Specifications - Lord and Son Construction, Inc.

Occupancy Output shall be determined by the default schedule and the
Space Occupancy Inputs. Otherwise, the output shall be determined as
follows:
(1) If the Override Occupancy Input is not OC_NUL, the Air Handler
Occupancy Output shall determined as follows:
(a) The output shall be Occupied when the Override OccupancyInput
is OC_OCCUPIED.
(b) The output shall be Unoccupied when the Override
OccupancyInput is OC_UNOCCUPIED.
(c) If the system Sequence Of Operation specifies Warm-Up-Cool-
Down mode, the output shall be Warm-Up-Cool-Down when the Override
Occupancy Input is OC_STANDBY.
(2) If the Override Occupancy Input is OC_NUL and the Schedule
Occupancy input is OC_OCCUPIED, the Air Handler and Stand-Alone
Terminal Unit Occupancy Output shall be OC_OCCUPIED.
(3) If the Override Occupancy Input is OC_NUL, the Schedule Occupancy
input is not OC_OCCUPIED, and less than required number of Space
Occupancy Inputs (as shown on the Occupancy Schedule Drawing) are
OC_OCCUPIED (or the hardware BI is Unoccupied), the Air Handler
Occupancy Output shall be determined by the Scheduled Occupancy
Input
(a) The output shall be Occupied when the Scheduled Occupancy
Input is OC_OCCUPIED.
(b) The output shall be Unoccupied when the Scheduled Occupancy
Input is OC_UNOCCUPIED.
(c) If the system Sequence Of Operation specifies Warm-Up-Cool-
Down mode the output shall be Warm-Up-Cool-Down when the Scheduled
Occupancy Input is OC_STANDBY.
(4) If the Override Occupancy Input is OC_NUL and at least the
required number (as shown on the Occupancy Schedule Drawing) of
Space Occupancy Inputs are OC_OCCUPIED (or the hardware BI is
Occupied), the Air Handler Occupancy Output shall be Occupied.
3.4.2.4 Air Handler System Scheduling
The AHU Occupancy Output SNVT shall be bound from the System Scheduler to
the DDC Hardware that executes the Occupancy Mode Determination part of the
Air Handler Sequence of Operation.
For Air Handlers using occupancy sensors, the occupancy sensor output SNVT
(of type SNVT_Occupancy) shall be bound to a Space Occupancy Input of the
System Scheduler.
Section 23 09 23 Page 35