Orange County NC Website
Browse       Search
ORANGE COUNTY 230923-15 <br /> <br />Emergency Management Warehouse Building Dehumidification Extension of Existing Direct Digital <br /> Control System for HVAC <br /> <br />CALIBRATION AND ADJUSTMENT 1 <br /> 2 <br />General: 3 <br /> 4 <br />Calibrate equipment and procedures using manufacturer's written recommendations and instruction 5 <br />manuals. Use test equipment with accuracy at least double that of instrument being calibrated. 6 <br /> 7 <br />Control System Inputs and Outputs: 8 <br /> 9 <br />Check analog inputs at 0, 50, and 100 percent of span. 10 <br /> 11 <br />Check analog outputs using milliampere meter at 0, 50, and 100 percent output. 12 <br /> 13 <br />Check digital inputs using jumper wire. 14 <br /> 15 <br />Check digital outputs using ohmmeter to test for contact making or breaking. 16 <br /> 17 <br />Check resistance temperature inputs at 0, 50, and 100 percent of span using a precision-resistant 18 <br />source. 19 <br /> 20 <br />Temperature: 21 <br /> 22 <br />Calibrate resistance temperature transmitters at 0, 50, and 100 percent of span using a precision-23 <br />resistance source. 24 <br /> 25 <br />Calibrate temperature switches to make or break contacts. 26 <br /> 27 <br />Stroke of dampers: 28 <br /> 29 <br />Without positioners, follow the manufacturer's recommended procedure, so that valve or damper is 100 30 <br />percent opened and closed. 31 <br /> 32 <br />With positioners, follow manufacturer's recommended procedure, so that valve and damper is 33 <br />positioned at 0%, 50%, and 100% closed. 34 <br /> 35 <br />Provide diagnostic and test instruments for calibration and adjustment of system. 36 <br /> 37 <br />Provide written description of procedures and equipment for calibrating each type of instrument. Submit 38 <br />procedures review and approval before initiating startup procedures. 39 <br /> 40 <br />Adjust initial temperature and humidity set points. 41 <br /> 42 <br /> 43 <br />VERIFY FINAL CONTROL ELEMENT FUNCTIONALITY 44 <br /> 45 <br />Test each final control element operator to ensure performance in accordance with Section 230913 and the 46 <br />control sequences defined on the Drawings. Test shall include full range of movement, stability through that 47 <br />range, and power and/or control signal failure performance. Operators found to be non-functional in any way 48 <br />shall be replaced. 49 <br /> 50 <br /> 51 <br />VERIFY OPERATOR AND SYSTEM FUNCTIONALITY 52 <br /> 53 <br />Verify backup system operations and switchovers including redundant processors, backup power supplies, 54 <br />battery backed memories, etc. 55 <br /> 56 <br />Verify DDC system command software by issuing commands at the operator’s console and observing display, 57 <br />printer output, or HVAC equipment responses. The following software operation shall be verified: 58 <br /> 59 <br /> 60 <br />61 <br />DocuSign Envelope ID: 7668B866-6C26-485C-9A45-DAAB5D4BD951