Furnace & HVAC

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McDonnell & Miller 354141 LONG BARREL PROBE

Xylem-McDonnell & Miller

MSRP: $344.75

Now: $266.40

McDonnell & Miller 354141 LONG BARREL PROBE FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

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McDonnell & Miller 340600 SA37-30, REPL.FLOAT

Xylem-McDonnell & Miller

MSRP: $419.58

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McDonnell & Miller 340600 SA37-30, REPL.FLOAT FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

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McDonnell & Miller FS5-1 1"FLOW SWITCH,SPDT,150#,114780

Xylem-McDonnell & Miller

MSRP: $546.12

Now: $422.00

McDonnell & Miller FS5-1 1"FLOW SWITCH,SPDT,150#,114780 FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $546.12

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McDonnell & Miller 343500 SA64-2,BELLOWS BASE ASSY.

Xylem-McDonnell & Miller

MSRP: $348.45

Now: $269.25

McDonnell & Miller 343500 SA64-2,BELLOWS BASE ASSY. FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

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McDonnell & Miller 354107 157RBP 3/4"NPT PROBE EA157L

Xylem-McDonnell & Miller

MSRP: $449.38

Now: $347.25

McDonnell & Miller 354107 157RBP 3/4"NPT PROBE EA157L FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

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McDonnell & Miller 354106 157RBP 2 1/4"PROBE EA157S

Xylem-McDonnell & Miller

MSRP: $473.35

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McDonnell & Miller 354106 157RBP 2 1/4"PROBE EA157S FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

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McDonnell & Miller PSE-802-U-24 LWCO 24V (153928)

Xylem-McDonnell & Miller

MSRP: $434.84

Now: $336.01

McDonnell & Miller PSE-802-U-24 LWCO 24V (153928) FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $434.84

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McDonnell & Miller 354140 Remote Probe 1/2"NPT

Xylem-McDonnell & Miller

MSRP: $219.27

Now: $169.43

McDonnell & Miller 354140 Remote Probe 1/2"NPT FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $219.27

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McDonnell & Miller 349500 SA159-24,LOWER QWIK HOOKUP ASM

Xylem-McDonnell & Miller

MSRP: $313.12

Now: $241.96

McDonnell & Miller 349500 SA159-24,LOWER QWIK HOOKUP ASM FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $313.12

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McDonnell & Miller 150-1 CASTING FOR 150 & 158

Xylem-McDonnell & Miller

MSRP: $520.62

Now: $402.30

McDonnell & Miller 150-1 CASTING FOR 150 & 158 FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements

MSRP: $520.62

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McDonnell & Miller 344200 SA67-2,FLOAT & BELLOWS ASSY.

Xylem-McDonnell & Miller

MSRP: $342.62

Now: $264.75

McDonnell & Miller 344200 SA67-2,FLOAT & BELLOWS ASSY. FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $342.62

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McDonnell & Miller 6667 HEAD MECH FOR 67 #153825

Xylem-McDonnell & Miller

MSRP: $655.54

Now: $506.56

McDonnell & Miller 6667 HEAD MECH FOR 67 #153825 FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $655.54

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McDonnell & Miller 310452 GRAY CARTRIDGE FOR 51 & 851

Xylem-McDonnell & Miller

MSRP: $415.37

Now: $320.97

McDonnell & Miller 310452 GRAY CARTRIDGE FOR 51 & 851 FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $415.37

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McDonnell & Miller 176319 PA-750-HP,HIGH PRESSURE PROBE

Xylem-McDonnell & Miller

MSRP: $259.35

Now: $200.40

McDonnell & Miller 176319 PA-750-HP,HIGH PRESSURE PROBE FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $259.35

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McDonnell & Miller PSE-801-120 LWCO 120V (153827)

McDonnell & Miller

MSRP: $396.00

Now: $300.00

McDonnell & Miller PSE-801-120 LWCO 120V (153827) FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $396.00

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McDonnell & Miller FS5-3/4 3/4"FLOW SW.SPDT,150#,#114760

Xylem-McDonnell & Miller

MSRP: $546.12

Now: $422.00

McDonnell & Miller FS5-3/4 3/4"FLOW SW.SPDT,150#,#114760 FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $546.12

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McDonnell & Miller FS4-3D 1"FLO SW.w/2-SPDT SW.#114550

