Bosch Appliances W 125-T1, W125K User Manual

Instantaneous gas water heater

Models

W 125...T1

•installation

•operation

•maintenance

The Bosch instantaneous water heater is a high efficiency, space saving answer to your water heating needs. All Bosch instantaneous water heaters heat water only as required; no energy is lost maintaining a large volume of water at elevated temperatures as in tank-type storage water heaters.

Suitable for heating potable water only – not approved for space heating purposes.

6 720 606 447 CA (05.05) AL

READ INSTRUCTIONS CAREFULLY BEFORE INSTALLING

NOTICE TO INSTALLER: Please leave this manual with the owner or affix adjacent to appliance.

ASTRAVAN DISTRIBUTORS, LTD.

123 Charles Street

North Vancouver, B.C. V7H 1S1 Phone Canada: [phone] Phone USA: [phone] Web Site: www.astravan.com

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 vapors and liquids in the vicinity of this or any other applicance.

-WHAT TO DO IF YOU SMELL GAS

•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.

Note: In case of problems please contact your salesman or installer

DIMENSIONS

Figure 1

Maximum hydrostatic water pressure - 0.97 MPa (150 p.s.i.) Maximum recommended working pressure - 0.69 MPa (100 p.s.i.)

Minimum working pressure - 0.01 1 MPa (2 p.s.i.) at 1.6 Litres/min. (0.5 U.S. Gal/min.) free discharge Minimum recommended inlet water pressure for use with showers 40 p.s.i.g.

NG

Altitude

LPG

Altitude

Standard

High

Standard

High

Tap pressure inch

5,7

4,6

Tap pressure inch

10,5

8,4

Manifold burner pressure inch

3,35

2,7

Manifold burner pressure inch

10,2

8,1

Dimensions in millimetres (inches)

A

B

C

D

E

F

G

H

I

J

270

610

230

190

70

562

350

312

102

138

(10 5/8)

(25 3/8)

(9 1/8)

(7 1/2)

(2 3/4)

(22 1/8)

(13 3/4)

(12 1/4)

(4)

(5 3/8)

Model

Type of Gas

Altitude

Input

Main Burner Orifices

Size, mm

Qt.

W 125 K…

natural

standart

11.7 kW

1.25 diam.

6

propane

(0-2,000 ft.)

(40,000 Btu/hr)

0.76 diam.

6

W 125 K…

natural

high *

10.5 kW

1.25 diam.

6

propane

(2,000-4,500 ft.)

(36,000 Btu/hr)

0.76 diam.

6

*The high altitude ratings listed are Canadian Gas Association high altitude ratings and are only valid in Canada. In the U.S., the National Fuel Gas Code, ANSI Z223.1/NFPA 54 recommends for high altitude installations above 2,000 feet, that the input rate be reduced 4% for each 1,000 feet above sea level.

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FORWARD

This design complies with CAN 1-4.3-77 and ANS1 Z21.10.3b 1994 as an instantaneous gas water heater. In addition the unit complies with CAN1-2.17-M80 for use at high altitude, 2.000-4.5000 feet above sea level.

Instalation, operation and maitenance information is provided in this manual. Installation and operation instructions should be thoroughly reviewed before proceeding with installation of the BOSCH instantaneous gas water heater.

The BOSCH instantaneous gas water heater is designed to operate on natural or propane gas; however, make sure that gas on which heater is to operate is the same as specified on the heater’s model/rating plate.

In addition to these instrutions,the water heater shall be installed in accordance with CAN1-B149 Installation Code (in Canada) or ANSI Z223-1/NFFA 54 National Fuel Gas Code (in U.S.) and/ or local installation cades. These shall be carefully followed in all cases.

INSTALLATION INSTRUCTIONS

Note: Proper plumbing, venting, gas connections and an adequate supply of combustion air are required for safe and reliable operation. Ability equivalent to that of a licensed tradesman in the field involved is required for installation and/or servicing of these water heaters.

LOCATION

Before installing the BOSCH instantaneous gas water heater consideration must be given to proper location. The BOSCH W125K... instantaneous gas water heater may be installed to supply hot water to remote locations. Location should be as close to a chimney or gas vent as practical, in an area with an adequate air supply and as centralized with the piping system as possible. The heater should not be located in an area where it will be subject to freezing. The heater should be located in an area where leakage of the heater or its connections will not result in damage to the area adjacent to the heater or to lower floors of the structure.

