OPTION 14—HEAT/COOL DEAD BAND ADJUSTMENT
This option selects the minimum difference between heat and cool
set points. A larger difference saves energy and a smaller differ-
ence decreases temperature difference between heating and cool-
ing. Factory default is 2, which means cooling set point must be a
minimum of 2° above heating set point. An attempt to move them
closer will result in one "pushing" the other to maintain the
required difference.
Depending on set points, moving dead band closer than 2° may
result in regular cycling between heat and cool when AUTO mode
is selected. However, this cycling cannot occur more often than 1
transition every 20 minutes. The system has a built-in requirement
that it cannot switch between heat and cool without a 20 minute
"off" time between the 2 operations. Specifically, to switch from 1
mode to the other, there must be no demand for the old mode and
a demand for the new mode, and this must exist continually for 20
minutes before transition to the new mode will occur.
TO SELECT:
1. Enter configuration mode if not already there. See Step 4
"To enter Configuration Mode." Use up and down buttons
to make small (now flashing) display indicate 14.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to move between 0, 1, 2, 3, 4, 5, or
6 on large display. Factory default is 2.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
OPTION 15—ENABLE AUTO MODE
This option allows the installer to enable or disable AUTO mode
(automatic changeover between heat and cool). When disabled,
AUTO icon does not appear when successive presses of MODE
button are used to move between OFF, HEAT, COOL, and
EHEAT (in heat pump systems). Factory default is ON (AUTO
enabled).
TO SELECT:
1. Enter configuration mode if not already there. See Step 4
"To Enter Configuration Mode." Use up and down buttons
to make small (now flashing) display indicate 15.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up and down buttons to move between OF and ON on
large display. Factory default is ON (AUTO enabled).
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
OPTION 16—RESERVED FOR FUTURE USE
OPTION 17—ENABLE NON-PROGRAMMABLE OPERA-
TION
This option converts the programmable Thermidistat Control to a
non-programmable control for those users who do not want
programmability. The clock is retained, but the days of the week
and the daily schedules have been eliminated, making it operate as
if HOLD were permanently ON. Some of the buttons (used in
programming only and now not needed) are redefined to simplify
the non-programmable operation. To match these redefined but-
tons, a new keypad label, included with the Thermidistat, must be
placed over the original keypad label. Fig. 2 shows both the
original keypad label and the non-programmable keypad label.
When this option is selected, the new keypad label must be applied
over (or in place of) the original. Because these adhesive-backed
keypad labels are not designed to be removed, this conversion
should be considered permanent. Once the change to non-
programmable operation is done, a procedure is not provided to
easily change it back. Should this change be needed, it is best to
trade the Thermidistat for one which has not been converted.
Both programmable and non-programmable versions of the Ho-
meowner’s Manual are available.
Once it has been determined that a particular installation is to be
made non-programmable, the only changes required are:
•
Attach non-programmable keypad label over original program-
mable one.
•
Set Configuration Option No. 17 to ON.
To attach the provided non-programmable keypad label, carefully
peel off its backing and apply it over the original keypad label.
PLEASE HEED: Once the new keypad label makes contact, it will
stick firmly in place and adjustments cannot be made. CARE-
FULLY locate an edge of the keypad label, making sure its
position and orientation are correct. Then, from the attached edge,
smooth the rest of the keypad label over the original. Make sure the
new keypad label does not interfere with the motion of the buttons
which it surrounds.
TO SELECT:
1. Enter configuration mode if not already there. See Step 4
"To Enter Configuration Mode." Use up and down buttons
to make small (now flashing) display indicate 17.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up and down buttons to move between OF and ON on
large display. Factory default is OF.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
E.
Redefinition of Buttons
Fig. 2 shows the original (programmable) button labels on the left
and the redefined (non-programmable) buttons on the right. In the
figure, the buttons are numbered for easy reference. They are not
numbered on the actual product. Six of the buttons (numbers 1
through 5 and 9) have been redefined.
Button 3 originally alternated between time, cool set point, and
heat set point with each press. Now, button 1 selects the cool set
point, button 2 selects the heat set point, and button 3 selects time,
now used only to set the clock. Note that the days of the week are
gone.
Button 5 used to alternate between humidify and dehumidify. Now
button 4 selects dehumidify and button 5 selects humidify.
Button 9 now loses the HOLD label, making it END only. This
button is only used to END the humidity screen and the configu-
ration mode.
These changes both simplify operation for the homeowner and find
use for the buttons which are no longer needed when programma-
bility is removed.
V.
SYSTEM START-UP AND CHECKOUT
The Thermidistat Control is designed with a built-in installer test
capability. It allows easy operation of equipment without delays or
set point adjustments to force heating or cooling.
To enable installer test mode, move DIP switch No. 4 to ON
position. To access this switch, open case as described in Step 2.
Use the corner of a small screwdriver to slide switch No. 4 to ON
position.
While in installer setup mode, clock will display "InSt," FAN
button will control fan, and MODE button will control heating and
cooling.
A.
To Test Fan:
F,an button switches FAN icon between AUTO and ON. While
ON is displayed, G output will be on, turning fan on. Allow up to
10 sec after button is pressed for fan to turn on and off. On some
fan coils, fan continues to operate for 90 sec after G signal is
removed.
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