Bosch GWH 260 PN Bedienungsanleitung

GWH 260 PN

INDOOR MODEL

Flow Modulated with Standing pilot

Suitable for heating potable water only - Not approved for space heating purposes

(Intended for variable flow applications with steady cold water inlet temperatures)

GWH-260-PN-N

GWH-260-PN-L

6 720 608 126 US (06.05) AL

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.

What to do if you smell gas

• Close gas valve. Open windows.

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any

phone in your building.

• Immediately call your gas supplier from a neighbor’s

phone. Follow the gas supplier’s instructions.

• If you cannot reach your gas supplier, call the fire

department.

• Installation and service must be performed by a

qualified installer, service agency or the gas supplier.

6 720 608 126

Index

1 Warning 2

2 Appliance details 3

2.1 GWH 260 PN specifications (Technical data) 3

2.2 Unpacking the GWH 260 PN heater 4

2.3 General rules to follow for safe operation 4

2.4 Dimensions and installation clearances 5

3 Installation instructions 6

3.1 Introduction 6

3.2 Proper location for installing your heater 6

3.3 Heater placement and clearances 6

3.4 Mounting Heater 7

3.5 Combustion air requirements 8

3.6 Venting 9

3.7 Gas piping & connections 11

3.8 Measuring gas pressure 13

3.9 Water connections 13

3.10 Recirculation application 14

4 Operation instructions 14

4.1 For your safety read before operating your water heater 14

4.2 Lighting instructions 15

4.3 To turn off appliance 15

4.4 Setting the water temperature 16

4.5 Draining water from heater 16

5 Maintenance and service 17

5.1 Maintenance intervals 17

5.2 Water valve 17

5.3 Pilot 17

5.4 Main burners 18

5.5 Vent assembly 18

5.6 Mineral scale build-up 18

6 Troubleshooting 19

6.1 Introduction 19

6.2 Pilot does not light 19

6.3 Pilot lights, but goes out when button is released 19

6.4 Pilot goes out during or after hot water use 19

6.5 Burners do not light with water flow 20

6.6 Hot water temperature fluctuates at tap 20

6.7 Water is too hot 21

6.8 Water is not hot enough 21

6.9 Burners ignite without hot water flow 21

6.10 Low hot water pressure 21

6.11 Noise when heater is running 21

6.12 Burners do not operate cleanly; yellow flames

when operating 22

7 Protecting the environment 23

8 Interior components and diagram parts list 24

8.1 Interior components 24

8.2 Components diagram 25

8.3 Parts list 26

9 Fifteen Year Limited Warranty 27

1 Warning

Fig. 1

Warning: The heater must be isolated

from the gas supply piping system

during any pressure testing of that

system at test pressures equal to or

more than 0.5 psig.

Caution: Any changes or

modifications not expressly approved

by the party responsible for compliance

could void the user’s authority to

operate the equipment.

6 720 608 126

Appliance details

2 Appliance details

2.1 GWH 260 PN specifications

(Technical data)

Approved in US/Canada

Capacity

GWH 260 PN: 2.6 GPM

Maximum output

GWH 260 PN: 58 400 Btu/hr

Maximum input

GWH 260 PN: 74 900 Btu/hr

Efficiency in %

Recovery efficiency 78%

Min. Output

GWH 260 PN: 23 906 Btu/hr

Gas Requirement

Gas connection (inches) - ½” NPT

Inlet gas pressure under maximum operation*

• Propane: 10.5” - 14” water column

• Natural Gas: 5.7” - 14” water column.

* To measure Gas Pressure, see Measuring Gas

Pressure, chapter 3.8.

Venting

• Natural Draft

• Vent diameter (inches) - 4”

• Minimum height (feet) - 6’ with no elbows

• Vertical termination.

