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

8.The furnace is now ready for burner adjustment, refer to the following “BURNER OPERATION AND ADJUSTMENT” section.

L.BURNER OPERATION AND ADJUSTMENT

: NEVER burn garbage or refuse in the furnace. NEVER try to ignite oil or gas by tossing burning papers or other material into your furnace.

: If you do not follow these instructions exactly, a fire or explosion may result causing personal injury, loss of life or property damage.

: NEVER use gasoline or a mixture of oil and gasoline to start the burner or furnace.

1.Qualified service personnel must perform the first lighting of the burner.

2.The burner instructions must be read and understood before any attempt is made to light this burner.

NOTE: For the sequence of burner operations, see individual burner manual. To successfully service and initially set up this furnace, you must use the following instruments:

[Items (a)-(e) ... apply to both oil and gas furnaces), item (f) ... applies to gas units only, and items (g)-(h) ... applies to oil units only]

a.Carbon dioxide (CO2) or oxygen (O2) analyzer.

b.Flue gas thermometer (range 100°F to 1000°F) and temperature-measuring device (range -40°F to 240°F, for return and supply air temperatures).

c.Carbon monoxide (CO) detector

d.Electrical multimeter

e.Liquid, U-tube type manometer or equivalent pressure measuring instrument (range: 0 – 28 in.W.G.)

f.Smoke spot tester or equivalent smoke density measuring device

g.Oil pressure gauge (range: 0-150 PSIG)

h.Vacuum gauge (range: 0-30 in. W.G. vacuum)

Turn the main service switch that provides power to the furnace to the “off” position. Set thermostat above room temperature, open all fuel supply valves. Bleed air out of fuel supply line, if not already completed (for oil, power must be “on” to the burner and the pump must be operating to expel air in the supply line).

When ignition is established, if necessary, make a preliminary burner air adjustment to attain a clean combustion flame (one which does not create smoke by eye). On the GMC unit, the flame may be viewed through a sightglass mounted on the burner. On both units, the flame may be viewed through the overfire inspection cover (see exploded diagram of

28

Page 28 Page 30
Page 29
Image 29
Thermo Products GMC-85, OMC-70 service manual Burner Operation and Adjustment
Page 28 Page 30

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.
Top Page Image Contents