GENERAL-DIRECT Ignition Models

e.When the call for heat is satisfied the thermo- stat contacts open, the gas valve shuts off gas flow, and the induced draft blower stops.

Read safety information on front page of these installation instructions before operating fur- nace. DO NOT ATTEMPT TO OPERATE

FURNACE IF YOU SMELL GAS.

Operating instructions for

M1M — MODELS WITH DIRECT IGNITION:

a. STOP! Read the SAFETY INFORMATION. b. Set the thermostat to the lowest setting. c. Turn off all electric power to the appliance. d. This appliance is equipped with an ignition

device which automatically lights the burner. Do not try to light the burner by hand.

e.Honeywell - push in the gas control knob and turn clockwise to “OFF.” Robertshaw - push the gas control lever to “OFF.” NOTE: The lever cannot be placed in the “OFF” position unless it is pushed in slightly. DO NOT FORCE (See Figures 30 & 31).

GAS CONTROL KNOB

Figure 30. Direct Ignition

Gas Valve - Honeywell

Gas Control

Figure 31. Direct Ignition

Gas Valve - Robertshaw

f.Wait ten (10) minutes to clear out any gas. If you smell gas, STOP! and follow step “d” in the SAFETY INFORMATION section. If you do not smell gas, go to the next step.

g.Set the On-Off switch to the “ON” position.

h.Honeywell - turn knob on gas control counter clockwise to “ON.” Robertshaw - push the gas control lever to “ON.”

i.Turn on all electric power to the appliance.

j.Replace the furnace door.

k.Set the thermostat to “HEAT” and the desired temperature setting. The furnace should light after approximately 75 seconds. If the appli- ance will not operate, follow the instructions “To Turn Off Gas To Appliance” and call your service technician or gas supplier.

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

TO TURN OFF GAS APPLIANCE:

a. Set the thermostat to the lowest setting.

b. Turn off all electric power to the appliance before servicing unit.

c. Set the ON-OFF switch to “OFF.”

d.Honeywell - push in the gas control knob and turn clockwise to “OFF.” Robertshaw - push the gas control lever to “OFF.”

e.Replace the furnace door.

SEQUENCE OF OPERATION FOR M1M MODELS WITH DIRECT IGNITION

Direct ignition model furnaces do not have a pilot. Ignition is accomplished automatically by a silicon carbide hot surface ignitor. A control module takes care of all timing functions. After lighting, the control module uses the ignitor as a flame sensor, shutting off gas should the flame go out. There are no external relays or timing devices.

Do not try to light this furnace manually. The control module is not field serviceable. a. On a call for heat, the thermostat contacts close, supplying 24 VAC between terminals “C” and “W” of the control module, which

starts combustion motor.

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

c. After a 45 second purge period, the ignitor is energized for a 30 second warm-up period, after which the gas valve opens.

d.The trial period for ignition is approximately 6 seconds, after which the gas valve either

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.

Nordyne M1S GENERAL-DIRECT Ignition Models, Furnace if YOU Smell GAS, Operating instructions for

Models: M1M M1S M1B M1G