Daikin DPS - Dehumidification Set-Up

Dehumidication Set-Up
(See page 100 for more information)
Table 33: Dehumidication Menu
Dehum Method is an adjustable item used to set the
dehumidication method to either “RH” or “DewPt.” When
this parameter is set to “RH,” dehumidication operation is
controlled to maintain the Rel Humidity value at the Relative
Humidity Set Point. When this parameter is set to “DewPt,”
dehumidication operation is controlled to maintain the Dew
Point= value at the Dew Point Set Point.
RH DB is an adjustable item that sets a dead band around the
relative humidity set point. For example, if the RH Set Point
parameter is set to 50% and the RH Db parameter is set to 2%
the dead band around the set point would be from 49% to 51%.
Dewpoint DB is an adjustable item that sets a dead band
around the dew point set point. For example, if the DewPoint
Spt parameter is set to 50ºF and the DewPntDb parameter is
set to 2ºF the dead band around the set point would be from
49ºF to 51ºF.
RH Period is an adjustable item which sets the “sampling time”
used in the PI control function for controlling the reheat valve.
RH Gain is an adjustable item which sets the “Gain” used in
the PI control function for controlling the reheat valve.
RH PAT is an adjustable item which sets the “project ahead
time” used in the PI control function for controlling the reheat
valve.
RH Max Chg an adjustable item that sets the maximum value
for an increase or decrease for controlling the reheat valve.
Dehum Ctrl is an adjustable item used to select whether
dehumidication as “always” allowed or only during “occupied”
modes of operation.
Sensor Loc is an adjustable item which is used to select the
location of the humidity sensor. The location is selected by
setting the Sensor Location value on the keypad to Return,
Space, or OAT. The signicance of the sensor location is that
this determines which temperature sensor is use to calculate
the Dewpoint. OAT can only be selected for units with DAT
control.
Mn Lvg Coil T is an adjustable item which is used to set the
minimum leaving coil temperature (Default = 45°F).
Min Reheat Spt is an adjustable item which is used to set the
minimum DAT during dehumidication.
Max Reheat Spt is an adjustable item which is used to set the
maximum DAT during dehumidication.
RH Sen Type is an adjustable item used to dene the eld
supplied humidity sensor input signal type.
RH Min Signal is an adjustable item used to dene the
minimum value of the eld supplied humidity sensor current or
voltage signal.
RH Max Signal is an adjustable item used to dene the
maximum value of the eld supplied humidity sensor current or
voltage signal.
Min Dehum Spd is an adjustable item used to set the
minimum supply fan variable speed supply air fan speed during
dehumidication.
Max Dehum Spd is an adjustable item used to set the
maximum supply fan variable speed supply air fan speed
during dehumidication.
Rht Min Pos is an adjustable item used to set the minimum
position of the reheat valve when the PI loop is active.
RH Dec Rate is an adjustable item used to set the rate of
decrease for the reheat valve, where the unit leaves the
dehumidication operation.
Item Display
Name
Default
Setting
Range
Password
Level
Dehum Method= None
None
4Rel Hum
DewPt
RH DB= 2% 0–10% 4
Dewpoint DB= 2°F 2–10°F 4
RH Period= 10s 0–999s 4
RH Gain= 1 0.0–100.0 4
RH PAT= 20s 0–999s 4
RH Max Chg= 16% 0–100% 4
Dehum Ctrl= Occupied
Occupied
4
Always
Sensor Loc= Return
Return
4Space
OAT
Mn Lvg Coil T= 45.0°F 40–100°F 4
Min Rheat Spt= 55.0°F 40.0–100.0°F 4
Max Rheat Spt= 65.0°F 40.0–100.0°F 4
RH Sens Type= VDC
VDC
2
mA
RH Min Signal= 0.0V
0.0–20.0
2
V/mA
RH Max Signal= 10.0V
0.0–20.0
2
V/mA
Min Dehum Spd= 33% 0–100% 2
Max Dehum Spd= 100% 0–100% 2
Rht Min Pos= 15% 0–100% 2
RH Dec Rate= 1.00 0–10.00%/s 2
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