Bosch Appliances GWH 2400 ES LP manual Mineral scale build-up, Adjusting CO2 carbon dioxide

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Maintenance and service

such as anti-freeze is not permitted as they may cause damage to the water heater's internal components.

1.Press ON/OFF switch on the water heater to turn OFF the heater and unplug power supply cord. The display should be blank.

2.Shut off gas supply to heater.

3.Shut off the water supply to the water heater using installer supplied shutoff valve.

4.Open hot water taps to drain the plumbing system. If water continues to flow after 5 minutes, a plumbing crossover is present and must be corrected before proceeding.

5.Open service valves (if available) or disconnect inlet and outlet water pipes from the water heater. Place a small bucket underneath the water heater to catch residual water remaining inside the water heater.

6.Using an air compressor, blow short bursts of air (100psi max) through the outlet water connection until there is no water present coming through the inlet water connection of the heater.

7.Reconnect water fittings and return heater to service when danger of freezing has past.

6.3Mineral scale build-up

Periodic descaling may be necessary in areas with high mineral content in the water. Scale buildup in the heat exchanger may result in lower flow rates, error codes of A7 and E9 and boiling sounds (knocking and banging) in the heat exchanger.

Descaling using a pump

1.Disconnect electrical supply from the water heater.

2.Shut off the water supply to the water heater using (installer supplied) shutoff valve.

3.Open hot water taps to drain and relieve pressure from the plumbing system.

4.Drain water from the unit's heat exchanger by disconnecting inlet and outlet water connections from the heater.

5.Connect a line (A) from the outlet of the circulating pump (installer supplied) to the inlet water fitting on the water heater (see Fig. 52).

6.Using another line (B), connect to the water outlet fitting on the water heater. Route the other end of this line into a descaling reservoir.

7.Using a 3rd line (C) from the descaling reservoir, connect to the inlet side of circulating pump. Install a filter on the end of this line in the descaling reservoir.

8.Make sure all connections are "water tight.".

9.Fill tank with descaling solution so both lines inside are submersed. We recommend straight white vinegar. If using a commercial descalant, refer to manufacturer's instructions on dilution with water.

10.Operate the circulating pump.

11.Make sure there are no leaks and the solution is flowing from the descaling reservoir through the heater and returning to the reservoir.

12.Run solution through the heater until the solution returning to the descaling reservoir comes out clear. (Changing to a fresh solution may be necessary during this process).

13.Disconnect all lines and drain all solution from heat exchanger. Properly discard of solution.

14.Position a container below the hot water outlet and connect cold water supply. Open cold water supply isolation valve and flush heat exchanger with clean water.

15.Shut cold water shutoff valve and reconnect hot water supply to the water heater.

16.Reconnect electrical supply to unit, open water shutoff valves, and return the unit to service.

Fig. 52

6.4Adjusting CO2 (carbon dioxide)

The CO2 can only be adjusted by a certified gas technician with a calibrated CO2 analyzer.

Caution: One factor that may affect CO2 levels is improper gas pressure. Please see Chapter 3.12 for the procedure to measure gas pressure and record your findings below:

Static Gas Pressure:

 

 

“ WC

 

 

 

 

 

 

 

 

 

P1 Operating Pressure:

 

 

“ WC

 

 

 

 

 

The P1 minimum operating gas pressure is 3.5" WC for Natural Gas and 8" WC for Propane. Do not proceed in

