Instantaneous gas water heater
Models W 325 K.T1 W 400 K.T2 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; noenergy is lost maintaining a large voluma of water at elevated temperatures as in tanktype storage water heaters. Suitable for heating potable water. Certified for space heating in combination with potable water only. Not certified for heating only.
READ INSTRUCTIONS CAREFULLY BEFORE INSTALLING
NOTICE TO INSTALLER: Please leave this manual with the owner or affix adjacent to appliance. WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.

CA (03.11) AL

ASTRAVAN DISTRIBUTORS, LTD.
123 Charles Street North Vancouver, B.C. V7H 1S1 Phone Canada: (604) 929-5488 Phone USA: (206) 860-8448 Web Site: www.astravan.com
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. 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 neighbors phone. Follow the gas suppliers instructions. If you cannot reach your gas supplier, call the fire department. Installation and service must be performed by a qualified installer agency or the gas supplier.
Note: In case of problems please contact your salesman or installer

DIMENSIONS

Figure 1 Maximum hydrostatic water pressure 1.03 Mpa (150 p.s.i.) Maximum recommend working pressure 0.69 Mpa (100 p.s.i.) Minimum working pressure 0.0138 Mpa (2 p.s.i.) at 2 Litres/min. (0.5 U.S. Gallons/min) free discharge Minimum recommended inlet water pressure for use with showers 30 p.s.i.g. Dimensions in Milimetres (inches)
Model W325 W400 A 1/4" 1/4"
Model Type of gas Natural Propane W325 Natural Propane W400 Natural Propane W400 Natural Propane high** (2,000 - 4,500 ft.) 30.85 kW ( 105,000Btu/hr) 0.82 diam. 16 standard (0 - 2,000 ft.) 34.28 kW (117,000Btu/hr) 0.82 diam. 1.25 diam. high** (2,000 - 4,500 ft.) 26.37kW (90,000Btu/hr) 25.05 kW (85,000Btu/hr) 0.79 diam. 1.25 diam. 14 16

B 3/4" 1/4"

C 3/4" 3/4"
Altitude standard (0 - 2,000 ft.)
D 155 6" 155 6"

E 1/4" 1/4"

Input 29.30kW (100,000Btu/hr) 27.83 kW (95,000Btu/hr)
F 130 5" 130 5"

G 1/8" 1/8"

H 5/8" 5/8"
Main Burner orifices Size, mm 1.25 diam. 0.79 diam. 1.25 diam.

Qt. 14

The wall bracket is only required for the WR 325 K when mounted directly to combustible construction. The WR 400 K T2 may be mounted directly to combustible construction.
** 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. See page 8.

FORWARD

This design complies with CAN1-4.3-77 and ANS1Z21.10.3b 1994 as an instantaneous gas water heater. In addition the unit complies with CAN1-2.17-M80 for use at high altitude, 2.000-4.500 feet above sea level. Installation, operation and maintenance information is provided in this manual. Installation and operation instrution should be thoroughly reviewed before proceeding with installation of the BOSCH instantaneous gas water heater. The BOSCH instantaneous gas water heater is designedto operate on natural or propane gas; however, make sure that gas onwhich heater is to operate is to operate is the same as specified on the heaters model/rating plate. In addition to these instructions, 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 codes. These shall be carefully folowed in all cases.

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

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 one square inch per 1000 BTU/Hr* of total input rating os all appliances in the enlosure.One opening shall be within 12 inches of the top and one within 12 inches of the bottom of the enclosure. * SPECIAL NOTE When the W 400 K T2 is installed in a confined space of minimum size the openings described above must be increased to a size of 1 square inches per 1000 BTU/Hr. In other words, for the W400 K.T2 installed in a minimum sized confined space the two openings that are to be made in the enclosure within 12 inches of the top and 12 inches of the bottom must each have a minimum free area of, (11/ 2) x (117) = 175.5 square inches.

