Dwyer CXA User Manual

Bulletin IN-525A

Series CXA Water Pump Pressure Switch

Specifications - Installation and Operating Instructions

The Series CXA Water Pump Pressure Switches have been

proven reliable for controlling automatic water systems. These switches are very popular for use on water well pumps and pumping systems. The set point and deadband are both easily adjustable via screws inside the cover. For ease of installation, the switches come with a 1/4˝ female NPT process connection and can be mounted in any orientation. The series CXA’s simple design makes it a great switch for an installer at any skill level.

MODELS

Approx.

Model Number CXA-S1 CXA-S2 CXA-S3 CXA-R1 CXA-R2 CXA-R3

Switch

Type

NC NC NC NO NO NO

Range

psig (bar)

15-80 (1.0-5.5)

30-100 (2.1-6.9)

35-150 (2.4-10.3)

15-80 (1.0-5.5)

30-100 (2.1-6.9)

35-150 (2.4-10.3)

Adjustable Deadband

psig (bar)

15-30 (1.0-2.1) 20-35 (1.4-2.4) 30-40 (2.1-2.8) 15-30 (1.0-2.1) 20-35 (1.4-2.4) 30-40 (2.1-2.8)

Max. Pressure psig (bar)

129 (8.9) 179 (12.3) 204 (14.1)

2-17/64

(57.6)

3-45/64

(94)

3-3/8

(85.5)

2-9/16

(65)

SPECIFICATIONS Service: Compatible liquids and gases. Wetted Materials: Silicone, steel, and SS. Temperature Limits: 140°F (60°C). Pressure Limits: See model chart. Enclosure Rating: General purpose. Repeatability: ±5 psig (±0.3 bar). Switch Type: SPST snap action (see model chart). Electrical Ratings: 20A @ 120 VAC, 12A @ 240 VAC, 9.6A @

240 VAC (3 phase), 8.6A @ 32 VDC, 3.1A @ 120 VDC, 1.6A @ 240 VDC.

Electrical Connections: Screw terminal. Conduit Connection: 7/8˝ hole for 1/2˝ conduit hub (2 places). Process Connection: 1/4˝ female NPT. Mounting Orientation: Switch can be installed in any position. Setpoint Adjustment: Internal screws. Weight: 0.75 lb (0.34 kg). Deadband: See model chart. Agency Approvals: CE, UL pending.

INSTALLATION/MOUNTING

The switch can be pipe mounted in any position. Do not twist the case when installing. Use a wrench on the pressure connection

CAUTION: No lubrication or periodic servicing is required. Mount the control securely. Never exceed the electrical rating for the switch. Use the control only with compatible medias.

flats.

WIRING

All wiring must conform to the National Electrical Code and local regulations. Do not install the control to handle loads in excess of electrical rating shown in specifications or as indicated on instructions inside control cover.

TURN

CLOCKWISE

TO INCREASE

BOTH CUT-OUT

AND CUT-IN

PRESSURE

MOTOR

WIRING DIAGRAM

LINE

POWER SUPPLY

TURN CLOCKWISE TO INCREASE CUT-OUT PRESSURE WITHOUT AFFECTING CUT-IN

MAINTENANCE

Upon final installation of the Series CXA Water Pump Pressure Switch, no routine maintenance is required. A periodic check of the system calibration is recommended. The Series CXA is not field serviceable and should be returned if repair is needed (field repair should not be attempted and may void warranty). Be sure to include a brief description of the problem plus any relevant application notes. Contact customer service to receive a return good authorization number before shipping.

MERCOID DIVISION

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com Fax: 219/872-9057 e-mail: info@dwyer-inst.com

P.O. BOX 258 • MICHIGAN CITY, INDIANA 46361 U.S.A.