18 August 1998
(a) Occupied Mode. The control valve will be modulated by the UMCS from the signal of
the space temperature sensor to maintain its setpoint. On a rise in space temperature, the UMCS will
gradually close the heating coil valve and after passing through a deadband, the UMCS will gradually
operate the outside-air damper to admit outside-air beyond the minimum quantity.
Unoccupied Mode. The UMCS will open the heating coil control valve to the coil.
(6) Mixed-Air Temperature Control. The UMCS will modulate the outside air, return air, and
relief air dampers from the signal of the space temperature sensor to maintain the space temperature at a
control setpoint 4 degrees F higher than the heating setpoint. When the space temperature continues to
rise, the outside air and relief air damper shall modulate to 100% open, and the return air damper shall
modulate closed, and stay at this position until the space temperature drops below the control setpoint.
When the space temperature drops below the control setpoint, the outside air and relief air dampers will
modulate to their minimum position and the return air damper will go to its corresponding position.
(7) Smoke Control. Smoke detectors in the supply-air ductwork will stop the supply fan and
initiate a smoke alarm if smoke is detected. Restarting the supply fan will require manual reset at the