Bosch WR 400-7.K Series Installation & Operation Manual Download Page 13 | Manualshive

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6 720 606 560

Fig.15 - Diagram of WR 400-7.K..

1. Heat exchanger

2. Pilot assembly
3. Burner manifold gas pressure test nipple
4. Main gas burner
5. Pilot gas tubing
6. Led failure indicator

7. on/off switch

8. Led operation indicator
9. Water valve

10. Temperature adjustment selector

11. Gas inlet gas pressure test nipple

3

1

4

10

11

2

9

8

6

7

5

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Summary of Contents for WR 400-7.K Series

Page 1: ...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 READ INSTRUCTIONS CAREFULLY BEFORE INSTALLING ELECTRONIC IGNITION ...

Page 2: ...atings and are valid only in Canada In the U S the National Fuel Gas Code ANSI Z223 1 1988 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 Figure 1 Size mm Qt natural standart 34 28 kW 1 20 diam 18 propane LP 0 2 000 ft 117 000 Btu hr 0 79 diam 18 natural high 30 85 kW 1 20 diam 18 propane LP 2 000 4 500 ft...

Page 3: ... 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 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 AIR REQUIREMENTS For safe operation sufficient air for combustion ventilation and dilution of f...

Page 4: ...ove or closet with minimum clearances to combustible construction of 0 mm from back 102 mm 4 inches from sides 305 mm 12 inches from top an bottom and 102 mm 4 inches from front A minimum of 305 mm 12 inches shall be allowed for maintenance of serviceable parts Clearance from vent is dependant upon the clearance rating of the venting material used that is type B 1 vent is approved for 1 inch clear...

Page 5: ...lue to the unit The adapter 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 heater at the proper pressure setting for high altitude operation see PRESSURE REGULATION section of this manual table 1 on page 8 WARNING Failure to increase vent size on WR400 7...

Page 6: ...pe is clean on the inside To trap any dirt or foreign material in the gas supply 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 the recommendations of serving gas supplier Joint compounds pipe dope shall be applied sparingly and only to the male threads of pipe joints Do not apply compound...

Page 7: ...n above on this label 2 The gas valve must be shut off by putting the ON OFF switch to position Wait five 5 minutes to clear out any gas If you smell gas STOP Follow B in the safety information above If you do not smell gas go to the next step 3 This water heater is equipped with a safety pilot burner and an automatic ignition control system 4 Set the ON OFF switch to the position In this position...

Page 8: ...s operating at full input Gas pressures read at burner test point D see fig 7 a will usually read 1 1 5 W C less than below Table 1 Appliance Regulator Pressure Setting 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 1 1988 recommends for high altitude installations a...

Page 9: ... electrode Pilot screen PILOT ORIFICE To clean the pilot burner and or the pilot orifice Turn off the gas to the unit Set the ON OFF switch to OFF position Remove the cover on the heater To do so pull of the temperature adjustment knob and unscrew and remove the plastic collar Pull main cover out toward you and lift up and out The pilot orifice should be cleaned or replaced Do not enlarge orifice ...

Page 10: ...mponent with new one and refit using the reverse of the procedure set out the table above Function check Flue gas safety device function check Disconnect flue pipe Replace with pipe about 50 cm long with sealed end Fit pipe vertically Start up appliance at rated output and set temperature control to maximum temperature Under those conditions the appliance should shut down after two minutes Remove ...

Page 11: ... valve at inlet and mix with cold water WATER IS NOT HOT ENOUGH 1 Temperature selection too low Change the setting Turn the temperature adjustment knob clockwise to the right Note This will decrease the activation flow rate 2 Water flow through the heater is higher than the capacity of the Bosch to heat it This can be due to too high water inlet pressure 60 psi max for best results or due to acid ...

Page 12: ...ure may be overpowered by a much higher cold water pressure which may cause the Bosch burners to shut down Make sure faucet aerators or shower heads are free of minerals Do not add any flow restrictor to the shower head 2 Cold water is mixing with the hot water between the Bosch and the outlet See 4 under NO SPARK AT THE PILOT 3 Inlet water pressure is erratic due to inadequate supply water pressu...

Page 13: ...lot assembly 3 Burner manifold gas pressure test nipple 4 Main gas burner 5 Pilot gas tubing 6 Led failure indicator 7 on off switch 8 Led operation indicator 9 Water valve 10 Temperature adjustment selector 11 Gas inlet gas pressure test nipple 3 1 4 10 11 2 9 8 6 7 5 ...

Page 14: ...14 6 720 606 560 Fig 16 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST ...

Page 15: ...lve NG 8 707 011 917 15 Gas valve LPG 8 707 011 945 16 Diaphragm switch NG 8 708 504 021 16 Diaphragm switch LPG 8 708 504 049 17 Pilot electrovalve 8 708 501 249 18 Burner electrovalve 8 708 501 250 19 Cold water pipe 8 700 705 972 20 Hydro generator 8 707 406 043 21 Connecting pipe 8 700 705 947 22 Hot water pipe 8 700 715 080 23 Temperature limit 8 707 206 040 24 Water valve 8 707 006 353 25 Co...

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