McQuay OM 751 13
Description of Operation
Figure 6: Complete UVC—state diagram
UVC Unit Modes
The UVC provides several “normal” modes of unit operation. These include: Off, Night
Purge, Fan Only, Cool, Emergency Heat, Auto, Heat, and Cool.
Normal UVC modes can contain a single state or several states depending upon the
functionality required for each particular mode. Each UVC state is assigned a number, which
can be very helpful when trying to understand which state is currently active within the UVC.
To view the current UVC state number, use the keypad/display.
EmergencyHeat
ModeSuperState
FullHeat
CantHeat
Heat
LowLimit
7
D
5
E
FanOnly
A
NightPurge
8
Off
9
HeatMode
SuperState
AutoMode
Econ
EconMech
Mech
3
1
2
CantCool
C
DAHeat
LowLimit
4
F
CoolMode
SuperState
CantHeat
B
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