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How De-Humidification Mode Works
Remember that the humidification only operates while in the heat
ing mode and De-humidification only operates while in the cooling
mode.
OFF, MEDIUM AND HIGH—These modes allow user control of
relative humidity between 40% and 60% RH. These conditions
must be met for either mode to operate:
S
de-humidification mode has been enabled, and
S
the unit is in COOL mode, and
S
de-humidification demand exists (0V present at H), and
MEDIUM mode also requires presence of cooling demand [Y for
HP heat, or W for gas heat (W may be energized with G de-ener
gized)].
®
Humiditrol
or Auxiliary Dehumidifier mode requires:
NOTE - Systems using icomfortt and a dehumidifier - "Dehum"
jumper on furnace/air handler control does not need to be cut when
®
using with a iComfort Wi-Fi
S
Wi-Fi is operational or outdoor sensor is installed and set up
S
De-humidification has been enabled on installer settings, and
S
the unit is in COOL mode, (or if in AUTO, at least one thermo
stat cooling call made prior to the De-humidification demand),
and
S
a De-humidification demand exists (RH above set point), and
S
outdoor temp. below 95°F; indoor temp. above 65°F, and
S
for HUMIDITROL, adjust Humiditrol
follows:
MAX adj. - Indoor temp > 2°F above heating set point
MID adj. - Indoor temp >
MIN adj. - Indoor temp > 2°F below cooling set point
ADJUSTING HUMIDIFICATION AND DE-HUMIDIFICATION SETTINGS WITH COMMUNICATING OUTDOOR UNITS
HUMIDIFICATION SETTINGS (SYSTEM DEVICES):
System Devices
System
Air Conditioner
Furnace
1a
Thermostat
Power (120VAC) Humidifier
System
2nd Stage Differential
Staged Delay Timers
2nd Stage Delay
De-humidification Control Mo
De-humidification
Control Mode
Humidification Control Mode
Select one
Display Only
Basic
3a
Precision
Basic Dew Point Control
Precision Dew Point
3b
save
cancel
®
iComfort Wi-Fi
thermostat.
®
comfort parameters as
HEAT setpoint + COOL setpoint
2
To adjust a setting, highlight it,
then press Edit
System
about
1b
edit
Humidification Control Mode
resetAll
current value:
back
next
edit
Basic
2a
2b
reset
back
Figure 14. Adjust a Communicating Device Setting — Humidification
AUXILIARY DEHUMIDIFIER
When this option is selected, De-humidification will be allowed under the following
conditions, provided there is NO call for humidification:
S
In the absence of heating or cooling calls, or
S
Simultaneous with blower only calls.
If the blower is required to operate while the auxiliary dehumidifier is running, a
separate wire must be installed from the auxiliary dehumidifier to the indoor unit's G
thermostat input that will energize G when the auxiliary dehumidifier is running (see
wiring diagram on page 37).
Auxiliary De-humidification is controlled by the thermostat De-humidification
demand.
NOTE - Refer to HCWH Dehumidifier Installation Instructions for installation
recommendations.
DE-HUMIDIFICATION (NO EXTERNAL DE-HUMIDIFICATION DEVICE)
NOTE - OFF, MEDIUM and HIGH De-humidification modes are also a function of the
HVAC system with NO external De-humidification devices installed.
In OFF mode, De-humidification if off.
In MEDIUM mode, De-humidification occurs if these conditions are met and signals are
present at specific terminals:
S
De-humidification has been enabled on installer settings, and
S
the unit is in COOL mode, and
S
De-humidification demand exists (RH above set point), and
S
cooling demand exists (Y1 energized).
In HIGH mode, De-humidification occurs if all BASIC conditions are true, except cooling
demand may or may not be present. Also note that:
S
Maximum overcool from cooling set point is 2ºF.
S
Deadband temperature is limited to a minimum of 5ºF (instead of 3ºF in
MODERATE or DISPLAY ONLY mode) because of 2ºF overcooling.
Pre-adjustment REQUIREMENTS:
1st, the device has been installed (see page 5).
2nd, you pressed next at the "Add or Remove..." screen (see page 5).
Configure the device as follows:
1.In the "system devices" list, use the arrows (1a) to highlight System. Press edit (1b).
2.In the "System" list, use the arrows (2a) to highlight Humidification Control Mode. The
current value defaults to Basic mode. Press edit (2b).
3.Touch one of the radio buttons (3a) to select the mode of humidification control; press
save (3b). (After saving, check that the current value now shows the new selection).
4.Press the back button to return to "Adjust a setting..." screen.
NOTE - If the defaults for the settings shown in red, you are not required to make any changes,
but you must go into the edit tool, and press save (5b). When all red text is gone, the back button
will appear; press it to return to the "Adjust a setting..." screen.
7-Day Programmable Communicating Thermostat
Page 13
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