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   PART 1 - GENERAL

    01 WORK INCLUDED

    A. Contractor shall provide all labor, materials, tools, and services required for a complete working control system as described on the drawings and by the requirements of this section.

    02 SUBMITTALS

    A. Submit manufacturer's product data to Architect for approval in accordance with Section 15010.

    B. Provide complete schematic control diagrams, including sequences of control, operating ranges of system components, component setpoints, etc. to Architect for approval in accordance with Section 15010.

   PART 2 - PRODUCTS

    03 MANUFACTURERS

    A. Provide products as manufactured by Landis and Gyr Powers, Barber-Colman, or Andover.

    04 ELECTRONIC (DIRECT DIGITAL CONTROL) COMPONENTS

    A. Temperature Sensor:

    1. 1000 ohm thermistor (NIC) type with a high resistance change versus temperature change.

    2. Suitable for room, duct, or well mounting as required by application.

    3. Connect to remote controller by means of a two-wire unshielded cable.

    4. Room type to be with built-in setpoint potentiometer where required.

    5. Select sensor for temperature range of application.

    6. Provide appropriate mounting plate, hardware, and cast aluminum cover.

    B. Humidity Sensor:

    1. Solid state type utilizing cellulose acetate butyrate for the sensing element

    2. Output voltage to vary with change in relative humidity.

    3. Suitable for room or duct mounting.

    4. Connect to remote controller by means of three-wire unshielded cable.

    5. Room type to be equipped with built-in setpoint potentiometer where required.

    C. Duct Mounted Averaging Temperature Sensor:

    1. 1000 ohm Nickel resistance sensing element in a copper capillary of 27 feet length.

    2. Output voltage to vary with change in temperature.

    3. Connect to remote controller by means of a three-wire unshielded cable.

    D. Differential Pressure Sensor:

    1. 1000 ohm thermistor (NIC) type with a high resistance change versus temperature change.

    2. Suitable for outdoor or duct mounting.

    3. Connect to remote controller by means of a two-wire unshielded cable.

    E. Temperature/Humidity/Pressure Controllers:

    1. Plug-in proportional (proportional plus integral) type with integrated circuits.

    2. Capable of up to three separate outputs with separate zero and proportional band adjustments.

    3. Indicating lamps to display intensity of each output signal.

    4. Capable of 0-20 vdc proportional output, two position, or any combination.

    5. Internally switchable to either direct or reverse acting for each output.

    6. Provide an integral electronic circuit for absolute high or low limit control.

    7. Provide calibrated setpoint adjustment on face of controller.

    8. Compensation to provide linear reset of main sensor control point.

    F. Hot water Reset Controller:

    1. Solid state type utilizing integrated circuits.

    2. Integral reset action to eliminate sustained offset.

    3. Capable of receiving input signals from hot water and outdoor air sensors to control hot water supply temperature according to an adjustable reset schedule.

    4. Provide adjustable setpoints for absolute high and low limits for maintaining control point within rest range.

    5. Indicating lamp to display intensity of output signal.

    6. Provide proportional or three-point floating output as required by application.

    G. Chilled Water Reset Controller:

    1. Solid state type utilizing integrated circuits.

    2. Integral reset action to eliminate sustained offset.

    3. Capable of receiving input signals from chilled water and outdoor air sensors to control supply temperature according to an adjustable reset schedule.

    4. Adjustable setpoint for absolute high limit.

    5. Indicating lamp to display intensity of output signal.

    6. Provide proportional or three-point floating output as required by application.

    H. Fan Coil, Terminal Box, Zone Controller:

    1. Solid state type utilizing integrated circuits.

    2. Furnish with two separate outputs.

    3. Controller to receive signal from temperature sensor and vary its outputs according to the offset from its setpoint.

    4. Outputs to have an adjustable dead band to prevent overlap of heating and cooling.

    I. Rate/Reset Controller:

    1. Proportional type with adjustable integral and derivative actions.

    2. Field adjustable for either direct or reverse action.

    3. Furnish with a switch to eliminate the integral and derivative functions for calibration purposes.

    4. Controller output to be 0 to 20 vdc.

    5. Indicating lamp to display intensity of output signal.

    J. Constant Temperature Controller:

    1. Solid state type utilizing integrated circuits.

    2. Proportional type with integral reset action to eliminate sustained system offset.

    3. Furnish with switch for selecting long or short integral reset times.

    4. Indicating lamp to display intensity of output signal.

    K. Multi-Step Compressor Controller:

    1. Solid state type utilizing integrated circuits.

    2. Provide two or four step units as required for application.

    3. Provide cascaded units for applications requiring greater than four steps of control.

    4. Unit to control chilled water supply temperature as a function of return water temperature.

    5. Integral rate and reset action to eliminate system offset.

    L. Enthalpy Controller:

    1. Solid state type utilizing integrated circuits.

    2. Unit to compare total heat content of outside air, return air and cooling/dehumidification to select outside for free cooling.