LOCATION

Before installation the BOSCH instantaneous gas water heater consideration must be given to proper location. Location should be as close to a chimney or gas vent as practicable, in an area with an adequate air supply and as centralized with the piping system as possible. The heater should not not be located in 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. In order to prevent corrosion, make sure that the combustion air kept free of aggressive substances. Subtances that especially contribute to corrosion are halogenated hydrocarbons (e.g. chlorine and fluorine), which are contained in solvents, paint, adhesives, propellant gases, various house hold cleaners, etc. Take precautionary measures as necessary. If plastic pipes are used , a 1.5 m metal connection must be provided on the cold and hot sides. Note: When such loctions cannot be avoided, it is recommended that a suitable drain pan, adequately drained, be installed under the water heater. The pan must not restrict combustion air flow.
For either 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 the outdoors. Two permanent openings located as indicated above are to be provided as follows: 1. When communicating with outdoor directly, or by means of vertical ducts, each opening shall have a free area of not less than one square inch per 4000 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 2000 BTU/Hr of total input of all appliances in the space. For detailed reqirements see in Canada, CAN 1-B 149 Installation Codes in U.S., ANSI Z223.1/NFPA 54 National Fuel Gas Code.

MOUTING

The W 325 K. and W 400 K. are design certified for mounting to a wall. A wall bracket, see figure 1 is provided with the W 325 K. and must be used when the heater mounted on a combustible wall. Heaters may not be installed directly on a carpeted wall. The heater, or the wall bracket, must be mounted to the wall using appropriate anchoring materials.

WARNING

Failure to use the wall bracket with the W 325 K when installing the unit on combustible construction will cause an unsafe condition and possible fire. In addition, failure to use the wall bracket when installing the W 325 K on combustible construction will be in violation of A.G.A. and C.G.A. certification of the unit. Note: If wall is a stud wall sheethed with plasterboard it is recommended that support board(s), either 1 x 4s or (minimum) plywood first be attached across a pair of studs and then heater, in the case of the W 400 K, or the wall bracket, in the case of the W 325 K, be attached to the support boards. See figure 2.
WARNING 1. Flammable materials, gasoline, pressurized containers, or any other items or articles that are potentially fire hazards must never be placed on or adjacant 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 combuston and ventilation air to the appliance. CLEARENCE In Canada The W 325 and the W 400 are design certified for installation on a combustible wall (for the W 325 the wall bracket supplied with the unit must be used for mounting to combustible construction), and for installation in an alcove or closet with minimum clearances to 0 mm from back, 102 mm (4 inches) from sides, 305 mm (12 inches) from top and bottom, and 102 mm (4 inches) from front. A minimum of 305 mm (12 inches) shall be allowed for maintenance of serviceable parts. Clearence from vent is dependant upon the clearence rating of the venting material used; that is, type B-1 vent is approved for 1 inch clearence, B-2 vent for 2 inch, etc. In United States The W 325 and the W 400 are design certified for installation on a combustible wall (for the W 325 the wall bracket supplied with the unit must be used for mounting to combustible construction), and for installation in an alcove with minimum clearences to combustible construction of 0 mm from back, 102 mm (4 inches) from sides, 305 mm (12 inches) from top and bottom. In addition, the WR 325 has also been design certified for closet installation with minimum clearences to combustible construction of 0 mm from back, 102 mm (4 inches ) from sides, 305 mm (12 inches) from top and bottom, and 102 (4 inches) from front. A minimum of 305 mm (12 inches) shall be allowed for maintenance of serviceable parts.Clearence from vent is dependent upon the clearence rating of the venting material used, that is, type B-1 vent is approved for 1 inch clearence, B-2 vent for 2 inch, etc.

WALL STUDS

WALL BRACKET

Figure 2

1 X 4 SUPPORT BOARDS
Expansion and contraction of piping due to changing water temperature in pipes imparts movement to heater which, if mounted directly to a brittle, friable board such as plasterboard can cause failure of mounting.

