Micro Piles  |  Pressure Grouting  |  Rock Anchors  |  Permeation Grouting   |  Micropile
Soil Nailing  |  Compaction Grouting  |  Micropiles  |  Chemical Grouting   |  Soil Nail Wall

   PART 1 - GENERAL

    01 WORK INCLUDED

    A. Provide air handling units of the size, type and configuration as scheduled and shown on drawings.

    02 QUALITY ASSURANCE

    A. Certify unit components in accordance with ARI Standard 430 as applicable.

    B. Certify coils in accordance with ARI Standard 410. Substantiate performance by ARI computer generated output.

    C. ASHRAE Compliance: Construct and install refrigerant coils in accordance with ASHRAE 15 "Safety Code for Mechanical Refrigeration".

    D. NFPA Compliance: Provide air handling unit internal insulation having flame spread rating not over 25 and smoke developed rating no higher than 50; and complying with NFPA 90A "Standard for the Installation of Air Conditioning and Ventilating Systems".

    E. UL and NEMA Compliance: Provide electrical components required as part of air handling units, which have been listed and labeled by UL and comply with NEMA Standards.

    F. NEC Compliance: Comply with National Electrical Code (NFPA 70) as applicable to installation and electrical connections of ancillary electrical components of air handling units.

    03 SUBMITTALS

    A. Submit products to Architect for approval as required by Section 15010.

   PART 2 - PRODUCTS

    04 GENERAL

    A. Provide factory assembled sections to include fan section, coil section, filter section and accessory items as described on drawings or herein.

    05 CASING

    A. Provide units of sectionalized cabinet construction. Fabricate sheet metal parts of continuous heavy gauge galvanized steel etched in acid and coated with air dried phenolic (Heresite). Provide reinforcing and bracing required for maximum rigidity. Panels shall be removable for access.

    06 BLOWER SECTION

    A. Provide DWDI fan with galvanized steel etched in acid and coated with air dried phenolic (Heresite) scroll housing.

    B. Provide air foil, forward curve, or backward inclined fan wheel as scheduled, or as required by performance specifications. Statically and dynamically balance fan before and after installation in the cabinet section.

    C. Provide fan shaft keyed, set screwed or clamped to the wheel per the manufacturers standard design to meet the specified performance. Maximum fan rpm to be well below the first critical speed.

    D. Provide units with internally or externally mounted fan motors. Locate motors on factory slide rail base complete with adjustment nuts. Provide access to fans and internally mounted motors and all bearings. Units with internally mounted motors to have additional capacity to compensate for motor heat.

    E. Provide fan bearings of the ball, roller, or pillow block type, self-aligning and grease lubricated. Provide extended lubrication lines from fan bearing to unit casing. Connect lubrication lines to a Zerk fitting mounted on the casing. Select bearings for an average life of 200,000 hours at design operating conditions.

    F. Insulate fan section with 1" thick, neoprene coated, fiberglass, 1-1/2 pound density applied to internal surfaces with adhesive (100% coverage) and secured with weld pins, one for each 2 square foot of surface. Coat exposed edges of insulation with adhesive. Insulation and adhesive to meet NFPA-90A standards.

    G. Insulate divider plate between hot and cold deck.

    H. Provide view port in cabinet for observation of inlet guide vanes.

    07 COIL SECTION

    A. Fabricate casings of continuous galvanized steel etched in acid and coated with air dried phenolic (Heresite).

    B. Provide double constructed drain pan consisting of 1/2" urethane insulation covered with a sheet metal liner and mastic coating. Drain pan shall extend under both coil and fan sections.

    C. Completely enclose coil headers within the insulated casing with connections extended through cabinet.

    D. Insulate coil sections identically to fan section.

    08 HEATING COILS - HOT WATER

    A. Provide 1/2" or 5/8" outside diameter tubing with aluminum fins. Bond fins by mechanical expansion.

    B. Provide coils with a maximum working pressure of 175 psig at 400 degrees F.

    C. Test coils with air pressure of 350 psig submerged in water.

    09 FILTER SECTION

    A. Furnish factory built flat, medium capacity (v-arrangement), high capacity (z-arrangement) or high efficiency filter section complete with filters as specified herein. Filter area to be specified on unit schedule. Filter sections to have access doors on both ends. Refer to Section 15886 for filter specifications.

    010 INLET VANES

    A. Provide variable inlet vanes for air foil or forward curve fan units, as scheduled on drawings, of the vane type, nested, suitable for shutoff pressures to 12" water gauge and temperatures to 200 degrees F., with vane shafts connected to control ring by crank arms integrated within inlet bell.

    B. Operate both vanes by a lever on fan scroll with connecting shaft between inlets.

    C. Operator to be selected for torque required to move inlet vanes under all load conditions.

    D. Operator to be industrial quality with positive positioning relay and capable of stroking inlet vanes from 0 to 100% open over control pressure range.

    E. Factory mount, operate and test for proper operation.

    011 MANUFACTURERS

    A. Central station air handling units shall be manufactured by Carrier, McQuay or Trane.

   PART 3 - EXECUTION

    012 INSTALLATION

    A. Install each unit on a level, rigid and heavy concrete base.

    B. Mount each unit by spring or isolators (minimum 1-1/2" deflection) as set forth in the drawings to prevent transmission of vibration to the building and surrounding structure. Coordinate the selection of the isolators with manufacturer of the air handling units to assure compatibility of mounting details. Refer to other Division 15 sections for vibration isolation specification.

    C. Unit(s) mounted on inertia bases to require no vibration isolation by unit manufacturer.

    D. Provide clearance at each unit for routine service including the changing of filters, removal of coils, bearing greasing, opening of access doors, pulling of blower shaft and removal of motors.

    E. Ductwork: Duct connectors to each unit to allow for straight and smooth air flow. No turns are to be installed at the fan discharge which are in the opposite direction to fan wheel rotation.

    F. Provide flexible connections at duct connections to unit.

    G. Piping:

    1. Support piping independently of coils and with adequate flexibility to prevent undue stress at coil header connections.

    2. Install full size drain lines from the drain pan connection and include trap to permit condensate to drain freely.

    3. Install service valves on both supply and return lines to coils and install so valves can be shut off, a small section of pipe removed, and coil allowed to slide out. This condition applies to water and steam coils only.

    4. Submittal data for multizone units to contain zoning damper arrangements for zones indicated on drawings. Indicate CFM for each section.

    5. Indicate zone served by area, i.e., Dining Room - Zone 3, on all zone damper motors on multizone units.

    3.02 START-UP, TESTING, TRAINING

    A. Start-up unit, check for proper performance, motor rotation, air leakage, or infiltration, etc.

    B. Prepare unit for test and balance as required under Section 15030.

    C. Correct deficiencies found by Test and Balance Contractor.

    D. Demonstrate and instruct hospital engineering personnel in the operation of the system.

    END OF SECTION

Rembco Geotechnical Contractors specializes in slope stabilization, foundation repair and support, shoring, grouting, soil nails, micropile installations, and sinkholes. We are experienced in these applications: micro piles, sinkhole repair, permeation grouting, pressure grouting, soil nails, chemical grouting, micropiles, compaction grout, rock anchors and compaction piles. Our specialties are rock anchor, chemical and compaction grouting, mini piles, sinkhole repair, micropiles, and soil nailing. We use a problem-solving approach in the geotechnical portions of buildings, bridges, water plants, sewage plants, tunnels, sinkholes, caisson, and roads. Rembco techniques apply when adding new real estate structures: especially rock anchor, microfine grouting, soil nailing, micropile installations for foundation support. Add URL Construction, Drilling and Concrete