Inspect/Prepare Installation Site

Inspect Chimney or Direct Vent System

!WARNING Fire, Smoke & Asphyxia-

tion Hazard

yCarefully inspect the chimney or exhaust vent system.

yMake sure it is properly sized and in good work- ing condition.

yFollow the instructions supplied by the appliance manufacturer.

yThe installation must strictly comply with all ap- plicable codes, authorities having jurisdiction and the latest revision of the National Fire Protection Association Standard NFPA 31 for the installa- tion of chimneys and vent sizing, (or CSA-B139 and CSA-B140 in Canada).

yRegulation by these authorities take precedence over the general instructions provided in this in- stallation manual.

1.Starting with minimum gph firing rate, the mini- mum size recommended is 6” flue pipe with 8” X 8” inside chimney, unless specified otherwise by the appliance manufacturer.

2.A chimney flue shall extend at least 3 feet above the highest point at which the chimney comes in contact with the roof, and not less than 2 feet above the highest roof surface or structure within 10 feet horizontally of the chimney. Refer to Fig- ure 2.

3.Any accumulation of soot or debris in chimney offsets should be removed

4.Any obstructions such as a protruding joint or a piece of broken tile wedged in the chimney should be removed.

5.No other appliance connection should be made to the same flue pipe.

6.The flue pipe should have an upward pitch toward the chimney of at least 1/4” per foot of length. It should fit tightly and should not project into the chimney.

7.Any leakage between tiles, around clean-out doors, or around the vent pipe should be sealed.

INSULATED STAINLESS STEEL CHIMNEY LINERS

The new designs of high efficiency oil furnaces and boilers in conjunction with flame retention oil burners are more efficient. One result of increased efficiency is lower flue gas temperatures. As

flue gases rise in the chimney, they will cool and condense when they reach the dew point. The condensation will mix with the sulphur in the flue gases creating sulphuric acid. The acid will attack the chimney mortar, brick and clay liners caus- ing corrosion, deterioration and blockage of the chimney. Eventually the blockage could prevent exhausting the flue gases. Instead, the flue gases could vent out the barometric damper into the liv- ing space.

Therefore, it is strongly recommended that an ap- proved insulated stainless steel liner be installed.

yFor those installations not requiring a chimney, such as through-the-wall vented appliances, fol- low the instructions given by the appliance and power venter (if used) manufacturers.

Figure 2 – Chimney Design - Above the Roof

NOTE: Correct chimney design is shown by dotted lines. Incorrect chimney design, as shown by the solid lines, may result in down- drafts.

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6104BAFG R06

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Weil-McLain UO-4 CV, UO-5 CV, UO-3 CV Inspect/Prepare Installation Site, Inspect Chimney or Direct Vent System Tion Hazard
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UO-3 CV, UO-4 CV, UO-5 CV specifications

Weil-McLain is a well-respected name in the heating industry, recognized for its high-quality and efficient boiler systems. Among its notable offerings are the UO-3 CV, UO-4 CV, and UO-5 CV models, all of which showcase advanced engineering and innovative technology tailored for residential and commercial applications.

The UO-3 CV boiler is designed for mid-sized heating requirements, boasting a strong output capacity that balances efficiency with performance. It features a compact size, suitable for smaller installations, without sacrificing power. The boiler is equipped with a durable cast iron heat exchanger that provides excellent thermal efficiency and longevity, ensuring reliable operation over the years. Its easy access for maintenance also makes it a popular choice among HVAC professionals.

Moving to the UO-4 CV model, this boiler builds on the success of the UO-3 with an increased output capacity, making it ideal for larger residential or light commercial spaces. The UO-4 CV incorporates Weil-McLain’s advanced combustion technology, which optimizes fuel use and significantly reduces emissions. This model maintains a compact design while enhancing overall performance through improved heat transfer and reduced standby losses. The UO-4 CV's user-friendly features, including easy-to-use controls and a diagnostic system, streamline operational efficiency.

The UO-5 CV further solidifies Weil-McLain's commitment to excellence with its highest output among the three. This boiler is particularly suited for extensive heating demands, making it popular among larger commercial installations. The UO-5 CV also employs cutting-edge technology, including advanced controls for precise temperature regulation and an efficient system designed to minimize energy consumption. Its robust construction ensures it can handle heavy use while remaining reliable, even in challenging environments.

In summary, the Weil-McLain UO series, including the UO-3 CV, UO-4 CV, and UO-5 CV, represents a perfect blend of efficiency, innovation, and reliability. All models utilize durable materials, advanced engineering, and state-of-the-art technologies that define Weil-McLain's reputation for quality in hydronic heating solutions. Whether for residential or commercial applications, these boilers serve as dependable sources of heat, catering to various needs while maintaining energy efficiency and lower emissions.
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