Commercial Building Controls : Pneumatic Products : Pneumatic Relays : RP975 : RP975A1003/U
Pneumatic Three-Port Hesitation Relay
Overview
A three-port hesitation relay provides minimum outside air damper position plus controlled ventilation for large volume unit ventilators. Replacement devices are available for Johnson, Powers, and Barber-Colman devices.
Features
- Manually adjustable minimum position. In-line, wall or panel mounted.
- Sharp-barb air connections.
- Molded plastic construction.
Product Specifications
- Application
- Pneumatic Three-Port Hesitation relay
- Airflow Usage
- 0.022 scfm (10 mL/s)
- Dimensions (in.)
- 2 1/4 in. high x 2 1/2 in. wide x 3 3/4 in. deep
- Dimensions (mm)
- 57 mm high x 63 mm wide x 96 mm deep
- Maximum Safe Operating Pressure (psi)
- 30 psi, maximum
- Maximum Safe Operating Pressure (kPa)
- 205 kPa, maximum
- Temperature Range (F)
- 32 F to 125 F
- Temperature Range (C)
- 0 C to 52 C
- Includes
- 14003030-001, 1 1/2 in. Mounting Clip for mounting relay to wall or panel. Also includes scaleplate and knob, factory mounted and calibrated. Use with MP909 or MP918 Damper Actuator having a 7 to 13 psi (50 to 90 kPa) spring range
- Comments
- Knob has two (2) internal breakaway stops that limit rotation to 188 degrees. Each stop, when removed, adds 56 degrees of rotation. Maximum rotation is 300 degrees.
- Mounting
- Wall or In-line or panel
- Operating Humidity Range (% RH)
- 5 to 95% RH
- Air connections
- Barb fittings 5/32 in. (4 mm) O.D. plastic tubing
- Capacity
- 0.003 scfm (1.65 mL/s)
- Operation
- Provides minimum outside air damper position
