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Technical Instructions

Document No. 155-057P25

SW 251-1

Rev. 1, May, 2000

SW 251 Pressure Electric Switches

Siemens Building Technologies, Inc.

Description

SW 251 Pressure-Electric Switches are pressure operated snap switches that actuate

electrical circuits from pneumatic control signals.

Product Numbers

Table 1.

Electrical Ratings* Factory Settings

Inductive Non-Inductive PSI (kPa)

Differential

PSI (kPa)

Full Load AMPS Locked Rotor AMPS AMPS

Product

Number

No.

Inputs

No.

Stages

Type Value 120V 208V 240V 120V 208V 240V 120V 208V 240V 277V 480V

Wiring

Diagram

Set Point

R to Y

Set Point

Diff. R to B

251-0001

Adj.

2-8

(14- 55)

8.0

(55)

4.0

(28)

251-0002

1.5

(10)

6.0 3.4 3.0 36.0 20.4 18.0 10.0 5.7 5.0 4.3

8.0

(55)

6.5

(45)

251-0004

0 .5-± 0.1

(3.4±0.7)

3.0 1.7 1.5 18.0 10.2 9.0 5.0 2.8 2.5 2.1

N.A.

SPDT Action

8.0

(55)

7.7

(53)

251-0006

Fixed

1.5

(10)

10.0 5.7 5.0 60.0 34.2 30.0 22.0 22.0 22.0 22.0 12.0

SPST 8.0

(55)

6.5

(45)

251-0008

Switch

Fixed

Between

Stage

Adj.

1.5

(10)

1-25

(7-170)

10.0 5.7 5.0 4.3

SPDT

Switch 1

11.0 (76)

Switch 2

13.0 (90)

9.5 (65)

11.5 (79)

251-0009

All

Switches

Fixed

1.5

(10)

Switch 1

5.0 (34)

Switch 2

& 3

22.0

(152)

3.5 (24)

20.5

(141)

251-0011

Switch 1

Fixed

Switches

2 & 3

Adj.

1.5

(10)

3-8

( 21- 55)

6.0 3.4 3.0 36.0 20.4 18.0

8.0 4.6 4.0 3.4

N.A.

SPST (N.C.)

Action

Switch 1

5.0 (34)

Switches

2 & 3

22.0

(152)

3.5 (21)

14.0 (96)

251-0014 Similar to -251-0001 except with scale in kg/cm

* Pilot Duty Ratings: Product No. 251-0006 – 360 Va, 120 to 480 Vac

251-0015 Similar to 251-0002 except with scale in kg/cm

Other Products – 125 Va, 120 To 277 Vac

** Total connected load not to exceed 2000 Va

Discontinued

Summary of content (6 pages)

PAGE 1
Technical Instructions Document No. 155-057P25 SW 251-1 Rev. 1, May, 2000 PowersTM Controls ue d SW 251 Pressure Electric Switches tin SW 251 Pressure-Electric Switches are pressure operated snap switches that actuate electrical circuits from pneumatic control signals. Description Table 1. Product Numbers 251-0001 Differential PSI (kPa) Type Value Adj. 2-8 (14- 55) Fixed 1.5 (10) 1 251-0004 0 .5-± 0.1 (3.4±0.7) 1 1.
PAGE 2
Technical Instructions Document Number 155-057P25 Rev. 1, May, 2000 Specifications (Applicable to all models unless otherwise noted) Medium Air only Set Point range 2 to 30 psi (13.8 to 207 kPa) Maximum pressure 30 psi (207 kPa) Repeatability ± 0.5 psi (3.4 kPa) Factory set point accuracy ± 2.0 psi (13.8 kPa) Scale accuracy ± 3.0 psi (20.7 kPa) Ambient temperature range 40 to 120°F (4.4 to 49°C) Position sensitivity - Can be mounted in any position; Maximum set point shift of -0,6 psi (4.
PAGE 3
SW 251 Pressure Electric Switches Technical Instructions Document Number 155-057P25 Rev. 1, May, 2000 Operation, continued SET POINT 1 ADJUSTMENT 2 7 3 4 6 ue SW0092R1 5 d POINT 'A' DIFFERENTIAL ADJUSTMENT (ONLY INCLUDED ON MODELS 251-0001 & 251-0011) tin Figure 1. Operational Schematic. on • Install instrument firmly in any position with the mounting tabs (included). AII wiring must conform to the National Electrical Code or local regulations.
PAGE 4
Technical Instructions Document Number 155-057P25 Rev. 1, May, 2000 Application SW 251 Pressure Electric Switches SingIe input models: SPDT - See Figure 2 N.O. - See Figure 3 N.C. - See Figure 4 DuaI Input Models -See Figure 5 N.C. CONTROL ALARM N.O. PNEUMATIC SIGNAL LINE d SW0083R1 COM. ue Figure 2. SPDT Model. N.C. TO ELECTRICAL EQUIPMENT N.O. PNEUMATIC SIGNAL tin SW0084R1 COM. Figure 3. Normally Open. on N.C. TO ELECTRICAL EQUIPMENT N.O. PNEUMATIC SIGNAL is c SW0085R1 COM.
PAGE 5
Technical Instructions Document Number 155-057P25 Rev. 1, May, 2000 SW0089R1 N.C. B N.C. Y N.O. R COM. B N.O. Y R COM. 3 N.C. N.O. COM. SW0090R1 SW0087R1 Wiring Diagrams SW0088R1 SW 251 Pressure Electric Switches Y N.O. R COM. 2 1 B N.C. R COM. S T Figure 6. Wiring Diagrams. d Dimensions 1 3/4 (45) 3 3/8 (86) SW0091R1 D is c on tin ue Dimensions in Inches (Millimeters) A NOTE: ON FIXED DIFFERENTIAL SWITCHES THE DIFFERENTIAL ADJUSTMENT BLOCK (A) IS OMITTED.
PAGE 6
Technical Instructions Document Number 155-057P25 Rev. 1, May, 2000 SW 251 Pressure Electric Switches Dimensions, Continued 2-13/16 (72) 2-5/16 (59) 3/4 (19) 3 9 15 21 27 8 12 18 24 30 1-3/8 (36) 3-15/32 (88) P.S.I. ue d SET POINT P.S.I. 6 2 tin SW0073R1 8 4 on Figure 8. All Single Input, Single Stage P.E. Switches - Front View. 4-5/8 (110) 3 9 15 21 27 8 12 18 24 30 3/4 (19) 3 9 15 21 27 8 12 18 24 30 P.S.I. P.S.I.