Bosch GWH 2400 ES NG User Manual

MODEL GWH 2400 ES NG and GWH 2400 ES LP -
INDOOR MODEL
Temperature Modulated with Electronic Ignition
Suitable for heating potable water only
Not approved for space heating purposes
(Intended for variable flow applications)
GWH 2400 ES NG - Natural Gas
GWH 2400 ES LP - Liquefied Petroleum (LP) Gas
6 720 608 782 US (2008.07) AL
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
vapor and liquids in the vicinity of this or any other
appliance.
Improper installation, adjustment, alteration,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or additional information consult a
qualified installer, service agency or the gas
supplier.
In the Commonwealth of Massachusetts this
product must be installed by a licensed plumber or
gas fitter.
Upon completion of the installation, these
instructions should be handed to the user of the
appliance for future reference.
What to do if you smell gas
• Close gas valve. Open windows.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• If you cannot reach your gas supplier, call the fire
department.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.

Bosch GWH 2400 ES NG Specifications

General

Type	Instantaneous Gas Water Heater
Fuel Type	Natural Gas
Ignition Type	Electronic Ignition
Weight	32 lbs
Energy Factor	0.82
Flow Rate	4.0 L/min
Energy Input	140, 000 BTU/hr
Dimensions	600 x 360 x 190 mm
Maximum Flow Rate	4.0 GPM
Venting	Direct Vent

Summary

1 Warning

2 Appliance details

2.4 General rules to follow for safe operation

Outlines essential safety rules and guidelines that must be followed for the proper operation of the water heater.

3 Installation instructions

3.3 Venting

Details the critical requirements and guidelines for installing the water heater's venting system to ensure safety.

3.4 Combustion air requirements

Explains the necessary provisions for adequate combustion air supply to ensure safe and efficient operation.

3.5 Proper location for installing your heater

3.6 Heater placement and clearances

3.7 Mounting installation

3.8 Gas piping & connections

Details the procedures and safety regulations for connecting the gas supply to the water heater.

3.9 Water connections

Outlines the correct method for connecting the water inlet and outlet pipes, including material recommendations.

3.12 Measuring gas pressure

Explains how to measure and verify the gas pressure for correct appliance operation and safety.

4 Electrical connections

4.1 Electrical power supply

Details the requirements for connecting the water heater to a suitable electrical power source.

5 Operation instructions

5.2 For your safety read before operating your water heater

Presents crucial safety warnings and instructions that must be read before operating the water heater.

5.4 Temperature selection

6 Maintenance and service

6.1 Annual maintenance

6.2 Winterizing for seasonal use

6.3 Mineral scale build-up

6.4 Adjusting CO2 (carbon dioxide)

Details the procedure for adjusting CO2 levels, requiring a certified technician and specific tools.

6.6 Control board diagnostics

6.7 Fan speed adjustment

7 Troubleshooting

7.2 Burner do not ignite when hot water is turned ON

Provides steps to diagnose and resolve issues where the burner fails to ignite when hot water is requested.

7.3 Water is too hot

Offers solutions for problems where the water temperature output is excessively high.

7.4 Water is not hot enough

Provides guidance on troubleshooting and resolving cases where the water temperature is insufficient.

7.5 Low water flow/pressure

Addresses issues related to inadequate water flow or pressure affecting the heater's performance.

7.6 Hot water temperature fluctuates at tap

7.7 Noisy burner/heater during operation

8 Problem solving

8.1 Error code diagnostics

Lists various display error codes, their causes, and the recommended solutions for troubleshooting.

9 Electrical diagram

10 Sensor resistance charts

11 GWH 2400 ES Functional scheme