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Table 20. Summary Of Dehumid Parameter Options
Control Parameter Control Value
Unit Description
P Screen Name
Short
Description
Min. Default Max.
105 DEHUMID MODE
Dehumidification
Mode
0
0 - No
Humiditrol
is installed
6 - All
Others
(Check unit
parameter
label)
7 Option
Dehumidification Mode
0- No reheat.
1- Supermarket reheat using De-Humidistat
(wired thermostat mode only)
2- Supermarket reheat using relative humidity
sensor.
3- Humiditrol reheat. Conditions: Blower must
be energized, Must be occupied, At least
one previous cooling demand.
4- Relative Humidity measurement / display.
No Supermarket or Humiditrol reheat.
5- Humiditrol reheat. Conditions: At least one
previous cooling demand.
6- Humiditrol reheat. Conditions: Blower must
be energized, Must be occupied.
7- Humiditrol reheat. Conditions: None
106 DEHUMID SETPOINT
Dehumidification
Set Point
0.0
Check unit
parameter
label as
default may
be altered
at factory
test.
100.0 % RH
Percent relative humidity where supermarket or
Humiditrol reheat demand is energized. Used with
dehumid mode option 2, 3, 5, 6 or 7.
Dehumidification is de-energized at set point –
dead-band (Parameter 107).
107 DEHUMID DEADBAND
Dehumidification
Deadband Set
Point
1.0 3.0 10.0 % RH
When Parameter 105 dehumidification options
2, 3, 5, 6 or 7 is set, then dehumidification is :
ON when relative humidity is equal to or
greater than Parameter 106.
OFF when Relative Humidity is less than
Parameter 106 minus Parameter 107.
To control humiditrol dehumidification by a digital output, the
user must enabled the Humiditrol option via the user inter
face:
SETUP > INSTALL
NOTE: Configuration ID 1, position 1 must be set to H.
Table 21. Outside Air For Dehumidification Parameters
Control Parameter Control Value
Unit Description
No. Screen Name Short Description Min. Default Max.
166 FAH REHEAT OAT SP
Fresh Air Heating Control Reheat
Outdoor Air Temperature Set
Point
20.0 45.0 60.0 °F
Outdoor air temperature set point
that enables fresh air heating for
reheat demand and opens
damper to Parameter 167 when
outdoor air is less than set point.
167 FAH REHEAT DAMPER
Fresh Air Heating Control Reheat
Damper Position
5.0 40.0 100.0 %
Fresh air damper position during
Fresh Air Heating reheat opera
tion.
168 FAH REHEAT SP Fresh Air Heat Control Set Point 40.0 40.0 70.0 °F
Fresh Air Heating Reheat set
point.
When Fresh Air Heat set
point (Parameter 156) is en
abled and outside air is being
used for dehumidification.
6.5. Selecting Minimum Low and Minimum High Damper Positions
The following tables reference minimum damper positions which have two possible values for units with MSAV blower
option, Parameter 9 = MIN DAMPER LOW BLWR or Parameter 132 = MIN DAMPER POSITION. Which minimum damper
position is used depends on a mid-point calculation and actual blower speed.
The mid-point speed is determined as (Min Cool CFM + Max Cool CFM)/2 from those available for the number of
compressors installed. Then if actual blower speed is < mid-point Parameter 9 is used, otherwise Parameter 132 used.
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