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Contents Intended for variable flow applications What to do if you smell gasIndex For your safety FCCGWH 2400 ES Specifications Technical data FeaturesAppliance details Unpacking the GWH 2400 ES heater General rules to follow for safe operation To remove combustion cover service onlyAppliance details To remove front cover Dimensions and Minimum installation clearances DimensionsInstallation instructions Tools required for installationIntroduction VentingVent Safety System Fittings or Piping Equivalent FeetDescription Minimum distance Installation instructions Venting configuration examples Room sealed installation Twin Pipe System Installation instructions Condensate drain requirementsVenting Flex ProTech Heat Fab Determining installation adjustment ExhaustInstallation instructions Vent connections Combustion air requirements Twin pipeHeater placement and clearances Proper location for installing your heaterMounting installation Gas piping & connections GAS Connections For Natural GAS Water connections Water qualityRecirculation application Recirculation applicationMeasuring gas pressure Electrical connections Electrical power supplyPosition of the fuses in control unit Operation instructions LCD Display functionsPower For your safety read before operating your water heaterTemperature selection Use of optional remote control accessory part no. TSTAT2 Reset buttonOperation Program buttonMaintenance and service Annual maintenance table Every yearAnnual maintenance Winterizing for seasonal useDescaling using a pump Adjusting CO2 carbon dioxideMineral scale build-up Measuring CO2 combustion cover must be installed Adjusting CO2Returning to Service Once Gas Pressure is adequateFinal Readings % 2.8 % 60 ppmProgram values Program Description Factory DefaultComment Control board diagnostics Diagnostic menuFan speed adjustment Total vent length calculationIntake ExampleMaintenance and service To select fan speed Mode Pipe Length1 Fan speedTroubleshooting TroubleshootingWater is too hot Water is not hot enoughLow water flow/pressure Hot water temperature fluctuates at tapNoisy burner/heater during operation Troubleshooting Problem solving Error code diagnosticsProblem solving Display Cause Solution Venting may cause this failureOver-temperature detected by No flame ionization detected with Electrical diagram Electrical diagramSensor resistance charts Back Flow characteristics GWH 2400 ES Functional scheme Functional schemeInterior components diagram and parts list Interior components diagram and parts listInterior components Appliance overview Components diagram GroupDescription Reference Item DescriptionInterior components diagram and parts list Group Interior components diagram and parts list Group Interior components diagram and parts list Group Interior components diagram and parts list Group 708 300 Protecting the environment Protecting the environmentPacking ComponentsLimited Warranty Bosch Thermotechnology Corporation

GWH 2400 ES NG, GWH 2400 ES LP specifications

Bosch Appliances has established a reputation for delivering high-quality and innovative home solutions, and the Bosch GWH 2400 ES LP and GWH 2400 ES NG are no exceptions. These high-efficiency water heaters are designed to provide on-demand hot water, ensuring comfort and convenience for your home.

One of the standout features of the Bosch GWH 2400 ES LP (Liquid Propane) and GWH 2400 ES NG (Natural Gas) models is their compact, space-saving design. These tankless water heaters are engineered to fit in smaller spaces, making them an ideal choice for homes with limited installation areas. Despite their compact size, both models provides a powerful performance that meets the hot water needs for multiple fixtures simultaneously, such as showers, faucets, and washing machines.

These water heaters are equipped with advanced technology that enables precise temperature control. The Bosch GWH 2400 ES series utilizes a microprocessor-based control system that allows for consistent water heating, ensuring the water temperature remains stable even during high demand. The modulating gas valve further optimizes energy consumption, adjusting the flame intensity to meet the exact heating needs, thus enhancing efficiency.

In terms of safety, both the GWH 2400 ES LP and NG come with multiple safety features. These include a flame failure safeguard, overheating protection, and a built-in freeze protection system. Such features ensure both peace of mind and the longevity of the unit.

Installation is straightforward with these models, as they can be vented using standard venting materials, saving time and costs. Additionally, the units boast a low NOx emissions rating, making them environmentally friendly choices that help homeowners reduce their carbon footprint.

Maintenance is minimal, thanks to the corrosion-resistant heat exchanger which ensures durability and long service life under normal operating conditions. This factor, combined with Bosch’s renowned commitment to quality, makes these models a reliable investment for any household.

Whether you opt for the GWH 2400 ES LP or the GWH 2400 ES NG, you will experience the benefits of a powerful, efficient, and safe water heating solution tailored to your specific household needs. Bosch has truly combined technology, sustainability, and user comfort in these innovative models, solidifying their place as leaders in the home appliance market.
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