Johnson Controls A70HA-1 Low Temperature Limit Control 15-55°F Manual Reset 20' Capillary

The Johnson Controls A70HA-1 is a rugged, reliable low-temperature limit control designed for commercial refrigeration and heating systems. This heavy-duty temperature control incorporates a vapor-charged sensing element with a 20-foot capillary that allows flexible installation and monitors the coldest spot along its length.

Key Features:

• 15-55°F temperature range with manual reset functionality
• Four-wire, two-circuit contact block with isolated contacts that transfer at set point - when main contact opens, auxiliary contact closes simultaneously
• Locks out at 35°F with manual reset required to restore operation
• 20-foot 1/8" O.D. capillary tubing for extended reach applications
• 120-240 VAC operation with 400°F maximum bulb temperature rating
• Heavy gauge low-profile stainless steel element cup protects against mechanical damage
• Approximately 5°F fixed differential (non-adjustable)

Typical applications include shutdown of ventilation systems and building automation system alarm indication upon low or high temperature. This reverse acting temperature controller is ideal for applications requiring safety lockout on temperature drop, making it perfect for critical systems that demand protection from freezing or overcooling. The A70HA-1 replaces older models including the A70HA-1C, 2284-900, and A19AAC-1.