DRIP TRAY

If the water heater is being mounted above a floor of combustible construction, the drip tray ( shipped loose in the water heater) must be attached to the bottom of front cover of the water heater at time of installation. The drip tray should be attached to the front cover, using screws provided, as shown in figure 3. Failure to use drip tray when installing unit above a floor of combustible construction will cause an unsafe condition and possible fire and will be in violation of A.G.A. and C.G.A. sertification of the unit.
For high altitude use the adaptor must be installed as shown in figure 4, without alternation, before connecting the six inch flue to the unit. The adaptor must be secured to the draft diverter outlet with a minimum of two screws. Also, in Canada, the gas pressure regulator supplied with the water heater is factory preset to deliver gas to the water at the proper pressure settting for high altitude operation, see PRESSURE REGULATION section of this manual.
Failure to increase vent size on W 400 to six inches and/or to assure that manifold pressure is set to proper value listed on rating plate for applications at altitudes in range 2,000 to 4,500 ft. above sea level will cause unsafe venting, asphyxiation, and voids C.G.A. certification.

WATER CONNECTIONS

The W series instantaneous water heatrs are provided with two S-bend water connectors/adaptors that must be connected to inlet and oulet and outlet connections on water valve assembly, see figure 1 and figure 5 below. DRIP TRAY Figure 3

VENTING

The BOSCH instantaneous water heaters have builtin draft diverters and are designed for indoor installation only. The draft diverter outlet must be connected to a clear, unobstructed vent of the same size, or lerger, refer to: In Canada, CAN1-B149 Installation Code for detailed requirements. In U.S.A., ANSI Z223.1/NFPA 54 National Fuel Gas Code for detailed requirements. Water valve and S-bends, top view Figure 5 The purpose of the S-bend water connectors/adaptors is to provide threaded water connections that meet standards used in North America, ANSI Standard Taper Pipe Thread (1/2 NPT). The cold water supply should be connected to S-bend attached to inlet of water valve and hot water connection should be made to S-bend attached to outlet of water valve. Note: A shut-off valve should be placed in the cold water supply line to the heater to facilitate servicing the heater.

The flue connection for both the W 325 K and W 400 K is 130 mm (5 inches); however, in Canada for installations at high altitude (2,000-4,500 ft. above see level) a six inch (6) flue is required for the W 400 K.
5 x 6 adaptor used on high altitude model W 400 only

Figure 4

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 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 must be installed so as to allow complete drainage of the valve and the line. See figure 6.
BOSCH water heaters are shipped from the factory with the gas pressure regulators preset for tte 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 altiude unit. Check to make sure that the gas listed on the rating plate is same as gas listed on the pressure regulator. See PR ESSU R E REGU LATION of this manual for information regarding gas pressure settings. Note: Before attaching the gas supply line, be sure that all gas pipe is clean on the inside. To trap any dirt or foreign material in the gas suplly line, a drip leg must be incorporated in the piping. The drip leg must be readily accessible and not subject to freezing conditions. Install in accordance with recommendations of serving gas supplier.

Figure 6

GAS CONNECTIONS
Before connecting the gas supply to the heater check heaters model/rating plate to make sure that gas on which heater is to operate is the same as specified on the model/ rating plate.
Joint compounds (pipe dope) shall be applied sparingly and only to the male threads of pipe joints. Do not apply compound to the first two threads. The joint compound used must be resistant to the action of liquified petroleum gases. Before placing water heater in operation check for gas leakage. Soap and water solution, or other material acceptable for this purpose, shall be used in locating gas leaks. Matches, candles, lighters, or other ignition sources shall not be used for this purpose.
The heater and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressure in excess of 3,45 kPa (1/2 psig).
The W 400 K and the W 325 K instantaneous gas water heaters are supplied with a gas pressure regulator that must be installed on the heater before attaching the gas supply line, see figure 7. Failure to install the pressure regulator, or the failure to install it in the sequence shown in figure 7 will be of A.G.A. and C.G.A. certification of the unit.
The water heater must be isolated from the gas supply piping system by closing its individual manuaql shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 3.45 kPa (1/2 psig).

PRESSURE TAP PRESSURE REGULATOR MANUAL GAS VALVE
The water heater, including the pressure regulator and manual valve provided with it, must not be operated at gas supply pressures in excess of 3.45 kPa (1/2 psig). If overpressure has occurred such as through improper testing of the gas lines or emergency malfunction of the supply, the gas valve and regulator must be checked for safe operation. Make sure that the outside vent valves are protected against blockage. These are part of the gas supply system, not the water heater.Vent blockage may occur during ice storms.

