Appendix C: Mode Control Operation - Trane Tracer VV550 Installation, Operation And Maintenance Manual

Appendix C: Mode Control Operation

Mode control operation is described in these tables:
•
•
Table 62. Space temperature control VAV unit operation
nvi Applic
Mode nvi Heat Cool
Auto, test, not Auto, test, not
valid (any valid (any
enumeration enumeration
not listed) not listed)
Heat
Morning warm-
up
Cool
Night purge
Pre-cool
Off
Maximum heat
Heat Don't care
CNT-SVX17G-EN
Table 62; Space temperature control VAV unit operation
Table 63; Ventilation flow control and flow tracking VAV unit operation
a, c
nvoHeatCool
nvoUnitStatus.
mode
Determined by
a
controller or 
c
Test
Heat
Morning warm-up
Cool
Night purge
Pre-cool
Off
Maximum heat
Heat
nvoEffect
Occup Output
b
Unoccupied Air valve
Occupied Reheat
Bypass Fan
Standby Vent req
Air valve
Reheat
Unoccupied
Fan
Vent req
Air valve
Occupied
Reheat
Bypass
Fan
Standby
Vent req
Unoccupied Air valve
Occupied Reheat
Bypass Fan
Standby Vent req
Air valve
Reheat
Unoccupied
Fan
Vent req
Air valve
Occupied
Reheat
Bypass
Fan
Standby
Vent req
Air valve
Unoccupied
Reheat
Occupied
Series fan
Bypass
Parallel fan
Standby
Vent req
Air valve
Unoccupied
Reheat
Occupied
Series fan
Bypass
Parallel fan
Standby
Vent req
Unoccupied Air valve
Occupied Reheat
Bypass Fan
Standby Vent req
Unoccupied Air valve
Occupied Reheat
Bypass Fan
Standby Vent req
Air valve
Reheat
Unoccupied
Fan
Vent req
Air valve
Occupied
Reheat
Bypass
Fan
Standby
Vent req
Temp control
Operation sequence
Enabled
Enabled See appropriate row
Enabled below
Enabled
Enabled
Enabled STC 
Enabled Unoccupied heating
Disabled
Enabled
Enabled STC 
Enabled Occupied heating
Enabled
Enabled
Enabled STC 
Enabled Morning warm-up
Disabled
Enabled
Enabled STC 
Enabled Unoccupied cooling
Disabled
Enabled
Enabled STC 
Enabled Occupied cooling
Enabled
Enabled
Disabled
STC 
Enabled
Pre-cool
Disabled
Disabled
Enabled
Disabled
STC 
Enabled
Pre-cool
Disabled
Disabled
Disabled
Disabled
Off
Disabled
Disabled
Enabled
Enabled STC
Enabled Maximum heat
Disabled
Enabled
Enabled STC 
Enabled Unoccupied heating
Disabled
Enabled
Enabled STC 
Enabled Occupied heating
Enabled
93