Note: When such locations can not be avoided, it is recommended that a suitable drain pan, adequately drained, be installed under the heater. The pan must not restrict combustion air flow.

AIR REQUIREMENTS

For safe operation, sufficient air for combustion, ventilation and dilution of flue gases must be available. An insufficient supply of air will result in a yellow luminous burner flame, causing carboning or sooting of the heat exchanger.

In unconfined spaces, in buildings of normal construction, infiltration normally is adequate to provide air for combustion, ventilation and dilution of flue gases. However, a confined space must be provided with two permanent openings to provide combustion and ventilation air to the appliance. Each opening shall have a free area of on square inch per 1,000 Btu/hr of total input rating of all the appliances in the enclosure, but not less than 100 square inches. One opening shall be within 12 inches of the top and one within 12 inches of the bottom of the enclosure.

For either a confined or unconfined space in a building of tight construction, with inadequate infiltration, air must be drawn from the outdoors or from spaces that freely communicate with the outdoors. Two permanent openings located as indicated above are to be provided as follows:

1.When communicating with outdoors directly, or by means of vertical ducts, each opening shall have a free area of not less than one square inch per 4,000 Btu/hr of total input of all appliances in the space.

2.When communicating with outdoors by means of

horizontal ducts, each opening shall have a free area of not less than one square inch per 2,000 Btu/hr of total input of all appliances in the space.

3

WARNING

1.Flammable materials, gasoline, pressurized containers, or any other items or articles that are potentially fire hazards must never 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.

2.Do not obstruct the flow of combustion and ventilation air to the appliance.

CLEARANCES

This heather is designed certified for installation on a combustible wall, in an alcove with minimum clearances to combustible construction of 51mm (2 inches) from sides, 305mm (12 inches) from top and bottom. A minimum of 305mm (12 inches) shall be allowed for maintenance of serviceable parts. Clearance from vent is dependent upon the clearance rating of the venting material used; that is type B-1 vent is approved for 1 inch clearance, B-2 vent for 2 inch, etc.

MOUNTING

The W125K…is designed certified for mounting to a wall. The heather must not be installed directly on a carpeted wall.

The heather must be mounted to the wall using appropriate anchoring materials, through the four holes provided.

Expansion and contraction of piping due to changing water temperature in pipes imparts movement to heater which, if mounted directly to a brittle, board such as plasterboard can cause failure of mounting.

Heater must be mounted level to assure proper operation.

VENTING

The BOSCH model W125K… instantaneous gas water heater has a built-in a draft diverter is designed for indoor installation only. The draft diverter outlet must be connected to a clear, unobstructed vent of the same size or larger, refer to:

-In Canada, CAN 1-B149 Installation Code for detailed requirements

-In U.S., ANZI Z223.I/NFPA 54 National Fuel Gas Code for detailed requirements

-The minimum length of a vertical vent up to the terminal must be 2 ½ feet.

WATER CONNECTIONS

The W125K comes supplied with a ½’’ NPT cold water inlet adapter and a flexible wire braid hot water outlet with a ½’’ NPT connection.

G772_179

Figure 2

RELIEF VALVE

The listed pressure relief valve supplied must be installed near the hot water outlet at time of installation of the heater. No valve is to be placed between the relief valve and the heater. A drain line must be connected to the relief valve to direct discharge to a safe location. Do not install reducing coupling or any other restriction in the discharge line. The discharge line must be installed so as to allow complete

drainage of both the valve and the line.

GAS CONNECTIONS

Before connecting the gas supply to the heater check heater’s model/rating plate to make sure that gas on which heater is to operate is the same as specified on the model/ rating plate.

The W125K…instantaneous gas water heater is supplied with a gas pipe, a gas pressure regulator and a manual gas cock that must be installed on the heater before attaching the gas supply line, see figure 3. Failure to install gas pipe, the main manual gas valve and the pressure regulator, or the failure to install them in the sequence show in figure 3 will be in violation of the A.G.A. and C.G.A. certification of the unit and can cause damage to heat changer.

BOSCH water heaters are shipped from the factory with the gas pressure regulators preset for the gas shown on the rating plate to the correct pressure.

-In Canada, for high altitude operation;

-In U.S., for standard altitude operation unless specially

marked as a high altitude unit.

4