACTURER REQUIREMENTS GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED. When the manufacturer of a product approved side wall horizontally vented gas fueled equipment does not provide the parts for the venting of flue gases, but identifies special venting systems, the following requirements shall be satisfied by the manufacturer: 1. The referenced special venting system instructions shall be included with the appliance or equipment installation instructions; and 2. The special venting systems shall be product approved by the Board, and the instructions for that system shall include a parts list and detailed installation instructions. (e) A copy of all installation instructions for all products approved side wall horizontally vented gas fueled equipment, all venting instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the appliance or equipment at the completion of the installation.

AQ4 Installation instructions

2.1 Introduction

Please follow these instructions. Failure to follow instructions may result in: Damage, injury or death Improper operation Loss of warranty If you are unable to perform the tasks required to install the water heater and this accessory properly, please contact a locally licensed plumber, HVAC contractor or gas technician. Please contact Bosch Water Heating with any questions.
The exit terminals of mechanical vent system shall be located not less than 7 feet above grade when located adjacent to a public walkway. The venting system shall terminate at least 3 feet above any forced air inlet within 10 feet. The venting system shall terminate at least 4 feet below, 4 feet horizontally from or 1 foot above any door, window or gravity air inlet into any building.

2.3 Power vent hood

1. Attach the mounting template (on page 14) to the interior wall that the vent hood will be penetrating. 2. Ensure that the proposed vent termination clearances are met (Chapter 2.2) before cutting opening through wall. Using a 1/2 drill bit, drill two pilot holes where noted on the template. The drill bit must be long enough to penetrate to the building exterior. 3. Attach the template to the outside of the building aligning the pilot holes on the template with the pilot holes drilled in step 2. 4. Using a reciprocating saw, cut a hole through the building siding, wall board, etc., following the appropriate lines of the template. 5. Apply a bead of exterior-rated caulk to the vent hood flange to seal at the exterior of building. 6. Slide the vent hood through the opening and fasten to exterior wall using screws provided. 7. Inspect back draft flapper on hood. If the flapper does not properly close, there is a risk of freezing air coming into the water heater causing the pipes inside to freeze and burst. This condition is not covered by the water heater warranty. See Fig. 11A for a properly closed back draft flapper.
2.2 Locating power vent hood and clearances
The maximum vent length from the water heater to the point of termination is 25 feet with one elbow. If using more than one 90 elbow, subtract 5 feet off the maximum vent length for each additional elbow used. Maximum of three elbows allowed. The power vent motor must be installed as close as possible to the VH1-4 vent hood. Clearances The vent system must terminate so that proper clearances from the center of the vent hood (Fig. 1) are maintained as cited in the National Fuel Gas Code, ANSI Z223.1 and CSA B149.1 in Canada:
The vent terminal shall also not be installed closer than 3 feet from the inside corner of an L -shaped structure, or less than 1 foot above grade or anticipated snow pack level.
Fig. 1 External vent hood clearances AQ4 Manual 5

2.4 Power vent motor

Caution: Power vent motor must be mounted with vibration mounts and with motor shaft horizontal to prevent motor bearing wear. 1. Remove vibration mounts, nuts and washers from parts bag. Install on power vent motor as shown in Fig. 2. 2. To prevent vibration, securely support power vent motor from ceiling or joist using a plumbers strap fastened to the vibration mounts. As an alternative means of support, a wall bracket may be used to support the underside of the motor. Observe a 6" clearance to combustibles on all sides of the power vent motor. (Fig. 3) 3. Connect the power vent motor outlet to the inner sleeve of the vent hood (Fig. 4). Use the four prepunched holes in the outlet collar of the power vent motor as a guide to drill " diameter holes into the vent pipe. Fasten power vent motor outlet to the vent hood inlet using sheet metal screws. Seal the connection with high temperature silicone sealant. Note: Any additional vent pipe used between the power vent motor and the vent hood will be under positive pressure during operation. This vent pipe must be single wall galvanized or stainless steel vent pipe. The connections must be sealed with high temperature silicone sealant when using galvanized or ungasketed stainless steel pipe. 4. Route the control cable from the power vent motor along the ceiling or joists down to the right side of water heater, taking care not to come within 6" of the vent pipe or any other potentially hot surface. In many cases, the gas or water supply piping can be used as a routing path from the ceiling down to the right side of the water heater. Use the supplied nylon ties to secure the cable.

