The A30 Series of pressure switches offers the   same proven compression spring and precision   snap action electrical switch as the other popular   and widely used pressure switches.The A30 Series is designed as compact body,   which specially meets the current small size  appliances.The A30 Series is designed specifically to yield   narrow pressure differentials (the difference   between ON and OFF set points) as well as to   hold tight set point tolerances throughout a wide   temperature range.condensate drain blockage and fluid build up;   draft inducer verification; proving fan operation;   proving a blocked filter with change in differential   pressure; monitoring static pressure; sensing   increase/decrease in system pressure; proving air   across heating elements; detecting ice buildup in   cooling coils; managing air in VAV systems;   detecting web breaks on printing, coating or other   web processes.   

FEATURES

Low pressure sensitivity.

Set point range from 25Pa (0.10 wc) to   1250Pa (5.0" wc)  

Pressure differentials offer three types of 15   Pa, 25 Pa, and 35 Pa for selection (other   pressure differential on customers'   demands).   

Integrated sampling line connectors for 1/4"   inside diameter (ID) tubing.

Sampling line connectors can be positioned   by 45 degrees increments.

Integrated screw bosses for mounting.

Separated precision snap action switch is the   electrical switching element.

Integrated bleed holes.

SPECIFICATIONS

Electrical Ratings:   SPDT, SPST electrical loads:   1(0.5)A @ 125/250 VAC -- (CE)   5 A resistive @ 125/250 VAC -- (UL)   0.1A resistive @ 24 VDC (Gold contacts)

Switching circuits: SPDT, SPST-NO, SPST-NC

Electrical terminals:   #187 (3/16") 4.8x0.5 mm quick connect   #250 (1/4") 6.3x0.8 mm quick connect

Set points Tolerance: +/-5 Pa min., +/-8 Pa   standard.  

Ambient temperature range: -25℃ to + 85℃.

Sampling line connector:   H(+) = Positive, L(-) = Negative   6.6 mm OD for use with 3/16" or 1/4" ID tubing;   other size OD on customers demands.

Sampling Medium: Air or combusted products.

Dimensions: For typical dimensions, see   "DIMENSIONAL DRAWING" shown as below

Mounting Orientation: Diaphragm must be   vertical (Horizontal optional).

Materials:   Diaphragm: Post-cured silicone, RTI>150 deg C.   Pressure housing: Thermo-plastics with RTI>110   deg C, UL94-V1.   Snap action switch housing: Thermo-plastics with RTI>120 deg C, UL94-V0.

Product Life:   Mechanical: 1,000,000 cycles.   Electrical: 250,000 cycles.

Approvals:   Snap action switch approved by:   - Underwriters Laboratories Inc. (UL)   - China Quality Certification Center (CQC)

INSTALLATION

1. Read these instructions carefully. Failure to   follow them could damage the device or   cause a hazardous condition. This control   must be installed in accordance with the rules in force.

2.  Check ratings and descriptions given in the   specifications and /or the product drawing to   make sure the device is suitable for your   application.   

3.  Installer must be a trained, experienced   service technician.

4.  After installation is completed, check out   device operation as provided in the   instructions.   

   WARNING!

   Electrical shock hazard or explosion   hazard can cause severe injury, death   or property damage.

   1. Disconnect power before installation. More   than one disconnect may be involved.

   2. Turn off all fuel sources before installation.

   3. Follow all installation and checkout   procedures for safe installation.

   
   

   DIMENSIONAL DRAWING