All installations and services must be performed by qualified service personnel.

IV. INSTALLATION

A. ROOF JACK

The roof jack assembly and accessories must be listed by a nationally recognized testing agency for the appropriate fuel.

The roof jack assembly must be installed according to the vent manufacturer’s instructions prior to the furnace installation. (Refer to Figure 2 for flue location on furnace.) Adapters for pitched roofs as well as extended barrel length roof jacks are available from other suppliers.

All vent seams and connections must be sealed with high temperature silicone caulk and/or high temperature aluminum tape.

B. STANDARD CHIMNEY

When installed as a central furnace special type for single story dwelling, venting into a metal vent system approved by a nationally recognized testing agency for the appropriate fuel type is permitted. Lined masonry chimneys are acceptable when sized appropriately. The minimum chimney size should equivalent to the inside free area of the 4-inch diameter vent collar exiting the furnace, or 12.5 square inches.

Maximum chimney sizes and acceptable installation practices are referenced in the following publications. In lieu of local codes, when installing the OMC-70 with fuel oil, refer to the latest edition of the installation standard NFPA 31, Installation of Oil Burning Equipment. When installing the GMC-85 with natural or LP gases, refer to Appendix G of the latest edition of the installation standard NFPA 54, National Fuel Gas Code.

C.FURNACE LOCATION

1.For best performance, locate the furnace so that it is centralized with respect to the duct system.

2.This furnace is only intended for installation with free air return through the furnace door louvers. DO NOT connect a ducted return air system directly to the furnace. Improper installation may create a fire hazard and damage internal equipment, as well as void all manufacturer’s warranties.

3.This furnace may be installed on combustible flooring when utilizing either the No. 70 counterflow floor base, for below the floor duct systems, or with the cottage base, for floor level air distribution. See Figures 1 for depictions of the No. 70 and the cottage bases.

4.This furnace is U.L. listed for closet, alcove or freestanding applications. All applications must comply with the requirements of this manual.

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Thermo Products OMC-70, GMC-85 service manual IV. Installation Roof Jack, Standard Chimney, Furnace Location

GMC-85, OMC-70 specifications

Thermo Products has built a reputation for delivering top-notch heating and cooling solutions, and the GMC-85 and OMC-70 models are no exception. These high-efficiency gas furnaces are designed to meet the diverse needs of homeowners while prioritizing energy savings and comfort.

The GMC-85 model is known for its impressive efficiency ratings, operating at an AFUE (Annual Fuel Utilization Efficiency) of up to 85%. This means that a significant portion of the fuel consumed is converted into usable heat, making it an economically sensible option for heating your home. Additionally, it features a multi-speed blower motor, which allows for better air circulation and consistent heating throughout the living space. This model also includes a durable heat exchanger crafted from high-quality materials, ensuring longevity and reliability in performance.

On the other hand, the OMC-70 furnace offers a slightly lower AFUE rating of 70%, but it shines in certain areas such as cost-effectiveness and straightforward installation. Its reputation for reliability is bolstered by its rugged design and construction that can withstand the rigors of various climates. The OMC-70 also includes a standard efficiency motor, contributing to reduced energy consumption while delivering appropriate heating requirements for smaller spaces.

Both models utilize advanced technology aimed at improving user convenience and efficiency. Features such as electronic ignition systems enhance reliability by eliminating the need for a pilot light, while also providing a quick and efficient startup process. Furthermore, each unit can be easily integrated with smart thermostats, allowing homeowners to manage their heating needs remotely for optimized performance.

Noise reduction is another characteristic that sets these models apart. Both the GMC-85 and OMC-70 employ sound-dampening technologies to ensure quieter operation, providing a peaceful environment for families.

In summary, Thermo Products' GMC-85 and OMC-70 furnaces present excellent options for homeowners looking to achieve comfort and energy efficiency. With their durable construction, advanced technology, and features geared toward enhancing user experience, these models provide reliable heating solutions suitable for various needs and budgets. Investing in either of these products translates to improved energy savings and consistent warmth, making them popular choices in today's competitive market.