Min Oa Damper; Heating Menu - Daikin MicroTech III Operation Manuals

Min OA Damper

Table 10: Min OA Damper Menu
Item Display Name
Min OA Pos=
Vent Limit=
LoFlo V Lmt=
DCV Limit=
Min OA SCR=
Min OA Pos is a status only item which indicates the current
minimum position of the outdoor damper . This value does not
go above a value called the Ventilation Limit and does not go
below a value called the Demand Control Ventilation Limit .
On CAV units the Ventilation Limit and the Demand Control
Ventilation Limit are fixed values set equal to the Vent Limit=
and DCV Limit= parameters . On VAV units the OA Damper
Position increases from the Vent Limit= value to the LoFloVent
Limit= value as the VFD speed goes from 100% down to the
Min Clg Spd= value . The Demand Control Ventilation Limit in
this VAV case is determined by the Ventilation Limit X DVC
Limit=/Vent Limit= . When the Min OA Reset= parameter is
set to "None" the Min OA Pos= value is set to the Ventilation
Limit . If Min OA Reset= is set to Network, Ext VDC, Ext mA,
IAQ VDC, or IAQ mA, the Min OA Pos= varies between the
Ventilation Limit and the Demand Control Ventilation Limit as
the reset signal varies from its maximum to minimum value .

Heating Menu

The Heating menu provides a summary of the control
parameters for units with heating . The unit's heating mode
of operation is controlled by the control temperature and the
heating setpoint temperature . The unit goes into the heating
mode of operation by analyzing the control temperature .
Table 11: Heating Menu
Item Display Name
Occ Htg Spt =
Unocc Htg Spt=
MWU Spt=
DAT Htg Spt=
Occ Htg Spt is an adjustable item which sets the control
temperature below which the unit will go into the heating mode
of operation .
Unocc Htg Spt is an adjustable item which sets the zone
temperature below which the unit starts up and provides
unoccupied heating (night setback) during unoccupied periods .
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Default Setting
-
20%
30%
10%
—
Vent Limit is an adjustable item that sets the value of the
Ventilation Limit on a CAV unit or when a VAV unit is at 100%
discharge fan speed .
LoFlo Vent Limit is an adjustable item that sets the maximum
value for the Ventilation Limit on a VAV unit . The ventilation
limit is raised toward this value as the discharge fan speed
decreases toward the Min Clg Spd value .
DCV Limit is an adjustable item that sets the value of the
Demand Control Ventilation Limit on a CAV unit or when a
VAV unit is at 100% discharge fan speed . This item is only
used when the "Min OA Reset=" is set to something other than
"None ."
Min OA Src = is a status only item that indicates the action that
is winning for control of the OA damper position .
The control temperature can be return temperature, space
temperature or outside air temperature . The unit goes into the
heating mode of operation when the control temperature is
below the heating setpoint by more than ½ the deadband .
Default Setting
68 .0°F
55 .0°F
70 .0°F
85 .0°F
MWU Spt is an adjustable item which sets the heating
setpoint to be used during morning warm up on a discharge
temperature control unit . CAV units use the Occ Htg Spt for
morning warmup operation .
DAT Htg Spt is an adjustable parameter which sets the
heating discharge set point .
29
Range
0–100%
0–100%
0–100%
0–100%
VentLmt
DesFlw
FldFlw
Network
Ext VDC
Ext mA
IAQ VDC
BSPOvrd
FanDiff
DCVLmt
ZeroOA
Range
0 .0–100 .0°F
40 .0–100 .0°F
40 .0–100 .0°F
40 .0–140 .0°F
OM 920-6 • MICROTECH UNIT CONTROLLER
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