Distech Controls PS-ADPS M Series

To Next Page

Hardware Ins t a l l a t i o n G u i d e

PS-ADPSXXXXM Series

Air Differential Pressure Switch, Metal Enclosure

Figure 1: PS-ADPSXXXXM Series Air Differential Pressure Switches

Product Description

This document describes the hardware installation procedures for the

PS-ADPSXXXXM Series Air Differential Pressure Switches.

These devices are general-purpose airflow-proving switches designed

for HVAC and energy management applications. It may be used to

sense positive, negative, or differential air pressure.

The PS-ADPSXXXXM Series plated housing contains a diaphragm, a

calibration spring and a snap-acting SPDT switch. The enclosure

cover, guards against accidental contact with the live switch terminal

screws and the set point adjusting screw.

General Installation Requirements

For proper installation and subsequent operation of each device, pay

special attention to the following recommendations:

- Upon unpacking the product, inspect the contents of the carton for

shipping damages. Do not install damaged device.

- Avoid areas where corroding, deteriorating or explosive vapors,

fumes or gases may be present.

- Ensure that all equipment is installed according to local, regional,

and national regulations.

Personal injury or loss of life may occur if you do not follow a

procedure as specified.

Equipment damage or loss of data may occur if you do not

follow a procedure as specified.

Take reasonable precautions to prevent electrostatic

discharges to the controller when installing, servicing or

operating the controller. Discharge accumulated static

electricity by touching one’s hand to a well-grounded object

before working with the controller.

Mounting Instructions

Select a mounting location which is free from vibration. The PS-

ADPSXXXXM Series pressure switch MUST be mounted with the

diaphragm in any vertical plane in order to obtain the lowest specified

operating set point. Avoid mounting with the sample line connections in

the “UP” position. Surface mount via the two 3/16” diameter holes in

the integral mounting bracket. The mounting holes are 3 7/8” apart.

Need help?

Do you have a question about the Distech Controls PS-ADPS M Series and is the answer not in the manual?

The PS-ADPSXXXXM Series Air Differential Pressure Switch, Metal Enclosure, is a general-purpose airflow-proving switch designed for HVAC and energy management applications. It can sense positive, negative, or differential air pressure.

Function Description:

The device operates by sensing air pressure differences. Its plated housing contains a diaphragm, a calibration spring, and a snap-acting SPDT switch. The enclosure cover protects the live switch terminal screws and the set point adjusting screw from accidental contact. The switch can be used to prove excessive or insufficient airflow or pressure, making it suitable for alarm or control applications.

Important Technical Specifications:

Adjustment Range:
- For models PS-ADPS12WCMAX/MAB: 0.05 ±0.02" w.c. to 12.0" w.c.
- For models PS-ADPS02WCMAX/MAB: 0.05 ±0.02" w.c. to 2.0" w.c.
- For models PS-ADPS12WCMMX/MMB: 0.4" ± 0.02" w.c. to 12.0" w.c.
Calibration:
- For PS-ADPS12WCMAX/MAB: Each full turn of the adjusting screw (after engaging the spring with 4 clockwise turns) represents approximately 1.2" w.c.
- For PS-ADPS02WCMAX/MAB: Each full turn represents approximately 0.2" w.c.
- For PS-ADPS12WCMMX/MMB: Each full turn represents approximately 1.16" w.c.
Mounting: Must be mounted with the diaphragm in any vertical plane to achieve the lowest specified operating set point. Avoid mounting with sample line connections in the "UP" position. Surface mounts via two 3/16" diameter holes in the integral mounting bracket, which are 3 7/8" apart.
Dimensions:
- Overall width: 3 1/4" (83 mm)
- Overall height: 6 1/8" (156 mm)
- Overall depth: 1 3/8" (35 mm)
- Mounting hole spacing: 3 7/8" (98 mm)

Usage Features:

Air Sampling Connection:
- PS-ADPS12WCMAX, PS-ADPS02WCMAX, and PS-ADPS12WCMMX models accept firm-wall sample lines of .25" OD tubing with ferrule and nut compression connections.
- PS-ADPS12WCMAB, PS-ADPS02WCMAB, and PS-ADPS12WCMMB models accept slip-on flexible lines of .25" OD tubing with adapters and barbed fittings.
- Recommended tubing sizes:
  - Up to 10 feet: .25" OD tubing
  - Up to 20 feet: .25" ID tubing
  - Up to 60 feet: .5" ID tubing
Sampling Probe Placement:
- Locate the sampling probe a minimum of 1.5 duct diameters downstream from the air source.
- Install the sampling probe as close to the center of the airstream as possible.
Pressure Inlet Identification: High pressure inlet (H) and low pressure inlet (L) are clearly identified.
Application Options for Sample Line Connection:
- Positive Pressure Only: Connect sample line to inlet H; inlet L remains open to the atmosphere.
- Negative Pressure Only: Connect sample line to inlet L; inlet H remains open to the atmosphere.
- Two Negative Samples: Connect the higher negative sample to inlet L; connect the lower negative sample to inlet H.
- Two Positive Samples: Connect the higher positive sample to inlet H; connect the lower positive sample to inlet L.
- One Positive and One Negative Sample: Connect the positive sample to inlet H; connect the negative sample to inlet L.
Wiring Diagram: Provides clear instructions for connecting the device for alarm or control, showing NO (Normally Open), C (Common), and NC (Normally Closed) terminals for both excessive and insufficient airflow/pressure scenarios.

Maintenance Features:

Installation Inspection: Upon unpacking, inspect the carton contents for shipping damages. Do not install a damaged device.
Environmental Considerations: Avoid areas with corroding, deteriorating, or explosive vapors, fumes, or gases.
Calibration: A digital manometer or other measuring device should be used to confirm the actual set point during calibration.
Electrostatic Discharge Precautions: Take reasonable precautions to prevent electrostatic discharges to the controller when installing, servicing, or operating. Discharge accumulated static electricity by touching a well-grounded object before working with the controller.
Vibration-Free Mounting: Select a mounting location free from vibration to ensure proper operation.
Regulatory Compliance: Ensure all equipment is installed according to local, regional, and national regulations.