Figure 7

OPERATING INSTRUTIONS
If the water has been damaged or exposed to fire or sooting or if any part has been underwater do not use. 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 and to clean the heat exchanger assembly and water valve.

LIGHTING INSTRUCTIONS

1. 2. STOP! Read the safety information, first section of the Lighting Instruction Plate on the cover. The main manual gas valve must be closed (turn valve handle clockwise ) and the gas valve OFF button depressed. See figure 9. Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow B in the safety information given above on this plate. If you dont smell gas, go to next step. The pilot burner is located behind the peephole located in the front center of the jacket directlybelow this instrution plate. Open main manual gas valve by turning valve handle counterclockwise. Depress PILOT button and light pilot by pushing PILOT IGNITER button. This may have to be repeated. Observe pilot flame though peephole. The PILOT button should be held down at least 10 seconds with pilot burning. When the PILOT button is released the pilot should continue to burn. If the PILOT button does not pop up when released stop and immediately call your service technician or gas supplier. If the pilot will not stay repeat lighting procedure steps 1 through 8. If the pilot will not stay lit after several tries, depress the OFF button , turn the manual gas valve handle clockwise to OFF position and call your service technician or gas supplier.

FILLING

Before proceeding with operation of the water heater make sure that system is filled with water. Make sure drain is closed, see figure 8, below. Open a nearby hot water faucet to permit the water to fill the heater and piping. Close the hot water faucet after the water flows freely and all air has escaped from system. The water heater is now ready to be lit. 4.

Figure 8

SERVICE HINT
The strainer (screen) in the water valve, located in the inlet of the water valve, may require occasional cleaning due to foreign material in the water supply. This will restrict the flow of may affect heater operation and prolong filling time. To inspect the strainer close the cold water supply valve ahead of the heater, disconnect S-bend from inlet of water valve, and remove strainer from inlet. Clean if required, replace strainer in inlet to water valve, reconnect S-bend and turn on water supply. Light the water heater in accordance with the instructions on the Lighting and Operating Plate on the water heater. For your convenience, the instructions are repeated below.

8. Depress the ON button. The heater will now fire when water is drawn at arate greater than the threshold flow rate (see manual)*. Note: If main burner should fail to ignite make sure pilot is burning. If not repeat lighting procedure steps 1 through 8.
TO TURN OFF GAS TO APPLIANCE
1. Depress OFF buton and close the main gas valve by turning handle clockwise to OFF position. See figure 9.
*see Water Flow Selector section.

PRESSURE REGULATION

The pressure regulator supplied with the water heater is adjusted to operate on the gas specified on the rating plate, and: in Canada, is factory preset to deliver gas at the high altitude pressure setting listed on the rating plate and as shown below. In the U.S., is factory preset to deliver gas at the standard altitude setting listed on the rating plate and as shown below. The pressure setting of the gas pressure regulator should be checked at installation to assure that the setting is correct for the gas being used and the altitude at which the appliance is installed. See rating plate on the unit, or the chart below for proper settings. In Canada, for a heater being installed at standard altitude (o-2,000 ft. elevation) the manifold pressure should be reset at installation to value shown on the rating plate, or chart below, for standard altitude. The gas pressures specified below refer to flow pressure taken at the pressure tap in the gas inlet pipe (just above pressure regulator), figure 9, while the heater is operating at full input.
TEMPERATURE REGULATION I W325K and W400K Models only
For domestic purposes the water flow selector should be turned clockwise to stop and the gas control slide slid to right hand stop and remain in those positions. See figure 10. Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the appliance and have the heater checked by a qualified serviceman to determine the reason for te malfunction.

