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Specifications - City of Montpelier, Vermont

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Title:<strong>Montpelier</strong> District Heating<strong>City</strong> <strong>of</strong> <strong>Montpelier</strong>, VT15910 – Sequences <strong>of</strong> OperationsIssue Date:September 28, 2012Page #:10 <strong>of</strong> 11alarm at the HMI and open the hot water valve fully until the alarmis reset by a human operator at the HMI.E. Radiators1. Occupied/Unoccupieda. Retain the existing occupied/unoccupied schedules and setpointsfor each radiator2. Hot water system <strong>of</strong>f: Close the radiator control valve3. Hot water system on: Adjust the position <strong>of</strong> the radiator control valve tomaintain the space temperature setpointF. Cabinet Unit Heater Occupied/Unoccupied1. Retain the existing occupied/unoccupied schedules and setpoints for eachradiator2. Hot water system <strong>of</strong>f: Close the control valve and keep the fan <strong>of</strong>f.3. Hot water system on: Adjust the position <strong>of</strong> the hot water control valve tomaintain the space temperature setpoint. If the convective currents areinadequate to satisfy the space temperature, engage the cabinet heater fan.Cycle the fan to maintain space temperature.G. Gym and Auditorium Air Handling Systems with Space Radiation1. Occupied/Unoccupieda. Retain the existing occupied/unoccupied schedules and setpointsfor each room2. Unoccupied, Heating System Off:a. Disable air handler and exhaust fan, dampers closed, unit hot watervalve closed, space radiation valves closed.3. Unoccupied, Heating System On:a. Disable air handler and exhaust fan, dampers closed, unit hot watervalve closed.b. Adjust space radiation valves to maintain space temperaturesetpoint.4. Occupied, Heating System Off:a. Enable air handler and exhaust fan, keep fan and radiator hot watercontrol valves <strong>of</strong>f.b. Set air handler to 50% speed (adjustable).c. Adjust speed <strong>of</strong> exhaust fan to maintain the servedspace 0.03inches water column lower than the lobby.d. Position mixing dampers to meet space temperature setpoint.e. If the space temperature is above the setpoint and the dampers arein 100% outdoor air, raise the speed <strong>of</strong> the supply fan to increaseventilation cooling. Continue to maintain the pressure differentialbetween the servedspace and the lobby by adjusting the exhaustfan speed.SEQUENCE OF OPERATION1591010

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