REDUCED FURNACELIFE HAZARD

Failure to follow caution instructions may result in reduced furnace life.

Do NOT exceed 115V/0.8 amp. maximum current

load for both the EAC terminal and the HUM terminal combined.

NOTE: The humidifier will be powered when the furnace is fired and the circulating air blower comes on. The electronic air cleaner will be powered anytime the air circulating blower is energized.

However, the electronic air cleaner is NOT energized during con- tinuous fan operation controlled by the electronic fan control.

Fan Control

The fan control is preset at the factory with a fixed blower ON delay of 30 seconds in the heating mode. The blower OFF timing is pre- set at 140 seconds. If desired, the fan OFF delay can be reset to

obtain the longest delay times while still maintaining comfort lev- els. See "Furnace Wiring Diagram".

Fan Delay DIP Switch Settings

COOL ON DELAY: 5 SEC,

COOL OFF DELAY: 90 SEC.

HEAT ON DELAY: 30 SEC.

HEAT OFF DELAY

12

12

12

12

60SEC 100 SEC 140SE0 180SE0 25-23-47

Electrical

Connections

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mountedtoeithertheleftorright i/"

FF

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side

 

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w

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switches

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NOTE 115

VAC/6OHz/single-phase

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Operating voltage

range*: 127

max, 104

rain.

25-23-42

Permissible

limits

of voltage

at which

unit will operate

satisfactorily

Control Center Fuse

The 24V circuit contains a 5-amp, automotive-type fuse located on fan timer board. (See Figure 33) Any electrical shorts of 24V wiring during installation, service, or maintenance may cause fuse to blow. If fuse replacement is required, use only a fuse of identical size (5 amp.)

Fan Timer Connections

FUSE/'_r

25-23-41

[_

440 01 1020 04

Page 34
Image 34
Sears 9MPD050F12B1, N9MP2050B12B1 Reduced Furnacelife Hazard, Fan Delay DIP Switch Settings, Fan Timer Connections, FUSE/r

9MPD100J20B1, N9MP2100J20B1, 9MPD050F12B1, N9MP1100J20B1, N9MP1125J20B1 specifications

The Sears N9MP1075B12B1, N9MPD125L20B1, N9MP1050B12B1, N9MPD080J16B1, and N9MP2125J20B1 are part of the trusted line of gas furnaces manufactured by Sears, specifically designed to deliver reliable heating solutions for residential applications. These models incorporate cutting-edge technology and robust engineering, making them popular choices among homeowners looking for efficiency and comfort.

One of the main features of these models is their high-efficiency operation. With Annual Fuel Utilization Efficiency (AFUE) ratings exceeding 90%, these furnaces convert a significant portion of fuel into usable heat, thereby reducing energy costs. The N9MP series employs a multi-speed blower system that optimizes airflow for enhanced comfort while minimizing noise levels, ensuring a pleasant indoor environment.

The N9MPD125L20B1 and N9MPD080J16B1 variants highlight their adaptability through dual-stage heating capabilities. This technology allows the furnace to adjust its output based on the thermal demands of the home, preventing energy wastage during milder conditions while providing robust heating during extreme cold spells. The two-stage combustion process not only improves comfort but also contributes to lower greenhouse gas emissions.

Durability is another hallmark of these Sears models. With heavy-duty heat exchangers crafted from high-quality materials, they are built to withstand the rigors of regular use. Additionally, the inclusion of advanced safety mechanisms ensures that the system operates securely, reducing potential risks associated with gas furnaces.

The N9MP2125J20B1 model stands out due to its whisper-quiet operation. Homeowners can enjoy a warm home without the disruptive sound commonly associated with traditional heating systems, thanks to the insulated cabinet design and efficient blower operation.

Furthermore, these models come equipped with user-friendly digital thermostats, which allow precise temperature control and programmable settings, enabling homeowners to tailor their heating needs to fit their lifestyle. The compatibility with smart home systems also adds convenience, enabling users to manage their heating remotely, saving even more energy.

In conclusion, the Sears N9MP1075B12B1, N9MPD125L20B1, N9MP1050B12B1, N9MPD080J16B1, and N9MP2125J20B1 gas furnaces exemplify innovation in heating technology. Their energy-efficient designs, advanced features, and durable construction make them reliable choices for homeowners seeking comfort and sustainability in their heating solutions.