Trane Tracer VV550 Installation, Operation And Maintenance Manual page 95

Table 62. Space temperature control VAV unit operation (continued)
nvi Applic
Mode nvi Heat Cool
Power-up
STC occupied/unoccupied cool
STC occupied/unoccupied heat
VFC (occupied or unoccupied)
Flow tracking
Output
b.
Air valve
Reheat
Fan
Ventilation
Requirements
(Vent req)
c. When communicated application mode is equal to HVAC_TEST, or communicated application mode is equal to HVAC_AUTO
and communicated heat/cool mode is equal to HVAC_TEST, nvoUnitStatus.mode reports HVAC_TEST. The controller
otherwise treats HVAC_TEST the same as HVAC_AUTO for communicated application mode and communicated heat/cool
mode.
d. Zone demand is heat when the space temperature < heat setpoint. Zone demand is cool when the space temperature > cool
setpoint AND space temperature > heat setpoint + 0.5°F.
e. Emergency override leaves nvoHeatCool and nvoUnitStatus.mode as is. Just like Tracer
f. A flow override whether initiated by nviFlowOverride or by star or double star on the zone sensor thumbwheel reports test.
Table 63. Ventilation flow control and flow tracking VAV unit operation
nviApplicMode nviHeatCool
Auto not valid (any Auto not valid (any
enumeration not enumeration not
listed) listed)
Off
Off Don't care
a.
Output
Air valve
Reheat
Fan
CNT-SVX17G-EN
a, c
nvoHeatCool
nvoUnitStatus. nvoEffect
mode Occup
Zone demand
is cool d
Zone demand
is heat d
Enabled meaning
Control can use air valve
Control can use reheat
Control can run fan
Ventilation requirements are enforced
nvoHeatCool
nvoUnitStatus.mo
de
Cool
Off
Off
Enabled meaning
Control can use air valve
Control can use reheat
Control can run fan
Appendix C: Mode Control Operation
Output Operation
b
Cool Cool
Heat Heat
Cool Cool
Cool Cool
Disabled meaning
Air valve is closed
Reheat is Off
Fan is Off
Ventilation requirements are
waived (air valve may close)
®
ZN510/520.
nvoEffectOccup Outputs
Unoccupied
Air valve
Occupied
Reheat
Bypass
Fan
Standby
Unoccupied
Air valve
Occupied
Reheat
Bypass
Fan
Standby
Unoccupied
Air valve
Occupied
Reheat
Bypass
Fan
Standby
Disabled
meaning
Air valve is closed
Reheat is Off
Fan is Off
Temp control
sequence
a
Operation
Enabled
Enabled
b
Not present
Disabled
Disabled
b
Not present
Disabled
Disabled
b
Not present
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