    3. Indicating lamps to display air stream with higher enthalpy.

    4. Controller to be equipped with an adjustment for minimum/maximum outside air.

    M. Integral Sensor Controller:

    1. Solid state type utilizing integrated circuits.

    2. Internal thermistor (NIC) sensing element.

    3. Two separate outputs to be either 0 to 20 vdc proportional, two-position, or any combination.

    4. Each output to be field selectable for either direct or reverse action.

    5. Each output to have individual proportional band adjustments with dead band adjustment to prevent overlap of heating and cooling.

    6. Suitable for room or duct mounting.

    N. Step Controllers:

    1. Solid state type utilizing integrated circuits.

    2. Adjustable steps to be controlled by a 0 to 20 vdc input signal.

    3. Capable of controlling up to four steps in sequence with selected out/in points, differentials, and time delays.

    4. Provide multiple controllers in cascaded configuration where more than four stages of control are required.

    5. Indicating lamps to display active stages.

    O. Indicators:

    1. Dial type to interface with sensor controller to indicate measured values at sensor. Indicator to be capable of displaying temperature, pressure or humidity.

    2. Digital type to interface with sensor/controller to display measured values at sensor with seven segment display, 3 digits and sign.

    P. Alarm Units:

    1. Solid state type utilizing integrated circuits.

    2. Floating type to interface with controller to sense setpoint and measured value. Adjustable upper and lower alarm limits. Single or dual alarm unit.

    3. Stand alone type to connect to remote temperature or humidity sensor. Alarm outside of upper and lower limit setpoints. Single or dual alarm unit.

    Q. Transducers: (Electro/pneumatic)

    1. Pilot relay type capable of receiving 0 to 10 vdc or 4 to 20 ma dc signal.

    2. Producing a 3 to 15 psig proportional signal.

    3. Accuracy: (Plus or minus) 0.99 psi.

    4. Repeatability: .75% of span.

    5. Hysteresis: .75% of span.

    6. Linearity: 1.5% of span.

    7. 20 volt power supply.

    R. Rigid Galvanized Conduit:

    1. Provide and install rigid galvanized steel conduit, associated couplings, connectors, and fittings as manufactured by Thomas and Betts Corporation, or approved equal.

    2. Provide rigid conduit for branch circuits exposed below six feet.

    3. Provide rigid conduit for all wiring where routed in or through a return plenum, or through rated walls or partitions.

    2.02 ELECTRIC CONTROLS

    A. Firestats:

    1. Furnish with adjustable setting from 75 to 165 degrees F., insertion element, and manual reset button.

    2. U.L. labeled.

    3. Locate in the supply, return and exhaust ducts of each fan system below 2000 cfm and at other locations shown on the drawings.

    B. Smoke Detectors:

    1. Install duct mounted smoke detectors at locations indicated on the drawings. Smoke detectors to be furnished to the Mechanical Contractor by the Electrical Contractor. Detectors to be electrically connected by the Electrical Contractor.

    2. Sampling tubes to have minimum length of 3/4 of duct width. Locate sampling tubes a minimum of 6 duct widths downstream of any elbows or branch duct connections.

    C. Freezestats:

    1. Manual reset with 20 foot sensing element actuated by temperature on any one foot portion.

    2. U.L. approved.

    D. Time Clocks:

    1. Seven day, 24-hour, programmable with battery back-up.

    2. Capable of automatic switching of control system from day to night operation.

    3. Six hour override timer.

    2.03 CONTROL PANELS

    A. Control Panels:

    1. Control panels to be constructed of unitized cabinets.

    2. Provide cabinets of minimum dimensions 24" wide x 30" high x 8" deep with hinged, locking door opening to the front.

    3. Cabinets to be 12 gauge cold-rolled pickled steel with electrical knockouts on all four sides.

    4. Multiple panels mounted side-by-side to be hinged to the left.

    5. Start/stop switches, hand-off automatic switches, pilot lights, pneumatic switches, and temperature indicating devices specified to be panel mounted to be flush mounted in panel door.

    6. All other devices specified to be panel mounted to be internally mounted within panel.

    7. Panel locations to be approved by Owner/Engineer and be accessible for operation and maintenance.

    8. Local panels exposed to weather to be weatherproof construction.

    9. All devices specified to be mounted on temperature control panel that require electrical connections to be prewired to terminal strip located inside panel by Control Contractor.

    10. Wiring within unitized cabinet panel to conform to National Electric Code.

    2.04 DIRECT DIGITAL CONTROLLER

    A. Monitoring and control for the Direct Digital Control system will be performed by a microprocessor based Digital System Controller (DSC). The Digital System Controller will include monitoring and control of the HVAC system including all necessary energy functions, and electrical indication of all analog values, all binary inputs and status and manual control of all binary outputs. Each Digital System Controller will expand to two additional units with each having a minimum capability of four separate and independent process control loops.

    B. The Digital System Controller will perform its assigned monitoring and control functions as a stand-alone unit. Each DSC will include a communication network card. The system Controller will perform its full monitoring and control functions including energy management, regardless of the condition of communications link.

    C. Provide battery backup for volatile memory including real time clock for 24 hours. System Controller restart will be implemented on power restoration and include automatic recharging of battery.

