Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT019110 – General Commissioning RequirementsIssue Date:October 17, 2012Page #:18 of 305. The contractor will transmit the full startup plan to the subcontractors fortheir review and use.D. Sensor and Actuator Calibration. All fieldinstalled temperature, relative humidity, CO, CO 2 , refrigerant, O 2 , and/or pressure sensors and gages, and all actuators(dampers and valves) on all equipment shall be calibrated. Verify that all locations are appropriate and away from causes of erratic operation. All test instruments shall have had a certified calibration within the last 6 months to NISTtraceable standards, and comply with all local, state and/or federal requirements/certifications, as required. Sensors installed in the unit at the factory withcalibration certification provided need not be field calibrated.E. Valve and Damper Stroke Setup and Check BAS Readout Verify 100% valveand damper operations. For all valve and damper actuator positions, verify the actual position against the Building Automation System (BAS) readout. Set pumpsor fans to normal operating mode. Command valve or damper closed, visuallyverify that valve or damper is closed and adjust output zero signal as required.Command valve or damper open, verify position is full open and adjust outputsignal as required. Command the valve or damper to a few intermediate positions. If the actual valve or damper position doesn’t reasonably correspond, replace actuator or add pilot positioner (for pneumatics).F. Closure for heating coil valves (NO) Set the heating setpoint 20°F above roomtemperature. Observe valve open. Remove control air or power from the valveand verify that the valve stem and actuator position do not change. Restore tonormal. Set the heating setpoint to 20°F below room temperature. Observe thevalve close. For pneumatics, by override in the BAS, increase pressure to valveby 3 psi (do not exceed actuator pressure rating) and verify valve stem and actuator position does not change. Restore to normal.G. Closure for cooling coil valves (NC) Set the cooling setpoint 20°F above roomtemperature. Observe the valve close. Remove control air or power from thevalve and verify that the valve stem and actuator position do not change. Restoreto normal. Set the cooling setpoint to 20°F below room temperature. Observevalve open. For pneumatics, by override in the BAS, increase pressure to valve by3 psi (do not exceed actuator pressure rating) and verify valve stem and actuatorposition does not change. Restore to normal.H. Execution of Construction Checklists and Startup.GENERAL COMMISSIONING REQUIREMENTS 01910 18