Table2---Equipment Outputs
Cool---0 to 2 minutes Y1, G
Cool--2 to 4 minutes Y1, Y2, G
Heat---0 to 2 minutes Wl Wl
Heat--2 to 4 minutes Wl, W2 Wl, W2
EHeat--0 to 2 minutes
EHeat--2 to 4 minutes
2 stage heat not available.
NOTE: For Y use terminal Y/Y2. for Y1 use terminal YliW2. for W2_tse terminal O/W2
For O use terminal O/W2, for Wl use terminal W/W1, for W2_ use terminal Y1/W2.
HUMIDIFICATION
The Thermidistat Control directly connects to a standard 24vac
humidifier to control humidification in the home. A humidify set
point between 10 and 45% relative humidity is selected by the
homeowner, or all humidification can be turned off. When
humidity in home drops below set point, humidifier will be
turned on to raise humidity level. Humidification can only occur
in heating mode (HEAT or AUTO/HEAT). Five different
humidification selections are available and are described below.
Table 3--Energy Star Default Schedule
Schedule Heat Cool
Wake 6:00 AM 68 ° F 78 ° F
Day 8:00 AM 60 ° F 85 ° F
Evening 5:00 PM 68 ° F 78 ° F
Sleep 10:00 PM 60°F 85°F
1. Normal Humidify
In normal humidify, humidifier will be on if there is a humidity
demand and any heating equipment is on. This will include
furnace, heat pump, or auxiliary heat. In heat pump applications,
this is an improvement over using an external humidistat, which
only supplies humidity when auxiliary heat is on.
2. Fan Humidify
This configuration allows a humidify demand to turn on fan and
humidifier together, even if there is no heat demand. It is
particularly useful when the furnace is oversized, resulting in
short heating cycles. It allows the humidifier to run longer,
supplying more humidity to the home. Note that fan hours will
increase, using more electricity. Also, the humidifier delivers less
nmisture to cooler air than it does to heated air.
3. Auto Humidify
This feature is designed to eliminate the problem of sweating
windows in very cold weather. When selected, the set point is
automatically reduced by 1% for every drop of 2°F in outdoor
1-Stage A/C 2-Stage A/C 1-Stage HP 2-Stage HP
Y,G Y,G,O Y1,G,O
Y,G Y,G,O Y1,Y2 G, O
Y,G Y1,G
Y, G Y1, Y2, G
W1 W1
WI, W2t WI*
temperature between 50 =_F and 0 °F. The set point may be
changed at any time, and it will continue to track outdoor
temperature from the new set point and current outdoor
temperature. The adjusted set point range is still limited to
between 10 and 45% relative humidity. To use this feature, an
outdoor temperature sensor MUST be attached. If not, E3 error
message will be displayed.
4. Auto and Fan Humidify
The 2 choices of AUTO and FAN can be selected together. This
provides both functions simultaneously.
5. Humidify Off
The humidify function can be turned off completely. This does
not require changing existing set points.
To Select Humidification (Between NORMAL, FAN, AUTO,
FAN and AUTO, or OFF) (See Table 4.)
Press HUMIDITY button to bring up humidity select screen. It is
indicated by "hu" or "dhu" in clock display. Successive presses
will change between "hu" and "dhu" in clock display. Select "hu"
for humidity functions. The large display shows actual humidity
level. The smaller display (in heat set point location) shows
humidity set point (Humidify Set Point) or OF (off). When
Humidity Set Point value is displayed, its value can be changed
with up and down buttons. Successive presses of MODE button
will move between 5 choices described above and each will be
indicated as shown in Table 4.
To exit humidity select screen, press END button.
Additional Humidify Comments
The humklifier is actually turned on when humidity is 2% below
set point and turned off when it reaches 2% above set point. This
built-in hysteresis prevents humidify output from toggling on
and off when humidity level is near set point.
The vacation mode provides some additional humidification
functions. These are specially designed to provide protection for
an unoccupied home while simultaneously minimizing energy
use. Refer to "Vacation" section for additional information.
Table 4_Humidification Selections
Selection Mode Display Fan Display Humidify Set Point Display
Normal Humidify Blank Blank Humidify Set Point Value
Fan Humidify Blank FAN Humidify Set Point Value
Auto Humidify AUTO Blank Humidify Set Point Value
Auto and Fan AUTO FAN Humidify Set Point Value
Humidify Off Blank Blank OF (Off)
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