    D. Power Line Surge Protection: Protect DSC power supply and input equipment to insure protection against overvoltage transients.

    E. Each Digital System Controller will include a local electronic indication for display of analog values, binary inputs, and status and manual control of all binary outputs. Additionally, a display panel will be visible from the front to indicate an associated trouble light, alarm indication and communications with the BAS.

    F. The associated keyboard will contain numerical keys to call up the desired point and type of value to be displayed along with several dedicated keys for function such as manual-auto, test, function and value enter.

    G. The Digital System Controller will have the ability to operate on a stand-alone basis. In the stand-alone mode, the DSC will be able to provide the capability to execute time programmed commands, duty cycling, analog override, local interlocking, and local control loops.

    H. Additionally, the DSC will contain in its program a self-test procedure for checking the indication lights, the digital display and, by means of a nondestructive memory, check the computer processing as well as communications between cards.

    I. All alarms (a fan that did not start, etc.) and all deviation alarms (temperature out of range, etc.) will light a red alarm light. Locally, an operator can initiate a scan and identify all alarm conditions and their identifiers on the local I/O.

    J. Modem interfacing peripherals within the DSC will conform to EIA RS232C standards.

    K. All data transmission between Digital System Controllers will consist of ASCII data strings.

    L. The DSC will be capable of performing all the energy management functions necessary to reduce energy consumption. These programs will include, but not be limited to:

    1. Supply air reset from specific load demands

    2. Economizer Control

    3. Optimal start using an adaptive algorithm to prevent the need for manual adjustment of parameters

    4. Chiller optimization controlling chilled water from specific load demands

    5. Client tailored programs. The library of routines available in firmware must be capable of generating additional programs as may be required for specific client requirements.

   PART 3 - EXECUTION

    05 INSTALLATION

    A. Components:

    1. Provide sensors, controllers, actuators, minimum leakage automatic dampers, damper motors of sufficient size and torque to operate dampers properly, modulating valves, damper control linkages, and related items necessary to accomplish control sequence shown on drawings. Install all such devices except as noted herein to the contrary.

    2. Deliver automatic valves to the job site to be installed by Mechanical Contractor under the supervision of Control Contractor.

    3. Deliver automatic dampers to job site to be installed by Mechanical Contractor under the supervision of Control Contractor.

    4. Prepare coordinated composite wiring diagram showing all interlock wiring associated with starters, control panels, chillers, hot water pumps, chilled water pumps, condenser water pumps, cooling tower fans, DX refrigeration compressors, electronic controls, and such other equipment as required.

    5. Drawings and layouts: The controls contractor shall provide to the mechanical contractor complete schematic drawings for the entire control system for submittal to the Owner for approval before work shall begin. Bulletins describing each item of control equipment or component shall be included.

    6. Provide sequence of operation written so that building engineer can read and understand control schemes.

    7. As-built drawings to be framed under plexiglass and placed in each respective equipment room area.

    B. Electrical:

    1. Electrical control components to be furnished to Electrical Contractor by Mechanical Contractor.

    2. Electrical Contractor to mount item where directed by Mechanical Contractor.

    3. Electrical Contractor to wire and connect controls complete and in working order in accordance with approved wiring diagrams.

    4. Control Contractor to furnish and install all low voltage wiring (120 volt and below), shielded and unshielded cable, sensor wire and rigid conduit.

    5. Control Contractor shall provide electrical interlock and control wiring (above 120 volt) to the Electrical Contractor for installation.

    3.02 QUALITY CONTROL

    A. Control system to be set up and checked out by factory trained competent technicians skilled in the setting and adjustment of temperature controls used in this project. This mechanic to be experienced in the type of systems associated with this control system.

    B. At time of final observation, Control Contractor to demonstrate the entire sequence of operation for all systems to the Engineer and/or Owner's Representative. At this time, Engineer to observe function of entire control system, observe temperature control operations, damper positions, necessary to assure that temperature control system is operating as intended by mechanical design.

    C. Final acceptance of system not to occur until sequence of operation check has taken place and certified by Engineer's and/or Owner's Representative.

    D. The Control Contractor is to be responsible for returning to job during the opposite season to verify operation of control systems. Engineer and/or Owner's Representative to be given notice of this return and to accompany Control Tradesman to observe the sequence of operation.

    E. Room Thermostats:

    1. Thermostats shall be provided with adjustable setting and covers in all non-public areas (patient rooms and staff occupied spaces).

    2. Thermostats in public areas (corridors, waiting rooms, lobbies, dining room, vending room) shall be blank front, key operated.

    3. Corridor area thermostats shall be mounted 60" above floor.

    4. Thermostats in operating rooms, cysto rooms, and delivery rooms shall be mounted 60" above the floor and coordinated and aligned with other devices.

    5. Other thermostats shall be mounted so that the top of the thermostat is 48" above the floor and aligned with the top of the light switch plates and 8" from the light switch if shown on the drawings adjacent to the light switch.

    6. Room thermostat locations shall be coordinated with door swings, light switches, and other wall mounted items.

    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