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Bosch WR 400-7.K Series Installation & Operation Manual

Bosch wr 400-7.k.. instantaneous gas water heater
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ELECTRONIC IGNITION

Model
WR 400-7.K..
• 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.
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: (604) 929-5488
Phone USA:
Web Site: www.astravan.com
Note: In case of problems please contact your salesman or installer
Instantaneous gas water heater
(206) 860-8448
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 flamma-
ble 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.

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  Summary of Contents for Bosch WR 400-7.K Series

  • Page 1: Electronic Ignition

    • 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.
  • Page 2 DIMENSIONS Figure 1 Maximum hydrostatic water pressure - 1.03 MPa (150 p.s.i.) Maximum recommended 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. gals./min.). Main Burner Orifices Model Type of Gas Altitude Input Size, mm...
  • Page 3: Installation Instructions

    FORWARD The design of the WR400-7.K.. complies with CAN 1-4.3 The BOSCH instantaneous gas water heater is designed to and ANSI Z21. 1 0 (latest edition) as an instantaneous gas operate on natural or propane gas; however, make sure that water heater.
  • Page 4 MOUNTING For either a confined or unconfined space in a building of tight construction with inadequate infiltration, air must be The WR400-7.K.. is designed certified for mounting to a wall. drawn from the outdoors or from spaces that freely The heater must not be installed on a carpeted wall. The communicate with the outdoors.
  • Page 5: Water Connections

    5 below. Figure 3 VENTING The BOSCH instantaneous water heaters have built- in 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 lager, refer to: in Canada, CAN/CGA –...
  • Page 6: Relief Valve

    The water heater, including the pressure regulator provided with it, must not be operated at gas supply pressures in BOSCH water heaters are shipped from the factory with excess of 3,45 KPa (½ psig). If overpressure has occurred the gas pressure regulators preset for the gas shown on the...
  • Page 7: To Turn Off Gas To Appliance

    OPERATING INSTRUCTIONS WARNING! LIGHTING AND OPERATING INSTRUCTIONS STOP! Read the safety information above on this label. If the water heater has been damaged or exposed to fire or 2. The gas valve must be shut off by putting the ON/OFF sooting, or if any part has been underwater, do not use.
  • Page 8: Pressure Regulation

    The BOSCH WR400-7.K.. is equipped with a modulating in the U.S.A., is factory preset to deliver gas at the gas valve which adjusts the flow of gas to the main burner in standard altitude setting listed on the rating plate and proportion to the water flow rate.
  • Page 9: Maintenance And Service

    MAINTENANCE AND SERVICE gas orifices are large enough that you can usually clean them Approximately once a year, the Bosch should be checked, by blowing through them. LP orifices, on the other hand, are cleaned and serviced as necessary. To remove the front cover, too small to clean and should be replacement.
  • Page 10: Troubleshooting

    To confirm there is no cross-over in the plumbing, shut off If faults occur on the flue gas safety device, proceed as the cold water supply to the Bosch water heater and open a follows: hot water faucet. There should not be any water flowing at that faucet.
  • Page 11: Pilot Lights But Burners Will Not Come On

    Compare water temperature at outlet of the Bosch (hold the flow restrictor to the shower head. Bosch’s outlet pipe with your hand) and at the tap. If these two are very different, check for mixing valve or plumbing 3. ECO (overheat sensor) tripped due to overheating crossover (see “NO SPARK AT THE PILOT”...
  • Page 12 HOT WATER TEMPERATURE FLUCTUATES 1. Unbalanced pressure in waterlines. The added restriction caused by the Bosch in the hot water system can result in uneven pressures between the cold and the hot. In such cases when mixing cold water at the tap, the...
  • Page 13 Fig.15 - Diagram of WR 400-7.K.. 1. Heat exchanger 7. on/off switch 2. Pilot assembly 8. Led operation indicator 3. Burner manifold gas pressure test nipple 9. Water valve 4. Main gas burner 10. Temperature adjustment selector 5. Pilot gas tubing 11.
  • Page 14 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST Fig. 16 6 720 606 560...
  • Page 15 Fig. 16 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST WR400-7K... Front cover ¤ 8 705 421 742 Temperature adjustment knob comp. ¤ 8 702 000 219 Temperature adjustment knob ¤ 8 702 000 111 Draught diverter ¤ 8 705 505 354 Heat exchanger ¤...