Dwyer Instruments SERIES DFS2 Catalog Page

MOUNTING

CAPILLARY

7/16 [11.11] MANUAL

SERIES DFS2

5/8

[15.79]

5/8

[101.60]

Ø3/16

[8.05]

2 [50.80]

[5.84]

[19.81]

Ø15/32

2-13/64

1-27/64

LOW LIMIT FREEZE PROTECTION SWITCH

Manual and Automatic Reset

Manual reset

option shown

13/32

[10.32]

HOLE

M20

4-9/64 [110.67]

2-7/8 [73.03]

13/64 [5.16]

1-5/32 [29.37]

Ø3/32

[Ø2.38]

33/64 [13.10]

3-17/64

[82.95]

1-31/32

[50]

19/32

[15.03]

RESET UNITS ONLY

2-3/32 [53.18]

19/32

[15.03]

3/32

[2.38]

29/32

[23.02]

Ø1-37/64

[Ø40.08]

The 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 xed 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.

FEATURES/BENEFITS

• Vapor-lled copper capillary sensing element

• Joint spring protector at capillary-bellow connection

• Set point safety-lock protection and simple adjustment

• Easy installation and wiring

• Automatic and manual reset

MODEL CHART Model Reset Action Capillary Length DFS2-DA10

DFS2-DA20 DFS2-DM10 DFS2-DM20

Automatic Automatic Manual Manual

10´ (302 cm) 20´ (609 cm) 10´ (302 cm) 20´ (609 cm)

APPLICATIONS

• HVAC equipment

• Heat exchangers and

cooling coils

SPECIFICATIONS Sensing Element: Vapor-lled 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

tting.

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 wireretaining screws.

Wire Size: Max. 14 AWG. Electrical Rating: 24-250 VAC, 15 (8) A. Electrical Connections: Two each NO/

NC/Common.

Deadband: 1.8°F (xed). Weight: 1.6 lb (0.7 kg). Agency Approvals: CE.

ACCESSORIES Model Description A-DFS2-C Capillary mounting clips (6 pieces)

129DWYER INSTRUMENTS, INC.