Water

• Hot water connection (inches) - ½” NPT

• Cold water connection (inches) - ½” NPT

• Water valve material: Polymer (PPS) (Polypropylene

Sulfid)

• Minimum water flow: 0.5 gallon/minute (1.9 l/m)

• Minimum recommended water pressure: 13 PSI

(0.9 bar)

• Connections:

– Bottom of heater

Dimensions

• Depth (in): 8.66” (220 mm)

• Width (in): 12.20” (310 mm)

• Height (in): 22.83” (580 mm)

• Weight: 26 pounds (12 kg).

Gas types

Natural Gas.

LP Gas

Safety devices

• Flame failure device (ionization thermocouple)

• Pressure relief valve (supplied with heater)

• Over heat prevention (temperature limiter).

Water resistant

IP X4.

6 720 608 126

Appliance details

2.2 Unpacking the GWH 260 PN heater

This heater is packed securely.

Before installing the unit, be certain you have the

correct heater for your type of Gas - Propane or

Natural Gas. Identification labels are found on the

shipping box, and on the rating plate which is located on

the right side panel of the cover.

Fig. 2 Rating plate

ASerial number

BType of gas

The box includes:

• Pressure relief valve

• Mounting screws

• Product registration card

• Installation manual

• Incandescent particle tray.

Do not lose this manual, there is a charge for a

replacement.

Please complete and return the enclosed product

registration card.

The GWH 260 PN is not approved or designed for:

• Manufactured (mobile) homes, RV's or boats

• Heating or other recirculating/pumping applications*

• Solar/preheat backup or high temperature booster

use

• Installation in a bathroom or other occupied rooms

normally kept closed.

* This includes domestic hot water circulator pump loop

systems that may be installed in home hot water system

prior to installing this unit. An approved recirculation

design can be found in chapter 3.10.

2.3 General rules to follow for safe

operation

1. You 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 ANSI Z223.1/

NFPA 54.

In Canada: The Installation should conform with CGA

B149.(1,2) INSTALLATION CODES and /or local

installation codes.

2. Carefully plan where you install the heater. Proper

clearances must be followed.

3. The appliance must be isolated from the gas supply

piping system by closing its individual manual gas

shutoff valve (not supplied with heater) during any

pressure testing at pressures in excess of ½ Psig (3.5

kPa).

The appliance and its gas connection must be leak

tested before placing the appliance in operation.

4. Keep water heater area clear and free from

combustibles and flammable liquids. Do not locate the

heater over any material which might burn.

5. Correct gas pressure is critical for the optimum

operation of this heater. Gas piping must be sized to

provide the required pressure at the maximum output of

the heater, while all the other gas appliances are in

operation. Check with your local gas supplier, and see

chapter 3.7 and 3.8 to verify proper gas line sizing.

6. Should overheating occur or the gas supply fail to

shut off, turn off the gas supply at the manual gas shut

off valve, on the gas line. Note: manual gas shutoff valve

is not supplied with the heater.

7. Do not use this appliance if any part has been

underwater. Immediately call a qualified service

technician to inspect the appliance and to replace any

part of the control system and any gas control which

has been underwater.

BOSCH is constantly improving its

products, therefore specifications are

subject to change without prior notice.

6 720 608 126

Appliance details

2.4 Dimensions and installation clearances

Fig. 3 Dimensions in Inches and (mm)

4Heat exchanger

5Burner

10 Temperature control

11 Water valve

20 Gas connection

26 Output control

36 Front cover

37 Hole for fixing to wall

38 Exhaust pipe to connector

39 Draft diverter with flue gas monitor

40 Gas valve

49 Observation window

102 Piezo

Fig. 4 Minimum clearances

Model GWH 260

TOP (A) 12 inches (306 mm)

FRONT (B) 4 inches (100 mm)

BACK 0 inches

SIDES 4 inches (100 mm)

BOTTOM (C) 12 inches (306 mm)

Dimensions inches

(mm)

GWH 260 PN

A12.20” (310)

B22.83” (580)

C9” (228)

D4” (100)

E20.71” (526)

F2.36” (60)

G1” (25)

H1/2”

Table 1 Dimensions in inches (mm)

6 720 608 126

Installation instructions

3 Installation instructions

3.1 Introduction

Please follow these instructions. Failure to follow

instructions may result in:

BDamage or injury.

