505232 06/07
Page 8
Dew Point Control
NOTE − Dew point control is only available when an outdoor sensor is at-
tached.
Select ADJ from the HUMIDIFY MENU. Dew point adjustment will change
the humidification setpoint based on the outdoor temperature and a user−
defined dew point adjustment setting.
NOTE − In dew point adjustment mode, the humidification setpoint has no
effect whatsoever on unit operation. Only the user−defined dew point ad-
justment setting affects operation per the following:
Formula:
RH
setpoint
=
Outdoor Temp
2
+ 25 +
RH
user
dew
point
adjustment
Where: RH
user
dew
point
adjustment
cannot exceed +/−15% and
RH
setpoint
minimum is 15% and cannot exceed 45%.
Turn on and Adjust Dew Point Control
The dew point adjustment control may be adjusted in 1 percent increments;
relative humidity range. To locate the DEW POINT ADJ CONTROL screen:
1. From the home screen press
MENU. From the main menu
screen select HUMIDIFY. Press
SELECT.
2. Use the up or down button to high-
light MODE. Press SELECT.
3. To turn on the dew point control in
either basic or precision mode,
use the up or down button to high-
light BASIC/DP or PRECISION/
DP. Press SELECT to choose the
mode you want to set.
4. The HUMIDIFY MENU screen re-
appears, this time with an addi-
tional option, DEW POINT ADJ.
5. Use the UP/DOWN button to
highlight DEW POINT ADJ; press
SELECT. Limits: Min. −15%, Max.
+15%. Default setting: 0%.
6. In the DEW POINT ADJ CON-
TROL screen, use UP/DOWN
buttons to adjust desired dew
point limit. When you reach the
desired level, press SELECT.
Dehumidification
Dehumidification is provided only when the thermostat is in cool mode. The
dehumidification signal (D terminal) is used to reduce the speed of the in-
door blower during dehumidification. It does this by de−energizing the D ter-
minal (terminal is an open circuit). Otherwise, the D terminal is activated
with 24VAC. This is always the case when the thermostat is in HEAT or
OFF mode.
The D terminal controls dehumidification. When the thermostat is powered,
the D terminal is always active (24V present) in HEAT and OFF modes and
is also active in the COOL mode EXCEPT when there is a call for dehumidi-
fication. When a dehumidification demand is present, the D terminal is de−
energized (open circuit), and the Y1 terminal becomes activated with
24VAC. Y2 (if available) also becomes activated with 24VAC.
The default mode for dehumidification is OFF and needs to be activated
during installation. When dehumidification is occurring, a small teardrop
icon with a −" symbol inside (shown in margin) is displayed on the screen.
MAIN MENU
PROGRAM
HEAT / COOL ⏐
HUMIDIFY ↓
DEHUMIDIFY
HOME SELECT
HUMIDIFY MENU
MODE OFF
HUMIDIFY 44%
MAIN MENU SELECT
HUMIDIFY MODE
BASIC
PRECISION ↑
BASIC/DP ⏐
PRECISION/DP
HUM MENU SELECT
HUMIDIFY MENU
MODE BAS/DP
DEW POINT ADJ 10%
MAIN MENU SELECT
HUMIDIFY MENU
MODE BAS/DP
DEW POINT ADJ 0%
MAIN MENU SELECT
DEW POINT ADJ
CONTROL
↑
↓
HUM MENU SELECT
%
10
−
To Next Page
Loading...
Need help?
General
