HONEYWELL SV9541M

IPOWERAPPLIEDTO APPLIANCE

+

I THERMOSTATCALLS FORHEAT

¢

IPRESSURE SWITCHES PROVED OPEN?

ICOMBUSTIONBLOWER ENERGIZED

PRESSURESWITCHESCLOSEDWITHIN30 SEC- ONDS?

+

I3SECONDPRE-PURGE

PILOTVALVEOPENS: IGNITORPOWERED(1)

PILOTLIGHTSAND FLAME ISSENSED DURING 90SECOND TRAILFOR IGNITION?

I YES

MAIN VALVEOPENS,

HEATINGFAN "ON" DELAYBEGINS

+

I AFTERDELAY:CIRCULATINGBLOWERSTARTS

FLAME SENSE LOST?

"SMART VALVE" Sequence of Operation

I

WAIT FORPRESSURESWITCHESTO OPEN

_._

COMBUSTIONBLOWER DE-ENERGIZED

J__

FIVEMINUTE WAIT PERIOD

I

FAILURETHREESECONDFLAMERECYCLEDELAY,J_

l'_Vl PILOTVALVECLOSES;

 

PILOT IGNITOROFF

r

I

YES

 

 

 

CIRCULATINGBLOWEROFF AFTER DELAY

I

I

 

+

 

 

 

PILOTAND MAIN VALVECLOSE

1

 

THERMOSTATCALL FORHEAT ENDS

L FLAMETIMES INSENSETHISCALLLOSTFORHEAT?MORETHAN FIVE

COMBUSTIONAIR BLOWER OFF AFTERPOST

PURGE

NO

PILOTAND MAIN VALVECLOSE

+

COMBUSTIONBLOWER DE- ENERGIZEDAFTER 30

SECONDPOST PURGE

+

I CIRCULATINGBLOWEROFF AFTER DELAY

I

IWAIT FOR NEXTCALL FOR HEAT

I

NO

YES

(1) Ignitor "ON" for first 30 seconds of trial for ignition, then "OFF" for next 30 seconds. If the pilot has not lit, it turns back "ON" for the final 30 seconds. The pilot valve remains energized during the entire 90 second trial for ignition.

NOTE: If main limit string opens and takes longer than 2 minutes to close, system goes into I hour wait

period.

I

[_

44001 111400

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Sears N9MP2, N9MP1, 9MPD manual Honeywell SV9541M

9MPD, N9MP1, N9MP2 specifications

The Sears N9MP2, N9MP1, and 9MPD are prominent models in the realm of residential heating systems, specifically designed to provide efficient and effective heating solutions. These models are part of Sears' commitment to quality and innovation, making them a popular choice among homeowners seeking reliability and performance.

The N9MP2 is a high-efficiency multi-speed gas furnace that boasts an impressive AFUE (Annual Fuel Utilization Efficiency) rating. This feature allows the furnace to convert a significant portion of fuel into usable heat, which effectively translates to lower energy bills for homeowners. The unit is equipped with a two-stage gas valve that provides increased comfort by adjusting the heating output based on demand, ensuring an even temperature throughout the home.

The N9MP1, like its counterpart, is known for its reliability and efficiency. It offers a single-stage operation that is ideal for homes needing consistent heating without the necessity for the more complex stages present in two-stage systems. This model also has a good AFUE rating, making it a cost-effective solution for families looking to reduce their heating expenses. Its design is tailored for easy installation and maintenance, allowing homeowners to keep their heating systems running at optimal performance without hassle.

The 9MPD model takes a step further with its advanced technology integration. It features a sophisticated control board that allows for easier diagnostics and enhanced system management. The 9MPD is also designed with quiet operation in mind, employing advanced sound-reduction technologies to minimize noise levels during heating cycles. Homeowners will appreciate the peace and quiet it brings, particularly in shared living spaces.

All three models are equipped with high-quality insulation and specialized heat exchangers that enhance their thermal efficiency. Additionally, they are designed with safety features such as automatic shut-off systems and robust flame rollout protection, ensuring a safe heating experience.

In terms of characteristics, these models are generally constructed with durable materials, designed to endure harsh weather conditions while providing consistent heating. They can be connected to various home automation systems, which adds to their appeal for tech-savvy consumers.

In conclusion, the Sears N9MP2, N9MP1, and 9MPD represent a comprehensive lineup of reliable, efficient, and technologically advanced heating systems suitable for contemporary homes. Their dedication to performance ensures that homeowners enjoy a warm and energy-efficient environment throughout the chilly seasons.