BImproper operation.

BLoss of warranty.

If you are unable to perform the tasks required to install

this heater properly, please contact a locally licensed

plumber or gas technician.

Please contact Bosch Water Heating with any

questions.

3.2 Proper location for installing your

heater

Carefully select the location of the water heater. For

your safety and for proper heater operation, you must

provide combustion air to the heater and a proper

exhaust vent system.

Follow the guidelines below:

B1. Locate the heater where venting, gas and

plumbing connections are feasible and convenient.

B2. The hot water lines should be kept short to save

energy. Centrally locating the water heater is best. It

is always best to have hot water lines insulated.

3.3 Heater placement and clearances

The GWH 260 PN is design certified for installation on

a combustible wall (see 3.4 Mounting installation)

provided the wall is not covered with carpet or other

fabric material. For installations in an alcove or closet,

maintain the minimum clearances to combustible and

non-combustible materials listed below. See also Fig. 4.

A. Top 12 inches (306 mm)

B. Front 4 inches (100 mm)

C. Back 0 inches

D. Sides 4 inches (100 mm)

E. Bottom 12 inches (306 mm)

Warning: The water in this water

heater is cold and always remains cold

except for the times that hot water is

being used. DO NOT INSTALL IN AN

AREA WHERE IT COULD FREEZE.

Drain the heater entirely if freezing

temperatures are anticipated in area

where heater is installed. See chapter

4.5 for draining instructions.

To prevent freeze damage from residual

water in the heater, introduce short

bursts of compressed air (20-40psi)

through these connections to remove

the residual water in the horizontal

pipes and water valve.

Warning: Flammable materials,

gasoline, pressurized containers, or any

other items or articles that are potential

fire hazards must NOT be placed on or

adjacent to the heater. The appliance

area must be kept free of all

combustible materials, gasoline and

other flammable vapors and liquids.

Warning: The heater must be isolated

from the gas supply piping system

during any pressure testing of that

system at test pressures equal to or

more than 0.5 psig.

Warning: Place the heater in a location

where water leaks will do NO DAMAGE

to adjacent areas.

6 720 608 126

Installation instructions

3.4 Mounting Heater

Remove cover and inspect.

BRemove the temperature control.

BUnscrew the cover fixing screws, see Fig. 6.

BRemove the outer case by sliding it forwards and

then lifting upwards.

BEnsure that the flue terminal is clear.

BAfter inspection, replace front cover and tighten

screws.

Install incandescent particle tray.

BInstall incandenscent particle tray using screws

provided as shown in Fig. 5.

Fig. 5 Incandescent particle tray illustration

Mounting heater.

The GWH 260 PN is design certified for mounting on a

wall.

The heater must be mounted on a wall using

appropriate anchoring materials. If wall is a stud wall

sheathed with plasterboard, it is recommended that

support board(s), either 1x4’s or 1/2" (minimum)

plywood first be attached across a pair of studs and

then the heater should be attached to the support

boards, see Fig. 7.

BSecure the two included L shaped hooks to wall

studs or support board 13 1/4” apart. (See Fig. 7).

BHang heater on two L shaped hooks. (See Fig. 8).

Fig. 6 Remove front cover

Fig. 7 Support board

Fig. 8 Secure heater to wall

Warning: before starting installation:

Bcheck that there are no loose parts

inside the appliance

Bensure that gas pipe, gas valve, and

burner have no damage and are

properly fitted.

BRead chapter 2.2 to verify proper gas

type and to check all parts are included

in box.

Front cover should be removed in order to

inspect components visually (see

instructions below).

Warning:

BDo not install this appliance on a

carpeted wall.

Incandescent particle tray

Screws

6 720 608 126

Installation instructions

3.5 Combustion air requirements

The BOSCH PRO water heater holds cold water in its

copper heat exchanger and water valve when not in use.

