3.1.1 Backlight (SW1)
BL ON: The screen is always backlit.
AUTO: The screen is backlit only when a button is pressed. The backlight remains on for 12 seconds.
3.1.2 Access Mode (SW2)
INST: Installer mode. Gives access to all configuration parameters.
NOTE: In this mode, the
USER: User mode. Gives access to configuration parameter 12 (humidity setpoint or humidity offset) only.
3.1.3 Keypad Lock (SW3)
I:The keypad is locked. Settings cannot be changed.
O:The keypad is unlocked.
3.2 Software Configuration
nPlace the controller in Installer mode (INST) using the SW2 selector switch on the back of the console.
oPress the Mode button for 3 seconds to access the configura- tion menu (see page 4). The first menu item (parameter) is dis- played.
pTo view another menu item, briefly press the Mode button.
The following table shows the order in which the parameters appear as well as a description of each parameter.
qTo modify a parameter, press either 
button. r To exit the configuration menu, press 
.
sReturn the controller to User mode (USER) using the SW2 selector switch.
4.Principles of Operation
4.1 Automatic Heating/Cooling Changeover
With automatic heating/cooling mode changeover, there’s no need to adjust the controller at every change of season or weather condi- tion. The controller switches automatically between heating mode and cooling mode to maintain the desired temperature. The mode changeover occurs as follows:
•The controller switches to cooling mode when the indoor tem- perature is higher than the setpoint by more than 1.5°C (2.5°F) for 15 minutes.
•The controller switches to heating mode when the indoor tem- perature is lower than the setpoint by more than 1.5°C (2.5°F) for 15 minutes.
4.2 Balance Points
Balance points are used to disable the heat pump operation or aux- iliary heating below or above a certain temperature.
•When the outdoor temperature is below the balance point low (bP L), the heat pump is disabled and only auxiliary heating can be used (see page 4, item 2).
•When the outdoor temperature is above the balance point high (bP H), the auxiliary heat is disabled (see page 4, item 3) and only the heat pump can be used.
NOTE: Balance points will not work if the
4.3 Heating During Defrost
The auxiliary heat is activated during defrost except under the fol- lowing conditions:
•When the outdoor temperature is above the defrost point (see page 4, item 4). NOTE: This condition will not apply if the
•When the plenum temperature is above 40°C (104°F). The auxiliary heat is
NOTE: The auxiliary heat’s
4.4 Types of Heat Pump Installations
The controller can be configured for either of the following types of heat pump installations (see page 4, item 5).
•
•New Installation: In this type of installation, as there is not already a furnace, the auxiliary heat source is installed at the same time as the heat pump. In this type of installation, the indoor coils are located upstream of the auxiliary heat. When the controller is configured for a new installation, the heat pump and the auxiliary heat can operate simultaneously.
4.5 “Smart Fan”
When “smart fan” is enabled (see page 4, item 7), the fan operates as follows:
•During the unoccupied mode (i.e., when you are away from home), the fan operates only when heating or cooling is acti- vated.
•The fan operates continuously the rest of the time.
NOTE: “Smart fan” is useful only when the fan is set to On (see sec- tion 5.2).
4.6 Interstage Delay
The interstage delay is the time that the temperature has to return to an acceptable value when it deviates too much from the setpoint. After this delay, auxiliary heating is activated. Auxiliary heating will be deactivated once the temperature returns to an acceptable value (see page 4, item 8).
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