OM 1280-2 • MICROTECH UNIT CONTROLLER 24 www.DaikinApplied.com
A space humidity sensor or network input is required in order
and when the UVC is in the fan only mode, and the source
(water-in) temperature is acceptable for cooling, the UVC uses
F&BP damper from opening the coil face greater than 20%-
face (default); the space fan remains in medium speed during
cooling. Unless the indoor coil/suction refrigerant temperature
drops below 32°F at which point the fan speed will increase to
with Reheat Units)
UVC can go into when the Fan Only mode is active (the control
temperature is between the heating and cooling setpoints and
the unit’s mechanical cooling capacity is set to 100% and all
stages of electric/hydronic heat are used to maintain the DAT
at the occupied heating setpoint. On Face & Bypass Control
models the damper will module to full face. If the heating
output reaches 100% open for 3-minutes or more (e.g., heating
cannot keep up with cooling), the cooling is staged down until
the DAT reaches the occupied heating setpoint. The UVC
monitors the DAT to ensure it does not fall below MCLL, nor
goes above DAHL. The space fan is forced to low speed when
directly into the appropriate heating or cooling state.
by a binary input, a network input or by UVC logic if the unit
is equipped with a space humidity sensor. If enabled by the
mode is disabled when the input is removed. If enabled by
The CO
2
demand controlled ventilation function (optional)
will be available (see “CO
2
Demand Controlled Ventilation
(optional)” on page 37), and the OA damper is adjusted as
needed to maintain the CO
2
setpoint.
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