Control Dampers Technical Requirements for Integrated Automation System

This article is about general and technical requirements for Control Dampers used in Integrated Automation System or Building Automation System.

Control Dampers Technical Requirements for Integrated Automation System

Control dampers <Modify as required to match project design, delete sections that are not relevant>

• General: Provide factory fabricated automatic control dampers of sizes, velocity and pressure classes as required for smooth, stable, and controllable airflow. Provide parallel or opposed blade dampers as recommended by manufacturer’s sizing techniques.  For dampers located near fan outlets, provide dampers rated for fan outlet velocity and close-off pressure, and recommended by damper manufacturer for fan discharge damper service.  <Control dampers used for smoke dampers shall comply with UL 555S.  Control Dampers used for fire dampers shall comply with UL 555.>
• For general isolation and modulating control service in rectangular ducts at velocities not greater than 1500 fpm (7.62 m/s), differential pressure not greater than 2.5 inches w.c. (622 Pa):
  1. Performance: Test in accordance with AMCA 500.
  2. Frames: Galvanized steel, 16-gage minimum thickness, welded or riveted with corner reinforcement.
  3. Blades: Stainless steel in lab exhausts and galvanized steel elsewhere, maximum blade size 8 inches (200 mm) wide by 48 inches (1219 mm) long, attached to minimum 1/2 inch (12.7 mm) shafts with set screws, 16 gage minimum thickness.
  4. Blade Seals: Synthetic elastomer, mechanically attached, field replaceable.
  5. Jamb Seals: Stainless steel.
  6. Shaft Bearings: Oil impregnated sintered bronze, graphite impregnated nylon sleeve or other molded synthetic sleeve, with thrust washers at bearings.
  7. Linkage: Concealed in frame.
  8. Linkage Bearings: Oil impregnated sintered bronze or graphite impregnated nylon.
  9. Leakage: Less than one percent based on approach velocity of 1500 fpm (7.62 m/s) and 1 inches wg. (249Pa).
  10. Maximum Pressure Differential: 5 inches wg. (622 Pa).
  11. Temperature Limits: -40 to 200 degrees F (-40 to 93 degrees C).
  12. Where opening size is larger than 48 inches (1219 mm) wide or 72 inches (1829 mm) high, provide dampers in multiple sections, with intermediate frames and jackshafts appropriate for installation.
• For general isolation and modulating control service in rectangular ducts at velocities not greater than 4000 fpm (20.3 m/s), differential pressure not greater than 6 inches w.c. (1493 Pa):
  1. Performance: Test in accordance with AMCA 500.
  2. Frames: Galvanized steel, 16-gage minimum thickness, welded or riveted with corner reinforcement.
  3. Blades: Extruded aluminum hollow airfoil shape, maximum blade size 8 inches (200 mm) wide by 48 inches (1219 mm) long, attached to minimum 1/2 inch (12.7 mm) shafts, 14 gage minimum extrusion thickness.
  4. Blade Seals: Synthetic elastomeric, mechanically attached, field replaceable.
  5. Jamb Seals: Stainless steel.
  6. Shaft Bearings: Oil impregnated sintered bronze sleeve, graphite impregnated nylon sleeve, molded synthetic sleeve, or stainless steel sleeve, with thrust washers at bearings.
  7. Linkage: Concealed in frame.
  8. Linkage Bearings: Oil impregnated sintered bronze or graphite impregnated nylon.
  9. Leakage: Less than 0.1 percent based on approach velocity of 4000 fpm. (20.3 m/s) and 1 inches wg. (249Pa).
  10. Maximum Pressure Differential: 6 inches wg. (622 Pa).
  11. Temperature Limits: -40 to 200 degrees F (-40 to 93 degrees C).