Xylem-McDonnell & Miller

MSRP: $500.41

Now: $386.68

McDonnell & Miller FS4-3D 1"FLO SW.w/2-SPDT SW.#114550 FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $500.41

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McDonnell & Miller 345700 SA91-60,FLOAT&GASKET FOR 93/94

Xylem-McDonnell & Miller

MSRP: $527.44

Now: $407.57

McDonnell & Miller 345700 SA91-60,FLOAT&GASKET FOR 93/94 FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $527.44

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Xylem McDonnell & Miller #2 SPDT SWITCH (pn110000)

Xylem-McDonnell & Miller

MSRP: $366.86

Now: $283.48

Xylem McDonnell & Miller #2 SPDT SWITCH (pn110000) FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements

MSRP: $366.86

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McDonnell & Miller 310447 14-B,BLOWDOWN BALL VALVE

Xylem-McDonnell & Miller

MSRP: $281.49

Now: $217.52

McDonnell & Miller 310447 14-B,BLOWDOWN BALL VALVE FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $281.49

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Furnace Replacement Parts & HVAC System Components

Furnace replacement parts are critical to maintaining the performance and safety of any heating system. In both residential and commercial HVAC applications, a furnace relies on numerous components working together to heat air and circulate it throughout a building. These HVAC system components – from burners and heat exchangers to controls and sensors – must function correctly to ensure efficient operation and reliability. When any part fails or wears out, using quality replacement components (preferably OEM furnace parts) helps restore the system’s performance and prolong its lifespan.

Key HVAC Components in Furnaces

Blower Motors: The blower motor is an electric motor that drives a fan to circulate air through the furnace and ductwork. It pushes air across the heat exchanger to distribute warm air during heating, and also circulates air over the AC evaporator coil during cooling\. A properly functioning blower motor maintains airflow and consistent temperature throughout the space.
Ignition Modules & Ignitors: Modern furnaces use electronic ignition systems. An ignition module manages the sequence of operations for lighting the burner – it sends a spark or powers a hot-surface ignitor, opens the gas valve, and monitors the flame to ensure safe ignition. If the flame isn’t detected within a few seconds, the module will shut down the gas for safety. Hot surface ignitors (glow plugs) and spark ignitors work with the module to ignite the fuel reliably.
Limit Switches (Safety Controls): A limit switch is a temperature-activated safety device that prevents overheating. If the furnace’s internal temperature rises too high (for example, due to a blower failure or restricted airflow), the limit switch will open the circuit to shut off the burner. This protects the heat exchanger and other components from damage and is crucial for furnace safety. Many furnaces use a fan limit switch that also controls the blower fan on/off timing for heating.
Control Boards: Often called furnace control boards or integrated furnace controllers, these are the “brains” of the furnace. Control boards regulate key functions like blower fan timing, ignition sequence, and gas valve operation. In some systems, a control board incorporates the ignition control as well, managing everything from the inducer fan and ignition spark to blower delays. A faulty control board can lead to various operational issues, so replacing it with the correct OEM board is important for proper furnace performance.
Combustion Components (Burners & Sensors): The burners are where fuel combustion occurs to create heat, and they feed the heat exchanger. Replacing burners may be necessary if they become corroded or damaged. Additionally, flame sensors (or thermocouples in older units) are small but essential parts that detect the burner flame; if the flame sensor fails, the furnace may shut off the gas for safety. Maintaining these components ensures the furnace ignites correctly and operates safely.

OEM Furnace Parts and Compatibility

When replacing furnace components, opting for OEM parts (Original Equipment Manufacturer parts) is often recommended. OEM furnace parts are made by the furnace’s manufacturer or an approved vendor to match the original specifications exactly. This guarantees proper fit and function within the system. Using OEM replacements provides “guaranteed compatibility” and reliability with the existing equipment. In contrast, generic or aftermarket parts might save cost upfront but can introduce compatibility issues – they may not align perfectly with the furnace’s design, potentially reducing efficiency or causing malfunctions. Moreover, nonOEM parts could even void manufacturer warranties in some cases. In summary, genuine OEM parts help ensure that the repaired furnace operates as intended, sustaining performance and safety standards set by the manufacturer.

