Honeywell CVL4022ASVAV1 Engineering Manual page 70

Net Data Type
Nv/field SNVT
nviEmergCmd hvac_emerg
nviFan switch
value
state
nviFlowOffset lev_percent
nviFlowOverride hvac_overid
state
percent SNVT_
lev_percent
31-00083—02
Table 21. Network Variable - Inputs (Continued)
AP Internal
Units
hvac_emerg Emergency network input command that overrides normal control action
%
ubyte
%
during a given emergency (such as a fire). The valid enumerated values
have the following meanings:
0 – Normal with no override
1 – Pressurize, move the damper to the emergency pressurize position.
2 – Depressurize, move the damper to the emergency depressurize
position.
3 – Purge, move the damper to the emergency purge position
4 – Shutdown
All other values are ignored.
Note:
nviEmergCmd has priority over the network flow override command.
If the emergency command is active (values 1 to 4), the series or parallel
terminal fan is disabled.
nviEmergCmd has priority over the network command nviFan.
nviEmergCmd will override a disabled controller.
Fan override signal. Typically used during airflow balancing.
Notes:
Emergency command (nviEmergCmd) has priority over nviFan override
Fan override alarm is annuciated when this network input is active.
Modulating override signal
If nciFan.Type = 4 (parallel fan with spd control)
Then override fan modulating output
Else ignore override value
0 = fan off
1 = fan on
NUL = no override
Note: The state value must be set to NULL to disable the override signal
Airflow offset to the occupied minimum airflow setpoint.
Typically used to improve indoor air quality.
-100 ≤ range ≤ 100%
Pressure dependent, Occupied & Valid Value
EffMinFlowSP = MinFlowSP + nviFlowOffset
Pressure independent, Occupied & Valid Value
EffMinFlowSP = MinFlowSP +
(nviFlowOffset*MaxFlow/100)
Airflow cooling output override. Used for flow balancing or to command the
VAV box to manual states.
0 = no override (normal operation)
1 = manual flow damper position
2 = effFlowSetPt is set to the ManFlowValue input
3 = Flow percent
4 = open damper
5 = close damper
6 = effFlowSetPt is set to the minFlowSetPt input
7 = effFlowSetPt is set to the maxFlowSetPt input.
(all others) = no override
Notes:
All active values (non zero) disable the staged heating.
Manual percent value.
State
1: Manual Position Damper position set to the percent value.
3: Flow Percent Command flow set to the percent value.
range 0 ... 100 %
70
Description
Function