Appendix A - Common HVAC SNVT's
LonWorks Integration Guide
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19
SNVT #
SNVT Name
Element #
Measurement
Value
1
chiller operation mode 0 = Controller automatically changes
modes
1 = Heating only
2 = Morning warm-up
3 = Cooling only
4 = Night purge
5 = Pre-cool
6 = Controller not controlling outputs
7 = Equipment being tested
8 = Emergency heat pump
9 = Air not conditioned, fan turned on
10 = Cooling with compressor not running
11 = Ice-making mode
12 = Max Heat
13 = Economy
14 = Dehumidify
15 = Calibrate
16 = Emergency Cool
17 = Emergency Steam
18 = Max Cool
19 = HVC Load
20 = No Load
-1 = Value not available
2
chiller state
1 = in alarm
3
1 = run is enabled
4
1 = local
5
1 = limited
6
1 = chilled water flow
7
1 = conditioned water flow
128
SNVT_tod_event
0
current scheduled
occupancy state
0 = Area is occupied
1 = Area is unoccupied
2 = Area is temporarily occupied for the
bypass period
3 = Area is temporarily unoccupied
-1 = Value not available
1
next scheduled
occupancy state
0 = Area is occupied
1 = Area is unoccupied
2 = Area is temporarily occupied for the
bypass period
3 = Area is temporarily unoccupied
-1 = Value not available
2
Minutes to next state
0 — 65,535
138
SNVT_Volt_ac
0
Volt
0 — 65,535
139
SNVT_amp_ac
0
Amp
0 — 65,535
145
SNVT_hvac_type
0
enumerated
0 = Generic
1 = Fan coil
2 = VAV Terminal
3 = Heat Pump
4 = Roof Top Unit
5 = Unit Ventilator
6 = Chilled ceiling
7 = Radiator
8 = Air Handling Unit
9 = Self-contained unit
153
SNVT_Enthalpy
0
J/Kg
-32,768 — 32,767