DESIGN A/E NOTE - GUIDE SPECIFICATION CONVENTIONS

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Rev 19JUN09 j:\Projects\Active\com-deca_design_criteria_revisions-04071\Guide Specifications\TJG Innformation

SECTION 15790

AIR COILS

PART 1 - GENERAL

1.1SUMMARY

1.1.1.Section Includes:

  1. [Water] [Glycol solution] coils.
  2. Refrigerant coils.
  3. Electric coils.

1.1.2.Related Sections:

  1. Section 01042 - Mechanical, Refrigeration, Food Service Equipment and Electrical Coordination.
  2. Section 01400 - Quality Control.
  3. Section 01720 – [Phased Turnover and] Contract Closeout.
  4. Section 15260 Piping Insulation for HVAC and Plumbing.
  5. Section 15515 Hydronic Specialties.
  6. Section 15890 Ductwork: Installation of duct coils.
  7. Division 16 - Electrical.

1.2QUALITY CONTROL

1.2.1.The following publications form a part of this specification to the extent they are applicable:

  1. Section 01400 – Quality Control.
  2. ARI 410 ForcedCirculation AirCooling and Air Heating Coils.
  3. SMACNA HVAC Duct Construction Standards, Metal and Flexible.
  4. NFPA 70 National Electrical Code.

1.3SUBMITTALS FOR REVIEW

  1. Section 01300 - Submittals: Procedures for submittals.
  2. Product Data: Provide coil and frame configurations, dimensions, materials, rows, connections, and roughin dimensions.
  3. Shop Drawings: Indicate coil and frame configurations, dimensions, capacities, materials, rows, connections, and roughin dimensions.
  4. Operation and Maintenance data.

1.4QUALITY ASSURANCE

  1. Manufacturer Qualifications: Company specializing in manufacturing the Products specified in this section with minimum three years experience.

1.5REGULATORY REQUIREMENTS

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  1. Products Requiring Electrical Connection: Listed and classified by Underwriters Laboratories Inc. as suitable for the purpose specified and indicated.

1.6DELIVERY, STORAGE, AND HANDLING

  1. Protect coil fins from crushing and bending by leaving in shipping cases until installation, and by storing indoors.
  2. Protect coils from entry of dirt and debris with pipe caps or plugs.

PART 2 - PRODUCTS

2.1[WATER] [GLYCOL SOLUTION] [HEATING] [COOLING] COILS

  1. Tubes: 5/8 inch (16 mm) OD seamless copper arranged in parallel or staggered pattern, expanded into fins, silver brazed joints.
  2. Fins: Aluminum continuous plate type with full fin collars.
  3. Casing: Die formed channel frame of 16 gage (1.6 mm) galvanized steel. Provide tube supports for coils longer than 48 inches (1200 mm).
  4. Headers: Cast iron with tubes expanded into header or Seamless copper tube with silver brazed joints.
  5. Testing: Air test under water to 200 psig (1380 kPa) for working pressure of 200 psig (1380 kPa) and 220 degrees F (104 degrees C).
  6. Configuration: Drainable, with threaded plugs in headers for drain and vent.

2.2REFRIGERANT COILS

  1. Tubes: 3/8, ½, or 5/8 inch (16 mm) OD seamless copper or brass arranged in parallel or staggered pattern, expanded into fins, brazed joints.
  2. Fins: [Aluminum] [copper] continuous plate type with full fin collars.
  3. Casing: Die formed channel frame of 16 gage (1.6 mm) galvanized steel. Provide tube supports for coils longer than 36 inches (900 mm).
  4. Headers: Seamless copper or brass tubes with silver brazed joints.
  5. Liquid Distributors: Brass or copper venturi type distributor with seamless copper distributor tubes, 5/16 inch (7.9 mm) OD for refrigerant R12 and 1/4 inch (6.4 mm) OD for refrigerant R22; maximum 12 circuits per distributor.
  6. Testing: Air test under water at 300 psig (2070 kPa) for working pressure of 250 psig (1720 kPa); clean, dehydrate, and seal with dry nitrogen charge.
  7. Fin Spacing: 14 fins per inch (1.8 mm on center).

2.3ELECTRIC COILS

  1. Assembly: ANSI/UL 1096 listed and labeled, with terminal control box and [hinged] cover, splice box, coil, casing, and controls.
  2. Coil: Enclosed copper tube, aluminum finned element of coiled nickelchrome resistance wire centered in tubes and embedded in refractory material or Exposed helical coil of nickelchrome resistance wire with refractory ceramic support bushings as scheduled.
  3. Casing: Die formed channel frame of 18 gagegalvanized steel with. Provide tube supports for coils longer than 36 inches.
  4. Controls: Automatic reset thermal cutout, builtin magnetic, control circuit transformer and fuse, manual reset thermal cutout, air flow proving device, unfused disconnect, load fuses.

PART 3 - EXECUTION

3.1INSTALLATION

  1. Install in accordance with manufacturers written instructions.
  2. Install in ducts and casings in accordance with SMACNA HVAC Duct Construction Standards, Metal and Flexible.

(1)Support coil sections independent of piping on steel channel or double angle frames and secure to casings.

(2)Provide frames for maximum three coil sections.

(3)Arrange supports to avoid piercing drain pans.

(4)Provide airtight seal between coil and duct or casing.

(5)Refer to Section 15890.

  1. Protect coils to prevent damage to fins and flanges. Comb out bent fins.
  2. Install coils level. Install cleanable tube coils with 1:50 pitch.
  3. Make connections to coils with unions and flanges.
  4. Hydronic Coils:

(1)Hydronic Coils: Connect water supply to leaving air side of coil (counterflow arrangement).

(2)Provide shutoff valve on supply line and balancing valve with memory stop on return line.

(3)Locate water supply at bottom of supply header and return water connection at top.

(4)Provide manual air vents at high points complete with stop valve.

(5)Ensure water coils are drainable and provide drain connection at low points.

(6)Refer to Section 15515.

(7)For cooling coils where air velocity exceeds 500 ft/min. provide [three break] [six break] moisture eliminators of galvanized steel.

(8)Provide drain pan and drain connection for cooling coils. Fabricate drain pan from 20 gage galvanized steel. Extend 3 inches from face of coil entering air side 6 inches from face of coil leaving air side [,] [.] and 4 inches from face of eliminators. Pipe drain pans individually to floor drain[.] [with water seal trap.]

  1. Wire electric duct coils in accordance with ANSI/NFPA 70. .
  2. Refrigerant Coils: Provide sight glass in liquid line within 12 inches (300 mm) of coil. Refer to Section 15535.
  3. Insulate headers located outside air flow as specified for piping. Refer to Section 15260.

END OF SECTION

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