  12. Where opening size is larger than 48 inches (1219 mm) wide or 72 inches (1829 mm) high, provide dampers in multiple sections, with intermediate frames and jackshafts appropriate for the installation.
• For general isolation and modulating control service in rectangular ducts at velocities not greater than 4000 fpm, differential pressure not greater than 12 inches w.c.:
  1. Performance: Test in accordance with AMCA 500.
  2. Frames: Galvanized steel, 12-gage minimum thickness, welded or riveted with corner reinforcement.
  3. Blades: Extruded aluminum hollow airfoil shape, maximum blade size 8 inches (200 mm) wide by 48 inches (1219 mm) long, attached to minimum 3/4 inch (19 mm) shafts with set screws.
  4. Shaft Bearings: Oil impregnated sintered bronze or stainless steel, pressed into frame, with thrust washers at bearings.
  5. Linkage: 10-gage minimum thickness galvanized steel clevis type crank arms, 3/16 inch x ¾ inch (4.76 mm x 19 mm) minimum thickness tie rods.
  6. Linkage Bearings: Oil impregnated sintered bronze or graphite impregnated nylon.
  7. Leakage: Less than 0.2 percent based on approach velocity of 4000 fpm (20.3 m/s) and 1 inches wg. (249Pa) differential pressure.
  8. Maximum Pressure Differential: 12 inches wg. (2984 Pa).
  9. Temperature Limits: -40 to 300 degrees F (-40 to 149 degrees C).
  10. Where opening size is larger than 48 inches (1219 mm) wide or 72 inches (1829 mm) high, provide dampers in multiple sections, with intermediate frames and jackshafts appropriate for the installation.
• For general isolation and modulating control service in round ducts up to 40 inches in size at velocities not greater than 2500 fpm (12.7 m/s), differential pressure not greater than 4 inches w.c. (994 Pa):
  1. Performance: Test in accordance with AMCA 500.
  2. Frames: Rolled 12 gage steel strip for sizes 6 inch and smaller, rolled 14 gage steel channel for larger sizes, galvanized or aluminum finish.
  3. Blades: Steel construction, 12 gage minimum thickness for dampers less than 18 inches (457 mm) in size, 10 gage minimum thickness for larger dampers.
  4. Blade Seals: Full circumference neoprene.
  5. Shaft: ½ inch (12.7 mm) diameter zinc or cadmium plated steel.
  6. Shaft Bearings: Oil impregnated sintered bronze or stainless steel, pressed into frame, with thrust washers at bearings.
  7. Leakage: Less than 0.2 percent based on approach velocity of 4000 fpm (20.3 m/s) and 1 inches wg. (249Pa) differential pressure.
  8. Maximum Pressure Differential: 4 inches wg. (994 Pa).
  9. Temperature Limits: -40 to 300 degrees F (-40 to 149 degrees C).
• For general isolation and modulating control service in round ducts up to 60 inches in size at velocities not greater than 4000 fpm (20.3 m/s), differential pressure not greater than 6 inches w.c. (1492 Pa):
  1. Performance: Test in accordance with AMCA 500.
  2. Frames: Rolled 10-gage steel channel for sizes 48 inch and smaller, rolled 3/16 inch (4.76 mm) thick steel channel for larger sizes, galvanized or aluminum finish.
  3. Blades: Steel construction, 10-gage minimum thickness for dampers not greater than 48 inches in size, ¼ inch (6.35 mm) minimum thickness for larger dampers.
  4. Blade stops: ½ inch x ¼ inch (12.7 mm x 6.35 mm) full circumference steel bar.
  5. Blade Seals: Full circumference neoprene.
  6. Shaft: Zinc or cadmium plated steel, angle reinforcing as necessary.
  7. Shaft Bearings: Oil impregnated sintered bronze or stainless steel, pressed into frame, with thrust washers at bearings.
  8. Leakage: Less than 0.4 percent based on approach velocity of 4000 fpm (20.3 m/s) and 1 inches wg. (249Pa) differential pressure.
  9. Maximum Pressure Differential: 6 inches wg. (1492 Pa).
  10. Temperature Limits: -40 to 250 degrees F (-40 to 121 degrees C).