Honeywell CVL4022ASVAV1 Engineering Manual page 88

NCI/Field
Type
FanEnableFlow
nciFlowLoop
31-00083—02
Table 23. Configuration Parameters (Continued)
AP
Net Data Default Internal
Type Val Units
ubyte 0 NA
SNVT 0
lev_percent
VAV box fan configuration
0: No Fan
1: Series Fan, fan runs when occupied or standby (When
nciOccStandby = 1). A Series Fan configuration should be
combined with pressure independent airflow control. This is
necessary in order to avoid energy waste by dumping uncontrolled
primary air through the induction (return air) inlet.
If the Mode is:
nciOccStandby = 1),
Occ, (Standby AND
with demand for heating; Or NightPurge
then the Fan Speed is ON
2: Parallel Fan, temperature control, fan runs with reheat
3: Parallel Fan, airflow control, fan runs intermittently based on
primary airflow and occupancy.
4: Parallel Fan, Speed control (inverse to cooling demand or
constant volume)
I
f the Effective Occupancy is:
Occ
Standby
Bypass
Unoccupied with a demand calling for cool
and:
No Htg Demand
then the Fan Speed is:
Inversely proportional to the "demand for cooling" and varies
between 0 and 100%.
If the Mode is:
Morn Warmup, Reheat, Heat with demand for heating; Or
NightPurge
then the Fan Speed is
(!00%)
Else FanSpeed is:
0%.
Refer to Appendix A for fan control details.
% Parallel fan start threshold.
During the occupied mode, the fan is started when the primary air
percent of max flow is less than or equal to FanEnableFlow
percent.
≤ ≤
0 range 100%
Precision: 1
Notes:
This setpoint applies only to the fan type Parallel airflow control.
A percent value is used to facilitate fan control independent of the
zone terminal max airflow setting.
There is a 5% hysteresis value for turning off the fan.
88
Description
Morn Warmup, Reheat, Heat