MANUAL OPERATION DRAWING ONE VENTILATION The manual 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. TEMPERATURE CONTROL -1- If the occupied space is thermally satisfied, keep the heating valve closed to the heating coil, keep the cooling valve closed to the cooling coil and leave the manual dampers in the minimum ventilation position. -2- If the occupied space starts to become cool, hold the manual dampers in the minimum ventilation position, keep the cooling valve closed to the cooling coil and open the heating valve to the heating coil only enough to hold the occupied space within the thermal comfort zone. -3- When the occupied space starts to become warm below 13°C outside. - Gradually reduce the quantity of hot water entering the heating coil. If the heating valve is completely closed off to the heating coil and the occupied space continues to increase in temperature, keep the heating valve closed to the heating coil, adjust the manual dampers to gradually reject the warm return air and bring more cool outside air into the occupied space. - Do not allow the mixed air to drop below 13°C. - Do not starve the supply fan or create a high discharge pressure on the return fan. -If the air temperature after the heating coil drops below 5°C in any area of the coil, shut the fan down to prevent freezing of the coils. -4- When the occupied space starts to become warm above 13°C outside: - Follow the procedure outlined in "3". If the outside air can not cool the occupied space, gradually open the cooling valve to the cooling coil just enough to keep the occupied space 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. 8.68
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