Description
The Honeywell L480B is a low-limit temperature controller designed for use in air conditioning systems and refrigerated enclosures.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Honeywell |
| Category |
|
| Part Number |
L480B |
| Subcategory |
Mechanical Temperature Controllers |
| Switching Action |
Breaks control circuit on temperature fall. Manual reset |
| DC Rating |
0.2A at 120 VDC, 0.1A at 240 VDC |
| Pilot Duty Rating |
125 VA |
| Ambient Temperature Range |
-20°F to +125°F (-11°C to +52°C) |
| Maximum Sensor Temperature |
225°F (107°C) |
| Operating Temperature Range |
20°F to 60°F (-5°C to +15°C); Dual Fahrenheit/Celsius
scaleplate |
| Temperature Sensing Means |
20 ft (6m) element, no sensing bulb |
| Temperature Setting Means |
A slotted screw at the top of the controller. The setpoint is
indicated through a scale opening in the cover |
| Differential |
Nonadjustable, additive, and fixed, 10°F (6°C) maximum |
| Finish |
Gray |
| Mounting Means |
Mounting lugs located on back of case |
| Weight |
1.6 lbs |
Information About L480B
The Honeywell L480B is a low-limit mechanical temperature controller designed for use in air conditioning and refrigeration systems to prevent coil freeze-up or ensure temperature safety in cooling environments. Commonly referred to as a "freezestat," it monitors air or surface temperature and automatically resets if temperature conditions return to safe levels. It features a 20-foot capillary sensing element and is built for dependable operation in applications such as display cases, beverage coolers, freezer cabinets, and walk-in units. The L480B is widely used in commercial refrigeration and agricultural frost protection.
Key Features:
- Application-Specific Design: Ideal for refrigerated enclosures, air handlers, and frost monitoring systems.
- Temperature Range: Adjustable setpoint from 20°F to 60°F (–6.7°C to 15.6°C).
- Fixed Differential: 10°F (5.6°C) differential provides consistent performance and reset behavior.
- Capillary Sensing Element: Includes a 20-foot (6.1 m) capillary tube for remote sensing.
- Switch Type: SPDT (Single Pole, Double Throw) switch with automatic reset for reliable temperature control.
- Rugged Construction: Enclosed dustproof and moisture-resistant switch housing enhances durability.
- Mounting Flexibility: Can be mounted horizontally or vertically for versatile installation.
- Voltage Compatibility: Rated for 120/240 VAC operation.
- Certifications: UL Listed and CSA Certified for safety compliance.
- Weight: Approximately 1.6 lbs (0.73 kg)
The L480B offers reliable and simple protection against low-temperature damage in refrigeration and HVAC systems. With its extended sensing capability and durable design, it is a trusted solution for maintaining temperature stability in both commercial and agricultural environments.
