Beverage-Air 402-218B OEM Drum Thermometer – -40°F to +140°F

Beverage-Air 402-218B OEM Drum Thermometer – -40°F to +140°F

The Beverage-Air 402-218B Drum Thermometer is a genuine OEM legacy mechanical temperature-display component used in compatible Beverage-Air commercial refrigeration equipment. This vapor-tension style drum thermometer provides a clear cabinet-temperature reference across a published range of approximately -40°F to +140°F (-40°C to +60°C).

The thermometer uses a remote sensing bulb and approximately 60-inch capillary so cabinet temperature can be displayed at the equipment instrument panel while the sensing element remains positioned in the designated refrigeration area.

Accurate temperature indication is important for commercial refrigeration monitoring because operators and service technicians rely on visible cabinet-temperature information when evaluating equipment operation, product-storage conditions, and refrigeration performance.

OEM Part Details & Specifications

• Manufacturer: Beverage-Air
• OEM Part Number: 402-218B
• MPN: 402-218B
• Part Type: Vapor-Tension Drum Thermometer
• Display: Mechanical Drum
• Temperature Range: -40°F to +140°F
• Celsius Range: approximately -40°C to +60°C
• Scale: Dual Fahrenheit / Celsius
• Capillary Length: approximately 60"
• Panel Opening Reference: approximately 1" x 2-5/16"
• Application: Commercial Refrigeration Equipment
• Function: Cabinet Temperature Monitoring

Legacy OEM Status

Beverage-Air OEM part number 402-218B is a legacy drum thermometer that has since been discontinued. Current OEM parts sources identify 402-258B-01 as its replacement.

• Legacy OEM: 402-218B
• Current Replacement: 402-258B-01 Digital Thermometer

If servicing an older cabinet that was originally equipped with the 402-218B mechanical drum thermometer, verify whether the repair requires the original-style legacy component or the current Beverage-Air replacement before ordering.

What the Beverage-Air 402-218B Thermometer Does

The 402-218B provides a visible mechanical temperature reading for the refrigerated cabinet. Temperature changes at the remote sensing bulb are transmitted through the sealed capillary system to the drum display.

Proper thermometer operation helps support:

• Visible cabinet-temperature monitoring
• Routine refrigeration checks
• Food-storage temperature observation
• Technician troubleshooting
• Recognition of unusual temperature changes
• Commercial refrigeration operating awareness

Thermometer vs. Temperature Control

The 402-218B is a temperature indicator, not the thermostat or electronic controller that directly cycles the refrigeration system.

• Drum Thermometer: Displays cabinet temperature.
• Thermostat / Controller: Regulates refrigeration operation.

If the cabinet is running too warm or too cold, do not automatically replace the thermometer. The refrigeration control and complete system should be diagnosed separately.

Verified Beverage-Air Applications

Beverage-Air service documentation identifies 402-218B as the drum thermometer on legacy equipment including:

• ER24 / EF24
• KR24 / KF24
• KR36 / KF36
• KR48 / KF48
• KR74 / KF74

Fitment Note: This should not be treated as a complete compatibility list. Verify the complete Beverage-Air model, serial number, original thermometer, panel opening, capillary length, sensing-bulb location, and service documentation before ordering.

60-Inch Capillary Sensing System

Published service data identifies the 402-218B with an approximately 60-inch capillary. Capillary length and routing are important because the sensing bulb must reach the intended location without being stretched, kinked, crushed, cut, or sharply bent.

Before ordering, compare:

• Capillary length
• Sensing bulb configuration
• Probe location
• Panel opening
• Display orientation
• Mounting arrangement
• Original component markings

Common Signs of a Drum Thermometer Problem

• Displayed temperature is obviously incorrect
• Reading does not respond to cabinet temperature changes
• Drum display sticks at one value
• Scale is difficult to read
• Capillary tube is kinked or damaged
• Sensing bulb is loose or incorrectly positioned
• Display housing is physically damaged
• Reading differs significantly from a verified reference thermometer

These symptoms do not automatically confirm thermometer failure. Incorrect sensing-bulb placement, airflow, door leakage, refrigeration-system problems, and actual cabinet-temperature changes can produce an unexpected reading.

Diagnosing an Incorrect Temperature Reading

If the displayed temperature does not appear accurate, compare it with a calibrated or known-good reference thermometer before replacing the 402-218B.