GAS CONTROL SLIDE

Appliance Regulator Pressure Setting
Pressure Model Type of Gas kPa W325 W325 W400 W400 natural propane natural propane natural propane natural propane 1.36 2.61 1.09 2.11 1.41 2.61 1.14 2.09 Inches, W.C. 5.5 10.5 4.4 8.5 5.7 10.5 4.6 8.4 standard (0-2,000 ft.) high * (2,000 - 4,500 ft.) standard (0-2,000 ft.) high * (2,000 - 4,500 ft.) Altitude
WATER FLOW SELECTOR KNOB W325K AND W400K ONLY WATER THROTTLE SCREW W400K5 MODEL ONLY

Figure 10

*Note: The high altitude ratings listed are Canadian Gas Association high altitude ratings for the appliances 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 2000 feet, that the input rate be reduced 4% for each 1,000 Feet above sea level. Your appliance dealer and/or your local gas supplier should be consulted in regard to any high altitude installation. If field adjustment is required it should be performed by a qualified serciveman experienced in such work.

WATER FLOW SELECTION With the water flow selector turned clockwise to the stop, the heaters water valve will regulate the flow rate through the heater permitting a maximum flow rate of: 5.8 L/Min. (1.5 U.S. Gal./min.), for W325 6.8 L/Min. (1.8 U.S. Gal./min.), for W400
This setting permits a person at a remote location to control the water temperature by mixing more or less cold water with the hot water supplied by the heater.
PRESSURE TAP PRESSURE REGULATOR MANUAL GAS VALVE IN OFF POSITION

Figure 9

The water flow selector regulates the hot water output by adjustng the flow rate of the water through the heater. Below you will find listed the maximum that can be selected by adjusting the water flow selector and the minimum flow rate for main burner operation. Also listed are the temperature rises that would be expected, at flow rates indicated, when the heater is firing at full input.
WATER FLOW ADJUSTMENT RATE ALL MODELS
Model Maximum Flow Rate (counter-clockwise to stop) Minimum Flow Rate (clockwise to stop)
13 L/min. 5.8 L/min. (1.5 (3.4 U.S. Gal./min.) Temp. U.S. Gal./min.) Temp. Rise 25 C (45 F) Rise 55 C (100 F) 15 L/min. (4.0 6.8 L/min. (1.8 U.S. Gal./min.) Temp. U.S. Gal./min.) Temp. Rise 25 C (45 F) Rise 55 C (100 F)
*Note: If flow rate through the heater is less than the minimum flow rate shown for the heater the main burner will not fire. The minimum flow rate is the THERSHOLD FLOW RATE referred to in the lighting instructions. II W400 K5 Models only These models do not have a manual flow selector knob. Flow can be regulated using the water throttle screw on the bottom of the water control valve (see fig.8). Because this model is usually always used for full flow applications such as recirculation to storage, pressure washers, boosters, etc., this water throttle screw somes from the factory srewed in (clockwise) to maximum flow position to give flows and temperature indicated above. GAS CONTROL SLIDE With the gas control slide at the right hand stop the heater will fire at its full rated input when water is drawn at a rate that will cause the gas valve to open fully. The gas control slide will restrict the input down to approximately 50% of full rated input when adjusted to the left hand stop. HIGH TEMPERATURE LIMIT SWITCH The BOSCH W series instantaneous gas water heaters are equipped with a high temperature switch with a set point of approx. 90 C ( 194 F). If the water temperature at the point exceeds the set point the switch will open, interrupting the safety circuit and stopping gas flow to the pilot and main burner. Outage as a result of high limit operation indicates that the heater is not functioning properly. The heater should be checked by a qualifed serviceman and reason for malfunction corrected. To relight pilot follow instructions provided on unit.

