KMC Controls FlexStat BACnet Operation Manual page 13

of them. (If there is a Low Limit alarm,
however, these signals are overridden, and
the damper is closed.)
The three types of configurations have various com-
binations of the following DCV OPTIONS.
CLG DESIGN TEMP = The highest outside air
temperature (95° F default) for which the
building's cooling system is designed.
CO2 MAX (PPM) = The desired maximum CO
concentration level during an occupied
period (1000 ppm default). In BASIC and
STANDARD DCV modes, the economizer
damper will modulate to fully open at this
level.
CO2 SETPT (PPM) = The desired CO
point the economizer damper will begin
modulating open from MIN POSITION
(600 ppm default). Below this level,
the economizer damper will be at MIN
POSITION during Occupied mode. (This
can be adjusted no lower than the CO2
BASE.)
CO2 BASE (PPM) = The presumed average CO
concentration level of outside air at the
building's location (400 ppm default).
DCV DAMPER SETUP = A test mode is used to
determine proper outside air damper
position values for OA AREA, OA FULL,
OA MAX, and OA PURGE. The required
airflows for these four positions are
determined by ASHRAE 62.1-2007 section
6.2.6.2. A technician/balancer uses this
menu to set specific damper positions and
measure the resulting airflows. The damper
positions are then correlated to the required
airflows. One hour after the setup mode is
activated, it will return to the default AUTO
setting, or it can be manually set to AUTO
after testing is completed.
FAN MAX OFF (MINS) = The maximum time (30
default) the supply fan may remain off
during occupied times.
HTG DESIGN TEMP = The lowest outside air
temperature (20° F default) for which the
building's heating system is designed.
OA AREA = The outside air damper position (2%
default) required to provide the outdoor
air rate based on the zone area. This is
based on ASHRAE 62.1-2007 section 6.2.6.2.
(Note that this value represents the damper
FlexStat
OA FULL = The outside air damper position (5%
2
OA HIGH VENT = The highest temperature (80°
OA LOW VENT = The lowest temperature (65° F
level at which
2
OA MAX = The maximum allowable % of outside
2
OA PURGE = During the 60 minutes prior to
Cooling
Setpoint
Position
VENT MODE = Displays (only) in which ventilation
13
position, not the minimum outside air
percentage.) The OA damper shall be at this
position when Space CO2 is at
CO2 BASE. The value is determined using
DCV DAMPER SETUP.
default) for the OA AREA plus the people
occupying the space. The outside air
damper shall be at this position when
Space CO2 is at CO2 MAX. The value is
determined using DCV DAMPER SETUP.
F default) that would use 100% OA for
recovery.
default) which would use 100% OA for
recovery. (If outside air temp is between OA
low vent and OA high vent, the outside air
damper will be open 100% during recovery
mode.)
air damper position (40% default) for
ventilation (not cooling) purposes. The value
is determined using DCV DAMPER SETUP.
scheduled start time, the outside air
damper will open to this position (0%
default) to perform a purge of the zone. The
value is determined using DCV DAMPER
SETUP.
(Unoccupied) (Occupied)
Scheduled
On Time
Occupancy
Night Flush
(Economizer
Cooling) Startup*
Pre-purge
Normal
OAD
(*Available only on FlexStats with motion sensors)
mode the FlexStat is functioning (see
illustration):
• Normal—Typical ventilation during
the occupied period (after Pre-purge,
Startup, or Recovery modes have
or below
(Unoccupied)
Scheduled
Off Time
Occupancy
Standby* Override*
Recovery
Standby
(Manual)
Override
Operation Guide, Rev. Q