Thermo Products OMC-70, GMC-85 service manual Burner Installation

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

K. BURNER INSTALLATION

The burner mounts to the furnace on three mounting bolt studs, located on the burner mounting plate, in the lower portion of the vestibule, directly in front of the heat exchanger.

The burner insertion depth has been fixed by the factory for the design-specified, combination of the air tube length and the combustion chamber used with the furnace. The combustion chamber is pre-positioned during the assembly process and held in place by the drum and mounting plate. The burner insertion depth is not field-adjustable.

Should access to the chamber be necessary, refer to the exploded diagram, in the back of this manual, to identify replacement parts.

To install and ready the burner for firing, follow the steps below for both furnace models.

1.With electrical power connected to the furnace, turn off all electrical power to unit.

2.Remove the front lower access panel.

3.Mount the burner to the furnace. Install the flange gasket over the mounting studs and secure the burner flange to the furnace using hex head machine screw nuts, provided in the Parts Kit.

4.Connect the burner multipin electrical connector to the multipin connector in the furnace vestibule wiring harness.

For the oil burner installation (OMC) only:

5.Determine whether an oil return line is required and connect the fuel oil piping to the burner oil pump through the base of the unit.

6.Turn on electrical power to the furnace. Cause or simulate a “call for heat” to bleed air from the oil line at the oil pump. (Temporarily, connect the two thermostat leads to cause the oil pump to run.)

7.With all oil shutoff valves open, open the air-bleed valve on the oil pump and capture the oil flow in a container until all traces of air in the line are gone.

8.Close the air-bleed valve. Check for and correct any oil leaks. The furnace is now ready for burner adjustment, refer to the following “BURNER OPERATION AND ADJUSTMENT” section.

For the gas burner installation (GMC) only:

5.Connect the gas piping to the burner through the base of the unit.

6.With all gas shutoff valves open, bleed air from the gas line by opening the pipe union closest to the furnace a small amount. Carefully, close the pipe union when the odor of gas becomes strong. Check for and correct any subsequent gas leaks.

Wait five (5) minutes for any lingering gas to dissipate.

7.Turn on electrical power to the furnace.

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Contents GAS-FIRED or OIL-FIRED Furnace Safety Section Do not RUN the OIL Pump DRY for More than Five MinutesPage Page Page Power Switch Table of Contents Section Beginning Page Models OMC/GMC III. Furnace Specifications Model OMC-70 GMC-85Burner Data Blower DataStandard Chimney IV. Installation Roof JackFurnace Location Page Base Installation Page Page Alcove Installation Closet InstallationCombustion AIR Page Page Fuel Piping Page Page Electrical Wiring AWG Page Wiring Diagram Burner Installation Burner Operation and Adjustment Page Flue GAS Combustion Analysis Burner Combustion ParametersPage OMC/GMC Troubleshooting Flowchart If not, replace 1 TDR. On Module GMC or ignition transformer OMC Yes Does the burner stay Yes CAD Cell Checkout Procedure OMC only Heat Exchanger Cleaning Instructions Cleaning or Replacing Flue Pipes Extended Shutdown On Shut DownVI. User Information Section Component Locations Inspection AreasFilter Location and Cleaning Appendix A. Replacement Parts List

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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