Images are representations only.

Series DFS Low Limit Freeze Protection Switch

Brand: Dwyer Instruments, LLC
Does not ship to United States
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
show more
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

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

Applications

  • Cooling Coil Frost Monitoring
  • HVac Systems