FlexStat 13 Operation Guide, Rev. R
position, not the minimum outside air
percentage.) The OA damper shall be at this
position when Space CO2 is at or below
CO2 BASE. The value is determined using
DCV DAMPER SETUP.
OAFULL = The outside air damper position (5%
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.
OAHIGHVENT = The highest temperature (80°
F default) that would use 100% OA for
recovery.
OALOWVENT = The lowest temperature (65° F
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.)
OAMAX = The maximum allowable % of outside
air damper position (40% default) for
ventilation (not cooling) purposes. The value
is determined using DCV DAMPER SETUP.
OAPURGE = During the 60 minutes prior to
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.
VENTMODE = Displays (only) in which ventilation
mode the FlexStat is functioning (see
illustration):
• Normal—Typical ventilation during
the occupied period (after Pre-purge,
Startup, or Recovery modes have
of them. (If there is a Low Limit alarm,
however, these signals are overridden, and
the damper is closed.)
Thethreetypesofcongurationshavevariouscom-
binationsofthefollowingDCVOPTIONS.
CLGDESIGNTEMP = The highest outside air
temperature (95° F default) for which the
building’s cooling system is designed.
CO2MAX(PPM) = The desired maximum CO
2
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.
CO2SETPT(PPM) = The desired CO
2
level at which
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.)
CO2BASE(PPM) = The presumed average CO
2
concentration level of outside air at the
building’s location (400 ppm default).
DCVDAMPERSETUP = 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
airows for these four positions are
determined by ASHRAE 62.1-2007 section
6.2.6.2. A technician/balancer uses this
menu to set specic damper positions and
measure the resulting airows. The damper
positions are then correlated to the required
airows. One hour after the setup mode is
activated, it will return to the default AUTO
seing, or it can be manually set to AUTO
after testing is completed.
FANMAXOFF(MINS) = The maximum time (30
default) the supply fan may remain o
during occupied times.
HTGDESIGNTEMP = The lowest outside air
temperature (20° F default) for which the
building’s heating system is designed.
OAAREA = 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
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