Inspect:

• Actual cabinet temperature
• Sensing bulb location
• Capillary condition
• Display mounting
• Evaporator airflow
• Door gasket condition
• Refrigeration-system operation

Inspect the Capillary & Sensing Bulb

The thermometer uses a sealed vapor-tension sensing system. Physical damage to the capillary or sensing bulb can prevent proper temperature indication.

Inspect for:

• Kinks
• Sharp bends
• Crushed sections
• Cuts
• Pinching
• Incorrect routing
• Loose sensing-bulb mounting

Do not cut, shorten, splice, or sharply bend the capillary tube.

Technician Checks Before Ordering

• OEM part number 402-218B
• Complete Beverage-Air equipment model
• Equipment serial number
• Original drum thermometer configuration
• -40°F to +140°F range
• Dual Fahrenheit / Celsius scale
• Approximately 60" capillary
• Panel opening dimensions
• Sensing-bulb location
• Mounting arrangement

Do not select a refrigeration thermometer by appearance alone. Similar drum thermometers can use different temperature ranges, capillary lengths, panel openings, scales, and sensing arrangements.

Commercial Refrigeration Applications

Beverage-Air mechanical thermometers are used in commercial refrigeration environments including:

• Reach-in refrigerators
• Reach-in freezers
• Commercial food-storage cabinets
• Restaurants
• Commercial kitchens
• Hotels
• Schools
• Hospitals
• Institutional kitchens
• Foodservice facilities

Installation & Service Notes

Before removing the original thermometer, document:

• Display orientation
• Panel mounting
• Capillary routing
• Sensing-bulb location
• Retaining hardware
• Original component markings

Compare the replacement 402-218B with the original component before installation.

After installation, verify:

• Display is securely mounted
• Capillary is not kinked or pinched
• Sensing bulb is correctly positioned
• Reading changes with cabinet conditions
• Displayed temperature is reasonable compared with a verified reference thermometer

Why Correct Beverage-Air OEM Identification Matters

Mechanical refrigeration thermometers can look nearly identical while using different temperature ranges, capillary lengths, mounting openings, and sensing arrangements.

Using Beverage-Air OEM 402-218B provides the correct identification for the original legacy drum thermometer, while 402-258B-01 identifies the current Beverage-Air replacement.

Frequently Asked Questions

What is Beverage-Air 402-218B?

Beverage-Air 402-218B is a genuine OEM legacy mechanical drum thermometer used in compatible commercial refrigeration equipment.

What temperature range does 402-218B display?

Published parts information lists approximately -40°F to +140°F, equivalent to about -40°C to +60°C.

How long is the capillary?

Published service data identifies an approximately 60-inch capillary.

Is 402-218B a vapor-tension thermometer?

Yes. It is a remote-sensing mechanical drum thermometer using a capillary sensing system.

Is 402-218B still current?

No. Current OEM parts sources list 402-218B as obsolete and replaced by Beverage-Air 402-258B-01.

What replaces Beverage-Air 402-218B?

The current Beverage-Air replacement is 402-258B-01 Digital Thermometer.

Is this a thermostat?

No. It displays cabinet temperature but does not directly control compressor cycling.

Can a damaged capillary cause an incorrect reading?

Yes. Kinks, crushing, cuts, or other damage to the sealed sensing system can prevent accurate temperature indication.

Which Beverage-Air models used 402-218B?

Beverage-Air manuals identify applications including ER/EF24 and KR/KF24, 36, 48 and 74 series equipment. Verify the complete model and serial number before ordering.

Can I replace it with another drum thermometer that looks similar?

No. Verify OEM number, temperature range, capillary length, panel opening, scale, sensing arrangement, model, and serial number.

How do I confirm Beverage-Air 402-218B is correct?

Verify OEM part number 402-218B, complete Beverage-Air model and serial number, original thermometer, temperature range, capillary length, panel opening, and sensing-bulb location.

Is professional installation recommended?

Qualified commercial refrigeration personnel can verify sensing-bulb placement, capillary routing, panel mounting, and displayed temperature during replacement.

Why Buy From Parts Direct Online?

Parts Direct Online supplies Beverage-Air thermometers, temperature controls, probes, fan motors, heaters, relays, gaskets, and related commercial refrigeration replacement parts for service technicians, contractors, restaurants, supermarkets, hotels, institutional kitchens, and foodservice operations throughout the United States.