Bosch WR400-1K Series User Manual

6 720 603 100 (03.05) AL
Instantaneous gas water heater
Models
WR400-1K…
· 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 wa-
ter heaters.
Suitable for heating potable water only. Not approved
for space heating purposes.
NOTICE TO INSTALLER: Please leave this manual with
the owner or affix adjacent to
appliance.
Note: In case of problems please contact your salesman or installer.
- 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
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.
ASTRAVAN DISTRIBUTORS, LTD.
123 Charles Street
North Vancouver, BC. V7H 1S1
Phone Canada: (604) 929-5488
Phone USA: (206) 860-8448
Web Site: www.astravan.com
READ INSTRUCTIONS CAREFULLY BEFORE INSTALLING
WARNING: If the information in this manual is not
followed exactly, a fire or explosion may result
causing property damage, personal injury or death.

Bosch WR400-1K Series Specifications

General

Brand	Bosch
Model	WR400-1K Series
Category	Water Heater
Language	English

Summary

READ INSTRUCTIONS CAREFULLY BEFORE INSTALLING

Notice to Installer

Instruction for installers to leave the manual with the owner or affix it to the appliance.

Installation Warning

Crucial safety warning about fire/explosion risk if manual instructions are not followed.

DIMENSIONS

Physical Dimensions Diagram

Diagram illustrating the physical dimensions of the water heater unit with labeled parts.

Dimensional Specifications

Table detailing the physical dimensions (A-F) of the WR400-1 model in millimeters and inches.

FOREWORD

Compliance, Scope, and Codes

Covers compliance standards, manual scope, gas type compatibility, and required installation codes.

INSTALLATION INSTRUCTIONS

Location and Air Requirements

Proper location, adequate air supply, and specific airflow for confined spaces are crucial for safe operation.

Mounting, Clearances, and Safety Warnings

Secure wall mounting, required clearances, flammable material restrictions, and airflow protection.

Drip Tray, Venting, and Water Connections

Instructions for drip tray installation, venting system connection, and water connection procedures.

Relief Valve and Gas Connections

Proper installation of the relief valve, gas regulator, and safety during pressure testing.

OPERATING INSTRUCTIONS

Pre-Operation Checks and Filling

Checks for damaged unit, filling system with water, and purging air before operation.

Lighting, Shutdown, and Service Hints

Procedures for lighting pilot/burner, safely turning off gas, and servicing the water valve strainer.

Pressure, Temperature, and Limit Switch

Details on gas pressure settings, water flow selector for temperature, and high-limit switch function.

PREVENTIVE MAINTENANCE

Burner and Venting System Maintenance

Annual checks for burner flame characteristics and cleaning of the venting system for optimal performance.

Relief Valve and Lime Deposit Management

Annual testing of the pressure relief valve and periodic removal of lime deposits for longevity.

Space Heating Application Note

Class IV Requirements and Restrictions

Requirements for space heating, potable water compatibility, and restrictions on system connections.

Mixing Valve and Schematic

Mandatory mixing valve installation for scald protection and a representative schematic.