12
economical to run the backup heat rather than the heat pump.
The default and minimum value for this parameter is 12°F. Once
the outdoor temperature rises above this setpoint, the heat
pump will be permitted to operate again after the demand has
been satisfi ed and backup heat has shut off. (Determination
of the balance point is not simple and depends on a variety of
local factors, including the price of electricity and gas at any
particular time.)
To modify the value, perform the following:
1. From the Main Screen, press the or key to select
MENU at the bottom of the screen, then press the key
to see the Main Menu.
2. Use the or key to select SETTINGS, then press the
key to enter the Settings menu.
3. Use the or key to select OPTIONS, then press the
key to enter the Options screen.
O P T I O N S
P R O G R A M S C H E D U S A G E
6 0
O N
4 S C H E D E V E N T S / D A Y
D E H U M I D I F I C A T I O N
A U T O C H A N G E O V E R T I M E
S M A R T R E C O V E R Y
O F F
H E A T P U M P U S A G E L I M I T
M I N U T E S
N O T B E L O W
1 4 F
4. Use the or key to select the value under HEAT PUMP
USAGE LIMIT, then press the key to allow changing the
setting.
5. Use the or key to change the value (2°F increments),
then press the key to save the setting.
6. Press the key multiple times to return to the Main Screen.
Auto Changeover Time
This adjustment enables AUTO mode, which allows the system
to automatically switch between heating and cooling without
having to touch the controller. Autochangeover time is the delay
(minimum time) between the end of cooling operation and
the beginning of heating operation (or the reverse). DISABLE
removes AUTO as an available mode. Otherwise, the time may
be selected from 15 to 120 minutes (default 60 minutes).To
modify the value, perform the following:
1. From the Main Screen, press the or key to select
MENU at the bottom of the screen, then press the key
to see the Main Menu.
2. Use the or key to select SETTINGS, then press the
key to enter the Settings menu.
3. Use the or key to select OPTIONS, then press the
key to enter the Options screen.
4. Use the
or key to select the value under AUTO
CHANGEOVER TIME, then press the key to allow
changing the setting.
5. Use the or key to change the value, then press the
key to save the setting.
6. Press the key multiple times to return to the Main Screen.
Date and Time
Setting date and time early in the installation process not only
saves the homeowner from having to do it, but provides an
accurate time and date stamp for any faults logged (during
installation checkout, for example) in FAULT HISTORY. By
default, the clock is in 12 hour format. This may be changed
on the OPTIONS menu screen (see either of the above two
items). Daylight Saving Time is automatically taken into account
but may be disabled from the SET DATE AND TIME menu
screen.
To set date and time, perform the following:
1. From the Main Screen, press the or key to select
MENU at the bottom of the screen, then press the key
to see the Main Menu.
2. SET DATE AND TIME will be selected. Press the key
two times.
3. Enter the year, month, day (date), hour, and minute on
consecutive screens. Use the or key to change any
value, and press the key to advance to the next. After
setting the minutes value, press the key to save the
complete setting.
4. Press the key multiple times to return to the Main Screen.
Program Schedule versus Nonprogrammable.
While using “setback” program schedules are advisable to
take advantage of potential economic and energy savings,
some homeowners still prefer to perform setpoint adjustment
by exclusively using the and keys. The following setting
provides the nonprogrammable option or the option for different
numbers of events per day (2 or 4) on the program schedule.
To set the program schedule option, perform the following:
1. From the Main Screen, press the or key to select
MENU at the bottom of the screen, then press the key
to see the Main Menu.
2. Use the or key to select SETTINGS, then press the
key to enter the Settings menu.
3. Use the or key to select OPTIONS, then press the
key to enter the Options screen.
4. The value under PROGRAM SCHED USAGE will be
selected. Press the key to allow changing the setting.
5. Use the or key to change the value between “NON
PROGRAMMABLE”, “4 SCHED EVENTS/DAY”, “2 SCHED
EVENTS/DAY”, and “2 EVENTS/D BUSINESS”. Then press
the key to save the setting. (The difference between “2
EVENTS/D BUSINESS” and “2 SCHED EVENTS/DAY”
is only the name given to the time blocks within a daily
schedule.)
6. Press the key multiple times to return to the Main Screen.
Dehumidifi cation
When dehumidifi cation is enabled (as it is by default),
the system will (depending upon the conditions) suspend
responding to room temperature and lower blower speed to
enhance removal of moisture from the air circulating through
the indoor coil. When operating in this manner, the unit will
run cycles of 10 minutes dehumidifying, 5 minutes normal
cooling (adjusting capacity). See also setting the humidity
setpoints in (6) below. To change the dehumidifi cation option,
perform the following: