Greenheck 332-2856 User Manual

PNEUMATIC RELIEF VALVE

(PRV)

Pneumatic Temperature Response Device

Application

The Pneumatic Relief Valve (PRV) is a heat responsive device used in conjunction with Greenheck fire/smoke dampers. An alternative to the PRV would be an RRL with an EP (electric/pneumatic) switch. The PRV activates when temperatures in excess of 165°F (74°C) or 212°F (100°C) are detected. When the fuse link melts, air from the actuator is exhausted to close the damper. Pneumatic actuators are to be piped per local codes. The PRV must be installed at the factory and cannot be added in the field.

Required Air Pressure

Actuator Model

Air Pressure

331-4551 331-2976, MK2-7121 332-4551, 332-2856 PSI 332-2956

*Specific to damper and actuator size

Required

20 or 25*

Figure 1

Fusible Link

Damper

4 in. x 4 in. J-Box

Sleeve

PRV Unit

Supply (Barbed fitting)

Sleeve

Damper

To Actuator

(Compression fitting piped at factory)

PRV Supplement Rev 6 May 2007