Furnace Parts for Commercial HVAC Systems

Commercial HVAC parts serve the same fundamental purposes as those in residential systems – moving air, igniting fuel, regulating temperature, etc. – but are often built for heavier duty and larger capacity. Commercial furnaces and rooftop units may use larger blowers, higher-output burners, and more robust heat exchangers to handle the heating demands of big spaces. They might also be configured as packaged units (especially in large buildings) where the furnace, blower, and AC components are integrated in one system. The parts themselves, however, still include familiar items like blower motors, ignition modules, sensors, limit switches, and control boards, just scaled up or reinforced for continuous operation. Using high-quality parts in commercial HVAC systems is critical: it ensures the system runs smoothly under intensive use, reducing energy waste and improving reliability. In fact, investing in quality commercial HVAC replacement parts can significantly enhance system performance and efficiency for businesses. Whether for a home furnace or an industrial heating unit, the goal in replacing parts is the same – to maintain safe operation and optimal heating performance.

Frequently Asked Questions (FAQ)

What are the most common furnace replacement parts?

Common furnace replacement parts include blower motors, ignitors (hot surface ignitors or spark ignitors), ignition control modules, flame sensors, gas valves, and limit switches. These components frequently wear out or fail over time. For example, blower motors have moving parts that can burn out, and ignitors are fragile and crack with age. Control boards and thermostats may also require replacement if they malfunction. Keeping these parts in good working order is essential, as each plays a role in the furnace’s ability to heat effectively and run safely.

How does a furnace limit switch improve safety?

The limit switch is a safety device that monitors the furnace’s internal temperature. If the furnace gets too hot – for instance, if the blower motor isn’t moving enough

air to cool the heat exchanger – the limit switch opens the electrical circuit to shut off the burner. This prevents the furnace from overheating and potentially causing damage or creating a fire hazard. Once the furnace cools to a safe temperature, the switch resets (on many models) allowing normal operation to resume. In short, the limit switch protects both the equipment and your home by acting as an automatic safety cutoff.

What does a furnace ignition module do?

An ignition module (sometimes called an ignition control) is an electronic component that controls the burner ignition process in a furnace. Its primary job is to light the burners safely. When the thermostat calls for heat, the ignition module initiates a sequence: it powers the ignitor or spark electrode and opens the gas valve to ignite the burner flame. The module also monitors the flame via a sensor. If a flame isn’t detected within a few seconds, the module will shut off the gas to prevent a dangerous gas buildupIn many modern furnaces, the ignition module is part of the main control board. A faulty ignition module can prevent the furnace from lighting at all, so replacing it promptly restores proper heating function.

Why choose OEM furnace parts for replacements?

OEM furnace parts are recommended because they ensure compatibility and original performance. OEM parts are made to the exact specifications of the furnace’s manufacturer, guaranteeing a precise fit and correct operation with the other components. This precise fit and high reliability mean the part will support the furnace’s efficiency and longevity as intended. By contrast, using aftermarket or “one-size-fits-all” parts can be a gamble – the part might physically fit, but it could have slight differences that lead to reduced efficiency or even system malfunctions. Additionally, OEM parts often carry better warranties and won’t risk voiding the furnace’s warranty. While they may cost a bit more initially, OEM parts often provide better long-term value by ensuring the furnace runs smoothly and reliably after repairs.

Are commercial HVAC parts different from residential furnace parts?

The fundamental parts of a furnace or HVAC system are similar in function whether in a home or a commercial building – both use blowers, burners/heat exchangers, filters, control systems, etc. The differences lie in scale, configuration, and durability. Commercial HVAC parts are typically larger, heavier-duty, and designed to handle greater heating/cooling loads continuously. For example, a commercial system might use multiple large blower motors or a bigger heat exchanger to serve a huge space, whereas a residential furnace has a single smaller blower for a house. Commercial units often use higher-voltage blowers or three-phase motors and may come as packaged units (combining AC and furnace in one rooftop box) for space and efficiency. Residential systems are usually split (separate furnace and AC) and lower capacity. Despite these differences, maintaining reliability and efficiency is crucial for both. Quality replacement parts are important in commercial systems because any downtime can affect many people and lead to high costs; similarly, in a home furnace, reliable parts keep the system running safely and efficiently. In summary, while the parts serve the same purposes, commercial HVAC parts are built for higher performance and tougher duty, and they must be matched to the specific requirements of the larger systems.