Condensate Line Raised by Base

25-20-52

8. Checks and Adjustments

Startup

NOTE: Refer to the start-up procedures in the "User's Informa-

tion Manual' or to the "Operating Instructions Label' on the fur- nace.

CAUTION

If any sparks, odors or unusual noises occur, immediately

shut OFF power to furnace. Check for wiring errors or

obstruction to blower.

Gas Supply Pressure

Gas supply pressure should be within minimum and maximum values listed on rating plate. Pressures a re usually set by gas sup- pliers.

Manifold Gas Pressure Adjustment

NOTE: Make adjustment to manifold pressure with burners oper- ating.

FIRE OR EXPLOSION HAZARD

Failure to turn OFF gas at shut off before connecting

manometer can result in death, personal injury and/or

property damage.

Turn OFF gas at shut off before connecting manometer.

Pilot Burner

10-11-65

Main Burner Flame Check

Allow the furnace to run approximately 10 minutes then inspect the main burner and pilot flames. See Figure 42.

Check for the following (Figure 42):

•Stable and blue flames. Dust may cause orange tips or wisps of yellow, but flames MUST NOT have solid, yel- low tips.

•Flames extending directly from burner into heat ex- changer.

•Flames do NOT touch sides of heat exchanger.

If any problems with main burner flames are noted, it may be nec- essary to adjust gas pressures, or check for drafts.

1.Remove the burner compartment door.

2.With gas OFF, connect manometer to tapped opening on gas valve. Use manometer with a 0 to 15" water column range.

3.Turn gas ON and remove adjustment screw cover on gas

valve. Turn counterclockwise to decrease pressure and clockwise to increase.

4.For altitudes up to 2000', set pressure to value shown in Table 6, 0.3 (8mm) water column. For altitudes of 2000'

to 8000', see Section 5 for correct pressure setting.

Adjust Pilot Burner

The furnace has a pilot flame to light the main burner. The flame should surround 3/8" to 1/2" of the flame sensor. See Figure 41. To adjust, remove cap from pilot adjusting screw on gas valve. Turn

screw counterclockwise to increase or clockwise to decrease flame as re uired. Re lace adhJstin screw ca .

E_

Main Burner

10-10-78

Temperature Rise Check

The blower speed MUST be set to give the correct air temperature rise through the furnace as marked on the rating plate. Tempera- ture rise is the difference between supply and return air tempera- tures.

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Sears 9MPD, N9MP2, N9MP1 manual Checks and Adjustments, Main Burner Flame Check, Adjust Pilot Burner, Temperature Rise Check
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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.
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