Microprocessor Controller for MUA
16
®
Menu
o
uTside
d
amper
p
osiTion
- o
ccupied
This screen only appears if equipped with a modulating OA and recirculating
damper. The screen displays the min and max positions for the outside air damper.
These setpoints reflect the percentage of the outside air damper being opened.
0% = Full recirculation air | 100% = Full outside air
*Note: If the unit is equipped with a modulating OA damper but intended to be 100%
outside air, the minimum and maximum should both remain at 100%.
Minimum Position
– When in the occupied mode, the active setpoint will be equal
to a local minimum OA setpoint, which may be constant or reset by fan speed if
equipped with a modulating supply fan.
Maximum Position
– Each sequence that can adjust the OA damper setpoint
contains a maximum position to prevent excess OA. The active setpoint will be
determined based on the greatest demand of the configured sequences.
The OA damper setpoint can then be further adjusted between the minimum
and maximum OA settings with sequences such as CO
2
, Building Pressure and
Economizer.
Setpoint Selections:
Constant Position
– The min OA percentage is constant; set by the controller.
SF Reset
– The min and max positions are reset by the supply fan speed.
BMS
– The BMS can directly control the OA damper position between the min ad
max percentages.
Building Pressure
– Damper position is reset by a building pressure control loop.
CO
2
– Damper position is reset by a demand-controlled ventilation control loop
based on space CO
2
levels. The CO
2
max is the highest percentage that the OA
damper can modulate when solely based on CO
2
.
2-Position
– Damper sequence that utilizes a contact closure to determine which
position the OA damper is commanded; minimum or maximum. The “Max Vent”
contact closure maybe be field configured to temporarily force the unit into
occupied mode. Reference Ctrl Variables/Advanced/Advanced Setpoints/Max
Vent to enable this option.
0-10 By Others
– The 0-10V signal directly correlates to the damper position of
0-100%. When the signal is below the minimum damper position setpoint, the
damper will modulate to minimum position. When the signal is above the maximum
damper position setpoint, the damper will modulate to max position.
F
an
d
amper
d
elay
This screen allows adjustment for delay time between damper opening and fan
operation.
This timer allows the damper to open before the fan start sequence
begins. This prevents the fans from having to overcome higher static pressure
when the damper(s) are opening.
Control Variables
Damper Control
The
Damper Control
menu’s allows the user to adjust damper control setpoints.
o
uTside
d
amper
p
osiTion
- u
noccupied
Occupied and unoccupied damper control have minimum and maximum set points
for the specific mode of operation. Unoccupied OA Damper control typically will
only show the minimum set point. The maximum will also appear if the OA Damper
is controlling to building pressure.
Содержание PGD1000W00
Страница 39: ...Microprocessor Controller for MUA 39 ...
