!WARNING:

Close hinged fire door. If fire door is open or spring is broken it may allow products of combustion into the living space by the furnace blower resulting in possible asphyxiation.

In the event of any flashback or explosion, immediately shut off the furnace and call your service technician.

TO TURN OFF GAS TO APPLIANCE: a. Set the thermostat to the lowest setting.

b. Turn off all electric power to the appliance at breaker or fuse box, before servicing.

c. Remove the furnace door.

d. Push in the gas control lever slightly and move to the left to “OFF.” DO NOT FORCE.

e. Replace the furnace door.

SEQUENCE OF OPERATION FOR STAND- ING PILOT

aOn a call for heat, the thermostat contacts close, supplying 24 VAC to the gas valve.

b. When the gas valve is energized it steps open at a reduced flow and opens fully after approximately 14 seconds.

c.When the call for heat is satisfied the thermo- stat contacts open, the gas valve shuts off gas flow.

SEQUENCE OF OPERATION FOR STAND- ING PILOT W/INDUCED DRAFT BLOWERS MODELS

a. On a call for heat, the thermostat contacts close, supplying 24 VAC to the relay.

b. The relay contacts close and energize the induced draft motor.

c. When the inducer starts, the air pressure switch closes at -0.20”WC differential pres- sure and energizes the gas valve.

d. When the gas valve is energized it steps open at a reduced flow and opens fully after approximately 14 seconds.

Gas Control Lever

Pilot Adjustment

Figure 28. Standing Pilot Valve

Pilot

Bracket

Figure 29. Lighting Furnace

21

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Nordyne M1B, M1G, M1S, M1M owner manual Sequence of Operation for STAND- ING Pilot, Standing Pilot Valve
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M1M, M1S, M1B, M1G specifications

Nordyne, a renowned player in the HVAC industry, has introduced a range of high-efficiency gas furnaces, including the M1S, M1G, M1B, and M1M models. Each of these furnaces is designed to provide efficient heating solutions tailored to the needs of homeowners.

The M1S series is well-known for its reliability and performance. It features a single-stage heating process that delivers consistent warmth to any space. With its multi-speed blower, the M1S ensures quiet and comfortable airflow, adapting seamlessly to varying temperature demands. Its robust construction coupled with an energy-efficient design makes it an ideal choice for those looking for dependable heating without sky-high utility bills.

The M1G model steps it up with a two-stage heating system that offers enhanced comfort and efficiency. By operating at a lower speed during milder conditions, the M1G can effectively reduce energy consumption while still maintaining a cozy environment. It is equipped with a variable-speed blower that not only enhances efficiency but also minimizes noise, making it perfect for residential areas. The M1G is designed with advanced safety features, including an integrated control board that monitors furnace functions to ensure optimal performance.

For those seeking a budget-friendly option without compromising on quality, the M1B model provides a solid performance with its straightforward, reliable single-stage heating. While it may lack some of the advanced features found in higher-end models, the M1B is built for ease of use with straightforward controls and maintenance, making it a great option for families.

The M1M model integrates cutting-edge technology with a focus on maximum efficiency. Featuring a modulating gas valve, this model can adjust its output based on real-time heating requirements. This adaptability ensures that the furnace operates at peak efficiency, significantly lowering energy bills and improving overall comfort. The M1M also boasts advanced diagnostic capabilities that allow for easy troubleshooting, thus reducing maintenance time and costs.

In summary, Nordyne's M1 series furnaces—M1S, M1G, M1B, and M1M—offer a range of options to meet diverse heating needs. With technologies designed for efficiency, reliability, and comfort, Nordyne continues to solidify its reputation as a leader in the HVAC market, providing homeowners with effective heating solutions tailored to their lifestyles and budgets.
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