Series DFS Low Limit Freeze Protection Switch

Brand: Dwyer Instruments, LLC

The Series DFS Low Limit Freeze Protection Switch protects cooling coils in air handler systems by preventing frost build up on the coils.

By sensing the lowest temperature along any 1' section of capillary, the DPDT manual or automatic reset relays signal the building management system, as well as cut off the fan. 

Set points can be adjusted as low as 1° C (34° F) utilizing the visual set point indicator and set point screw.

The Series DFS includes mounting clips for easy installation.
Features
  • DPDT Switch Feedback
  • Setpoint as low as 1° C (34 ° F)
  • Mounting Clips Included

Models matching criteria: 4
  • Reset Options - Automatic Reset
  • Capillary Length - 20 Foot Capillary
100+ In Stock
$707.00 CAD
Does not ship to OH, United States
  • Reset Options - Manual Reset
  • Capillary Length - 10 Foot Capillary
50+ In Stock
$1,360.00 CAD
Does not ship to OH, United States
  • Reset Options - Automatic Reset
  • Capillary Length - 10 Foot Capillary
50+ In Stock
$1,665.00 CAD
Does not ship to OH, United States
  • Reset Options - Manual Reset
  • Capillary Length - 20 Foot Capillary
25+ In Stock
$1,199.00 CAD
Does not ship to OH, United States

Specifications

Adjustment Type

  • Field Adjustable

Approvals & Certifications

  • cUL
  • UL

Capillary Length

  • 10 feet (3 metres)
  • 20 feet

Capillary Material

  • Copper

Deadband, Approximate

  • 2.5° C (4.5° F)

Electrical Connectors

  • 1/2” NPT

Electrical Rating

  • 14 FLA, 84 LRA, 3/4 hp at 120 Vac, 12 FLA, 72 LRA, 2 hp at 240 Vac
  • 720 VA, Max.

Enclosure, Body Material

  • Plated Steel

Maximum Sensor / Probe Temperature

  • 149° C (300° F)

Operating Temperature

  • -51° to 71° C (-60° to 160° F)

Operating Temperature - Sensor

  • 149° C (300° F)

Set Point - Decreasing

  • 1° to 21° C
  • 1° to 21° C (34° to 70° F)

Set Point - Increasing

  • 1° to 21° C
  • 1° to 21° C (34° to 70° F)

Switch Type

  • DPDT

Wetted Materials

  • Tin-Plated Copper

  • Cooling Coil Frost Monitoring
  • HVac Systems

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