Instruction manual

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desCrIptIon of operatIon
The UVC monitors the DAT to ensure it does not fall below VCLL.
The CO
2
demand controlled ventilation function (optional) will be active (see "CO
2
De-
mand Controlled Ventilation (optional)" on page 33) and the OA damper is adjusted
as needed to maintain the CO
2
set point.
Figure 11: Econ state operation (occupied mode and auto fan)
Econ Mech State (State 1)
The Econ Mech state is a “normal” state during Cool mode. The Econ Mech state typi-
cally is active in the Cool mode when primary cooling (economizer) alone is not adequate
to meet the cooling requirements and both primary cooling and secondary cooling (com-
pressor) are available.
When the Econ Mech state becomes active, the OA damper is set to 100% open, and
the UVC uses the units mechanical cooling capabilities as needed to maintain the ef-
fective cooling set
point (see "Space Temperature Set Points" on page 25).
The UVC monitors the DAT to ensure it does not fall below MCLL.
Figure 12: Econ mech state operation (occupied mode and auto fan)