If the unconfined space is within a building of tight construction (building using the following construction: weather stripping, heavy insulation, caulking, vapor barrier, etc.), air for combustion and ventilation must be obtained from outdoors. The installation instructions for confined spaces must be followed.

CONFINED SPACE

When drawing combustion air from inside a conventionally constructed building to a confined space, such a space shall be provided with two permanent openings. ONE WITHIN 12 INCHES OF THE ENCLOSURE TOP AND ONE WITHIN 12 INCHES OF THE ENCLOSURE BOTTOM. Each opening shall have a free area of one square inch per 1000 Btu/hr of the total input of all appliances in the enclosure, but not less than 100 square inches.

If the confined space is within a building of tight construction, air for combustion and ventilation must be obtained from outdoors. When directly communicating with the outdoors or communicating through vertical ducts, two permanent openings, located in the above manner, shall be provided. Each opening shall have a free area of not less than one square inch per 4000 Btu/hr of the total input of all appliances in the enclosure. If horizontal ducts are used, each opening shall have a free area of not less than one square inch per 2000 Btu/hr of the total input of all appliances in the enclosure.

WATER CONNECTIONS

Refer to figure 1 for typical installation. A suitable pipe thread sealant must be used to prevent leakage. Please note that the side connection plugs are not factory installed. Plugs are supplied in a kit with the water heater.

WATER (POTABLE) HEATING AND SPACE HEATING

1.All piping components connected to this unit for space heating applications shall be suitable for use with potable water.

2.Toxic chemicals, such as those used for boiler treatment, shall NEVER be introduced into this system.

3.This unit may NEVER be connected to any existing heating system or component(s) previously used with a non-potable water heating appliance.

4.When the system requires water for space heating at temperatures higher than required for domestic water purposes, a tempering valve must be installed. Please refer to Fig. 2 for suggested piping arrangement.

FIGURE 2

CLOSED WATER SYSTEM

A closed system will exist if a back-flow preventer (check valve), pressure reducing valve, or other similar device is installed in the cold water line between the water heater and the street main (or well). Excessive pressure may develop due to the thermal expansion of heated water causing premature tank failure or intermittent relief valve operation. This type of failure is not covered by the limited warranty. An expansion tank may be necessary in the cold water supply to alleviate this situation, see Fig. 1. Contact the local plumbing authority.

If the temperature and pressure relief valve on the appliance discharges periodically, this may be due to thermal expansion in a closed water supply system. Contact the water supplier or local plumbing inspector on how to correct situation. DO NOT PLUG THE TEMPERATURE AND PRESSURE RELIEF VALVE.

GAS CONNECTIONS

The minimum gas supply pressure for input adjustment is 5.0" W.C. for natural gas.

THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER THAN 14" WATER COLUMN SUPPLY PRESSURE. EXPOSURE TO HIGHER GAS SUPPLY PRESSURE MAY CAUSE DAMAGE TO THE CONTROL WHICH COULD RESULT IN FIRE OR EXPLOSION. If overpressure has occurred such as through improper testing of gas lines or emergency malfunction of the supply system, the control must be checked for safe operation. Make sure that the outside vents on the supply regulators and the safety vent valves are protected against blockage. These are parts of the gas supply system not the heater. Vent blockage may occur during ice storms.

IT IS IMPORTANT TO GUARD AGAINST CONTROL FOULING FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION.

All gas piping must comply with local codes and ordinances or with the National Fuel Gas Code (ANSI Z223.1 / NFPA-54) whichever applies.

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A.O. Smith BTX-80 warranty Confined Space, Water Connections, Water Potable Heating and Space Heating, Closed Water System
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BTX-80 specifications

The A.O. Smith BTX-80 is a high-efficiency water heater designed to meet the needs of both residential and light commercial applications. Engineered with the latest technology, this unit promises reliability and superior performance, making it a standout choice for those seeking an efficient hot water solution.

One of the primary features of the BTX-80 is its energy efficiency. With a high Energy Factor (EF) rating, this water heater is designed to minimize energy consumption while delivering reliable hot water. This feature not only helps owners save on utility bills but also contributes to a more sustainable living environment.

The BTX-80 utilizes advanced condensing technology, allowing it to extract heat from exhaust gases that would typically be expelled. This process enhances its efficiency and reduces the amount of fuel needed to heat water, ensuring that users benefit from lower operating costs. The unit comes equipped with a built-in power vent system, which allows for flexible installation options and an easy, straightforward setup.

Another notable characteristic of the A.O. Smith BTX-80 is its robust build quality. Designed with durable materials, it features a glass-lined tank that helps prevent rust and corrosion, extending the lifespan of the unit. The BTX-80 is also equipped with advanced insulation, which ensures minimal heat loss and improved energy retention.

Safety features are paramount when it comes to water heating, and the BTX-80 does not disappoint. It includes a fully integrated safety system that protects against overheating and excessive pressure, ensuring peace of mind for homeowners and business operators alike.

Additionally, the BTX-80 has a user-friendly digital display and diagnostic control system, allowing users to easily monitor and adjust settings. It also features multiple installation configurations to adapt to various space requirements.

In summary, the A.O. Smith BTX-80 water heater combines high energy efficiency, advanced condensing technology, robust construction, and user-friendly features. Ideal for those seeking a reliable and sustainable hot water solution, this model is a testament to A.O. Smith's commitment to innovation and quality in the water heating industry.
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