PREVENTIVE MAINTENANCE

PILOT AND MIAN BURNER Check pilot and main burners at least every 12 months for proper flame characteristics. The proper flame should envelop approximately 10 mm (3/8 inch) of tip of thermocouple. If the main burners fail to exhibit above characteristics they must be cleaned, either by blowing them off with compressed air or by washing them in soap and water and rinsing. If it proves necessary to wash the main burner assembly the following procedure should be used: 1- Turn off the gas supply to the water heater. 2- Disconnect pilot gas tube at the gas valve and unscrew the gas manifold assembly union nut, where the gas manifold inlet pipe connects to the gas valve and remove the gas assembly. 3- Wash in soap and water and then rinse. 4- Reassemble Check for gas leaks after reassembly and correct as required. 5- Refer to Lighting Procedure to relight the heater.
Figure 11 If the pilot flame is too small, then the pilot burner must be cleaned. The position of the igniter electrode should also be checked to assure that electrode is approximately 3mm (1/8) from pilot, see figure 11. The main burner should exhibit the following characteristics: - Provide complete combustion of gas. - Cause rapid ignition and carryover of flame across burners. - Operate quickly during ignition, burning, and extinction.
The vent piping and finned heat exchanger should be checked at least once a year for dust and carbon deposits, and cleaned as necessary.

PRESSURE RELIEF VALVE

At least once a year the pressure relief valve should be checked to insure that if it is in operating condition. Before testing the relief valve take necessary precautions to prevent water damage. Lift the lever on the valve several times until the valve seats properly and operates freely. Do not check the relief valve when hot water is being drawn and the main burner is on. Water exiting the valve under these conditions would be hot. If the pressure relief valve on the appliance discharges this is an indication of water pressure above the pressure rating of the relief valve. If the pressure relief valve continually discharges on a periodic basis contact the water supplier or local plumbing inspector on how to correct the situation. Do not plug the pressure relief valve.
PERIODIC REMOVAL OF LIME DEPOSITS
Figure 12 After 12 to 24 months of service, depending on frequency of use and water harness, the heater should be checked for accumulation of calcium carbonate (lime) and delimed, if necessary. Thereafter a regular schedule, based on initial inspection findings, should be set up to delime the heater.

BOSCH INSTANTANEOUS WATER HEATERS APPROVED FOR SPACE HEATING UNDER CLASS IV
When using the Bosch Models W 400-K for water heating and space heating the following requirements shall apply : All space heating equipment, piping and components connected to the heater shall be suitable for use with potable water. Toxic chemicals such as boiler treatment compounds, antifreeze etc, shall not be introduced into potable water used for space heating. When used for potable water this unit may not be connected to any heating system or components previously used solely for space heating. A temperature mixing valve must be installed where space heating temperature requirements are higher than normal domestic supply temperatures to reduce scald hazard potential. Particular care must be taken to select the correct type of thermal mixing valve to satisfy the installed application requirements, i.e. If full anti-scald protection is specified then only that type of valve must be selected that is supported by the manufacturers claim. Below is a typical schematic which should be used as a guide only. Always obey the installation instructions supplied by the mixing valve supplier.
Temperature Mixing Valve Regulator
130F Hot Water Service check valve
Feed to Space Heating Equipment
Cold Water Supply to tempering regulator

Supply to Bosch Heaters

HOT WATER STORAGE TANK
Note: These schematics and explanatory text should not be used for design purposes, but only as a general guide. Actual system design and installation must be by qualified people.
Return from Bosch Heaters and Space Heating SEPARATE PUMPS REQUIRED FOR HEATER AND CIRCULATION SYSTEM
Installations must conform to CSA B214 hydronic standard and local code requirements.

11 11a 33

Description
Front shell Cover Draught diverter Heat exchanger Connecting pipe hot Cold water pipe Washer 1/2" Temperature limit Main burner Main burner Pilot burner ( 75 ) Filter Sparking plug Pilot injector ( 5 ) Pilot orifice (49) Pilot gas pipe Thermocouple Washer 1" Throttle disc ( 7.0 ) Gas valve Gas valve Gas supply pipe Magnetic unit Washer Gas filter Termo connection Water valve Sealing screw Diaphragm Slow-ignition valve Setting screw O-ring Valve Venturi (12) Venturi (16) Water strainer water elbow fiting

Part Number for Models

W325 K.P.T1 W 400 KPT8700705472

8705505307 8705406132

LPG NG

8708120469 8708120471

NG LPG

LPG NG LPG

8707001890 8707001897

8703404092

8708205235
ASTRAVAN DISTRIBUTORS, LTD. 123 Charles Street North Vancouver, BC. V7H 1S1 Phone (Canada): (604) 929-5488 Phone (USA): (206) 860-8448 Site Internet: www.astravan.com
Chauffe-eau gaz instantan
Modles W 325 KT1 W 400 KT2 Installation Fonctionnement Entretien

