Maintenance

4 Maintenance

The vent system must be inspected at regular 3-month intervals. Points of inspection are as follows:

1.Screened opening of the vent hood should be free from foreign material and cleaned as necessary.

2.Check all vent system connections for leakage and reseal where needed with high temperature silicone sealant. If any vent pipe component shows signs of deterioration, replace immediately.

3.Inspect for proper closure of the back draft flapper accessory. If the flapper does not properly close, there is a risk of freezing air coming across the heat exchanger which may cause the pipes inside to freeze and burst. This condition is not covered by the water heater warranty. See Fig. 11A for a properly closed back-draft flapper.

4.Conduct safety interlock test and operation of backdraft flapper once a year (Chapter 3.1.3).

Fig. 11A Properly closed backdraft flapper

5 Troubleshooting

5.1 Introduction

Many of the questions customers ask regarding operation of this unit can be answered by following the troubleshooting steps outlined below. Visit our website at www.boschhotwater.com for more detailed troubleshooting. For best results, perform each step before proceeding to the next.

5.2Power vent motor runs all the time or intermittently without water flow

1.The power vent motor is flow switch activated. If the internal paddle inside the flow switch is jammed, it may constantly send a signal to turn on the fan. Shut off water supply to heater and drain. Remove flow switch from water heater piping by removing clips on both ends. Flush water through both ends of flow switch to free up internal paddle and clear debris. After flushing, shake flow switch up and down. The internal paddle should be heard moving freely back and forth.

2.Large amounts of water demand can create pressure drops throughout the plumbing. This may allow for movement of the power vent flow switch and activate the fan. Activated sprinkler systems or flushed toilets are common causes for this symptom. Consult a plumbing professional to correct unintentional water flow through the heater.

3.In buildings with excessively high water pressure, a condition known as “water hammer” may exist. This condition is caused by a combination of high water pressure and the abrupt closing of a faucet valve or internal washer/toilet valve. This instant change in flow results in an instant change in the internal pressures in the pipe, which then sends a shock wave through the pipe. This physical shock will shake, rattle or cause a loud bang in the plumbing which is referred to as “water hammer.” Such a shock wave may cause movement of the power vent flow switch which will activate the fan. Consult a plumbing professional for the use of a pressure reducing valve, expansion tank or water hammer arrestor to combat this condition.

Fig. 11B Improperly closed backdraft flapper

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AQ4 Manual

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AquaStar AQ4 installation manual Maintenance, Troubleshooting
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AQ4 specifications

AquaStar AQ4 is a cutting-edge water filtration system designed to provide clean and safe drinking water for households and businesses. This innovative product stands out in the market with its advanced technology and user-friendly features, making it a top choice for those seeking high-quality water purification.

One of the main features of the AquaStar AQ4 is its multi-stage filtration process. The system employs a series of filters that work together to remove a wide range of contaminants from water. This includes sediment, chlorine, heavy metals, and microorganisms. The first stage is a sediment filter that captures larger particles, while subsequent filters target smaller impurities. This comprehensive approach ensures that the water is not only clear but also free from harmful substances.

The AquaStar AQ4 utilizes activated carbon technology, which is renowned for its effectiveness in removing odors and improving taste. The activated carbon filter absorbs chemicals and volatile organic compounds (VOCs), resulting in crisp and refreshing drinking water. Additionally, the system features a reverse osmosis membrane, which acts as a barrier, allowing only pure water molecules to pass through while blocking contaminants.

Another impressive characteristic of the AquaStar AQ4 is its smart monitoring system. It is equipped with sensors that track filter performance and water quality in real time. Users receive alerts when it is time to replace filters, ensuring optimal performance at all times. This intelligent feature not only simplifies maintenance but also enhances the longevity of the system.

Installation and operation of the AquaStar AQ4 are straightforward, catering to both DIY enthusiasts and those who prefer professional assistance. The compact design allows it to fit seamlessly under most kitchen sinks, saving valuable space. Moreover, the system operates quietly, making it suitable for residential or commercial use without causing disturbances.

In addition, the AquaStar AQ4 is environmentally friendly. By reducing the reliance on bottled water, it contributes to decreasing plastic waste. The system’s durable filters are designed to provide long-lasting performance, reducing the frequency of replacements and promoting sustainability.

In conclusion, the AquaStar AQ4 is a robust water filtration solution that combines advanced technology with user-friendly features. Its multi-stage filtration process, activated carbon technology, smart monitoring system, and environmental benefits make it an excellent choice for anyone seeking quality water purification. With the AquaStar AQ4, users can enjoy peace of mind knowing that they have access to safe and great-tasting water at all times.
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