Because of this, any cold air that comes down through

the unit's vent pipe is capable of freezing these

components. This Installation Manual specifies the

minimum vertical vent pipe and the amount of

combustion air required for this unit. When all

requirements are followed, the unit will operate properly

and safely. However, there may still be a risk of freezing

due to negative draft if all the combustion appliances in

the building or structure are not being supplied with a

sufficient amount of make-up air. A wood stove or

furnace can pull outside air down through the BOSCH

PRO vent pipe and across the heat exchanger tubing. If

the air is cold enough, the heat exchanger is at risk of

freezing and bursting. Supplying more combustion air

for all combustion appliances is the solution. Follow the

instruction on venting and checking the adequacy of

make up air. A HVAC specialist should be consulted on

how to provide more combustion air if necessary.

Observe the following instructions concerning

combustion air.

Appliances located in unconfined spaces:

a) An unconfined space is one whose volume is greater

than 50 cubic feet per 1000 Btu per hour of the

combined rating of all appliances installed in the space.

That would be 5850 cubic feet for the BOSCH PRO

GWH 260 PN alone.

b) Installations in structures that have been tightly

constructed (air infiltration rate of 0.40 ACH or less)

must be provided for combustion air per the National

Fuel Gas Code. Consult a HVAC specialist if your air

infiltration rate is questionable.

Appliances located in confined spaces:

The confined space must be provided with two

permanent openings, one commencing within 12

inches of the top and one commencing within 12 inches

of the bottom of the enclosure. Each opening must have

a minimum free area of one square inch per:

• 1000 Btu/hr if all air is taken from inside the building.

• 2000 Btu/hr if all air is taken from the outside by

horizontal ducts.

• 4000 Btu/hr if all air is taken from the outside by

direct openings or vertical ducts.

Or the confined space must be provided with one

permanent opening or duct that is within 12 inches of

the ceiling of the enclosure. This opening must have a

minimum free area of one square inch per:

• 3000 Btu/hr if all air is taken from the outside by a

direct opening or vertical duct.

Louvers, grills and screens have a blocking effect. If the

effective free area is not known, increase the sizes of

your openings by 400% if your louvers are wood and by

135% 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 outside.

6 720 608 126

Installation instructions

3.6 Venting

BMinimum vent pipe diameter: 4 inches

BMinimum vertical vent height: 6 feet, with no elbows

BEstablish 12 inch rise before any elbow

The heater must be vented to the outside following all

local ordinances and specifications for installing a gas

appliance vent or chimney. The heater must be located

as close as practicable to a vertically rising chimney or

vent that has a listed vent cap at its termination point.

The venting system must be designed and constructed

so as to develop a positive flow adequate to remove flue

gasses to the outdoors. Consult the National Fuel Gas

Code if the vent will have elbows or share venting with

another natural draft appliance.

3.6.1 Horizontal venting

3.6.2 Vertical venting

BA 4 inch diameter gas vent constructed of double

wall Type B gas vent is recommended. Under no

circumstances should the vent pipe be reduced in

size.

BAn approved gas vent connector must be attached to

the top of the water heater and rise vertically at least

12" before entering into an approved gas vent

connector elbow.

BThe minimum vertical gas vent height allowed is 6

feet; horizontal vent connectors and elbows are not

to be considered in the total gas vent height.

BAll gas vent sections must be secured to each other

with sheet metal screws and be properly supported.

Horizontal runs:

Any gas vent section that is greater than 45 degrees

from the vertical is considered horizontal. Horizontal

sections must slope upwards at least ¼ inch for every

foot of its horizontal length and be properly supported.

Keep the horizontal section short and avoid too many

elbows. The maximum horizontal run allowed is half of

the total vertical vent height; horizontal vent connectors

and elbows are not to be considered in the total gas

vent height.

