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Supco

USAHVAC & Refrigeration

Supco, short for Sealed Unit Parts Company, is a manufacturer of controls, service tools, and diagnostic instruments for the HVAC and refrigeration industry. Founded in the mid-20th century, the brand has built a catalog that addresses the practical needs of technicians and maintenance teams working on commercial and light industrial cooling systems. The product line spans several core families: compressor starters and hard-start devices, relays, defrost thermostats, surface-mount limit controls, hot surface ignitors, drain traps, and a range of service valves and piercing tools. Additionally, Supco offers data-logging instruments and circular chart recorders for environmental monitoring. The portfolio is designed around standard HVAC practices, making components compatible across a wide range of OEM equipment without requiring proprietary interfaces.

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About Supco

Supco, short for Sealed Unit Parts Company, is a manufacturer of controls, service tools, and diagnostic instruments for the HVAC and refrigeration industry. Founded in the mid-20th century, the brand has built a catalog that addresses the practical needs of technicians and maintenance teams working on commercial and light industrial cooling systems. The product line spans several core families: compressor starters and hard-start devices, relays, defrost thermostats, surface-mount limit controls, hot surface ignitors, drain traps, and a range of service valves and piercing tools. Additionally, Supco offers data-logging instruments and circular chart recorders for environmental monitoring. The portfolio is designed around standard HVAC practices, making components compatible across a wide range of OEM equipment without requiring proprietary interfaces.

For the technical buyer, Supco components are specified with clear electrical and mechanical ratings. For example, the SHM350 surface-mount limit control is a manual-reset, open-on-rise SPST device rated for 350°F opening temperature and available for 120V AC or 240V AC circuits. It carries CSA and UL certifications, which are relevant for installations requiring third-party safety approvals. Similarly, the IG418 universal hot surface igniter operates on 120V AC, uses a silicon carbide flat-tip element, and comes with a 15.5-inch lead length, making it a direct replacement for specific Robertshaw models. These specifications allow engineers to match components to existing system parameters without guesswork.

Supco also addresses operational and maintenance challenges. The NPW1H negative pressure drain trap, with its PVC body and universal compatibility, is designed to collect condensate in systems operating under negative pressure, preventing water damage and maintaining system efficiency. The SL5709 defrost thermostat is tailored for commercial refrigeration, specifically compatible with Larkin brand equipment, and controls defrost cycles to prevent ice buildup. On the diagnostic side, the CR4 circular chart recorder monitors temperature in Fahrenheit and sound levels, with an accuracy of ±1% for temperature and ±1.0% for sound, and includes 60 assorted charts for extended logging. The SL300TH data logger, mentioned in the brand's broader line, records temperature and humidity with configurable sampling intervals and battery life exceeding 20 months, supporting compliance verification in temperature-critical environments.

3G Electric supplies Supco products as part of its industrial equipment distribution, ensuring that plant engineers and maintenance managers can source these components alongside other HVAC and refrigeration parts. The availability of Supco items through 3G Electric covers the range from simple service tools like pocket thermometers and nitrogen purge connectors to more complex controls and recorders. This integration allows procurement specialists to consolidate orders for both routine maintenance and system upgrades, with the assurance that Supco's specifications meet the demands of commercial and light industrial applications.

Common Applications

  • Commercial refrigeration maintenance — Supco SL5709 defrost thermostat for Larkin evaporator coils
  • HVAC system troubleshooting — Supco IG418 universal hot surface igniter for gas furnace replacement
  • Condensate management in negative pressure systems — Supco NPW1H drain trap for rooftop units
  • Temperature and sound logging in cold storage — Supco CR4 circular chart recorder for compliance documentation
  • Compressor protection in light industrial cooling — Supco CSS-25U hard-start device for inrush current control
  • Safety limit control in heating appliances — Supco SHM350 surface-mount limit control for over-temperature shutdown
Origin: Manufactured in USA

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Frequently asked questions

Common questions about Supco from 3G Electric.

What certifications does the Supco SHM350 surface-mount limit control carry?

The Supco SHM350 surface-mount limit control is certified by CSA and UL, making it suitable for installations that require third-party safety approvals. It is a manual-reset, open-on-rise SPST device rated for a 350°F opening temperature and is available for 120V AC or 240V AC circuits. These certifications indicate that the component has been tested for electrical safety and performance under standard conditions, which is important for compliance in commercial and industrial settings.

How does the Supco IG418 hot surface igniter compare to OEM models?

The Supco IG418 is a universal hot surface igniter designed as a replacement for specific Robertshaw OEM models. It operates on 120V AC and uses a silicon carbide flat-tip element, which is a common material for hot surface igniters due to its durability and heat resistance. The igniter features a hardwired electrical connection and a 15.5-inch lead length, providing flexibility in installation. Its universal design means it can be used in a variety of gas-fired heating systems, but it is always advisable to verify compatibility with the specific appliance model before installation.

What is the purpose of the Supco NPW1H negative pressure drain trap?

The Supco NPW1H negative pressure drain trap is designed to collect condensate in HVAC and refrigeration systems that operate under negative pressure. Its PVC body is resistant to corrosion and suitable for a range of environmental conditions. The trap is universally compatible, meaning it can be used with various equipment brands and models. By preventing air from being drawn into the system through the drain line, it helps maintain proper pressure differentials and prevents water damage. The trap measures 5 5/8 inches in length, making it compact enough for tight spaces.

Which Supco defrost thermostat is compatible with Larkin equipment?

The Supco SL5709 defrost thermostat is specifically compatible with Larkin brand and series equipment. It is designed for commercial refrigeration systems to control defrost cycles, preventing ice buildup on evaporator coils. This thermostat helps maintain efficient operation by automatically initiating defrost at set intervals or temperatures, reducing the need for manual intervention. When replacing a defrost thermostat, it is important to match the control parameters to the system's requirements, and the SL5709 is engineered to meet those needs for Larkin units.

What are the accuracy specifications of the Supco CR4 circular chart recorder?

The Supco CR4 circular chart recorder measures temperature in degrees Fahrenheit and sound levels, with an accuracy of ±1% for temperature and ±1.0% for sound. It operates on a rotating paper chart, providing a continuous visual record over time. The unit includes 60 assorted charts, allowing for extended monitoring periods without immediate replacement. This recorder is suitable for applications where temperature and noise levels need to be documented, such as in environmental monitoring or equipment performance verification. The ±1% accuracy is typical for industrial chart recorders and meets common compliance requirements.

What voltage and amperage ranges do Supco compressor starters cover?

Supco compressor starters and hard-start devices are available for standard voltage classes, including 115V AC and 230V AC, and cover a range of compressor sizes from 1/12 horsepower up to multi-ton capacities. For example, the CSS-25U progressive unit uses a potential-relay design to manage inrush current, providing soft-start or instant-restart functionality depending on the application. These starters are designed to protect compressors from hard starting conditions, extending equipment life. When selecting a starter, it is essential to match the voltage and horsepower rating to the compressor's specifications to ensure proper operation.