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Honeywell RP975 Pneumatic Hesitation Relay

Pneumatic Hesitation Relay
RP975

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.

• Manually adjustable minimum position. In-line, wall or panel mounted.
• Sharp-barb air connections.
• Molded plastic construction.

Select a link under the "item" tab below to order.

Cat #Descriptions
RP975A1003Pneumatic Three-Port Hesitation Relay
Type: Pneumatic Three-Port Hesitation relay
Dimensions, Approximate: 2 1/4 in. high x 2 1/2 in. wide x 3 3/4 in. deep (57 mm high x 63 mm wide x 96 mm deep)
Airflow Usage: 0.022 scfm (10 mL/s)
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
Knob Rotation: 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.
Operating Humidity Range: 5 to 95% RH
Temperature Range: 32 F to 125 F (0 C to 52 C)
Maximum Safe Operating Pressure: 30 psi (205 kPa)


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