Tunnel Transit Dampers - Greenheck

Actuators and
Leakage Data
Actuators
Greenheck has a variety of actuators available for the HTD series. The common models are:
RCS Sure series
• 120V or 230V, 50/60 Hz
• Spring Return, modulating or power
open/close
• NEMA-4, 4X and 7
RCS MAR series
• 24V, 120V, or 230V, 50/60 Hz
• NEMA-4 , 4X and 7
• Modulating or power open/close
Siemens 331-2856
• Pneumatic
• Two position, modulating
• Maximum 25 psi supply
Hytork XL681SRHT
• Pneumatic
• Two position, modulating
• Minimum 80 psi supply
RCS Sure 100
RCS MAR 90
Siemens
331-2856
Hytork XL681SRHT
Proximity Switch
A proximity brand switch is mounted to the damper axle to indicate blade position on the
damper. O-rings are used to seal the switch compartment for hazard, corrosion, and leakage
protection. This proximity switch is NEMA-4, 4X, and 7 rated and has been tested to a
temperature of 250°C for 2 hours of operation.
Leakage Data
Damper leakage (with blades fully closed) varies based on the type of low leakage seals applied. Leakage
testing was conducted in accordance with AMCA Standard 500-D and is expressed as CFM per sq. ft. of
damper face area. All data has been corrected to represent standard air at a density of .075 lb./ft 3 (1.2 kg/m 3 ).
HTD-630
Leakage (English version)
42 in. x 42 in. (1067mm x 1067mm) damper
HTD-630
Leakage (Metric version)
1067mm x 1067mm (42 in. x 42 in.) damper
4