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

Check all flue pipes for restrictions due to soot, or carbon build-up, as well as foreign matter, or any materials, that cause the venting system to restrict the proper venting of combustion products. If a restriction is found, the flue pipe must be cleaned or replaced to ensure proper venting.

Flue pipes should also be inspected for any signs of corrosion, deterioration or leakage that may cause combustion by-products to infiltrate the home or indoor environment.

If signs of corrosion, deterioration or leakage are evident, the flue pipe must be replaced with a properly sized, agency-approved, flue pipe.

E. EXTENDED SHUTDOWN

If this furnace is shut down or off for an extended period of time, several steps can be taken to help insure a smooth and reliable start.

ON SHUT DOWN:

1.Close the fuel supply shutoff valve(s).

2.Turn the furnace power switch “off” and disconnect electrical power to the unit.

3.Fill the oil tank to prevent condensation (oil units only).

4.If shutdown exceeds one season, an oil stabilizer should be added to the oil tank as recommended by your oil supplier (oil units only).

ON START-UP:

1.Have the heating system (and furnace) inspected and started by a qualified service person.

2.Check for a clean, adequate supply of fuel.

3.Set the room thermostat above room temperature.

4.Open all shutoff valves in the fuel supply line.

5.Turn “on” the main power at the disconnecting switch and at the furnace power switch to start the burner. If the burner does not start, immediately reset the burner primary (ignition) control module. On oil furnaces, if required, vent the fuel of air as soon as the burner motor starts. If the burner stops during venting, wait three to five minutes before attempting to restart.

: Do not attempt to start burner when excess fuel has accumulated inside the furnace.

6. Follow the “BURNER OPERATION AND ADJUSTMENT” procedure in Section L.

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Thermo Products GMC-85, OMC-70 service manual Extended Shutdown, On Shut Down
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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.
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