!WARNING

Burn and scald hazard. Safety relief valve could discharge steam or hot water during operation. In- stall discharge piping per these instructions.

1.Boiler is shipped assembled. Install discharge piping from safety relief valve. See Warning, Page 7.

2.Install temperature pressure gauge.

Apply pipe sealant to threads on shaft of gauge.

Thread gauge into supply water tee. See Figure 3.

NOTICE

DO NOT TIGHTEN GAUGE BY HAND!! Gauge should be tightened using crescent wrench or 9/16” open end wrench. See Figure 3.

3.Connect supply and return lines to boiler. Connections may require additional fittings and parts, as shown on diagrams.

Figure 3 - Temperature Pressure Gauge

Verify clean water supply is available to water inlet valve. Install sand strainer when water supply is from a well or pump.

Install hot water boiler above radiation level or as required by Authority having jurisdiction install low water cutoff device at time of installation. Periodic inspection is necessary, as is flushing of float type devices, per manufacturers specific instruction.

FOR USE WITH COOLING UNITS

A. Boiler used in connection with refrigeration system, must be installed so that chilled medium is piped in parallel with heating boiler. Appropriate valves must be used to prevent chilled medium from entering heating boiler. See Figure 5 page 9.

B. Boiler connected to heating coils located in air handling units where they may be exposed to refrigerated air circulation, piping system shall be equipped with flow control valves or other automatic means to prevent gravity circulation of boiler water during cooling cycle.

LOW WATER TEMPERATURE AND LARGE WATER CONTENT SYSTEM (See Figures 6 and 7, Page 10.)

Significant condensation may form in boiler and/or venting system if boiler is operated for long period of time with return temperatures of less than 120° F.

Condensate is corrosive and can cause severe damage to boiler and venting system. Minimum design return water temperature to prevent condensation in boiler and venting is 120°F. Minimum high limit setting is 140°F.

1.Boiler used in heating system where design water temperatures below 140°F are desired (e.g. radiant floor heating), 4-way mixing valve or suitable alternative is required to prevent low temperature return water from entering boiler. Follow mixing valve manufacturer’s instructions.

2.Boiler connected to system having large water content (such as former gravity system), install system bypass. See Figures 6 and 7, page 10.

3.If boiler water reset control is used to operate boiler, minimum reset supply water temperature setpoint must be at least 140°F, unless mixing valve is used as in (1) above.

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Lennox International Inc GWB8-299E-2, GWB8-262E-2, GWB8-280E-2 Temperature Pressure Gauge, For USE with Cooling Units

GWB8-299E-2, GWB8-245E-2, GWB8-280E-2, Gas-Fired Hot Water Boiler, GWB8-262E-2 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.