MANUAL OPERATION DRAWING ONE VENTILATION The manual mixed air dampers are manually adjusted to allow at least minimum ventilation at all times the space is occupied, addressing the greater of occupancy rates or exhaust fan air replacement quantities. Shut down the fan at unoccupied times if it is not required. Adjust the manual dampers to full recirculation at unoccupied times if there is no danger of collapsing the ductwork or creating another problem. Duty cycle the fan at unoccupied times from a set back thermostat if this suits the system. TEMPERATURE CONTROL -1- If the all the zones are thermally satisfied, keep the heating valve closed to the hot deck coil, keep the cooling valve closed to the cold deck coil and leave the manual mixed air dampers in the minimum ventilation position. -2- If any zone starts to become cool, adjust that zone’s manual zone dampers to full hot deck and no cold deck. Then increase the hot deck temperature just enough to keep that zone within the comfort zone. - Adjust the other zones’ dampers to blend hot and cold deck air to satisfy each zone’s particular thermal requirement. -3- If any zone starts to become warm when the outside air is below 55°F, adjust that zone’s manual zone dampers to full cold deck and no hot deck. - Gradually open the fresh air damper and exhaust air damper while closing the return air damper. - Do not allow the mixed air to drop below 55°F. - Do not starve the supply fan or create a high discharge pressure on the return fan. - Adjust the other zones’ dampers to blend hot and cold deck to satisfy each zone’s particular thermal requirement. - If the air temperature after the heating coil drops below 38°F in any area of the coil; shut the fan down to prevent freezing of the coils. -4- When any zone starts to become warm above 55°F outside: - Follow the procedure outlined in "3". If the outside air can not satisfy the warmest zone, gradually open the cooling valve to the cold deck cooling coil just enough to keep the warmest zone within the thermal comfort zone. - When the outside air becomes less efficient to cool than the return air from the occupied space, return the manual dampers back to the minimum ventilation position. 8.83
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