Fig. 2 Vibration mounts and recommended support

6"

Fig. 3 Minimum clearances to power vent motor
Fig. 4 Vent connection to power vent motor

2.5 Vent piping

1. Install 5" to 4" reducer pipe on top of the water heater and then connect a 4" 90 elbow to begin the horizontal run. Use 4 vent pipe to connect from this elbow to the power vent motor inlet, avoiding elbows when possible. The maximum vent length from the water heater to the point of termination is 25 feet with one elbow. (Fig. 5) If using more than one 90 elbow, subtract 5 feet off the maximum vent length for each additional elbow used. A maximum of three elbows is allowed. The minimum straight vent length is 2 ft. 2. Support the vent pipe in accordance with vent pipe manufacturers instructions. Vent pipe is not supplied in the power vent kit, with the exception of the 5" to 4" reducer in the AQ4 kit. Observe the clearances associated with the class of vent pipe used. 4" single wall galvanized, 4" stainless steel or 4" B-vent pipe is required.

Fig. 5 Venting setup

2.6 Linear safety spillage switch
The linear safety spillage switch provides a means for safety shut down of the water heater in the event of flue blockage or power vent failure. If hot flue gases spill from the draft hood diverter, the draft spillage sensing switch will open the pilot safety circuit and shut off all gas to the water heater. The switch is normally closed and opens at temperatures greater than 185 F. It has a manual reset button. Mounting the linear safety spillage switch 1. Attach the spillage switch to the top left of the heaters draft diverter using the existing hole and the included mounting screw. (Fig. 6) 2. Lay copper capillary sensing tube across top of the draft diverter. Allow excess tube to hang down right side of heater. Do not cut or crimp capillary tube. 3. Route the two wires from the spillage switch down the left side of heater to the ECO keeping the cables out of contact with hot surfaces. (Fig. 6) Connecting linear safety spillage switch to pilot safety circuit The ECO/temperature limiter is mounted on the lower left outlet water pipe. (Fig. 7) 1. Remove one wire lead connected to ECO terminal (it does not matter which one is disconnected). 2. Attach " quick connect terminal end of linear spill switch cable to now exposed terminal of the ECO. 3. Connect the male spade connector to the removed lead wire from step 1. See the wiring diagram in Fig. 13 to confirm proper set up.

Fig. 6 Linear safety spillage switch mounting

ECO terminals

Fig. 7 ECO location

2.7 Flow switch

Replacement piping and flow switch is included for 1600P/425PN and 1600H/425HN water heaters. Check your model number on the right side of the water heater cover to confirm which procedure to follow. 2.7.1 Models 1600P/425PN 1. Shut off cold water supply isolation valve. If none installed, install before proceeding. Open hot water tap to relieve water pressure if water is already connected. 2. Remove and save clip on lower right side of heat exchanger. 3. Using a flat head screw driver remove and save pin from front, right side of water valve. (Fig. 8) 4. Remove copper pipe and set aside. 5. Find and connect the black flow switch to the bushing and pipes shown in Fig. 9A. Secure together with supplied clips. 6. Position flow switch and connecting pipe and bushing in place of the copper pipe that was removed. 7. Reinstall pin in water valve and clip on heat exchanger connection. 8. Connnect the three prong Molex connector cable to the flow switch. 9. Connect control cable from vent motor to Molex connector cable with wire nuts as seen in Fig. 10. 2.7.2 Models 1600H/425HN 1. Shut off cold water supply isolation valve. If none installed, install before proceeding. Open hot water tap to relieve water pressure if water is already connected. 2. Remove and save clip on lower right side of hydrogenerator. 3. Remove and save pin from front, right side of water valve using a flat head screwdriver. (Fig. 8) 4. Remove copper pipe and set aside. 5. Find and connect the black flow switch to the pipes shown in Fig. 9B. Note: There are two pipes included for connection from flow switch to hydro-generator. One is slightly longer than the other. If your water heaters serial number is greater than FD792, you must use the longer pipe for this connection. 6. Position flow switch and connecting pipes in place of the copper pipe that was removed. Secure together with supplied clips. 7. Reinstall pin in water valve and clip on heat exchanger. 8. Connnect the three prong Molex connector cable to the flow switch. 9. Connect control cable to Molex connector cable with wire nuts as seen in Fig. 10. 8
Water valve pin Pipe to heat exchanger

