System and Operating Precautions

Applies to ALL Aluminum High Efficiency Gas-Fired Water Boilers

Clean System First

BEFORE connecting boiler to heating system, clean and

flush system thoroughly. Verify system is free of sediment, flux and any residual boiler water additives.

Systems having antifreeze not recommended must be completely flushed to ensure no old antifreeze remains. In older systems obviously discolored, murky or dirty water; or pH reading outside acceptable range (between

7.0and 8.0) are indications the system should be cleaned or treated. Thoroughly flush system with clean water to remove any sediment or contaminants. Sludge and iron oxide deposits can cause rapid breakdown of inhibitors.

Flushing with clean water. If chemical cleaners are used, use only those recommended for use with aluminum boilers. Follow chemical cleaner manufacturer’s instructions completely.

DO NOT mix different manufacturer’s products.

Fill Water and Chemistry

Verify water used to fill system meets these requirements: System fluid pH maintained between 7.0 and 8.0. Maintain water hardness below 7 grains hardness.

Filling with chlorinated potable water is acceptable. DO NOT fill boiler with water containing chlorine in excess of 100 ppm.

DO NOT use inhibitors or other additives that are not listed in this addendum.

Consult local water treatment specialist for recommendations if any of above requirements is outside stated ranges.

Eliminate System Leaks

Continuous addition of make-up water will constantly add oxygen to system. Eliminate all system leaks. All system leaks must be repaired immediately.

DO NOT use stop leak compounds. Leaks in threaded connections in aluminum boiler sections must be repaired immediately. Aluminum threads will not seal themselves.

Verify expansion tank is operational and properly sized. Undersized expansion tanks cause relief valve weeping and substantial make-up water addition.

Operation of this boiler in system containing significant amounts of dissolved oxygen can cause severe heat exchanger corrosion damage.

This boiler is not designed for use in systems containing regular additions of make-up water. Regular additions of make-up water may cause severe heat exchanger damage. System leaks may not always be visible. An unseen system leak will become obvious if boiler pressure decreases when make-up valve is closed.

This boiler is designed for closed loop hydronic heat system ONLY! This boiler is not suitable for natural gravity type installations, or any other open type system.

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Lennox International Inc Gas-Fired Hot Water Boiler Clean System First, Fill Water and Chemistry, Eliminate System Leaks
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GWB9-050IH-2, GWB9-100IH-2, GWB9-075IH-2, Gas-Fired Hot Water Boiler specifications

Lennox International Inc. is a prominent player in the HVAC industry, renowned for its innovative solutions and high-efficiency products. Among its standout offerings is the GWB8 Gas-Fired Hot Water Boiler, available in various models including GWB8-262E-2, GWB8-245E-2, GWB8-280E-2, and GWB8-299E-2. These units are designed to provide reliable and efficient heating solutions for residential applications.

One of the key features of the GWB8 series is its energy-efficient operation. These boilers are designed to achieve an AFUE (Annual Fuel Utilization Efficiency) rating of up to 84%, allowing homeowners to save on energy costs while reducing their environmental footprint. The product utilizes a cast-iron heat exchanger, which promotes optimal heat retention and distribution, ensuring consistent performance throughout the heating season.

The GWB8 series incorporates advanced technologies to enhance comfort and efficiency. A significant innovation is the use of a power venter system that facilitates venting through the sidewall of the home, providing installation flexibility while maintaining safety standards. Additionally, the boilers are equipped with a Honeywell integrated control for precise temperature management and modulating gas valve technology, which adjusts the gas flow to match the heating demand, further optimizing fuel consumption.

Another defining characteristic of the GWB8 models is their durable construction. Designed to withstand the rigors of heating applications, these models feature a robust, powder-painted steel cabinet that helps prevent rusting and corrosion. The access doors are insulated, contributing to overall efficiency while allowing easy maintenance and serviceability.

The GWB8 series is also designed with homeowner comfort in mind. The quiet operation of these boilers ensures that they blend into the living environment without disruptive noise, making them an ideal choice for residential settings. The models are compatible with various heating systems, including hydronic heating, making them versatile and reliable.

Overall, Lennox's GWB8 Gas-Fired Hot Water Boiler series is an excellent choice for homeowners seeking efficient, durable, and reliable heating solutions. With a combination of advanced technologies, energy-efficient performance, and practical features, these boilers set a high standard for residential heating systems in today's market.
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