DWYER 下限冻结保护开关 DFS2
Series DFS2 Low Limit Freeze Protection Switch protects cooling coils in air handler systems by preventing frost build up. The thermostat and its capillary sensing element provide an antifreeze function by sensing the lowest temperature along any one foot section of capillary. The DPDT manual or automatic reset relays signal the building management system as well as cut off the fan. The Series DFS2 will detect temperature drops below the fixed safety value (set point) which can be set as low as 34°F (1°C) utilizing the visual set point indicator and set point screw.
Sensing Element:Vapor-filled capillary.
Operating Temperature:14°F to 54°F (-10°C to 12°C).
Storage Temperature:14°F to 158°F (-10°C to 70°C).
Capillary Overload Temperature:392°F (200°C), maximum 60 minutes.
Humidity Limit:0 to 95% RH, non-condensing.
Enclosure:Galvanized steel base, ABS cover.
Enclosure Rating:NEMA 1 (IP40).
Capillary Material:Copper.
Cable Entry:(1) M20 compression fitting.
Reset Action:Available in automatic or manual reset options.
Low-level Setpoint:Factory Set: 39°F (4°C), and safety lock secured; Adjustment via screwdriver slot.
Wire Connection:Terminal with wire-retaining screws.
Wire Size:Max. 14 AWG.
Electrical Rating:24 to 250 VAC, 15 (8) A.
Electrical Connections:Two each NO/NC/Common.
Deadband:1.8°F (fixed).
Weight:1.6 lb (0.7 kg).
Agency Approvals:CE.
| Model | Description |
| DFS2-DA10 | Low limit temperature control, 10 ft capillary with automatic reset |
| DFS2-DA20 | Low limit temperature control, 20 ft capillary with automatic reset |
| DFS2-DM10 | Low limit temperature control, 10 ft capillary with manual reset |
| DFS2-DM20 | Low limit temperature control, 20 ft capillary with manual reset |