Vent termination:

The gas vent constructed of double wall Type B gas

vent must terminate above the roof surface with a listed

vent cap at a height that's in accordance with Fig. 10

and table 2, provided it is at least 8 feet (2.4 m) from a

vertical wall or similar obstruction. All other gas vents

that are not able to terminate within the minimum

specified height allowed must terminate not less than 2

feet (0.6 m) above the highest point where it's passed

through the roof and at least 2 feet (0.6 m) higher than

any vertical wall or similar obstruction within 10 feet (3.1

m).

Fig. 9 Flat roof

Danger: Do not reduce the vent pipe

size. Do not put an elbow directly on top

of heater. Failure to follow venting

requirements may cause dangerous

exhaust gases to enter living space.

Warning: Do not combination vent with

a mechanically vented appliance.

Warning: Horizontally venting to a

vertically constructed vent stack along

an outside wall of a building is not

permissible.

Warning: Horizontally venting to a

sidewall vent terminator is not

permissible

LISTED VENT CAP

MINIMUM 6

FEET (1.8M)

LISTED GAS VENT

ESTABLISH A ONE

FOOT RISE BEFORE

ANY ELBOWS

6 720 608 126

Installation instructions

Masonry chimney

Masonry chimneys shall be built and installed in

accordance with NFPS 211 or local codes. A minimum

4" diameter gas vent pipe (metal double wall Type B),

or an approved clay flue liner or a listed chimney lining

system must be used when venting into a naturally

drafting, internal masonry chimney. Local codes may

require the use of both gas vent and an approved lining

system when venting into a masonry chimney. The

Commonwealth of Massachusetts requires the use of a

listed liner. Lining systems include approved clay flue

lining, a listed chimney lining system or other approved

material that will resist corrosion, erosion, softening, or

cracking from exhaust flue gases at temperatures up to

1800 degrees F. The lining system must be listed for

use with naturally drafting, draft hood equipped gas

appliances. Follow local codes and refer to NFGC 54

and NFPA 58.

Existing interior masonry chimney

The metal gas vent pipe should be permanently

mounted inside the masonry chimney. Double wall Type

B gas vent is recommended. The masonry chimney may

have to be tile or metal lined before the insertion of the

gas vent pipe; check local codes for clarification. The

lining material must be listed for use only with naturally

drafting, draft hood equipped gas appliances. Follow

manufactures instructions for installation of listed lining

material. You may not vent any other fuel burning

appliances into any free space remaining in the

chimney. The minimum vertical gas vent length within

the masonry chimney should be no less than 6 ft (1.8

m); the vent terminator should extend at least 3 feet (0.9

m) above where the chimney meets the roofline and at

least 2 feet (0.6 m) higher than any vertical wall or

similar obstruction within 10 feet (3.1 m). The top of the

gas vent should have an approved vent terminator. See

Fig. 11.

Fig. 10 Pitch roof

Fig. 11 Masonry chimney

LISTED VENT CAP

LOWEST DISCHARGE

OPENING

MINIMUM 6

FEET (1.8M)

ROOF

PITCH IS

X/12

LISTED GAS VENT

H (minimum) height

from roof to lowest

discharge opening

ESTABLISH A ONE

FOOT RISE BEFORE

ANY ELBOWS

GAS VENT TERMINATIONS FOR LISTED VENT CAPS

Roof pitch H (minimum) feet meters

Flat to 6/12 1.0 0.30

6/12 to 7/12 1.25 0.38

Over 7/12 to 8/12 1.5 0.46

Over 8/12 to 9/12 2.0 0.61

Over 9/12 to 10/12 2.5 0.76

Over 10/12 to 11/12 3.25 0.99

Over 11/12 to 12/12 4.0 1.22

Over 12/12 to 14/12 5.0 1.52

Over 14/12 to 16/12 6.0 1.83

Over 16/12 to 18/12 7.0 2.13

Over 18/12 to 20/12 7.5 2.27

Over 20/12 to 21/12 8.0 2.44

Table 2

GAS

VENT

LISTED

VENT CAP

VENT

CONNECTOR

Establish a

one foot

rise before

any elbows

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