Fig. 8 Water valve pin

Connection to water valve
Brass heat exchanger bushing
Flow switch molex connector Replacement pipe for pilot models
Fig. 9A 1600P/425PN flow switch connections
Connection to hydro generator
Replacement pipes for hydro models
Flow switch molex connector

Fig. 9B 1600H/425HN flow switch connections
Connections from Molex connector cable (white and yellow)
Connection from vent motor (black and red)
Fig. 10 Flow switch electrical connections AQ4 Manual

Operation

3.1.1 Time delay relay 1. The AQ4 power vent kit is equipped with a time delay relay. It is supplied with the time delay set at the (0.1) second position 2. If installing the AQ4 with standing pilot models 1600P or 425PN, no adjustment is required. 3. If installing the AQ4 with hydro ignition models 1600H or 425HN, move the adjuster on the time delay to the (2) second position. (Fig. 11B) 4. To access the time delay relay, unplug powervent and remove the electrical box cover on power vent motor. (Fig. 11A)
3. With the gas supply to the water heater turned off (see water heater manual) turn on a hot water tap. The power vent motor should come on. Verify blown out of the power vent hood. If not, see the troubleshooting tips in Chapter 5. 4. Turn off hot water tap. 5. Open gas supply to the water heater and follow the lighting instructions in water heater installation manual. 3.1.3 Draft test 1. Operate the water heater by running hot water. Check for proper combustion and ensure there is no spillage by holding an recently extinguished match or other visible smoke source in front of the draft divertor. The smoke from the extinguished match should be quickly sucked into the opening and up the exhaust venting. If the smoke is blown back, there is a blockage in the vent or the vent motor is not operating properly. 3.1.4 Safety interlock test 1. Open the gas supply to the water heater. 2. the outside. CAUTION: The metal of the back draft test.

cover screw

Fig. 11A Accessing the time delay relay
3. Turn on the hot water supply to allow the burner draft diverter momentarily. In less than three (3) minutes, the linear spillage switch should trip, opening the the heater safety circuit and halting NOTE: If spillage switch does not shut off the gas, check that you have made the proper safety circuit connections. If the switch still does not trip, contact Bosch Water Heating. 4. After the burners shut off, turn off hot water supply and wait 2-3 minutes.then push the reset button on the linear spillage switch. 5. Depending on model, light the pilot or run hot water and repeat Safety Interlock Test, (Step 1-4) 6. properly once test is complete. A properly closed

Fig. 11B Time delay relay positioning 3.1.2 Verifying proper operation of powervent It is important to verify proper operation of the power vent motor before commissioning the system: 1. Slowly turn on cold water supply and check for any 2. Plug power vent motor into 120VAC outlet.

Maintenance

4 Maintenance
The vent system must be inspected at regular 3-month intervals. Points of inspection are as follows: 1. Screened opening of the vent hood should be free from foreign material and cleaned as necessary. 2. Check all vent system connections for leakage and reseal where needed with high temperature silicone sealant. If any vent pipe component shows signs of deterioration, replace immediately. 3. Inspect for proper closure of the back draft flapper. If the flapper does not properly close, there is a risk of freezing air coming across the heat exchanger which may cause the pipes inside to freeze and burst. This condition is not covered by the water heater warranty. See Fig. 11A for a properly closed back draft flapper. 4. Conduct safety interlock test and operation of back draft flapper once a year (Chapter 3.1.3).

