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T&C

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Testing and Commissioning
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  SECTION 01811MECHANICAL EQUIPMENT COMMISSIONINGPART 1 - GENERAL1.1RELATED WORKA.Section 01810Fundamental Commissioning Requirements1.2RESPONSIBILITIESA.Division 15: Mechanical. Contractors shall participate in the Commissioning process as a commissioning team member as described in Section 01810 Fundamental Commissioning Requirements. B.Division 2: Irrigation subcontractors shall participate in the Commissioning process as a commissioning team member as described in Section 01810 Fundamental Commissioning Requirements. 1.3SUBMITTALS A.Provide submittal documentation relative to commissioning as described in Section 01330 Shop Drawings/Submittals.PART 2   PRODUCTS2.1TEST EQUIPMENTA.Refer to Section 01810 Fundamental Commissioning Requirements, Part 2. PART 3   EXECUTION3.1COMMISSIONING PROCESS REQUIREMENTSA.Refer to Section 01810 Fundamental Commissioning Requirements and related sections for information on meetings, Start-up plans, Functional testing, operations & maintenance data, training requirements, and other Commissioning activities.3.2SENSOR CALIBRATIONA.Calibrate field-installed temperature, relative humidity, CO2, pressure sensors, pressure gages, and actuators (dampers and valves) using the methods described below. Document Calibration procedures during execution of the Start-up Plan on the Prefunctional Checklists. Alternate methods may be used, if approved by the ENGINEER. B.Test instruments shall have had a NIST certified calibration within the last 12 months. Sensors installed in the unit at the factory with provided calibration certification need not be field calibrated.C.Sensors: 1.Verify that sensor locations are appropriate and away from causes of erratic operation.  2.Verify that sensors with shielded cable are grounded only at one end. 3.For sensor pairs that determine a temperature difference, ensure that they are reading within 0.2°F of each other. 4.For sensor pairs that determine a pressure difference, ensure that they are reading within 2% of each other.5.Calibration: Put the equipment in operation. Take a reading with a calibrated test instrument within six inches of the site sensor. Verify that the sensor reading (via the permanent thermostat or gage) is within the tolerances in the table below of the instrument-measured value. If not, calibrate or replace sensor.6.Tolerances:SensorRequired Tolerance (+/-)Cooling coil water temperatures 0.4?FAHU wet bulb or dew point 2.0?FHot water coil1.5?FOutside air, space air, duct air temperatures 0.4?FWatt-hour, voltage & amperage1% of designPressures, air, water and gas3% of sensor range (inc. design value)Flow rates, air10% of designFlow rates, water4% of designFlow rates, natural gas5% of sensor range that includes design valueRelative humidity4% CO2 monitor100 ppm Sound level5 Db3.3TESTING REQUIREMENTSA.The Commissioning Authority (CA) will prepare testing procedures using the Design Intent Document, the testing requirements listed in these specifications, and commissioning data submitted by the contractors in accordance with these specifications. The testing procedures will require the following minimum information: 1.Test number.2.Date and time of the test.3.Indication of whether the record is for a first test or retest following correction of a problem or issue.4.Identification of the system, subsystem, assembly, or equipment.5.Conditions under which the test was conducted, including (as applicable) ambient conditions, set points, override conditions, and status and operating conditions that impact the results of the test.6.Expected performance of the systems and assemblies at each step of the test.7.Narrative description of observed performance of the system, equipment, or assembly.8.Notation to indicate whether the observed performance at each step meets the expected results.  9.Issue number, if any, generated as the result of the test.10.Dated signatures of the person performing the test and of the witness.B.PACKAGED ROOFTOP UNITS (RTU) & CONTROLS TESTING REQUIREMENTS1.Mechanical subcontractor to start-up and to document PACKAGED ROOFTOP UNITS & CONTROLS under the observation of the CA using a start-up plan prepared by the contractor. Start-up Plans are described in Section 01810 Fundamental Commissioning Requirements.2.Mechanical and air balance subcontractors to perform functional testing under the observation of the commissioning authority who will record the results of the functional test procedures.3.Equipment & Components to be Testeda.Compressor Unit (fans, coils, compressors, dampers, ducts, control interlocks, sensors) b.Control (thermostats)c.Safety Interlocks4.Functions, Modes, and Testing Conditionsa.Test each sequence in the sequence of operations, and other significant modes and sequences not mentioned; including startup, shutdown, unoccupied & manual modes and power failure. Test functionality of this piece of equipment or system in all control strategies or interlocks that it is associated with.b.Test mixed air, supply air, and reset temperature control functions.c.Verify economizer functions properly: Seasonal test required, cooling season, heating season, design conditions (ASHRAE 2½%).d.Verify supply, return, and exhaust fan interlocks.e.Test compressor unloading & condenser fan staging for head pressure control.f.Test duct static pressure (SP) control.g.Verify damper interlocks and correct modulation in all modes including fire and smoke dampers..h.Verify minimum outdoor air volume and control: Seasonal conditions can be simulated. [Seasonal conditions can be simulated].i.Verify supply fan air volume (verification done by air balance subcontractor): [Seasonal conditions can be simulated].j.Verify that alarms (low limits, high temp, and the like) are working correctly.k.Test Heating and cooling capacities: Seasonal test required, cooling season, heating season, design conditions (ASHRAE 2½%).l.Test Heating and cooling Coefficient of Performance (COP): Seasonal test   required, cooling season, heating season, design conditions (ASHRAE 2½%).m.Verify change over function from heating to cooling.n.Verify control strategies, schedules and set points to be reasonable and appropriate.o.Verify sensor calibration on controlling temperature or pressure sensors.5.Required Monitoring: 1 hour or less.6.Acceptance Criteria:a.(Section 3.3, (B-4), Items a-o): For the conditions, sequences and modes tested, the system, integral components and related equipment respond to varying loads and changing conditions and parameters appropriately as expected, as specified and according to acceptable operating practice.b.(Section 3.3, (B-4,b)) RTU shall be able to maintain the SA temperature within 1.0° F either side of the dead band of the current set point without excessive hunting.c.(Section 3.3, (B-4,f)) RTU and controls shall control the duct static pressure so that it does not drift more than an amount equal to 10% of the set point value either side of the dead band without excessive hunting.7.Test all units.C.SPLIT AC AND HEAT PUMP UNITS & CONTROLS TESTING REQUIREMENTS1.Mechanical subcontractor to start-up and to document SPLIT AC AND HEAT PUMP UNITS & CONTROLS under the observation of the CA using a start-up plan prepared by the contractor. Start-up Plans are described in Section 01810.2.Mechanical and air balance subcontractors to perform functional testing under the observation of the commissioning authority who will record the results of the functional test procedures.3.Equipment & Components to be Testeda.Compressor Unit (fans, coils, compressors, dampers, ducts, control interlocks, sensors) b.Fan Coil unitsc.Control (thermostats)d.Safety Interlocks4.Functions, modes, and Testing Conditions a.Test each sequence in the sequence of operations, and other significant modes and sequences not mentioned; including startup, shutdown, unoccupied & manual modes and power failure. Test functionality of this piece of equipment or system in all control strategies or interlocks that it is associated with.b.Test mixed air, supply air, and reset temperature control functionsc.Verify supply, return, and exhaust fan interlocksd.Test compressor unloading & condenser fan staging for head pressure control
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