Honeywell CVL4022ASVAV1 Engineering Manual page 81

Nv/field
nvoFanOn
nvoFlowTrack
nvoFreshAirRatio
nvoIaqOvr
nvoMonSensor
nvoMonSw
nvoOdHum
nvoOdTemp
nvoPeriphHtgPos
nvoPeriphHtgStgs
Table 22. Network Variable - Outputs (Continued)
Net Data Type
SNVT Indicates the fan status
switch
State
SW_OFF
SW_ON
SW_NUL
SNVT Reports the air flow measured at this node plus nviFlowTrack. If a flow sensor error
flow has been detected or PressureDependent is True, then FlowTrackOut is set to
Invalid. If nviFlowTrackIn is Invalid, FlowTrackOut is also set to Invalid.
0 ≤ range
SNVT This is FreshAirRequired divided by BoxFlow. When FreshAirRatio is Large (greater
lev_percent than or equal to 100 percent), there is insufficient fresh air being supplied to the
zone even if the supply air is 100 percent fresh air. When FreshAirRatio is small,
there is sufficient fresh air being supplied to the zone. FreshAirRatio is used for
coordination within the HVAC subsystem and energy management decisions by the
supply equipment. If the actual FreshAirRatio is greater than 150 percent,
FreshAirRatio reports 150 percent.
If BoxFlow is zero, then FreshAirRatio is Invalid. If the calculated ratio is greater than
the range that can be handled by a two byte number, then FreshAirRatio is set to the
biggest number possible before Invalid is indicated.
The FreshAirRatio is zero when the zone is: UnOccupied, Bypass, configured for
flow tracking or freeze protect mode
≤
0 range
SNVT Allows an indoor air quality sensor to be shared with other nodes and is typically
switch bound to nviIaqOvr on fan system nodes.
State
SW_OFF
SW_ON
SW_NUL
SNVT Monitor sensor. This allows an unused analog input to be used as a generic network
count_inc_f accessible value monitor.
-3.399999952144364E38
SNVT Monitor switch status. This allows an unused binary input to be used as a generic
switch network accessible digital status monitor.
State
SW_OFF
SW_ON
SW_NUL
SNVT Outdoor air relative humidity
lev_percent
0 ≤ range
SNVT Outdoor air temperature
temp_p
-40 ≤ range
SNVT Peripheral heat modulating valve position.
lev_percent
≤
0 range
SNVT Number of active peripheral heating stages.
count ≤
0 range
Description
Value
0 Fan output inactive
0 < Fan output active
0 Fan output inactive
≤ 138850 cfm
≤
150%
Value
0 The indoor air quality is acceptable
100% The indoor air quality is not acceptable and additional
outdoor air is needed to bring it back to acceptable
0 The economizer for this node has not been configured or
there is no sensor configured or the only configured
sensor has failed.
≤ ≤
range
Value
0 inactive
100 active
not configured
≤ 100 %
≤ 122F
≤
100%
≤
1
81
Meaning
Meaning
3.399999952144364E38
Meaning
31-00083—02