5 Troubleshooting

5.1 Introduction
Many of the questions customers ask regarding operation of this unit can be answered by following the troubleshooting steps outlined below. Visit our website at www.boschhotwater.com for more detailed troubleshooting. For best results, perform each step before proceeding to the next.
5.2 Power vent motor runs all the time or intermittently without water flow
1. The power vent motor is flow switch activated. If the internal paddle inside the flow switch is jammed, it may constantly send a signal to turn on the fan. Shut off water supply to heater and drain. Remove flow switch from water heater piping by removing clips on both ends. Flush water through both ends of flow switch to free up internal paddle and clear debris. After flushing, shake flow switch up and down. The internal paddle should be heard moving freely back and forth. 2. Large amounts of water demand can create pressure drops throughout the plumbing. This may allow for movement of the power vent flow switch and activate the fan. Activated sprinkler systems or flushed toilets are common causes for this symptom. Consult a plumbing professional to correct unintentional water flow through the heater. 3. In buildings with excessively high water pressure, a condition known as water hammer may exist. This condition is caused by a combination of high water pressure and the abrupt closing of a faucet valve or internal washer/toilet valve. This instant change in flow results in an instant change in the internal pressures in the pipe, which then sends a shock wave through the pipe. This physical shock will shake, rattle or cause a loud bang in the plumbing which is referred to as water hammer. Such a shock wave may cause movement of the power vent flow switch which will activate the fan. Consult a plumbing professional for the use of a pressure reducing valve, expansion tank or water hammer arrestor to combat this condition.

Fig. 11A Properly closed back draft flapper
Fig. 11B Improperly closed back draft flapper

Troubleshooting

5.3 Pilot will not stay lit when manually lit (1600P and 425PN) or will not spark automatically with hot water flow (1600H and 425HN)
1. Check the linear safety spillage switch reset button to see if it is tripped (See Section 2.6). Overheating or loss of power to the unit will trip the safety spillage switch and stop the flow of gas. 2. Check the entire pilot safety circuit (including the safety spillage switch) for loose or dirty connections (See Fig 8). Clean any corrosion evident with a pencil eraser or light sandpaper. 3. Pilot flame is weak or yellow. Consult water heater installation manual for instructions on cleaning the pilot assembly.
5.6 Noise when power vent motor is running
1. Ensure power vent motor is mounted level with motor shaft horizontal to prevent premature motor bearing wear. 2. Ensure power vent motor is mounted using the supplied vibration mounts to prevent premature motor bearing wear. 3. Remove vent pipe connection from water heater to power vent motor. Inspect internal fan wheel for broken fins. If any damage is evident, order online or call Technical Support (800) 642-3111 for a replacement wheel kit.
5.4 Spark but pilot will not light (1600H and 425HN only)
1. Check time delay relay for proper setting. See Section 3.1.1. Set time delay relay adjuster to the (2) second position for 1600H and 425HN only. If the pilot will not consistently light, move adjuster to the (3) second position and to (4) second position if needed. DO NOT exceed position (4). Complete saftey interlock test after changing setting. See Section 3.1.3.
5.5 Pilot and/or burners go out during hot water use
1. Inspect entire vent system for blockage or obstruction. Ensure the back draft flapper installed on the power vent hood swings freely. 2. Verify power vent fan operates with water flow. If not, verify wire connection from flow switch to fan motor. Clean cold water inlet filter and verify flow rate through the water heater is adequate enough to activate the flow switch. If flow rate is more than 0.5 GPM, the flow switch may be defective and should be replaced. 3. If heater is newly installed, verify power vent fan motor is not installed backwards (See Fig 4). 4. Ensure power vent motor is mounted as close as possible to the VH1-4 vent hood. Mounting the power vent motor directly on top of or close to the water heater, may result in lifting flames and pilot outages. Vent pipe length must be at least 2 feet.

One Year Limited Warranty
6 One Year Limited Warranty

General

The vent kit is warranted by the Manufacturer (TJERNLUND) through Bosch Thermotechnology Corp. Bosch Thermotechnology will furnish a replacement part which fails in normal use and service within the applicable periods specified below, in accordance with the terms of this warranty. The Bosch Thermotechnology replacement will be warranted for the unexpired portion of the original warranty. This warranty will be valid only for vent kits in possession of the original purchaser.

How to Make a Claim

Any claim for warranty parts should be made to your local dealer, distributor or to Bosch Thermotechnology. If Bosch Thermotechnology, please contact the Technical Support Department: BOSCH THERMOTECHNOLOGY CORPORATION 50 Wentworth Ave Londonderry, NH 03053 Phone: 800-642-3111 www.bosch-climate.us In most cases, the dealer or distributor will be able to promptly honor your claim and subsequently notify Bosch Thermotechnology. However, all replacements are made subject to validation by Bosch Thermotechnology of in-warranty coverage. The damaged or defective item must be made available in exchange for the replacement.