PILOT ASSEMBLIES

PART 1319701
Honeywell 390686-4 Pilot Injector 0.018mm NG 390686-1 Pilot (Q314) Inj 0.010 ORI LPG(S) (Part 1319700)

PART 1319719

Honeywell Q314A9051B Pilot ASS A/K Elec Clip

PART 1319748

Honeywell Q345A2030B B/L Tip Pilot Ass

PART 1319750

Honeywell Nut & Olive 6mm

PART 1312798

Honeywell 856868 Pilot Orifice Spud 18 H/D NG

PART 2501609

Honeywell Pilot Burner 10Q 100 Aerated

PART 2501323

Honeywell Raypak HIS Q3400A1016

PART 1318619

Robertshaw 6CH 3 Way Hood NG & LPG

PART 2500163

Robertshaw 3CH Pilot Assembly

PART 1312800

Robertshaw Pilot Orifice 2BL

PART 1318063

Robert Bosch Injector 1.2mm NG TE250

PART 1318064

Robert Bosch Injector 1.25mm NG TF325TR

PART 1318077

Robert Bosch Pilot Spud LPG W250, W325, W400

PART 1318079

Robert Bosch Pilot Spud Tip W250, W325, W400 LPG Model

PART 1318093

Robert Bosch W250 Main Burner Injector 0.75mm LPG

PART 1318096

Robert Bosch 0.79mm Main Burner Injector W325 LPG

page 34

Reference

PART 1318091

Robert Bosch 1.3mm Main Burner Injector W325 N/G

PART 1318076

Robert Bosch Pilot Spud NG W400

PART 1318078

Robert Bosch Pilot Tip NG W400

PART 1318704

S.I.T. Target Pilot Injector 0.35mm NG

PART 1318728

S.I.T. LPG Pilot Injector Suit Target Pilot Assembly

PART 1318706

S.I.T. Pilot Assembly with 2 Way Head NG

PART 1318727

S.I.T. Target Pilot Assembly with Electrode

PART 1318705

S.I.T. Pilot Assembly with 3 Way Head NG

PART 1319770

S.I.T. Target Pilot Olive

PART 1319771

S.I.T. Target Pilot Nut

PART 1318709

S.I.T. Target Injector - Pilot (0.40NG BSO977141)

PART 1318730

S.I.T. ASO.977.030 D12 Pilot Injectors LP/Gas

PART 1317290

Bonaire Pyrox Vaillant Injector Pilot 0.040mm NG

PART 1317291

Bonaire Pyrox Vaillant Injector Pilot 0.018mm LPG

PART 1317423

Bonaire Pyrox 0.035mm Pilot Injector NG

PART 1319225

Rinnai RC90, 2000 Pilot Injector LPG

page 35

PART 1318881
Rinnai 35mm Pilot Injector NG

PART 1318882

Rinnai Pilot Tube Suit RC90 & 2000 Space Heater

PART 1318880

Rinnai RC90 Pilot Burner LPG & NG

PART 1318593

1/4 x 24 Dormont 304 Flex Tube 1/4 x 18 Dormont 304 Flex Tube (Part 1318594) 1/4 x 48 Dormont 304 Flex Tube (Part 1318595) 1/4 x 36 Flex Tube (Part 1318592)

PART 1320043

J992DKW-7721 Pilot Assembly (Braemer)

PART 1312817

Rheem Domestic Burner Injector LPG 1.55mm

PART 1319106

GC1053 Injector Pilot NG 0.32mm Vulcan

PART 1320054

Inlet/Outlet Olive 10mm Inlet/Outlet Olive 12mm (Part 1320062)

PART 2500405

1BA Brass Gas Injector

PART 2501478

W/R Pilot Assembly (E49)

PART 1319707

Brivis Electrode with Lead 61023/002

PART 2501459

Stellar 0.27mm Pilot Injector NG Aquamax Pilot Injector NG

page 36