The Warranty Terms

If any vent kit component fails within one (1) year after the original installation and operation, Bosch Thermotechnology will furnish a replacement component. However, if the vent kit is installed in other than a single family dwelling, the warranty is limited to thirty (30) days from date of original installation and operation.

Exceptions

This warranty will not apply: 1. to defects or malfunctions resulting from failure to properly install, operate or maintain the unit in accordance with the printed instructions provided; 2. to damage or abuse, accident, neglect or other acts of nature; 3. to failure of the vent motor resulting from the operation of the vent kit in a corrosive atmosphere; 4. to defects or damage caused by any attachment or modification, including any energy-saving device. Shipping costs: In addition to supplying the replacement part(s), Bosch Thermotechnology will provide ground service delivery for these parts. Expedited or upgraded shipping will be charged to the customer.

Miscellaneous

No one is authorized to make any other warranties on behalf of Bosch Thermotechnology. It is expressly understood that the replacement warranty of Bosch Thermotechnology shall be in lieu of any and all other warranties, express or implied, including warranties of merchantability or fitness for a particular use or purpose, and further that Bosch Thermotechnology shall not be liable for any loss or damage directly or indirectly arising from the use of the vent kit, or for any consequential damages arising from such use. Bosch Thermotechnology sole liability with respect to any defect shall be for the replacement of the defective part(s). Some states do not allow such limitations and exclusions, so the above may not apply to you. This warranty gives specific legal rights. You may also have other rights which vary from state to state.

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 vent kit or a replaced vent kit.

Wiring Diagram

7 Wiring diagram
115/1/60 PLUG GREEN BLACK TIMER RELAY BLACK

C NC NO

POWER VENT MOTOR GREEN
115VAC TRANSFORMER RED 24VDC

YELLOW WIRE NUT YELLOW

WIRE NUT RED BLUE

TIMER RELAY

FLOW SWITCH (N/O)
DENOTES LINE VOLTAGE FACTORY WIRING DENOTES LOW VOLTAGE FACTORY WIRING
Fig. 12 Fan wiring diagram

425HN and 1600H wiring

425PN and 1600P wiring
Fig. 13 Safety circuit wiring diagram

Vent hood template

mounting
1. Use scissors to detach template. Verify external vent hood installation clearances on page 5 (Fig. 1) are adhered to. Attach the vent hood mounting template to the interior of the wall the vent hood will be penetrating. 2. Verify that wall penetration will not come in contact with concealed wiring or plumbing. Using a 1/2 drill bit, drill two pilot holes where noted on the template. The drill bit must be long enough to penetrate to the building exterior. 3. Attach the template to the building exterior aligning the pilot holes on the template with the pilot holes drilled in step 2. 4. Using a reciprocating saw, cut an opening through the building siding, wall board, etc., following the lines of the template. 5. Slide the vent hood through the opening and fasten to exterior wall using provided screws. 6. Once power venter is completely installed and secured, apply a bead of exterior rated caulk between vent hood flange and exterior of building.

CUT HOLE THROUGH WALL

TEMPLATE

PILOT HOLE

BUILDING EXTERIOR NOTE: HARDWARE SHOWN INCLUDED WITH VENT HOOD
WASHER (4) SHEET METAL SCREW (4)
WHEN INSTALLING THE VENT HOOD FOLLOW THE BACK DRAFT FLAPPER INSTRUCTION SHEET IF OUTDOOR TEMPERATURES MAY DROP BELOW FREEZING
Fig. 14 Vent hood mounting template
Bosch Thermotechnology Corp. 50 Wentworth Avenue Londonderry, NH 03053 Tel: 1-866-642-3198 Fax: 1-603-584-1681 www.bosch-climate.us

 

Technical specifications

Full description

Bosch GWH-425-HN-N Tankless Water Heater, Indoor Use Ideal for households looking to maximize energy savings. New homeowners want the energy-efficient, endless supply of hot water only a gas tankless water heater can deliver. Elegantly engineered, these units are small, lightweight, and easy to install and maintain. Patented Bosch Hydro-Generated Ignition Technology. The Bosch engineers have proven that water can indeed make fire. The pilot is ignited by a super-concentrated spark generated by a micro-turbine. The micro-turbine is activated by a request for hot water in the house. This energy efficient technology makes the 425 HN ideal for households looking to maximize energy savings. - 80% a

 

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